Tektronix DMM4040, DMM4050 Programmer

DMM4040 and DMM4050

Digital Multimeter

077-0363-00

Programmer Manual

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix, Inc.

Tektronix, Inc. 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA

For product information, sales, service, and technical support:

- In North America, call 1-800-833-9200.

- Worldwide, visit www.tektronix.com

to find contacts in your area.

Title Page

Introduction....................................................................................................... 4

Safety Information............................................................................................. 4

Symbols and Terms....................................................................................... 5

Safety and Electrical Symbols ...................................................................... 5

Local and Remote Operation........................................................................ 5

Computer Interfaces...................................................................................... 6

Optimizing System Speed for I/O Operation .................................................... 6

Selecting the Remote Interface Port.................................................................. 8

Configuring the IEEE-488 Port......................................................................... 8

IEEE-488 Operating Limitations .................................................................. 8

Setting the IEEE-488 (GPIB) Port Address.................................................. 8

Capability Commands................................................................................... 9

Interconnections............................................................................................ 9

Configuring the RS-232 Port............................................................................. 10

Setting RS-232 Baud Rate............................................................................ 10

Setting RS-232 Parity and Data Bits............................................................. 11

Setting RS-232 Stop Bits.............................................................................. 11

Setting RS-232 Flow Control........................................................................ 11

Setting RS-232 End-Of-Line Character........................................................ 11

Enabling and Disabling Fluke 45 Emulation Echo....................................... 11

RS-232 Modes of Operation......................................................................... 12

Interconnections............................................................................................ 14

Configuring the Ethernet (LAN) Port ............................................................... 16

Setting the IP Address................................................................................... 16

Setting the LAN Subnet Mask...................................................................... 17

Reading the Domain Name........................................................................... 18

Configuring the Host Name.......................................................................... 18

Reading the MAC Address........................................................................... 18

Configuring the LAN Default Gateway........................................................ 18

Configuring the General Network Socket Port............................................. 19

Establishing an Ethernet Connection ................................................................ 19

Terminating an Ethernet Connection ................................................................ 21

Selecting the Programming Language .............................................................. 21

Getting Started With an Installation Test.......................................................... 21

Installation Test for RS-232 Connections..................................................... 21

Installation Test for IEEE-488 Connections................................................. 22

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Programmer Manual

If the Test Fails ............................................................................................. 22

How the Meter Processes Input......................................................................... 23

Input Strings.................................................................................................. 23

Input Terminators.......................................................................................... 23

Typical IEEE-488 Input Strings.................................................................... 24

Sending Numeric Values to the Meter.......................................................... 24

Sending Command Strings to the Meter....................................................... 24

How the Meter Processes Output...................................................................... 25

Triggering Input ................................................................................................ 26

Internal Triggering........................................................................................ 26

External Triggering....................................................................................... 27

Service Requests (IEEE-488 Only) and Status Registers.................................. 27

Standard Event Status and Standard Event Status Enable Registers ............ 28

Questionable Data Event Register and Questionable Data Enable Register. 29

Status Byte Register...................................................................................... 30

Reading the Status Byte Register.................................................................. 30

Service Request Enable Register .................................................................. 31

Supported SCPI Commands.............................................................................. 31

SCPI Command Summary............................................................................ 32

SCPI Command Details................................................................................ 41

Using the MEASure? Command .................................................................. 42

Using the CONFigure Command.................................................................. 43

Using the READ? Command........................................................................ 46

Using the INITiate Command....................................................................... 46

Using the FETCh? Command....................................................................... 46

Using the SENSe Subsystem to Configure the Meter................................... 47

Programming for Math Operations............................................................... 55

Programming the Trigger System................................................................. 59

Using System-Related Commands................................................................ 63

Using Status Reporting Commands.............................................................. 66

Calibration Commands ................................................................................. 68

Using RS-232/Ethernet Interface Commands............................................... 70

Command Terminators ................................................................................. 71

Alternate Programming Language Compatibility......................................... 72

FLUKE 45 Command Emulation Summary..................................................... 73

Computer Interface Command Set................................................................ 73

IEEE-488 Capabilities and Common Commands......................................... 73

Triggering Output ......................................................................................... 80

Using NI SignalExpress, Tektronix Edition...................................................... 81

FLUKE 8842A Emulation Mode...................................................................... 81

Example Notes.............................................................................................. 81

Device-Dependent Command Set................................................................. 84

Input Syntax.................................................................................................. 92

Output Data................................................................................................... 94

Service Requests........................................................................................... 96

Introduction....................................................................................................... 99

Introduction....................................................................................................... 107

Incompatible Fluke 45 Commands.................................................................... 107

Dual Functions.............................................................................................. 107

Reading Rates ............................................................................................... 108

Ranges........................................................................................................... 108

Introduction....................................................................................................... 109

Your Meter and Your Network Administrator.................................................. 109

Network Primer................................................................................................. 110

Physical Layer Wiring Schemes Supported by the Meter ............................ 110

Contents (continued)

Network Interconnection Devices................................................................. 111

Basic Network Packet and Frame Contents.................................................. 111

IP Addresses and Segmented Networks........................................................ 112

TCP/IP Protocol Stack.................................................................................. 114

Introduction....................................................................................................... 117

Device Dependent Command Set...................................................................... 117

Calibration Commands...................................................................................... 117

Dn (Display Commands)................................................................................... 118

Gn (Get Commands) ......................................................................................... 118

Tn (Trigger Mode Commands)......................................................................... 118

Wn (Terminator Commands)............................................................................ 118

Numeric Entry Command ................................................................................. 118

Talk-Only Mode................................................................................................ 118

Ranging in 8842A Emulation Mode ................................................................. 118

Operational Differences .................................................................................... 119

Index

Appendices

A Error Codes................................................................................................ 95

B Fluke 45 Emulation Limitations ................................................................. 103

C Network Consideration............................................................................... 105

D Fluke 8842A Emulation Limitations .......................................................... 113

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List of Tables

Table Title Page

1. IEEE-488 Compatibility Codes............................................................................. 9

2. Factory Settings of RS-232 Communications Parameters..................................... 10

3. Status Register Summary....................................................................................... 27

4. Description of Bits in ESR and ESE...................................................................... 28

5. Description of Bits in the Questionable Data Register.......................................... 29

6. Description of Bits in the Status Byte Register ..................................................... 30

7. CALibration Command Summary......................................................................... 32

8. CONFigure Command Summary.......................................................................... 32

9. IEEE-488.2 Common Command Summary.......................................................... 33

10. Math Command Summary..................................................................................... 33

11. MEASure Command Summary............................................................................. 34

12. Measurement configuration command summary .................................................. 35

13. RS-232 Interface Command Summary.................................................................. 38

14. Status Reporting Command Summary .................................................................. 39

15. System-Related Command Summary.................................................................... 40

16. Triggering Command Summary............................................................................ 41

17. Preset Conditions for the MEASure? and CONFigure Commands....................... 45

18. Allowed Math/Measurement Function Combinations........................................... 55

19. IEEE-488.2 Common Commands......................................................................... 73

20. Fluke 45 Function Commands and Queries........................................................... 75

21. Function Modifier Commands and Queries .......................................................... 76

22. Range and Measurement Rate Commands and Querie ......................................... 77

23. Measurement Queries............................................................................................ 78

24. Compare Commands and Queries......................................................................... 79

25. Trigger Configuration Commands......................................................................... 79

26. Miscellaneous Commands and Queries................................................................. 80

27. RS-232 Remote/Local Configuration Commands................................................. 80

28. Trigger Types ........................................................................................................ 81

29. 8842A Get Commands .......................................................................................... 86

30. Serial Poll Register................................................................................................ 97

31. Serial Poll Register Description............................................................................. 97

32. Execution Error Codes and Descriptions............................................................... 99

33. Ethernet/ IEEE-488 Configuration Errors ............................................................. 104

34. Calibration Errors .................................................................................................. 104

35. Non-compatible Fluke 45 Remote Commands...................................................... 107

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Programmer Manual

36. Fluke 45 Dual Function Compatibility Matrix...................................................... 108

37. IP Address Assignments........................................................................................ 112

38. 8842A Device Dependent Commands Not Supported .......................................... 117

39. DMM4040/4050 Commands the Fluke 8842A Doesn't Support........................... 117

40. Fluke 8842A Virtual Range Mapping ................................................................... 119

List of Figures

Figure Title Page

1. RS-232 Pin-out and Cable Interconnect................................................................ 15

2. Typical IEEE-488 Input String.............................................................................. 25

3. Overview of Status Data Structure (DMM4040/4050 and Fluke 45).................... 28

4. DMM4040/4050 Triggering System ..................................................................... 60

5. Typical Command String for Fluke 8842A Emulation ......................................... 82

6. Fluke 8842A Emulation Device-Dependent Command Set.................................. 83

7. Fluke 8842A Emulation Data Output Format........................................................ 85

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viii

Remote Operation

Introduction..........................................................................................................0-4

Safety Information................................................................................................0-4

Symbols and Terms ..........................................................................................0-5

Safety and Electrical Symbols .........................................................................0-5

Local and Remote Operation................................................................................0-5

Computer Interfaces.............................................................................................0-6

Optimizing System Speed for I/O Operation .......................................................0-6

Selecting the Remote Interface Port.....................................................................0-8

Configuring the IEEE-488 Port............................................................................0-8

IEEE-488 Operating Limitations..........................................................................0-8

Setting the IEEE-488 (GPIB) Port Address .........................................................0-8

Capability Commands..........................................................................................0-9

Interconnections...................................................................................................0-9

Configuring the RS-232 Port................................................................................0-10

Setting RS-232 Baud Rate....................................................................................0-10

Setting RS-232 Parity and Data Bits....................................................................0-11

Setting RS-232 Stop Bits......................................................................................0-11

Setting RS-232 Flow Control...............................................................................0-11

Setting RS-232 End-Of-Line Character...............................................................0-11

Enabling and Disabling Fluke 45 Emulation Echo ..............................................0-11

RS-232 Modes of Operation ................................................................................0-12

DMM4040/4050 Mode ........................................................................................0-12

Selecting Between Computer and Terminal Mode ..............................................0-12

Fluke 45 Mode .....................................................................................................0-12

Interconnections...................................................................................................0-14

Fluke 8842A Emulation Mode.............................................................................0-14

DMM4040/4050

Programmer Manual

Configuring the Ethernet (LAN) Port Error! Bookmark not defined.-Error! Bookmark not defined.

Setting the IP Address..........................................................................................0-16

Selecting Dynamic Host Configuration Protocol (DHCP)...................................0-16

Setting a Static Internet Address ..........................................................................0-17

Setting the LAN Subnet Mask..............................................................................0-17

Reading the Domain Name..................................................................................0-18

Configuring the Host Name .................................................................................0-18

Reading the MAC Address ..................................................................................0-18

Configuring the LAN Default Gateway...............................................................0-18

Configuring the General Network Socket Port ....................................................0-19

Establishing an Ethernet Connection ...................................................................0-19

Terminating an Ethernet Connection ...................................................................0-21

Selecting the Programming Language .................................................................0-21

Getting Started With an Installation Test.............................................................0-21

Installation Test for RS-232 Connections ............................................................0-21

Installation Test for IEEE-488 Connections ........................................................0-22

If the Test Fails.....................................................................................................0-22

How the Meter Processes Input............................................................................0-23

Input Strings.........................................................................................................0-23

Input Terminators.................................................................................................0-23

Typical IEEE-488 Input Strings...........................................................................0-24

Sending Numeric Values to the Meter.................................................................0-24

Sending Command Strings to the Meter ..............................................................0-24

How the Meter Processes Output.........................................................................0-25

Triggering Input ...................................................................................................0-26

Internal Triggering ...............................................................................................0-26

External Triggering..............................................................................................0-27

Service Requests (IEEE-488 Only) and Status Registers.....................................0-27

Standard Event Status and Standard Event Status Enable Registers....................0-28

Questionable Data Event Register and Questionable Data Enable Register........0-29

Status Byte Register.............................................................................................0-30

Reading the Status Byte Register.........................................................................0-30

Service Request Enable Register..........................................................................0-31

Supported SCPI Commands.................................................................................0-31

SCPI Command Summary ...................................................................................0-32

SCPI Command Details .......................................................................................0-41

Using the MEASure? Command..........................................................................0-42

Using the CONFigure Command.........................................................................0-43

Setting Range and Resolution Parameters............................................................0-46

Using the READ? Command...............................................................................0-46

Using the INITiate Command..............................................................................0-46

Using the FETCh? Command..............................................................................0-46

Using the SENSe Subsystem to Configure the Meter..........................................0-47

Programming for Math Operations ......................................................................0-55

Programming the Trigger System ........................................................................0-59

Using the Triggering Commands .........................................................................0-60

Using System-Related Commands.......................................................................0-63

Using Status Reporting Commands .....................................................................0-66

Calibration Commands.........................................................................................0-68

Using RS-232/Ethernet Interface Commands......................................................0-70

Command Terminators.........................................................................................0-71

SCPI Parameter Types .........................................................................................0-71

Numeric Parameters.............................................................................................0-71

Discrete Parameters..............................................................................................0-72

Digital Multimeter

Introduction

Boolean Parameters..............................................................................................0-72

String Parameters .................................................................................................0-72

Alternate Programming Language Compatibility................................................0-72

FLUKE 45 Command Emulation Summary........................................................0-73

Computer Interface Command Set.......................................................................0-73

IEEE-488 Capabilities and Common Commands................................................0-73

Function Commands and Queries ........................................................................0-75

Function Modifier Commands and Queries.........................................................0-76

Range and Measurement Rate Commands and Queries.......................................0-77

Measurement Queries...........................................................................................0-78

Compare Commands and Queries........................................................................0-79

Trigger Configuration Commands .......................................................................0-79

Miscellaneous Commands and Queries ...............................................................0-80

RS-232 Remote/Local Configurations.................................................................0-80

Triggering Output.................................................................................................0-80

Setting the Trigger Type Configuration...............................................................0-80

External Triggering..............................................................................................0-81

Using NI SignalExpress, Tektronix Edition.........................................................0-81

FLUKE 8842A Emulation Mode.........................................................................0-81

Example Notes .....................................................................................................0-81

Device-Dependent Command Set........................................................................0-84

Bn (Offset Commands) ........................................................................................0-84

Dn (Display Commands)......................................................................................0-84

Fn (Function Commands).....................................................................................0-84

Get Commands.....................................................................................................0-84

G0 (Get Instrument Configuration)......................................................................0-86

G1 (Get SRQ Mask).............................................................................................0-87

G3 (Get User-Defined Message)..........................................................................0-87

G4 (Get Calibration Status)..................................................................................0-87

G5 (Get IAB Status).............................................................................................0-87

G6 (Get YW Status).............................................................................................0-88

G7 (Get Error Status) ...........................................................................................0-88

G8 (Get Instrument Identification).......................................................................0-88

N (Numeric Entry Command)..............................................................................0-89

Put Commands .....................................................................................................0-89

P0 (Put Instrument Configuration).......................................................................0-89

P1 (Put SRQ Mask)..............................................................................................0-90

Rn (Range Commands)........................................................................................0-90

Sn (Reading Rate Commands).............................................................................0-90

Tn (Trigger Mode Commands)............................................................................0-90

Wn (Terminator Commands) ...............................................................................0-91

X0 (Clear Error Register Command) ...................................................................0-91

Yn (Suffix Commands)........................................................................................0-91

Z0 (Self-Test Command) .....................................................................................0-91

Device Clear Command .......................................................................................0-91

? (Single-Trigger Command) ...............................................................................0-92

Input Syntax .........................................................................................................0-92

Definitions 0-92

Input Processing...................................................................................................0-92

Syntax Rules 0-93

Output Data..........................................................................................................0-94

Loading Output Data............................................................................................0-94

Types of Output Data...........................................................................................0-95

Numeric Data and Error Messages.......................................................................0-95

Overrange Indication............................................................................................0-95

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Programmer Manual

Error Messages.....................................................................................................0-95

Status Data 0-96

Output Priority......................................................................................................0-96

Service Requests ..................................................................................................0-96

The SRQ Mask.....................................................................................................0-98

Introduction..........................................................................................................A-99

Introduction..........................................................................................................B-107

Incompatible Fluke 45 Commands.......................................................................B-107

Dual Functions .....................................................................................................2-107

Reading Rates.......................................................................................................2-108

Ranges 2-108

Introduction..........................................................................................................C-109

Your Meter and Your Network Administrator.....................................................C-109

Network Primer....................................................................................................C-110

Physical Layer Wiring Schemes Supported by the Meter....................................C-110

Network Interconnection Devices........................................................................C-111

Basic Network Packet and Frame Contents .........................................................C-111

IP Addresses and Segmented Networks ...............................................................C-112

TCP/IP Protocol Stack .........................................................................................3-114

Introduction..........................................................................................................D-117

Device Dependent Command Set.........................................................................D-117

Calibration Commands.........................................................................................4-117

Dn (Display Commands)......................................................................................4-118

Gn (Get Commands) ............................................................................................4-118

Tn (Trigger Mode Commands)............................................................................4-118

Wn (Terminator Commands)...............................................................................4-118

Numeric Entry Command ....................................................................................4-118

Talk-Only Mode...................................................................................................4-118

Ranging in 8842A Emulation Mode ....................................................................4-118

Operational Differences .......................................................................................4-119

Introduction

Remote operation of the DMM4040 or 4050 Digital Multimeter (hereafter “the Meter”) from a host, that is, a terminal, controller, PC, or computer, is accomplished by sending commands to it through one of its remote interfaces. This manual describes how to setup, configure, and operate the Meter through each of the remote interfaces.

The Meter is controlled remotely using either Standard Commands for Programmable Instruments (SCPI), Fluke 45 or Fluke 8842A (8840A and 8842A) commands. Detailed information on the SCPI command set, and how the Meter processes those commands is included in this manual. Fluke 45 command limitations are covered in Appendix B and Fluke 8842A command limitations are covered in Appendix D in this manual.

For more information regarding the SCPI programming language, visit http://www.scpiconsortium.org found at http://www.scpiconsortium.org/SCPI-99.pdf.

The level of detail in this chapter is based on the assumption that the reader is familiar with the basics of data communication interface, and the IEEE-488 bus.

Safety Information

This section addresses safety considerations and describes symbols that may appear on the Meter or in the manual.

Note

. A free copy of the SCPI standard can be

Digital Multimeter

Safety Information

Symbols and Terms

The following terms and safety and electrical symbols may appear in the manual or on the product:

A XW Warning statement identifies conditions or practices that could result in injury or death.

A W Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected.

XW Warning

To avoid electric shock, personal injury, or death, carefully read the information in the DMM4040 and DMM4050 User Manual under “General Safety Summary” before attempting to install, use, or service the Meter.

Safety and Electrical Symbols

Symbol Description Symbol Description

Risk of danger. Important information. See manual.

Hazardous voltage. Voltage > 30 V dc or ac peak might be present.

Π Display ON / OFF and Meter reset.

J Earth ground

B AC (Alternating Current) E Capacitance F DC (Direct Current) G Diode D

AC or DC (Alternating or Direct Current)

I Fuse

C R

Continuity test or continuity beeper tone

Digital signal

Y Potentially hazardous voltage U Maintenance or Service

T Double insulated h

Measurement Category II is for

CAT II

measurements performed on circuits directly connected to the low voltage installation.

CAT I

Static awareness. Static discharge can damage parts.

Measurement Category I is for measurements not directly connected to mains.

Local and Remote Operation

When the Meter is operated from a host, it is said to be operated remotely. When operated from the front panel, it is said to be operated locally.

Most operations that can be performed locally can also be performed remotely over the remote interface. Some operations, like setting communications parameters for the

DMM4040/4050

Programmer Manual

Computer Interfaces

RS-232 interface, and addressing the Meter for IEEE-488 operations can only be set through the front panel.

XW Warning

To avoid electric shock, turn off the signal source to the Meter before touching the test leads. The front panel display may not indicate the true input voltage while in remote mode. Always assume lethal voltages exist on the front-panel inputs.

Both the DMM4040 and 4050 Multimeters come equipped with an RS-232, Ethernet, and IEEE-488 interface. Only one remote interface can be enabled at a time. Using any of the interfaces turns the Meter into a fully programmable instrument that can be integrated into an automated instrumentation system. For a PC with only USB ports, Tektronix provides a cable (Tektronix PN 174-5813-00) that converts between USB and RS-232 ports.

Note

The remote interface port and settings can be changed only through the Meter’s front-panel controls.

Enabling or selecting a port for remote operation is a separate process from setting the various parameters associated with a remote interface. An interface does not have to be selected to set its parameters; for example, the baud rate of the RS-232 port can be set while the Meter has the LAN port enabled as the remote control port.

Optimizing System Speed for I/O Operation

Several factors affect the remote system speed of the DMM4040/4050. To make the fastest measurements, it is best to store the measurements in internal memory before transferring across the I/O bus. This is particularly true if you want to collect a large number of samples per measurement. Set up all of the parameters (i.e. function, range, filters, etc...) prior to taking the measurements. Use the internal trigger. Set the trigger delay to zero. Turn off the display. If operating with RS-232, use the fastest baud rate available.

One example of taking fast voltage readings is:

*cls # This clears all error prior to initiating readings conf:volt:dc 0.1 # Set the DC range to manual and 100 mV. volt:dc:nplc 0.02 # Set the NPLC to faster reading rate 4 1/2 digits. zero:auto 0 # Turn Autozero off. trig:sour imm # Set immediate trigger. trig:del 0 # Set trigger delay to zero.

trig:coun 1 # Set trigger count to one or specify a larger number. disp off # Turn display off. This may slightly improve reading rate. syst:rem # Put the DMM4050 in remote. Only needed for RS-232 or

Ethernet #(required for READ? or MEAS?) samp:coun 100 # Set the sample count from 1 to 5000.

Digital Multimeter

Optimizing System Speed for I/O Operation

:INIT; *OPC? # "*OPC?" returns 1 indicating that the measurements have been

taken and are ready to be transferred to the computer using the FETCH? command.

:FETCH?

Note

For any sample count greater than 1, measurements are returned comma separated.

DMM4040/4050

Programmer Manual

Selecting the Remote Interface Port

Configuring the IEEE-488 Port

To enable or select a port for remote control of the Meter:

1. Press I.

2. Press PORT IF.

3. Press SELECT PORT.

4. Press the soft key labeled with the desired port: RS 232C, IEEE488, or LAN. Port selection is non-volatile. Therefore, the selected port will remain active until another

port is selected through the front panel.

The IEEE-488 interface is designed in compliance with supplemental standard IEEE-

488.2. Devices connected to the bus in a system are designated as talkers, listeners, talker/listeners, or controllers. The connector for connecting the Meter to the IEEE-488 bus is located on the rear panel. Under control of an instrument controller, the Meter operates exclusively as a talker/listener on the IEEE-488 bus.

The Meter conforms to the Standard Specification IEEE-488.1 – 1987: IEEE Standard

Digital Interface for Programmable Instrumentation, and to IEEE-488.2 - 2004: Codes, Formats, Protocols, and Common Commands.

IEEE-488 Operating Limitations

The following limitations govern the IEEE-488 remote interface:

• A maximum of 15 instruments may be connected in a single IEEE-488 bus system.

• The maximum length of IEEE-488 cable used on a single IEEE-488 system must be the

lesser of 20 meters, or 2 meters times the number of devices in the system.

Setting the IEEE-488 (GPIB) Port Address

Before the Meter will accept commands through the IEEE-488 remote interface, IEEE488 must first be enabled or selected as the active interface port. This can only be done through the Meter’s front panel.

A controller uses an address between 1 and 32 to identify a specific instrument on the bus. The Meter is shipped from the factory with the IEEE-488 port address set to 1. To change the IEEE-488 address:

1. Press I.

2. Press PORT IF.

3. Press IEEE488.

4. Use the soft keys to set the address as follows.

Select the address digit to adjust by pressing either <-- or -->.

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit.

5. With the desired address set, press ENTER.

Digital Multimeter

Configuring the IEEE-488 Port

Capability Commands

To conform to the IEEE-488.1 standard specification, it is not essential for a device to encompass the full range of bus capabilities. The IEEE-488.1 document describes and codes the standard bus features, so that manufacturers may give brief coded descriptions of their own interfaces’ overall capability.

The codes that apply to the Meter are given in Table 1 below, together with short descriptions. These codes conform to IEEE-488.2 requirements.

Appendix C of the IEEE-488.1 document contains a complete description of each code.

Table 1. IEEE-488 Compatibility Codes

IEEE-488 Subset Interface Functions

SH1 Source Handshake Capability

AH1 Acceptor Handshake Capability

T5 Talker (basic talker, serial poll, unaddressed to talk if addressed to listen)

L4 Listener (basic listener, unaddressed to listen if addressed to talk)

SR1 Service Request Capability

RL1 Remote/Local Capability (includes local lockout)

PP0 No Parallel Poll Capability

DC1 Device Clear Capability

DT1 Device Trigger – Supports group trigger (GET).

C0 No Controller Capability

E2 Open-Collector and Three-State Drivers

Interconnections

Instruments fitted with an IEEE-488 interface communicate with each other through a standard set of interconnecting cables, as specified in the IEEE-488.1 Standard document.

The IEEE-488 interface connector is located on the Meter’s rear panel.

DMM4040/4050

Programmer Manual

Configuring the RS-232 Port

The RS-232 Communication Interface allows ASCII, asynchronous, serial communication between the Meter and a host or terminal. The following sections describe the process of configuring the RS-232 port. To make the RS-232 port the active port for remote operation, see the “Selecting the Remote Interface Port” section above.

Table 2 lists the RS-232 parameter settings when the Meter leaves the factory.

Table 2. Factory Settings of RS-232 Communications Parameters

Parameter Factory Setting

Baud Rate 9600

Parity None (Parity bit 0)

Number of Data Bits 8 (7 data bits plus 1 parity bit)

Number of Stop Bits 1

Flow Control None

To access the RS-232 setup menu:

1. Press I.

2. Press the PORT IF soft key.

3. Press the RS 232C soft key.

At this point, all the RS-232 settings are made available.

All RS-232 port parameter settings are non-volatile and remain set until changed.

Setting RS-232 Baud Rate

To set the baud rate:

1. With the RS-232 set up menu displayed, press BAUD RATE.

There are eight pre-defined settings: 1200, 2400, 4800, 9600, 19200 38400, 57600, 115200, and 230400. These selections are displayed in two separate menus. When first entering baud rate selection, baud rates 9600 to 1200 are displayed. To get to the next five higher baud rates, press MORE. To get back to the lower baud rates, press B.

2. With the desired baud rate displayed, press the soft key under the chosen baud rate.

Note

Digital Multimeter

Configuring the RS-232 Port

Setting RS-232 Parity and Data Bits

To set the data bits:

1. With the RS-232 set up menu displayed, press PARITY DATA BIT.

2. Press the soft key under the desired parity, and data bit parameter.

NONE 8B DATA = No parity with 8 data bits ODD 7B DATA = Odd parity with 7 data bits EVEN 7B DATA = Even parity with 7 data bits

Setting RS-232 Stop Bits

To set the stop bits:

1. With the RS-232 set up menu displayed, press PARITY DATA BIT.

2. Press the soft key labeled 2 STOP BITS to toggle between 1 and 2 stop bits.

Note

When 2 STOP BITS is highlighted, the interface is configured to use 2 stop bits.

Setting RS-232 Flow Control

To set flow control:

1. With the RS-232 set up menu displayed, press FLOW CONTROL.

2. Press the soft key under the desired flow control.

NONE = No flow control XON = Software flow control Xon (hex 11) and Xoff (hex 13) RTS = Hardware flow control, RTS/CTS

Setting RS-232 End-Of-Line Character

To set the End-Of-Line (EOL) character:

1. With the RS-232 set up menu displayed, press EOL.

2. Press the soft key labeled with the desired End-Of-Line character(s).

CR = Carriage return only LF = Line Feed only CR LF = Carriage Return and Line Feed

Setting the EOL character(s) in RS-232 also sets the same EOL character(s) for Ethernet operation.

Note

Enabling and Disabling Fluke 45 Emulation Echo

Although you can turn echo on or off at anytime, the selection is only used or changed when the Meter’s command mode is set to Fluke 45 emulation.

To enable or disable Echo for the RS-232 port:

1. With the RS-232 set up menu displayed, press COMP/TERM ECHO.

2. Press either the ECHO or NO ECHO soft key.

DMM4040/4050

Programmer Manual

RS-232 Modes of Operation

DMM4040/4050 Mode

RS-232 communication is slightly different between the DMM4040/4050 and the Fluke 45 emulation modes. Switching between these two command languages is covered in the “Selecting the Programming Language” section later in this manual. The following sections explain the differences in communications protocol and how to set the Meter and computer parameters for proper operation.

There are two modes of RS-232 operation when the Meter has the DMM4040 or 4050 command set selected: TERMINAL and COMPUTER. The terminal mode is an interactive mode where an operator inputs commands, with immediate returns for requested information (queries) and interface messages. In terminal mode, characters sent to the Meter are echoed on the host’s display screen and a command prompt (for example 3>) is returned after the CR/LF is entered by the terminal. If you send a character to the Meter over the RS-232 interface, pressing the <DELETE> or <BACKSPACE> key deletes the previous character. A backspace is echoed to the host terminal.

Note

^C (CNTRL C) is the RS-232 equivalent of IEEE-488 DCI (device clear), causing “1>” followed by a carriage return and line feed to be output.

The computer mode is used when the Meter is operated by computer program. In this mode, requested information is returned by query, and interface messages are queued and returned by command. Characters are not echoed on the host computer and command prompts are suppressed. The <DELETE> or <BACKSPACE> keys are ignored.

Selecting Between Computer and Terminal Mode

Although you can select between Computer and Terminal mode at any time, the selection is only used or changed when the Meter’s command mode is set to DMM4040/4050.

To select computer or terminal mode from the front panel:

1. Press I and then PORT IF.

Note

If the RS-232 port is not already highlighted, press SELECT PORT and then RS 232C.

2. Press either RS 232C, COMP/TERM ECHO and select either COMPUTER or

TERMINAL.

Fluke 45 Mode

In the Fluke 45 Command emulation mode, there are two modes of RS-232 operation: ECHO or NO ECHO. In Echo mode, characters sent to the Meter are echoed on the host’s display screen. In No Echo mode, characters sent are not echoed.

To set the echo parameter, refer to the "Enabling and Disabling RS-232 Echo" section earlier in this manual. If you send a character to the Meter over the RS-232 interface, pressing the <DELETE> or <BACKSPACE> key deletes the previous character. A backspace is echoed to the display screen if Echo On mode is set.

In either mode, when the host sends a command to the Meter over the RS-232 interface, the Meter parses and executes the command, and returns a response if appropriate, and sends one of three prompts:

Digital Multimeter

Configuring the RS-232 Port

=> No errors were detected and the command was successfully parsed and

executed.

?> A Command Error was detected. The command was not executed because it

was not understood. For instance, this prompt would be returned if the Meter was sent an input string that contained a syntax error.

!> An Execution Error was detected. The command was understood but not

executed (i.e., a device-dependent error). For instance, this prompt would be returned if you attempted to use the decibels modifier (dB) on a frequency measurement (FREQ).

Note

^C (CNTRL C) is the RS-232 equivalent of IEEE-488 DCI (device clear), causing "=>" followed by a carriage return and line feed to be output.

Terminations for the end of line can be set to carriage return (CR), line feed (LF), or both (CRLF). Terminations for the end of line can be set in the <Instr SETUP><PORT IF><RS232C> selection.

To change the Meter to Fluke 45 Emulation Mode, setup the remote interface for RS-232 or IEEE-488 (Fluke 45 mode will not work over Ethernet):

For RS-232

1. Press I

2. Press PORT IF softkey.

3. Press the SELECT PORT softkey.

4. Press the RS 232C softkey. Set the baud rate to 9600 as follows:

1. Press I

2. Press PORT IF softkey.

3. Press the RS 232C softkey.

4. Press the BAUD RATE softkey.

5. Press the 9600 softkey. Set the RS-232 port to non-echo as follows:

1. Press I

2. Press PORT IF softkey.

3. Press the RS 232C softkey.

4. Press the COMP/TERM ECHO softkey.

5. Press the NO ECHO softkey.

For IEEE-488

1. Press I

2. Press PORT IF softkey.

Press the SELECT PORT softkey.

4. Press the IEEE488 softkey. Set the IEEE-488 address to a system compatible value as follows:

DMM4040/4050

Programmer Manual

Interconnections

1. Press I

2. Press PORT IF softkey.

3. Press the IEEE488 softkey.

4. Use the soft keys to set the address as follows.

Select the address digit to adjust by pressing either <-- or -->.

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character.

5. With the desired address set, press ENTER. To set the Meter to Fluke 45 emulation:

1. Press I

2. Press the COMMANDS softkey.

3. Press the FLUKE 45 softkey.

The Meter communicates with a host through a DB-9 interface connector on the rear panel of the Meter. Connect the Meter to the host or terminal using a cable appropriate to your application that is less than 50 feet (15 meters) long. Longer cables are permitted, providing that the load capacitance measured at the interface point (including the signal terminator) does not exceed 2500 picofarads.

Figure Error! Reference source not found. shows the pin-out of the Meter’s RS-232 port, and two possible cable connections for communicating with a PC.

Fluke 8842A Emulation Mode

The Fluke 8842A emulation mode is only available when the Meter has the IEEE-488 port selected. To change the Meter to Fluke 8842A Emulation Mode, setup the remote interface for IEEE-488 (Fluke 8842A emulation mode will not work over RS-232 or Ethernet):

1. Press I

2. Press PORT IF softkey.

3. Press the SELECT PORT softkey.

4. Press the IEEE488 softkey. Set the IEEE-488 address to a system compatible value as follows:

1. Press I

2. Press PORT IF softkey.

3. Press the IEEE488 softkey.

4. Use the softkeys to set the address as follows.

Select the address digit to adjust by pressing either <-- or

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character.

-->.

5. With the desired address set, press ENTER.

Digital Multimeter

Configuring the RS-232 Port

To set the Meter to Fluke 8842A emulation:

1. Press I.

2. Press the COMMANDS softkey.

3. Press the 8842 softkey.

4040/4050 Cable (Null Modem such as Fluke RS43) PC

Not Used

RxData

TxData

Not Used

GND

Not Used

RTS

CTS

Not Used

4040/4050

Not Used

RxData

TxData

Not Used

GND

Not Used

RTS

CTS

Not Used

No Connect

RxData

TxData

DTR

GND

DSR

RTS

CTS

No Connect

Cable (USB to RS-232 such as Tektronix 174-5813-00) PC

No Connect

RxData

TxData

DTR

GND

DSR

RTS

CTS

No Connect

DCD

RxData

TxData

DTR

GND

DSR

RTS

CTS

USB

Adapter

DCD

RxData

TxData

DTR

GND

DSR

RTS

CTS

USB

Interface

Keys

DCD

RxData TxData DTR GND

Data Carrier Detect

Receive Data

Transmit Data

Data Terminal Ready

Circuit Ground

DSR RTS CTS RI

Data Set Ready

Request to Send

Clear to Send

Ring Indicator

gdb058.eps

Figure 1. RS-232 Pin-out and Cable Interconnect

DMM4040/4050

Programmer Manual

Configuring the Ethernet (LAN) Port

The Meter can be remotely controlled through the LAN port on the Meter’s rear panel. To select the LAN port as the remote control port, see the “Selecting the Remote Interface” section above.

Configuring the LAN port is accomplished through the Instrument Setup function. The selectable LAN port parameters are: DHCP (Dynamic Host Configuration Protocol), IP Address, Net mask, Host Name, Mac Address, Gateway, Port number, and Domain.

When setting IP addresses, subnet masks, and default gateways on the Meter, keep in mind they are stored as 32-bit binary numbers and expressed as four 3-digit segments in dot-notation form. For example, xxx.xxx.xxx.xxx, where xxx is a byte value, is stored as a 32-bit binary number.

To set the LAN port parameters:

1. Press I.

2. Press the PORT IF soft key.

3. Press the LAN soft key.

Note

When addressing some LAN addresses, computers will often interpret 0's in the IP address as OCTAL values. As an example, if you configure your IP address from the front panel as 129.196.017.023 and then attempt to establish a connection to the meter, you should connect using the IP address 129.196.17.23. Attempting to establish a connection to

129.196.017.023 may result in a connection request to 129.196.15.19.

Setting the IP Address

An internet (IP) address is required for all internet and TCP/IP communications. If DHCP is enabled, the Meter will use the dynamic address supplied by the DHCP server. However, if the DHCP server fails to supply the address, or DHCP is disabled, the currently configured static IP address will be used.

Selecting Dynamic Host Configuration Protocol (DHCP)

Dynamic Host Configuration Protocol (DHCP) is a client-server protocol that eliminates having to manually set permanent/static IP addresses. The DHCP server provides configuration parameters (dynamic IP address, subnet mask, and default gateway IP addresses) which are required for a client to participate in an IP network.

Using DHCP is the easiest way to configure the Meter for remote communication through the LAN interface. DHCP is enabled when the Meter is shipped from the factory. When connected to a network, and the LAN port is enabled, the Meter will try and retrieve the parameters from a DHCP server necessary for communications. If the parameters can’t be obtained, the Meter switches to the parameters that were manually entered into the Meter.

To disable or enable DHCP on the Meter: From the PORT IF menu, press LAN. If DHCP is already enabled, then DHCP will

be highlighted in the display. Pressing DHCP will toggle between enabled and disabled.

Digital Multimeter

Configuring the Ethernet (LAN) Port

Note

After changing any Ethernet setting (except the socket port), the Meter must be powered off and on again, using the rear-panel power switch, to make the change active.

Setting a Static Internet Address

The Meter comes from the factory with 000.000.000.000 in the static IP address register.

Note

If you are planning to use the Meter on a corporate LAN and do not wish to use DHCP, contact your network administrator for a static IP address to be used exclusively by your Meter. DHCP must be disabled to set a static IP address.

To change the Meter’s static IP Address:

1. From the LAN Port setup menu, press the IP_ADDR soft key.

2. Use the soft keys to set the IP Address as follows:

To select the address character to adjust, press either <-- or -->.

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit.

3. Press the ENTER soft key.

The IP address is stored in non-volatile memory, and does not change when power is removed and reapplied to the Meter or when the Meter receives an *RST command.

Setting the LAN Subnet Mask

If communication between the host computer and the Meter passes through a router or gateway, and DHCP is disabled, you must set the subnet mask and default gateway address on both the host computer and the Meter. Get the correct subnet mask and gateway address from your network administrator.

The LAN Subnet Mask is a 32-bit number. This number is represented as four 3-digit segment numbers on the front-panel display. The default subnet mask set at the factory is

255.255.254.0. To change the Meter’s subnet mask:

1. From the LAN Port setup menu, press the NETMASK soft key.

2. Use the soft keys to set the subnet mask as follows:

To select the mask character to adjust, press either <-- or -->.

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit.

Note

3. Press the ENTER soft key. The new Subnet Mask will not take effect until the Meter has been powered down and

back up again using the rear-panel power switch.

DMM4040/4050

Programmer Manual

Reading the Domain Name

Configuring the Host Name

The Domain Name is supplied by the DHCP server and cannot be changed. To read the domain name:

1. From the LAN Port setup menu, press MORE.

2. Press the DOMAIN soft key.

3. Press B to return to the LAN Port setup menu.

The Host Name is the host portion of the domain name, which is translated into an IP address. The Meter’s default host name is “test1”.

To change the Host Name:

1. From the LAN Port setup menu, press the HOSTNAME soft key.

2. Use the soft keys to set the Host Name as follows:

To select the character to adjust, press either <-- or -->.

With the desired character selected, press the soft key labeled -- to decrement the character or ++ to increment the character.

3. Press the ENTER soft key. The new Host Name will not take effect until the Meter has been powered down and back

up again using the rear-panel power switch.

Reading the MAC Address

The MAC Address is set at the factory and cannot be changed. To read the MAC Address:

1. From the LAN Port setup menu, press MORE.

2. Press the MAC_ADDR soft key.

3. Press B to return to the LAN Port setup menu.

Configuring the LAN Default Gateway

The default gateway IP address is the IP address of a gateway (router) attached to the same network as the device. When the instrument detects that a host computer is not on the same network (using the network number), the data is sent through the gateway to reach the host computer.

The default for the Meter is “0” (no gateway, and subnetting is not being used). To set the LAN Default Gateway address:

1. From the LAN Port setup menu, press MORE.

2. Press GATEWAY.

3. To select the digit to adjust, press either <-- or -->.

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit.

4. Press the ENTER soft key.

Digital Multimeter

The new gateway address will not take effect until the Meter has been powered down and back up again using the rear-panel power switch.

Configuring the General Network Socket Port

In order to communicate with each other, a host computer and the Meter must use the same socket port number. The default port is 3490. Typically, the default port does not need to be changed. If the socket port must be changed, enter the Socket Port number supplied by your network administrator.

To change the Socket Port number:

1. From the LAN Port setup menu, press the MORE soft key.

2. Press the PORT # soft key.

3. To select the digit to adjust, press either <-- or -->.

With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit.

4. Press the ENTER soft key. The new Network Socket Port becomes effective immediately.

Establishing an Ethernet Connection

Note

The Network Socket Port Number is stored in non-volatile memory.

Establishing an Ethernet Connection

The easiest method of establishing an Ethernet connection with the Meter is through the commonly available program: Telnet. Telnet is a client-server protocol, based on TCP. The Telnet Protocol provides a fairly general, bi-directional, eight-bit byte oriented communications facility. Telnet is available on all UNIX servers and on most PCs.

Telnet clients typically connect to hosts on socket port 23. The LAN connection to the Meter must be established using the specified Network Socket Port. See the “Configuring the General Network Socket Port” section above. When the remote interface port is changed to LAN from the Meter’s front panel, a LAN server is initiated in the Meter which listens for client connections on the socket port at the specified IP address.

To establish a LAN connection to the Meter from a computer using either UNIX, LINUX, or MS-DOS command prompts, perform the following procedure:

1. On the Meter’s front panel, change the remote interface port to LAN

2. At the command prompt on the client computer, enter: telnet <IP Address> <Socket Port> Alternatively, if you are using DHCP and would like to connect using the host name

rather than the IP address, from the computer command prompt enter: telnet <Domain Name> <Socket Port> As an example, if you know the IP address is 129.196.136.131 and the Socket Port is set

to 3490, enter the following at a command prompt from any client computer: telnet 129.196.136.131 3490 If you are using DHCP and the host name is test1 and the fully qualified domain name is

test1.na.tektronix.com and the Socket Port is set to 3490, enter the following at the computer command prompt:

DMM4040/4050

Programmer Manual

telnet test1.na.tektronix.com 3490 Once the internal LAN server connects with the client computer, the LAN server will

reject any other connection attempts by other computers and will “tunnel” a channel to the connected computer. This prevents multiple computers from trying to control the Meter.

Digital Multimeter

Terminating an Ethernet Connection

When you wish to terminate the Ethernet connection, you may do so one of two ways:

1. Change the Meter’s remote interface port to something other than LAN

2. Terminate the Telnet session on the client computer If you have established a LAN connection to the Meter using Telnet and change the

remote interface port using the Meter’s front panel, the LAN server in the Meter will automatically terminate the Telnet session on the client computer.

On the other hand, you may wish to terminate the Telnet session on the client computer but maintain the current LAN remote interface port configuration. Client Telnet session termination can vary from computer to computer, but typically terminating the shell (or command window in DOS) will terminate the telnet session. When the client terminates the Telnet session, the LAN server in the Meter will go back into listen mode waiting for a new client to make a LAN connection request.

Selecting the Programming Language

The Meter’s remote command set is switchable between DMM4040/4050, Fluke 8842A, and Fluke 45 commands. The Meter’s standard remote command set (DMM4040/4050) is compatible with Agilent’s 34401A SCPI command set. Although every effort was made to make the Meter compatible with Fluke 45 commands and Fluke 8842A commands, there are some commands that are not compatible. See Appendix B, “Fluke 45 Emulation Limitations” for details on Fluke 45 commands that are not compatible with this Meter. See Appendix D, “Fluke 8842A Emulation Limitations” for details on Fluke 8842A commands that are not compatible with this Meter.

To change the Meter’s remote command set:

1. Press I.

2. Press the COMMANDS soft key.

3. Press the soft key labeled with the desired command set.

Getting Started With an Installation Test

After the Meter has been cabled to a host, and prepared to communicate with it via the RS-232 or IEEE-488 interface (as described above), test the system to verify that it is operational.

Installation Test for RS-232 Connections

The procedure below illustrates how the Meter performs a computer interface command, and at the same time, confirms that the Meter has been properly set up and connected for RS-232 remote operation:

1. Press the POWER button to turn on the Meter.

2. Start up a computer terminal program.

3. Verify that the computer interface parameters (e.g., baud, parity) are set correctly.

4. Send the Meter the following command.

*IDN? <CR>

5. Verify that the Meter sends the following response:

DMM4040/4050

Programmer Manual

Installation Test for IEEE-488 Connections

In DMM4040 mode: TEKTRONIX, DMM4040, nnnnnnnm, mm/dd/yy – tt:tt

In DMM4050 mode:

TEKTRONIX, DMM4050, nnnnnnnm, mm/dd/yy – tt:tt

In Fluke 45 mode: FLUKE, 45, nnnnnnn, n.n Dn.n

In these results, nnnnnnn is your Meter's serial number; n.n identifies the main software version; and Dn.n identifies the display software version.

The procedure below illustrates how the Meter performs a computer interface command, and at the same time, confirms that the Meter has been properly set up, and connected for IEEE-488 operation:

1. Turn on the Meter.

2. Verify that the meter's IEEE-488 address is set correctly.

3. Turn on the host or controller.

4. Enter the following at the host:

Note

This is a BASIC program to give an idea of how the test could be done. Syntax may vary with the host.

INIT PORT 0<CR> CLEAR PORT 0<CR> PRINT @<address of meter>, "*IDN?"<CR> INPUT LINE @<address of meter>, A$<CR> PRINT A$<CR>

5. Verify that the meter sends the following response

In DMM4040 mode: TEKTRONIX, DMM4040, nnnnnnnm, mm/dd/yy – tt:tt

In DMM4050 mode:

TEKTRONIX, DMM4050, nnnnnnnm, mm/dd/yy – tt:tt

In Fluke 45 mode: FLUKE, 45, nnnnnnn, n.n Dn.n

In these results, nnnnnnn is your meter's serial number, n.n identifies the main software version, and

Dn.n identifies the display software version.

If the Test Fails

If the Meter does not respond to the test procedure as indicated:

1. Check all cable connections.

2. Check to see the remote interface has been properly enabled and addressed.

Digital Multimeter

How the Meter Processes Input

The following paragraphs summarize how the Meter processes input that is received from a host or stand-alone terminal.

Note

In this manual, input means a string sent to the Meter from a host. Output means a string sent from the meter through the computer interface to the host.

Input Strings

The meter processes and executes valid input strings sent by the host. A valid input string is one or more syntactically correct commands followed by an input terminator.

When the meter receives input, it stores it in a 350-byte input buffer.

Note

Input strings received over the RS-232 interface are not executed or checked for proper syntax until an input terminator is received or the input buffer becomes full.

The Meter accepts alphabetic characters in either upper- or lower-case. If a command cannot be understood (i.e. the equivalent of an IEEE-488 Command Error), the remainder of the command line is ignored.

Input Terminators

An input terminator is a character or command (IEEE-488.1) sent by the host that identifies the end of a string.

In RS-232 applications, when the Meter receives an input terminator, it executes all commands entered since the last terminator was received on a first-in, first-out basis.

As input characters are processed and executed, space is made available in the input buffer for new characters. In RS-232 applications, if a communications error (e.g., parity, framing, over-run) is detected, a device-dependent error is generated, and the input string is discarded. If the Meter's input buffer becomes full when it is used with the RS-232 interface, a device-dependent error is generated (see "Event Status and Event Status Enable Register"), and the input string is discarded. If, on the other hand, the input buffer becomes full when the IEEE-488 interface is used, the Meter stops accepting characters until there is room in the buffer. Characters in the input buffer cannot be over-written with the IEEE-488 interface.

Valid terminators for the RS-232 interface are:

• LF (Line Feed)

• CR (Carriage Return)

• CR LF (Carriage Return/ Line Feed)

Valid terminators for the IEEE-488 interface are:

• EOI (End or Identity) on any character

• LF (Line Feed)

In some instances, a terminator is automatically transmitted at the end of the host's output string (i.e., the Meter's input string). For example, in Fluke BASIC, the PRINT statement finishes with a CR LF pair.

DMM4040/4050

Programmer Manual

Typical IEEE-488 Input Strings

Sending Numeric Values to the Meter

Sending Command Strings to the Meter

Two typical strings that could be sent to the Meter over the IEEE-488 interface are shown in Figure Error! Reference source not found.. These strings are written in BASIC to be sent from an instrument controller or computer.

Numeric values can be sent to the Meter as integers, real numbers, or real numbers with exponents, as shown in the following examples:

EXAMPLE EXPLANATION +12345689 Sends the signed integer +12345689

-1.2345E2 Sends -1.2345 x 10

Observe the following rules when you construct strings to be sent to the Meter over the computer interface:

• RULE 1: READ METER'S OUTPUT BUFFER ONLY ONCE FOR EACH QUERY

COMMAND.

The Meter’s output buffer is cleared after it is read. This prevents previously read data from being read a second time by mistake. If you attempt to read the meter’s output buffer twice without an intervening query, the Meter will not respond to the second read.

• RULE 2: READ QUERY RESPONSES BEFORE SENDING ANOTHER QUERY

COMMAND STRING.

Output data remains available in the output buffer until read by the host or until the next command string is received by the Meter. This means the Meter’s output buffer must be read by the host before, and not after, the next command string is sent to the Meter.

• RULE 3: THE METER EXECUTES EACH COMMAND COMPLETELY, IN THE

ORDER RECEIVED, BEFORE MOVING ON TO THE NEXT COMMAND.

If an input string contains a trigger, enter the commands in the following order, that is, from left to right, as written:

1. Commands (if any) to configure the Meter.

2. The trigger command.

3. Commands to read the result of a triggered measurement (FETCh? or READ? for

the DMM4040/4050 and VAL? for the Fluke 45 emulation), or to reconfigure the instrument (if any).

4. The terminator.

Figure 2 gives two examples of a command string for the Meter. The first example is a command recognized by the Meter in the DMM4040 or 4050 command mode. The second example is for the Fluke 45 command mode.

Digital Multimeter

In the following examples, <space> between commands is for readability only. However a <space> between a command and its argument is required. The PRINT command sends a terminator at the end of the string.

How the Meter Processes Output

EXAMPLE 1:

The following string configures the Meter and triggers an ohms reading to be shown on the primary display when the Meter is in 4040 or 4050 command mode.

IEEE-488 bus address

Reset to power-up configuration

Select function 1 ohm range

Select 1 PLC measurement rate

Select Bus triggering

Wart-for-trigger state

Trigger a reading

Return reading shown on primary display

EXAMPLE 2:

The following string configures the Meter and triggers an ohms reading to be shown on the primary display when the Meter is in Fluke 45 emulation mode.

PRINT @3, "*RST; CONF:RES 1; :RES:NPLC 1; :TRIG:SOUR BUS; :INIT; *TRG; FETCH?"

PRINT @3, "*RST;

OHMS; RANGE 1; RATE M; TRIGGER 2; *TRG; VAL1?"

IEEE-488 bus address

Reset to power-up configuration

Select function

Select 300 range

Select medium reading rate

Select external trigger (Rear panel trigger disabled, no trigger delay)

Trigger a reading

Return reading shown on primary display

gdb19f.eps

Figure 2. Typical IEEE-488 Input String

How the Meter Processes Output

The following paragraphs summarize how the Meter processes output. The Meter outputs an alphanumeric string in response to a query command from the host. Query commands

DMM4040/4050

Programmer Manual

Triggering Input

are easily identified because they all end with "?". An output string is terminated by a Carriage Return and Line Feed (<CR><LF>) for RS-232 or Ethernet applications, or a Line Feed with End or Identity (<LF><EOI>) for IEEE-488.

After sending the Meter a query command via the RS-232 interface, wait for the Meter to return a prompt before sending another query command. Although the Meter will accept and process all commands other than a query command, a device-dependent command error is generated; and the second command is discarded if it is a query command.

If the Meter is part of an IEEE-488 bus system, the output data is not actually sent onto the bus until the host addresses the Meter as a talker. When the output buffer is loaded, the Message Available (MAV) bit in the Status Byte Register is set true. (For more information, see "Status Byte Register.”)

Numeric output from the Meter is displayed as shown in the following examples: EXAMPLE EXPLANATION +1.2345E+0 Measured value of 1.2345

+1.2345E+6 Measured value of 1.2345 x 10

While under remote control, the Meter must be placed in a wait-for-trigger state before a measurement can be triggered. The INITiate and READ? commands set the Meter in to a wait-for-trigger state. The number of measurements (samples) and the number of triggers the Meter will accept after being put in a wait-for-trigger state are variables set using remote commands. The defaults for these variables are one sample per trigger and one trigger per wait-for-trigger state. See the Trigger and Sample remote commands to set these values.

All available trigger methods fall into two basic categories:

• Internal triggering uses the Meter’s internal trigger circuit for a continuous source of

triggers.

• External triggering comes from a source outside the Meter controlled by the user.

Internal Triggering

When the Meter’s trigger source is set to immediate, measurements are triggered by the Meter’s internal trigger circuit. As an example, with the sample count set to 5 and the trigger count set to 2, the Meter will collect 10 measurements after it receives an INITiate or READ? command and then stop taking measurements. The READ? command will return all 10 readings immediately while the INITiate command must be followed by a FETCh? command to retrieve the measurements.

Digital Multimeter

Service Requests (IEEE-488 Only) and Status Registers

External Triggering

There are three methods of triggering the Meter externally:

• A trigger signal applied to the external trigger jack on the Meter’s rear panel.

When the Meter’s trigger source is set to external and the Meter is in a wait-fortrigger state, a negative-going signal on the external trigger jack will trigger a measurement cycle.

• IEEE-488.1 GET command (IEEE-488 Interface only)

• *TRG command

When the Meter’s trigger source is set to BUS and the Meter is in a wait-for-trigger state, either a *TRG or bus GET command will trigger the Meter to take measurements.

Service Requests (IEEE-488 Only) and Status Registers

Service requests let an instrument on the IEEE-488 bus get the attention of the host. Service requests are sent over the service request (SRQ) bus line.

If more than one instrument on the bus is capable of sending service requests, the host can determine which instrument made the request by taking a serial poll. Each instrument on the bus responds to the poll by sending the contents of its Status Byte Register. If an instrument on the bus has made a service request, the request service bit (RQS, bit 6) of its Status Byte Register will be set to 1, identifying it as an instrument that requested service.

The contents of the Status Byte Register (STB) is determined by the Service Request Enable Register (SRE), Standard Event Status Register (ESR), Standard Event Status Enable Register (ESE), Questionable Data Event Register, Questionable Data Enable Register, and the output buffer. These status registers are discussed below, and summarized in Table 3. Figure 3 shows the relationship of these registers.

Table 3. Status Register Summary

Status Byte Resister *STB? None SRE

Status Byte Enable Register *SRE? *SRE None

Standard Event Register *ESR? None ESE

Standard Event Enable Register

Questionable Data Event Register

*ESE? *ESE None

STAT:QUES:EVEN? None Questionable Data

Enable Register

Questionable Data Enable Register

STAT:QUES:ENAB? STAT:QUES:ENAB

<value>

None

DMM4040/4050

Programmer Manual

Questionable Data Binary Wieghts

Event Register Enable Register

Voltage Overload

Current Overload1

Not Used

Not Used Not Used Not Used Not Used Not Used Not Used Not Used

Ohms Overload

Not Used

Limit Test Fail LO11 Limit Test Fail HI12

Remote Mode

Not Used Not Used

STAT:QUES:EVEN? STAT:QUES:ENAB <value>

STAT:QUES:ENAB?

Standard Event

"OR"

20 = 1 2 2 2 2 2 2 2 2

3 4 5 6

Event Register Enable Register

Operation Complete

Not Used

Query Error2 Device Error3

Execution Error4

Command Error

Not Used

Power On

*ESR? *ESE <value>

*ESE?

"OR"

Figure 3. Overview of Status Data Structure (DMM4040/4050 and Fluke 45)

= 2 2

= 4 210 = 1024

= 8 211 = 2048

= 16 212 = 4096

= 32 213 = 8192

= 64 214 = 16384

= 128 215 = 32768

= 256

= 512

Status Byte

Summary Register Enable Register

Not Used Not Used

Not Used Questionable Data Message Available

Standard Event

Request Service

Not Used

Serial Poll (SPOLL) *STB?

*SRE <value> *SRE?

Output Buffer

"OR"

caw01f.eps

Standard Event Status and Standard Event Status Enable Registers

The Standard Event Status Register (ESR) assigns events to specific bits (see Figure 3 and Table 4). When a bit in the ESR is set (for example, 1), the event that corresponds to that bit has occurred since the register was last read or cleared. For example, if bit 3 (DDE) is set to 1, a device-dependent error has occurred.

The Standard Event Status Enable Register (ESE) is a mask register that allows the host to enable or disable (mask) each bit in the ESR. When a bit in the ESE is 1, the corresponding bit in the ESR is enabled. When any enabled bit in the ESR changes from O to 1, the Standard Event bit in the Status Byte Register also goes to 1. When the ESR is read (using the *ESR? command) or cleared (using the *CLS command), the Standard Event bit in the Status Byte Register returns to 0.

Table 4. Description of Bits in ESR and ESE

Bit No. Name True (Set to 1) Conditions

Operation Complete (OPC)

Not used

All commands previous to receipt of an *OPC command have been executed. Interface is ready to accept another message.

Always set to zero.

Digital Multimeter

Service Requests (IEEE-488 Only) and Status Registers

Query Error (QYE)

Device-Dependent Error (DDE)

Execution Error (EXE)

Command Error (CME)

Not used

Power On

Attempt has been made to read data from the Meter's output buffer when no output is present or pending. Possibly a new command line has been received before a previous query has been read or both input and output buffers are full.

Incorrect input during calibration, or RS-232 input buffer overflow.

Command was understood but could not be executed. Results from, for example, an inappropriate parameter.

Command not executed because it was not understood. This condition might occur when, for example, a command sent to the meter contained a syntax error.

Always set to zero.

(PON) Power has been cycled off and on since the last time the ESR was read or cleared.

Questionable Data Event Register and Questionable Data Enable Register

The Questionable Data Event Register provides information about the Meter’s measurements. Information such as overload conditions, high/low limits, and whether or not the Meter is in remote mode can be reported through the questionable data summary bit. Once a bit is set by the Meter, it remains set until it is read from the register or is cleared. The sixteen bits of the Questionable Data Event Register are described in Table 5.

The Questionable Data Enable Register determines which of the bits in the Questionable Data Event Register will be used to the set the Questionable Data Summary bit in the Meter’s Status Byte. When a bit in the Questionable Data Enable Register is 1, the corresponding bit in the Questionable Data Event Register is enabled. When any enabled bit in the Questionable Data Event Register changes from 0 to 1, the Questionable Data bit in the Status Byte Register also goes to 1. When the Questionable Data Event Register is read (using the STAT:QUES:EVEN? command) or cleared (using the *CLS command), the Questionable Data bit in the Status Byte Register returns to 0.

Table 5. Description of Bits in the Questionable Data Register

Bit No. Name True (Set to 1) Condition

0 Voltage Overload

1 Current Overload

2 – 8 Not Used

9 Ohms Overload

10 Not Used

Input voltage has exceeded the upper limit of the range.

Input current has exceeded the upper limit of the range.

The resistance measurement has exceeded the upper limit of the range.

11 Limit Test Fail Lo

The measurement is below the low end of the test limit.

DMM4040/4050

Programmer Manual

12 Limit Test Fail Hi

13 Remote Mode The Meter is set in remote mode.

14 – 15 Not Used

Status Byte Register

The Status Byte Register (STB) is a binary-encoded register that contains eight bits. Note that the Service Request Enable Register (SRE) uses bits 1 through 5, and bit 7 to set, the request service (RQS) bit 6, as enabled by the SRE. When the RQS bit is set true (l), the Meter sets the SRQ line true (1), which generates a service request. The eight bits of the Status Byte Register (as read by the *STB? command) are described in Table 6.

Reading the Status Byte Register

The host can read the Status Byte Register by performing a serial poll, or sending the Meter a *STB? query. The value of the status byte is not affected by the *STB? query. When the Status Byte Register is read, an integer is returned. This integer is the decimal equivalent of an 8-bit binary number. For example 48 is the decimal equivalent of the binary 00110000, and means that bit 4 (Message Available) and bit 5 (Standard Event) are set to “1”.

If the status byte is read by serial poll, bit 6 is returned as a request service (RQS); if it is read with an *STB? query, bit 6 is returned as Master Summary Status (MSS).

EXAMPLE EXPLANATION

The measurement is above the high end of the test limit.

*STB? Reads the Status Byte Register. Assume that “32” is returned. Converting 32

to the binary 00100000 indicates that bit 5 (Standard Event) is set to 1. To determine the event status, you would have to read the Standard Event Register in the same manner, using the *ESR? command.

Table 6. Description of Bits in the Status Byte Register

Bit No. Name True (Set to 1) Condition

0 Not used Always set to 0.

1 Not used Always set to 0.

2 Not used Always set to 0.

3 Questionable Data One or more of the enabled events in the

Questionable Data Event Register have occurred. To determine which Questionable Data events have occurred, send the Meter STAT:QUES:EVEN? to read the Questionable Data Event Register.

4 Message Available (MAV) Data is available in the output buffer. Bit set to 1

when response to query placed in output buffer. Bit cleared (set to 0) when output terminator sent to host.

5 Standard Event Status (ESB) One or more of the enabled events in the Event

Status Register have occurred. To determine which events have occurred, send the Meter *ESR? to read the Event Status Register.

Digital Multimeter

6 Master Summary Status† (MSS) Set to 1 if any enabled bit in the STB (MSS) register

is set to 1, otherwise set to 0. Status of MSS bit returned by *STB? query command.

Request Service (RQS) Set to 1 if service requested from front panel, or MSS set to 1. Status of bit returned by serial poll, which clears RQS.

7 Not Used Always set to zero.

† As read by *STB? command. If the Status Byte Register is read by a serial poll, bit 6 is returned as RQS.

Supported SCPI Commands

Service Request Enable Register

The SRE Register is an 8-bit register that enables or disables (i.e., masks) corresponding summary messages in the Status Byte Register.

The Meter may be programmed to make a service request on errors, questionable data, or when output is available. Conditions that trigger a service request are specified by writing a binary weighted value to the SRE Register, using the *SRE command.

EXAMPLE EXPLANATION *SRE 16 Enables the generation of an SRQ when bit 4 (Measurement

Available) in the Status Byte Register is set to 1. 16 is the decimal equivalent of 00010000 binary. This means that bit 4 in SRE Register (that corresponds to the Measurement Available bit in the Status Byte Register) is 1, and all other bits are 0.

EXAMPLE EXPLANATION *SRE 48 Enables the generation of an SRQ when bits 4 or 5 (Measurement

Available or Standard Event) in the Status Byte Register are set to 1. The binary equivalent of 48 is 00110000, indicating that bits 4 and 5 are set to 1.

If any bit in the SRE is set to 1, the RQS bit (bit 6) in the Status Byte Register is enabled, meaning a service request can be generated when the appropriate bits in STB become 1.

Use the *SRE? query (see Table 9) to read the SRE Register. The Meter returns a binaryweighted integer that represents the enabled bits in the register. (The value of bit 6 will always be zero.) Convert the returned value to binary to determine the status of register bits.

EXAMPLE EXPLANATION *SRE? Reads the value of the SRE Register. Assume "32" is returned.

Converting 32 to the binary 00100000 indicates that bit 5 in the SRE is set to 1.

Supported SCPI Commands

This section explains the SCPI (Standard Commands for Programmable Instruments) commands available to program the Meter. This section includes the following information:

• A list of the supported SCPI Commands

• A discussion of how to use the command set

• A detailed description of each command in the set

• Error handling for the DMM4040/4050

DMM4040/4050

Programmer Manual

SCPI Command Summary

Note

Throughout this document, the following conventions are used for SCPI command syntax. Square brackets ( [ ] ) indicate optional keywords or parameters. Braces ( { } ) enclose parameters within a command string. Triangle brackets ( < > ) indicate that you must substitute a value for the enclosed parameter.

Tables 7 through 16 summarize the SCPI commands implemented in the DMM4040 and DMM4050 Digital Multimeters.

Table 7. CALibration Command Summary

Command Description

CALibration? [{on|off}] CALibration :COUNt? :RECord :SECure :CODE <new code> :STATe {off|on}, <code> :STATe? :STRing <quoted string> :STRing? :DATE <date> :DATE? :VALue <value> :VALue? :STEP <step #>[,Reference] :STEP?

Table 8. CONFigure Command Summary

Command Description

CONFigure[:SCALar] [:VOLTage] [:DC [{range}[, {resolution}]]] :RATio :AC [{range}[, {resolution}]] :CURRent [:DC[ {range}][, {resolution}]]] :AC [{range}][, {resolution}]] :RESistance [{range}[, {resolution}]] :FRESistance [{range}[, {resolution}]] :FREQuency [{range}[, {resolution}]] :PERiod [{range}[, {resolution}]] :CAPacitance [{range}[, {resolution}]] :TEMPerature:FRTD [{<RTD Type>}] :TEMPerature:RTD [{<RTD Type>}] :CONTinuity :DIODe [{low current}][, {high voltage}]] CONFigure?

Perform a calibration Path to the calibration function Retrieves number of times Meter has been calibrated Records calibration values Path to calibration security function Change security code Unsecure / secure calibration mode Retrieves state of security mode Record calibration information Retrieves calibration information Set the calibration date Retrieve the calibration date Specify calibration signal value Retrieves calibration signal value Set the calibration step and reference Retrieve the calibration step

Subsystem to set Meter function Path to set voltage function Selects dc volts function Selects dc volts ratio function Selects ac volts function Path to set current function Selects dc current function Selects ac current function Selects resistance function Selects 4-wire resistance function Selects frequency function Selects period function Selects capacitance function Selects 4-wire temperature function Selects 2-wire temperature function Selects continuity function Selects diode function Retrieves present Meter configuration

Digital Multimeter

Table 9. IEEE-488.2 Common Command Summary

Command Description

Supported SCPI Commands

*CLS

*ESE <enable value> *ESE?

*ESR?

*IDN?

*OPC *OPC?

*PSC {0|1} *PSC?

*RST

*SRE <enable value> *SRE?

*STB?

*TST

*TRG

Clear status byte summary, and all event registers

Enable bits in standard event register Retrieve standard event enable register

Retrieve standard event register

Retrieve meter’s identification string

Set ‘Operation Complete” bit in Standard event reg. Returns “1” in output buffer after command execution.

Power-on status clear Retrieve power-on status clear setting

Reset Meter to its power-on state

Enable bits in status byte register Retrieve bits in status byte register

Retrieve the status byte summary register

Perform self-test. Returns “0” if the test succeeds, “1” if the test fails.

Trigger a measurement

Table 10. Math Command Summary

Command Description

CALCulate :AVERage :MINimum? :MAXimum? :AVERage? :COUNt? :DB :REFerence {<value>|MINimum|MAXimum} :REFerence? :DBM :REFerence {<value>|MINimum|MAXimum} :REFerence? :FUNCtion {NULL|DB|DBM|AVERage|LIMIt} :FUNCtion? :KMATh :STATe { on|off} :MMFactor{<value>} :MMFactor? :MBFactor{<value>}

Path to the math functions Path to MIN-MAX function Retrieves the recorded minimum value Retrieves the recorded maximum value Retrieves the recorded average value Retrieves the number of readings during MIN-MAX run Path to DB function Store relative value in relative register

Retrieves the relative value from the relative register Path to DBM function Select dBm reference value

Retrieves the present dBm reference value Sets the math function

Retrieves the present math function Path to math functions Disables/enables mx+b calculations Sets the value of “m” for mx+b Reads the value of “m” for mx+b Sets the value of “b” for mx+b

DMM4040/4050

Programmer Manual

:MBFactor? :MUNits{<name>} :MUNits? :LIMit :LOWer{<value>|MINimum|MAXimum} :LOWer? :UPPer{<value>|MINimum|MAXimum} :UPPer? :NULL :OFFSet {<value>|MINimum|MAXimum} :OFFSet? [MINimum|MAXimum] :STATe {ON|OFF} :STATe?

DATA :FEED RDG_STORE, {“CALCulate”|” ”} :FEED?

Table 11. MEASure Command Summary

Command Description

MEASure[:SCALar] :CAPacitance? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] :CONTinuity? :CURRent :DC? [{<range>|MIN|MAX|DEF}[, {<resolution>|MIN|MAX|DEF}]] :AC? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] :DIODe? [{low current}][, {high voltage}]] :FREQuency? :FRESistance? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] :PERiod? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] :RESistance? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] :TEMPerature:FRTD? [{<RTD Type}] :TEMPerature:RTD? [{<RTD> Type>}] :VOLTage :AC? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] [:DC]? [{<range>|MIN|MAX|DEF}[{,<resolution>|MIN|MAX|DEF}]] :RATio?

Reads the value of “b” for mx+b Sets the units name for mx+b Reads the units name for mx+b Path to limit testing function Set the lower limit for limit testing Retrieves the lower limit Set the upper limit for limit testing Retrieves the upper limit Path to null function Sets the offset value Retrieves set or maximum or minimum offset value. Disable/enable selected math function Retrieves the state of the math function

Path to storing readings taken with INITiate command Enables/disables storing of INITiate readings Retrieves state of storing INITiate readings

Path to measure control Preset and make capacitance measurement Make a continuity measurement Path to measure current Make a dc current measurement

Make an ac current measurement

Make a diode measurement Make a frequency measurement Make a 4-wire resistance measurement

Make a period measurement

Make a 2-wire measurement

Make a 4-wire temperature measurement Make a 2-wire temperature measurement Path to voltage measurements Make an ac voltage measurement

Make a dc voltage measurement

Make a dc voltage ratio measurement

Digital Multimeter

Table 12. Measurement Configuration Command Summary

[1]

Command

Description

Supported SCPI Commands

[SENSe:] FUNCtion[1/2] “CAPacitance” FUNCtion[1/2] “CONTinuity” FUNCtion[1/2] “CURRent:AC” FUNCtion[1/2] “CURRent:DC” FUNCtion[1/2] “DIODe” FUNCtion[1/2] “FRESistance” FUNCtion[1/2] “FREQuency” FUNCtion[1/2] “PERiod” FUNCtion[1/2] “RESistance” FUNCtion[1/2] “TEMPerature:FRTD” FUNCtion[1/2] “TEMPerature:RTD” FUNCtion[1/2] “VOLTage:DC” FUNCtion[1/2] “VOLTage:AC” FUNCtion[1] “VOLTage:RATio” FUNCtion[1/2] ? FUNCtion2 “None” VOLTage :AC :BANDwidth {3|20|200|MINimum|MAXimum} :BANDwidth? :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum] [:DC]

Path to Meter configuration Select capacitance function Select continuity function Select ac current function Select dc current function Select diode function Select 4-wire resistance function Select frequency function Select period function Select 2-wire resistance function Select 4-wire temperature function Select 2-wire temperature function Select dc voltage function Select ac voltage function Select dc voltage ratio function Retrieve present measurement function Turn off secondary display Path to configure voltage measurement range Path to ac voltage range Select filter Retrieve present filter setting Set ac voltage range Disable/Enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for ac voltage measurement Retrieve ac voltage measurement resolution Path to dc voltage range

DMM4040/4050

Programmer Manual

Table 12. Measurement Configuration Command Summary (cont.)

[1]

Command

Description

:FILTer [:STATe] {OFF|ON} [:STATe]? :DIGItal [:STATe]{OFF|ON} [:STATe]? :IMPedance :AUTO {OFF|ON} :AUTO? :NPLCycles {0.02|0.2|1|10|100| MINimum|MAXimum} :NPLCycles? [MINimum|MAXimum] :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum] CURRent :AC :BANDwidth {3|20|200|MINimum|MAXimum} :BANDwidth? :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum] [:DC] :FILTer [:STATe] {OFF|ON} [:STATe]? :DIGItal [:STATe]{OFF|ON} [:STATe]? :NPLCycles {0.02|0.2|1|10|100| MINimum|MAXimum} :NPLCycles? [MINimum|MAXimum] :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum] RESistance :FILTer [:STATe] {OFF|ON} [:STATe]? :DIGItal [:STATe]{OFF|ON} [:STATe]?

Path to analog filter Activates or deactivates 3-pole analog filter Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Path to input impedance selection Turn auto-impedance mode off or on Retrieve present setting of auto impedance Set integration time for selected function

Retrieve integration time for selected function Set dc voltage range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for dc voltage measurement Retrieve dc voltage measurement resolution Path to configure current measurement range Path to ac current range Select filter Retrieve present filter setting Set ac current range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for ac current measurement Retrieve ac current measurement resolution Path to dc current range Path to analog filter Set analog filter off or on Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Set integration time for selected function

Retrieve integration time for selected function Set dc current range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for dc current measurement Retrieve dc current measurement resolution Path to 2–wire resistance measurement range Path to analog filter Set the analog filter off or on Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting

Digital Multimeter

Table 12. Measurement Configuration Command Summary (cont.)

[1]

Command

Description

Supported SCPI Commands

:NPLCycles {0.02|0.2|1|10|100| MINimum|MAXimum} :NPLCycles? [MINimum|MAXimum] :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum} FRESistance :FILTer :STATe {OFF|ON} :STATe? :DIGItal [:STATe]{OFF|ON} [:STATe]? :NPLCycles {0.02|0.2|1|10|100| MINimum|MAXimum} :NPLCycles? [MINimum|MAXimum] :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum} FREQuency :APERture {0.01|0.1|1|MINimum|MAXimum} :APERture? [MINimum|MAXimum] :VOLTage :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] PERiod :APERture {0.01|0.1|1|MINimum|MAXimum} :APERture? [MINimum|MAXimum] :VOLTage :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] CAPacitance :RANGe {<range>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :RANGe? [MINimum|MAXimum] :RESolution {<resolution>|MINimum|MAXimum} :RESolution? [MINimum|MAXimum} TEMPerature :RTD :ALPHa <alpha value>

Set integration time for selected function

Retrieve integration time for selected function Set resistance measurement range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for resistance measurement Retrieve resistance measurement resolution Path to frequency measurement range Set aperture time for frequency function Retrieve aperture time for frequency function Path to frequency range configuration Set frequency measurement range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Path to period measurement range Set aperture time for period function Retrieve aperture time for period function Path to period range configuration Set period measurement range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Path to capacitance measurement range Set capacitance measurement range Disable/enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for capacitance measurement Retrieve capacitance measurement resolution Path to temperature measurement Path to 2-wire temperature measurement Set RTD alpha parameter

DMM4040/4050

Programmer Manual

Table 12. Measurement Configuration Command Summary (cont.)

[1]

Command

Description

:ALPHa? :NPLCycles {0.02|0.2|1|10|100| MINimum|MAXimum} :NPLCycles? [MINimum|MAXimum] :R0 <R0 value> :R0? :TYPe {PT100_385|PT100_392|CUST1} :TYPe?

:FRTD :ALPHa <alpha value> :ALPHa? :NPLCycles {0.02|0.2|1|10|100| MINimum|MAXimum} :NPLCycles? [MINimum|MAXimum] :R0 <R0 value> :R0? :TYPe {PT100_385|PT100_392|CUST1} :TYPe?

FILTer [:DC] [:STATe] {OFF|ON} [:STATe]? :DIGital [:STATe]{OFF|ON} [:STATe]?

Retrieve the present RTD alpha parameter Set integration time for selected function

Retrieve integration time for selected function Set resistance at 0 °C Retrieve present 0 °C resistance setting Set the type of RTD Retrieve the present RTD type (385|CUSTOM)

Path to 4-wire temperature measurement Set RTD alpha parameter Retrieve the present RTD alpha parameter Set integration time for selected function

Retrieve integration time for selected function Set resistance at 0 °C Retrieve present 0 °C resistance setting Set the type of RTD Retrieve the present RTD type (385|CUSTOM)

Path to filter selection Path to analog filter Set analog filter off or on for dc functions Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting

DETector :BANDwidth {3|20|200|MINimum|MAXimum} :BANDwidth? [MINimum|MAXimum]

ZERO :AUTO {OFF|ONCE|ON} :AUTO?

INPut :IMPedance :AUTO {OFF|ON} :AUTO?

ROUTe :TERMinals?

[1] Default parameters are shown in bold

Table 13. RS-232 Interface Command Summary

Command Description

SYSTem :LOCal :REMote :RWLock

Path to ac filter selection Set the ac input signal filter Retrieve the present ac filter setting

Path to configuring the autozero mode Set the autozero mode Retrieve the present autozero mode

Path to input impedance Path to input impedance configuration Disable/enable auto input impedance select Retrieve auto input impedance mode

Path to input terminal selection Retrieve input terminal selection (front or rear)

Path to RS-232 Interface commands Set Meter to local mode Set Meter to remote mode for RS-232 operation Set Meter to remote mode (lock out front panel)

Digital Multimeter

Table 14. Status Reporting Command Summary

Command Description

Supported SCPI Commands

*CLS

*ESE <enable value> *ESE?

*ESR?

*OPC

*OPC?

*PSC {0|1} *PSC? *SRE <enable value> *SRE?

*STB?

SYSTem :ERRor?

STATus :PRESet :QUEStionable :ENABle <enable value> :ENABle? :EVENt?

Clear status byte summary and all event registers

Enable bits in standard event register Retrieve standard event enable register

Retrieve standard event register

Set Operation Complete bit in standard event register Returns “1” in output buffer after command exec.

Power-on status clear Retrieve power-on status clear setting Enable bits in status byte register Retrieve bits in status byte register

Retrieve the status byte summary register

Path to meter’s error queue Retreive meter’s error queue

Path to meter’s status system Clear questionable data enable register Path to questionable data register Enable bits in questionable data enable register Retrieve questionable data register Retrieve questionable data enable register

DMM4040/4050

Programmer Manual

Command

Table 15. System-Related Command Summary

[1]

Description

FETCh[1|2|3]?

READ?

DISPlay {OFF|ON} :TEXT <quoted string> :CLEar :TEXT?

DISPlay?

SYSTem :BEEPer :STATe {OFF|ON}

:STATe? :DATE <mm/dd/yyy> :DATE? :ERRor? :ERRor:BEEPer {OFF|ON} :ERRor:BEEPer? :TIME <hh:mm:ss> :TIME? :VERSion?

DATA :POINts?

Transfer stored readings to output buffer

Set trigger system to ‘wait-for-trigger’

Turn display off or on Write message to display Clear message from display Retreive displayed message

Retrieve display setting

Path to system controls Issue a single beep Disable/enable beeper for limit, and diode testing Retrieve state of beeper Sets the Meter’s date Retrieves the Meter’s date Retrieve meter’s error queue Enable/disable beeper for errors Retrieve beeper state for errors Sets the Meter’s time Retrieves the Meter’s time Retrieve meter’s SCPI version

Path to meter’s memory Retrieve the number of stored readings

*RST

IDN [ON|OFF], [Quoted String]

*IDN?

L1 L2 L3

Reset Meter to its power-on state

Enables or disables a secondary indentification defined by the quoted string. When disabled, *IDN? will return the indentification set by the Meter’s manufacturer.

Retrieve meter’s identification string

Set the command language to DMM4040/4050 Set the command language to Fluke 45 Set the command language to Fluke 8842A

[1] Default parameters are shown in bold

Digital Multimeter

Table 16. Triggering Command Summary

Command

[1]

Description

Supported SCPI Commands

INITiate

DATA

:FEED RDG_STORE, {“CALCulate”|” ”} :FEED?

READ?

SAMPle :COUNt {<value>|MINimum|MAXimum} :COUNt? [MINimum|MAXimum]

TRIGger :COUNt {<value>|MINimum|MAXimum|INFinite} :COUNt? [MINimum|MAXimum] :DELay {<seconds>|MINimum|MAXimum} :AUTO {OFF|ON} :AUTO? :DELay? [MINimum|MAXimum] :SOURce {Bus|IMMediate|EXTernal} :SOURce?

[1] Bold type denotes default parameter.

[1]

SCPI Command Details

All SCPI commands recognized by the Meter are listed in the following sections along with description and syntax rules.

Set trigger system to wait-for-trigger

Path to storing readings taken with INITiate command Enables/disables storing of INITiate readings Retrieves state of storing INITiate readings

Set trigger system to wait-for-trigger

Path to sample count Set number of samples per trigger Retrieve sample count

Path to trigger control Set the number of triggers Meter will accept Retrieve the number of tiggers Meter will accept Set the delay between trigger and measurement Disable/Enable automatic trigger delay Retrieve automatic trigger delay status Retreive present trigger delay value Set meter’s trigger source Retrieve the meter’s present trigger source

DMM4040/4050

Programmer Manual

Using the MEASure? Command

MEASure[:SCALar][:<function>]?[<range> or <RTD type> or <low current> [,<resolution> or <high voltage>]]

The MEASure? command provides the quickest and simplest program method for getting the Meter to make a single measurement through remote control. However, MEASure? does not provide control over all possible parameters associated with a measurement function. With the exception of function, range, and resolution, the MEASure? command does not allow changing settings before the measurement is taken. Instead, the Meter uses predefined settings for each function (See Table 17) and makes a measurement as soon as the command is received. The measurement is immediately sent to the output buffer.

A MEASure? command is the same as using a CONFigure command followed by the READ? Command.

Description Sets the Meter function with the preset parameters (See Table 17), and

makes the measurement using the specified range and resolution. The reading is placed in the output buffer. For the temperature function, the range variable is replaced by the RTD type variable.

Note

The dc portion of the function keyword is optional, as is the VOLTage portion. For instance, MEAS:AC? will be interpreted by the Meter as meaning Volts ac function.

Parameters <function> = CAPacitance Capacitance

CURRent:AC AC current CURRent:DC DC current VOLTage:AC AC voltage VOLTage:DC DC voltage VOLTage:DC:RATio DC voltage ratio

[1]

[7]

RESistance 2-wire resistance FRESistance 4-wire resistance FREquency Frequency PERiod Period TEMPerature:RTD 2-wire temperature TEMPerature:FRTD 4-wire temperature DIODe Diode CONTinuity Continuity

[5]

[3]

[2]

[6]

[4] [4]

<range> = a number between the upper and lower limits of the

function. MIN Lowest range of the function MAX Highest range of the function DEF Autorange

<low current> = ON or 1 Sets diode current to 0.1 mA OFF or 0 Sets diode current to 1 mA

<high voltage> ON or 1 Sets diode voltage to 10 V OFF or 0 Sets diode voltage to 5 V.

<resolution> = a number in the same units, not in number of digits, as

the measurement function,. MIN Smallest value acceptable MAX Largest value acceptable DEF 5½ digits

Digital Multimeter

Supported SCPI Commands

Note

Issuing a MEASure? command without specifying a function, puts the Meter into volts dc and triggers a measurement. You must specify a range to use a resolution parameter.

Example MEAS:volt:ac? 10 = Returns a measurement after configuring the

Meter for volts ac and setting the range to the 10 volt range.

MEAS:diod? ON = Sets diode function using low current and returns

the diode measurement. 9.90000000E+37 is the value returned for an open diode.

Notes [1] For ac measurements, resolution is fixed at 6½ digits. The resolution

parameter only affects the front panel display.

[2] For frequency measurements, the multimeter uses one “range” for all

inputs between 3 Hz, and 300 kHz. With no input signal applied, frequency measurements return zero.

[3] For period measurements, the multimeter uses one “range” for all

inputs between 0.33 seconds, and 3.3 μsec. With no input signal applied, period measurements return zero.

[4] The range and resolution are fixed for temperature measurements.

However, placing PT100_385 or PT100_392 into the range field will set the RTD type. Placing CUST1 into the range field will cause the Meter to use the values set into the R

[5] The range and resolution are fixed for diode test: 10 Vdc range and 5½

digits. When set to ON, the low current parameter sets the diode test current to 0.1 mA. When OFF, the current is 1 mA. When set to ON, the high voltage parameter sets the diode test voltage to 10 volts. When OFF, the voltage is 5 volts. To specify a diode test voltage, you must also include ON or OFF for the low current parameter.

[6] The range and resolution are fixed for continuity tests: 1 kΩ range and

5½ digits.

[7] DC measurement voltage divided by dc reference voltage. For dc ratio,

connect the reference HI/LO to the HI/LO sense terminals of the Meter and the measurement voltage to the HI/LO input terminals of the Meter. Note the specified measurement range applies to the input terminals only.

For best results in RATIO, the two input commons must be shorted at the Meter terminals. The analog filter (AFLTR) should be off.

Using the CONFigure Command

The CONFigure command allows more configuration control than the MEASure command. As with the MEASure command, the CONFigure command presets the Meter’s parameters for the desired configuration (See Table 17). However, a measurement does not start automatically, and therefore affords the opportunity to change measurement parameters prior to triggering a measurement.

Note

and Alpha parameters.

The CONFigure command is very useful when most of the parameters preset by CONFigure are what you want and you only need to change one or two parameters. The

DMM4040/4050

Programmer Manual

CONFigure[:SCALar][:<function>] [<range |MIN|MAX|DEF> or <RTD type> or <low current>][,<resolution |MIN|MAX|DEF> or <high voltage>]]

SENSe:FUNCtion command provides a means of changing a function’s parameters. Other commands, such as INPut, SENSe, CALCulate, and TRIGger allow for more detailed control of the Meter’s parameters.

The CONFigure command does not initiate a measurement and will need to be followed by READ? command, or the INITiate and FETCh? commands.

Description Sets the Meter function with the preset parameters (See Table 17) and

configure the Meter using the specified range and resolution. This command must be followed by a READ? command, or the INITiate and FETCh? commands to cause the Meter to take a measurement. For the temperature function, the range variable is replaced by the RTD type variable.

Note

The dc portion of the function keyword is optional, as is the VOLTage portion. For instance, CONF:AC will be interpreted by the Meter as meaning Volts ac function.

Parameters <function> = CAPacitance Capacitance

CURRent:AC AC current CURRent:DC DC current VOLTage:AC AC voltage VOLTage:DC DC voltage VOLTage:DC:RATio DC voltage ratio

[1]

[7]

RESistance 2-wire resistance FRESistance 4-wire resistance FREquency Frequency PERiod Period TEMPerature:RTD 2-wire temperature TEMPerature:FRTD 4-wire temperature DIODe Diode CONTinuity Continuity

[5]

[3]

[2]

[6]

[4] [4]

<range> = a number between the upper and lower limits of the

function. MIN Lowest range of the function MAX Highest range of the function DEF Autorange

<low current> = ON or 1 Sets diode current to 0.1 mA OFF or 0 Sets diode current to 1 mA.

<low voltage> = ON or 1 Sets diode voltage to 5 volts OFF or 0 Sets diode voltage to 10 volts.

<resolution> = a number in the same units, not in number of digits, as

the measurement function,. MIN Smallest value acceptable MAX Largest value acceptable DEF 5½ digits

Note

You must specify a range whenever specifying a resolution parameter.

Digital Multimeter

Supported SCPI Commands

Notes [1] For ac measurements, resolution is fixed at 6½ digits. The resolution

parameter only affects the front panel display.

[2] For frequency measurements, the Meter uses one range for all inputs

between 3 Hz, and 300 kHz. With no input signal applied, frequency measurements return zero.

[3] For period measurements, the Meter uses one range for all inputs

between 0.33 seconds, and 3.3 μsec. With no input signal applied, period measurements return zero.

[4] The range and resolution are fixed for temperature measurements.

However, placing PT100_385 or PT100_392 into the range field will set the RTD type. Placing CUST1 into the range field will cause the Meter to use the values set into the R

and Alpha parameters.

[5] The range and resolution are fixed for diode test: 10 Vdc range and 5½

[6] The range and resolution are fixed for continuity tests: 1 kΩ range and

5½ digits.

[7] DC measurement voltage divided by dc reference voltage. For dc ratio,

Note

For best results in RATIO, the two input commons must be shorted at the Meter terminals. The analog filter (AFLTR) should be off.

Table 17. Preset Conditions for the MEASure? and CONFigure Commands

Parameter Setting

AC Filter (DET:BAND) 20 Hz

Autozero (ZERO:AUTO) OFF if NPLC <1, ON if NPLC >=1

DC Digital Filter ON

Input Impedance (INP:IMP:AUTO) OFF

Samples per trigger (SAMP:COUN) 1

Trigger count (TRIG:COUN) 1

Trigger delay (TRIG:DEL) Automatic

Trigger source (TRIG:SOUR) Internal (immediate)

Math Function (CALCulate subsystem) OFF

DMM4040/4050

Programmer Manual

Setting Range and Resolution Parameters

Using the READ? Command

READ?

The MEASure? and CONFigure commands incorporate parameters for setting the Meter’s function, its range, and its resolution. Placing the input signal’s expected amplitude into the range value causes the Meter to select a range appropriate for the supplied signal amplitude.

Although the frequency and period functions use a single range for all inputs between 3 Hz and 300 kHz, it is necessary to specify a range whenever specifing a resolution setting for these functions. When specifying resolution, specify it in the units of the function instead of number of digits. For ac or dc volts, specify the resolution in volts. The resolution specification for frequency is in hertz.

Note

A range parameter is required when specifying the resolution parameter.

Description READ? causes the Meter to take a measurement the next time the trigger

condition is met after the READ? command is received. After the measurement is taken, the reading is placed in the output buffer. The READ? command will not cause readings to be stored in the Meter’s internal memory.

All measurements are sent to the output buffer until the buffer becomes full, at which point the Meter stops taking measurements. To keep the measurements running, measurements must be continually read out of the output buffer.

Always process the reading(s) from the output buffer after each READ? command. Failure to do so may cause some of the data from the previous READ? command to appear in the response for the last READ? command. For those times the buffer cannot be read after a READ? command, send a device clear (DC1) before issuing another READ? command.

Using the INITiate Command

Once the Meter has been configured for a measurement, the INITiate command causes the Meter to take a measurement when the trigger conditions have been met. The measurement reading(s) are placed in the Meter’s internal memory (up to 5,000 readings) to be read at a later time using the FETCh? command.

With one exception, the INITiate command stops the Meter from accepting any other remote commands until the Meter has completed both taking the measurement and storing the reading. The exception occurs when the trigger source is set to BUS with the TRIGger:SOURce command. Under this condition, the *TRG command or the IEEE-488 Group Execute Trigger will be processed to start the measurement.

Using the FETCh? Command

To process readings from the Meter’s internal memory to the output buffer, send the Meter a FETCh? command. With readings in the output buffer, a bus controller can then retrieve the readings over the bus.

Note

Digital Multimeter

Supported SCPI Commands

Using the SENSe Subsystem to Configure the Meter

Setting Meter functions and function parameters are controlled through the SENSe subsystem of commands. Both primary and secondary display functions are set using the FUNCtion commands. The parameters of each Meter function are also controlled through this subsystem of commands.

[SENSe]:FUNCtion[1/2] "<function>"

Description Sets the Meter to the measurement function listed in the function

parameter. The function must be enclosed in quotes in the command string (e.g. FUNC “VOLT:DC”).

[1]

Parameters [1/2]

= Use 1 for primary display, and 2 for secondary display

<function> = CAPacitance Capacitance CURRent:AC AC current CURRent:DC DC current VOLTage:AC AC voltage VOLTage:DC DC voltage VOLTage:DC:RATio DC voltage ratio

[3]

RESistance 2-wire resistance FRESistance 4-wire resistance FREQuency Frequency PERiod Period TEMPerature:RTD 2-wire temperature TEMPerature:FRTD 4-wire temperature DIODe Diode CONTinuity Continuity NONe

[2]

Turn off secondary display

Examples FUNC “VOLT:DC” Sets the Meter to volts dc FUNC1 “VOLT:DC”; FUNC2 “VOLT:AC” Dual function command Query FUNCtion[1/2]? Query measurement function

FUNC2? will return the measurement mode selected for the secondary display (assuming its been enabled using the FUNC2 command). FUNC1? or FUNC? will return the measurement mode for the primary display.

Notes [1] Using FUNC without a 1 or 2 will default to 1 for the primary display. [2] Valid only when used with FUNC2.

[3] Valid only when used with FUNC or FUNC1.

[SENSe:]<function>

The SENSe subsystem allows configuring the Meter’s functions. Parameters <function> = CAPacitance Capacitance

CURRent:AC AC current CURRent[:DC] DC current VOLTage:AC AC voltage VOLTage[:DC] DC voltage RESistance 2-wire resistance FRESistance 4-wire resistance FREQuency Frequency

Note

DMM4040/4050

Programmer Manual

[SENSe:]<function>:RANGe(?) <n>

PERiod Period TEMPerature:RTD 2-wire temperature TEMPerature:FRTD 4-wire temperature DIODe Diode CONTinuity Continuity NONe

[1]

Turn off secondary display

Notes [1] Valid only when used with FUNC2.

Description Sets the range according to the value supplied for n, of the Meter function

specified in the variable <function>. Not having selectable ranges, an error is returned when using temperature, diode test, or continuity as the function with the RANGe command. This setting is stored in volatile memory.

For the frequency and period functions, the range command value refers to the signal’s input voltage and not the range of the frequency or period measurement. Also, the word VOLTage must follow the function before the RANGe command. See examples below.

Parameters <n> = value of reading Expected reading in volts, amps or ohms

MINimum Lowest range MAXimum Highest range

Examples VOLT:RANG 10 Sets the Meter’s dc volts to the 10 volt range. CURR:AC:RANG 1e-3 Sets the Meter’s ac amps to the 100 mA range. RES:RANG 20e3 Sets the Meter’s ohms to the 100 kΩ range. FREQ:VOLT:RANG 5 Sets the voltage input range to the 10 volt range

for frequency measurements.

Query VOLT:RANG? Returns the set range for dc volts. VOLT:RANG? MIN Returns the minimum range of the dc volts

function. (1.00000000E-01 or 100 mV)

RES:RANG? MAX Returns the maximum range of the 2-wire

resistance function. (1.00000000E+09 or 1 GΩ)

[SENSe:]<function>:RANGe:AUTO(?) {OFF|ON}

Description Switches the Meter between autoranging and manual ranging. Not having

selectable ranges, an error is returned when the temperature, diode test, or continuity function is used with the RANGe:AUTO function. This setting is stored in volatile memory.

For the frequency and period functions, the RANGe:AUTO command refers to the signal’s input voltage and not the range of the frequency or period measurement. Also, the word VOLTage must follow the function before the RANGe command. See examples below.

Note

Autorange thresholds are set for down range with readings <11 % of range and up range with readings >120 % of range.

Examples VOLT:RANG:AUTO ON Sets the Meter’s dc volts to autorange. CURR:AC:AUTO OFF Sets the Meter’s ac amps to manual ranging. FREQ:VOLT:RANG ON Sets the Meter’s voltage input to autorange

while making a frequency measurement.

Digital Multimeter

Supported SCPI Commands

Query VOLT:RANG:AUTO? Returns the dc volts autorange state. A zero

means off and a one means on.

[SENSe:]<function>:RESolution(?) <n>

Description Sets the resolution according to the value supplied for n, for the Meter

function specified in the variable <function>. Resolution is specified in the same units as the function. i.e., volts for the volts ac and dc functions. This setting is stored in volatile memory.

For functions that do not have selectable ranges, an error is returned when using frequency, period, temperature, diode test, or continuity as the function in the RESolution command.

Parameters <n> = resolution value Desired resolution in volts, amps, ohms, or

farads. MIN Highest resolution MAX Lowest resolution

Examples VOLT:RES 1e-4 Sets the dc volts resolution to 100 μV. CURR:AC:RES 1e-8 Sets the ac amps resolution to 10 nA.

Query VOLT:RES? Returns the set resolution for dc volts. VOLT:RES? MIN Returns the minimum resolution of the dc volts

function.

[SENSe:]<function>:NPLCycles(?) <n>

Description Sets the Meter’s integration time for the function specified in <function>,

based on the number of power line cycles. This setting is stored in volatile memory.

This command is only valid for dc voltage, dc current, temperature, and resistance (2-wire and 4-wire) functions.

Parameters <n> = 0.02 to 100 sets integration time to a preset value of a

power line cycle (0.02, 0.2, 1, 10, and 100) MIN 0.02 NPLC MAX 100 NPLC

Examples VOLT:DC:NPLC .2 Sets the dc volts integration time to 0.2 of a

power line cycle.

Query VOLT:NPLC? Returns the integration time for dc volts. CURR:NPLC? MIN Returns the minimum integration time for the dc

current function.

[SENSe:]TEMPerature:[TRANsducer:]<subfunction>:R0(?) <n>

Description Sets the resistance at zero degrees C specified by <n> for the R0 parameter

of the temperature function. This setting is stored in volatile memory.

Parameters <subfunction> = RTD 2-wire RTD FRTD 4-wire RTD

<n> = 0 to 1010 Resistance at 0 °C

Examples TEMP:RTD:R0 120 Sets the resistance at 0 °C to 120 ohms. Query TEMP:RTD:R0? Returns the set resistance at 0 °C.

DMM4040/4050

Programmer Manual

[SENSe:]TEMPerature:[TRANsducer:]<subfunction>:TYPe(?) <n>

[SENSe:]TEMPerature:[TRANsducer:]<subfunction>:ALPHa(?) <n>

Description Sets the RTD type for the temperature function. This setting is stored in

volatile memory.

Parameters <subfunction> = RTD 2-wire RTD FRTD 4-wire RTD

<n> = PT100_385 Sets the RTD type to PT100 385 (R0 to

100Ω and Alpha to 0.00385055)

PT100_392 Sets the RTD type to PT100 392 (R0 to

100Ω and Alpha to 0.00391600

CUST1 Sets the RTD type to be set by R0 and Alpha

settings.

Examples TEMP:RTD:TYP PT100_385 Sets the RTD type to PT100 385. Query TEMP:RTD:TYP? Returns 385 or CUSTOM.

Description Sets the alpha variable for the temperature function. This setting is stored

in volatile memory.

Parameters <subfunction> = RTD 2-wire RTD FRTD 4-wire RTD

<n> = .00374 to .00393 Sets the alpha parameter.

Examples TEMP:RTD:ALPH 0.00392 Sets the alpha parameter to 0.00392. Query TEMP:RTD:ALPH? Returns the alpha setting of the temperature

[SENSe:]FREQuency:APERature(?) <n>

Description Sets the gate time for the frequency function to the value specified by <n>.

This setting is stored in volatile memory.

Parameters <n> = 0.01 Gate time of 10 ms (4½ digits)

0.1 (default) Gate time of 100 ms (5½ digits) 1 Gate time of 1 second (6½ digits) MIN Gate time of 10 ms (4½ digits) MAX Gate time of 1 second (6½ digits)

Examples FREQ:APER 0.1 Sets the frequency measurement gate time to 100

Query FREQ:APER? Returns the gate time for the frequency function.

[SENSe:]PERiod:APERature(?) <n>

Description Sets the gate time for the period function to the value specified by <n>.

This setting is stored in volatile memory.

function.

ms.

Parameters <n> = 0.01 Gate time of 10 ms (4½ digits)

0.1 (default) Gate time of 100 ms (5½ digits) 1 Gate time of 1 second (6½ digits) MIN Gate time of 10 ms (4½ digits) MAX Gate time of 1 second (6½ digits)

Digital Multimeter

Supported SCPI Commands

Examples PER:APER 0.1 Sets the period measurement gate time to 100

ms.

Query PER:APER? Returns the gate time for the period function.

[SENSe:]CURRent:AC:BANDwidth(?) <n>

Description Sets the appropriate filter for the frequency specified by <n>. This setting

is stored in volatile memory.

Parameters <n> = 3 Selects slow filter 20 (default) Selects medium filter 200 Selects fast filter MIN Selects slow filter MAX Selects fast filter

Examples CURR:AC:BAND 200 Sets the filter for ac current to fast. Query CURR:AC:BAND? Returns the filter selection.

[SENSe:]VOLTage:AC:BANDwidth(?) <n>

Description Sets the appropriate filter for the frequency specified by <n>. This setting

is stored in volatile memory.

Parameters <n> = 3 Selects slow filter 20 (default) Selects medium filter 200 Selects fast filter MIN Selects slow filter MAX Selects fast filter

Examples VOLT:AC:BAND 20 Sets the filter for ac voltage to medium. Query VOLT:AC:BAND? Returns the filter selection.

[SENSe:]DETector:BANDwidth(?) <n>

Description Sets the appropriate filter for the frequency specified by <n>. This setting

is stored in volatile memory and sets the filter for all functions that use an ac filter.

Parameters <n> = 3 Selects slow filter 20 Selects medium filter 200 Selects fast filter MIN Selects slow filter MAX Selects fast filter

Examples DET:BAND 20 Sets the filter to medium. Query DET:BAND? Returns the filter selection.

DET:BAND? MAX Returns +2.00000000E+02 to indicate the fast

filter.

[SENSe:]FILTer[:DC][:STATe](?) <n>

Description Activates or deactivates the 3-pole analog filter to improve noise immunity

for dc functions. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the analog dc filter off. ON or 1 Turns the analog dc filter on.

DMM4040/4050

Programmer Manual

[SENSe:]FILTer[:DC]:DIGital[:STATe](?) <n>

Examples FILT ON Turns the analog dc filter on. Query FILT? Returns the analog dc filter setting.

Note

Since the corner frequency of the analog filter is about 8 Hz, the filter does not add much rejection until frequencies are significantly higher than that.

Description Activates or deactivates the digital averaging filter to improve noise

immunity for dc functions. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the digital averaging filter off. ON or 1 Turns the digital averaging filter on.

Examples FILT:DIG ON Turns the digital averaging filter on. Query FILT:DIG? Returns the digital averaging filter setting. (0 =

OFF and 1 = ON)

[SENSe:]VOLTage[:DC]:FILTer[:STATe](?) <n>

Description Activates or deactivates the 3-pole analog filter to improve noise immunity

for dc voltage functions. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the analog dc voltage filter off. ON or 1 Turns the analog dc voltage filter on.

Examples VOLT:FILT ON Turns the analog dc voltage filter on. Query VOLT:FILT? Returns the analog dc voltage filter setting.

[SENSe:]VOLTage[:DC]:FILTer:DIGital[:STATe](?) <n>

Description Activates or deactivates the digital averaging filter to improve noise

immunity for dc voltage functions. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the digital averaging filter off. ON or 1 Turns the digital averaging filter on.

Examples VOLT:FILT:DIG ON Turns the digital averaging filter on. Query VOLT:FILT:DIG? Returns the digital averaging filter setting. (0 =

OFF and 1 = ON)

[SENSe:]CURRent[:DC]:FILTer[:STATe](?) <n>

Description Activates or deactivates the 3-pole analog filter to improve noise immunity

for dc current functions. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the analog dc current filter off. ON or 1 Turns the analog dc current filter on.

Examples CURR:FILT ON Turns the analog dc current filter on. Query CURR:FILT? Returns the analog dc current filter setting. (0 =

OFF and 1 = ON)

Digital Multimeter

Supported SCPI Commands

[SENSe:]CURRent[:DC]:FILTer:DIGital[:STATe](?) <n>

Description Activates or deactivates the digital averaging filter to improve noise

immunity for dc current functions. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the digital averaging filter off. ON or 1 Turns the digital averaging filter on.

Examples CURR:FILT:DIG ON Turns the digital averaging filter on. Query CURR:FILT:DIG? Returns the digital averaging filter setting. (0 =

OFF and 1 = ON)

[SENSe:]RESistance[:DC]:FILTer[:STATe](?) <n>

Description Activates or deactivates the 3-pole analog filter to improve noise immunity

for the 2-wire resistance function. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the analog 2-wire resistance filter off. ON or 1 Turns the analog 2-wire resistance filter on.

Examples RES:FILT ON Turns the analog 2-wire resistance filter on. Query RES:FILT? Returns the analog 2-wire resistance filter

setting. (0 = OFF and 1 = ON)

[SENSe:]RESistance[:DC]:FILTer:DIGital[:STATe](?) <n>

Description Activates or deactivates the digital averaging filter to improve noise

immunity the 2-wire resistance dc function. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the digital averaging filter off. ON or 1 Turns the digital averaging filter on.

Examples RES:FILT:DIG ON Turns the digital averaging filter on. Query RES:FILT:DIG? Returns the digital averaging filter setting. (0 =

OFF and 1 = ON)

[SENSe:]FRESistance[:DC]:FILTer[:STATe](?) <n>

Description Activates or deactivates the 3-pole analog filter to improve noise immunity

for the 4-wire resistance function. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the analog 4-wire resistance filter off. ON or 1 Turns the analog 4-wire resistance filter on.

Examples FRES:FILT ON Turns the analog 4-wire resistance filter on. Query FRES:FILT? Returns the analog 4-wire resistance filter

setting. (0 = OFF and 1 = ON)

DMM4040/4050

Programmer Manual

[SENSe:]FRESistance[:DC]:FILTer:DIGital[:STATe](?) <n>

[SENSe:]UNIT:TEMPerature(?) <units>

Description Activates or deactivates the digital averaging filter to improve noise

immunity for the 4-wire resistance function. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns the digital averaging filter off. ON or 1 Turns the digital averaging filter on.

Examples FRES:FILT:DIG ON Turns the digital averaging filter on. Query FRES:FILT:DIG? Returns the digital averaging filter setting. (0 =

OFF and 1 = ON)

Description Sets the temperature units for the temperature function. This setting is

stored in volatile memory.

Parameters <units> = Cel Sets temperature units to Celsius Far Sets temperature units to Fahrenheit

Kel Sets temperature units to Kelvin

Examples UNIT:TEMP C Sets temperature units to Celsius. Query UNIT:TEMP? Returns the temperature units setting. (C =

Celsius, F = Fahrenheit, and K = Kelvin)

[SENSe:]ZERO:AUTO <n>

Description Activates (default) or deactivates the autozero mode. This setting is stored

in volatile memory.

Parameters <n> = OFF Turns Autozero mode off. ON Turns autozero mode on. ONCE Initiates a zero measurement immediately.

Examples ZERO:AUTO ON Turns autozero mode on. Query ZERO:AUTO? Returns the state of the autozero mode. (0 = OFF

and 1 = ON)

[SENSe:]VOLTage[:DC]:IMPedance:AUTO(?) <n>

Description Activates or deactivates (default) the automatic input impedance mode for

dc voltage measurements. With AUTO OFF, the input impedance is fixed at 10 MΩ for all ranges. With AUTO ON, the input impedance is set to >10 GΩ for the 100 mV, 1 V, and 10 V ranges. This setting is stored in volatile memory.

Parameters <n> = OFF or 0 Turns off automatic input impedance. ON or 1 Turns on automatic input impedance.

Examples VOLT:IMP:AUTO ON Turns on automatic input impedance.

Query VOLT:IMP:AUTO? Returns the state of the input impedance mode.

(0 = OFF and 1 = ON)

Digital Multimeter

Supported SCPI Commands

INPut:IMPedance:AUTO(?) <n>

Description Activates or deactivates (default) the automatic input impedance mode for

Parameters <n> = OFF or 0 Turns off automatic input impedance. ON or 1 Turns on automatic input impedance.

Examples IMP:AUTO ON Turns on automatic input impedance. Query IMP:AUTO? Returns the state of the input impedance mode.

(0 = OFF and 1 = ON)

ROUTe:TERMinals?

Description A query that returns the state of the front or rear panel input terminals

switch.

Examples ROUT:TERM? Returns “FRON” or “REAR”.

Programming for Math Operations

Of the five possible Meter math functions, only one can be enabled at a time. Once a math function is selected, it stays selected until the Meter is powered down, or another math function is set. A reset command received through the remote interface will also disable the math function. Presetting some math registers are possible.

Table 18 is a matrix indicating which math functions work with each Meter function. Selecting a math function that is not allowed with a Meter function causes math to be disabled. Selecting a math function that is not allowed after selecting an allowed math function will result in a “Setting Conflict” error.

Note

Math must be enabled before writing to the zero (null) or dB measurement registers.

Table 18. Allowed Math/Measurement Function Combinations

DCV ACV DCI ACI 2W 4W Freq Period Cont Diode Temp Cap

Null Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes

Average Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes

dB No Yes No No No No No No No No No No

dBm No Yes No No No No No No No No No No

Limit Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes

DMM4040/4050

Programmer Manual

CALCulate:FUNCtion(?) {NULL|DB|DBM|AVERage|LIMit}

CALCulate:STATe(?) <n>

Description Selects one of five math functions. This setting is stored in volatile

memory. Selecting a math function disables any math function which may have been set previously. For the selected math function to take effect, the CALCulate:STATe must be ON.

Parameters <n> = NULL Uses the present reading as an offset to zero

the returned reading. DB Selects the DB mode. DBM Selects the dBm mode. AVERage Selects the average mode LIMit Selects the Limit Testing mode.

Examples CALC:FUNC DBM Selects the dBm mode. Query CALC:FUNC? Returns the selected math function.

Description Activates or deactivates the math function selected with CALC:FUNC

command. This setting is stored in volatile memory.

Parameters <n> = ON or 1 Activates the math function set previously by

CALC:FUNC command. OFF or 0 Deactivates the math function.

Examples CALC:STAT ON Turns on the math function. Query CALC:STAT? Returns the state of the math function. (0 = OFF

CALCulate:AVERage:MINimum?

Description Retrieves the minimum value measured during a statistics operation. This

value is cleared whenever the Meter is powered off then back on, a statistics function is enabled, or the Meter receives a reset through the remote interface. This setting is stored in volatile memory.

Query CALC:AVER:MIN? Returns the minimum value of the statistics operation.

CALCulate:AVERage:MAXimum?

Description Retrieves the maximum value measured during a statistics operation. This

Query CALC:AVER:MAX? Returns the maximum value of the statistics operation.

CALCulate:AVERage:AVERage?

Description Retrieves the average value measured during a statistics operation. This

and 1 = ON)

Query CALC:AVER:AVER? Returns the average value of the statistics operation.

Digital Multimeter

Supported SCPI Commands

CALCulate:AVERage:COUNt?

Description Retrieves the number of measurements taken during a statistics operation.

This value is cleared whenever the Meter is powered off then back on, a statistics function is enabled, or the Meter receives a reset through the remote interface. This setting is stored in volatile memory.

Query CALC:AVER:COUN? Returns the count value of the statistics operation.

CALCulate:NULL:OFFSet(?) {<value>|MINimum|MAXimum}

Description Sets the offset value used for the zero function. Math operation must be

enabled to write to the zero offset register. This setting is stored in volatile memory.

Parameters <value> = 0 to 120 % of highest range. MINimum Sets offset register to -120 % of highest

range of selected function. MAXimum Sets offset register to 120 % of highest range

of selected function.

Examples CALC: NULL:OFFS 100 Sets zero offset register to 100. Query CALC:NULL:OFFS? Returns the zero offset register value.

CALCulate:DB:REFerence(?) {<value >|MINimum|MAXimum}

Description Sets the relative value used for the dB function. Math operation must be

enabled to write to the dB relative register. This setting is stored in volatile memory.

Parameters <value> = 0 to ±200 dBm. MINimum Sets dB relative register to -200 dBm.

MAXimum Sets dB relative register to 200 dBm.

Examples CALC:DB:REF 25 Sets dB relative register to 25 dBm. Query CALC:DB:REF? Retrieves the dB relative register value.

CALCulate:DBM:REFerence(?) {<value>|MINimum|MAXimum}

Description Sets the reference impedance for the dBm function. Math operation must

be enabled to write to the dBm reference impedance register. This setting is stored in volatile memory.

Parameters <value> = 2, 4, 6, 16, 50, 75, 90, 93, 100, 110, 124, 125, 135, 150, 250,

300, 500, 600 (default), 800, 900, 1000, 1200, or 8000 Ω.

MINimum Sets dBm reference impedance register to

50 Ω. MAXimum Sets dBm reference impedance register to

8000 Ω.

Examples CALC:DBM:REF 110 Sets dBm reference impedance register to

110 Ω.

Query CALC:DBM:REF? Retrieves the present dBm reference impedance

CALC:DBM:REF? MIN Returns 50 CALC:DBM:REF? MAX Returns 8000

DMM4040/4050

Programmer Manual

CALCulate:LIMit:LOWer(?) {<value >|MINimum|MAXimum}

CALCulate:LIMit:UPPer {<value >|MINimum|MAXimum}

Description Sets the lower limit value used for limit testing. This setting is stored in

volatile memory.

Parameters <value> = 0 to 120 % of highest range. MINimum Sets lower limit register to -120 % of highest

range of selected function. MAXimum Sets lower limit register to 120 % of highest

range of selected function.

Examples CALC:LIM:LOW 235 Sets lower limit register to 235. Query CALC: LIM:LOW? Retrieves the lower limit register value.

CALC:LIM:LOW? MIN Returns -120 % of highest range of selected

function.

CALC:LIM:LOW? MAX Returns 120 % of highest range of selected

function.

Description Sets the upper limit value used for limit testing. This setting is stored in

volatile memory.

Parameters <value> = 0 to 120 % of highest range. MINimum Sets upper limit register to -120 % of highest

MAXimum Sets upper limit register to 120 % of highest

Examples CALC:LIM:UPP -150 Sets upper limit register to -150. Query CALC:LIM:UPP? Retrieves the upper limit register value.

CALC:LIM:UPP? MIN Returns -120 % of highest range of selected

CALC:LIM:UPP? MAX Returns 120 % of highest range of selected

DATA:FEED RDG_STORE, <n>

Description Enables (default) or disables storing measurements in the Meter’s internal

memory when an INITiate command is executed. When enabled, 5,000 measurements are stored in the Meter’s internal memory when executing an INITiate command.

Note The MEASure? and CONFigure commands automatically

enable the storing of measurements.

Disabling the storage of readings may be beneficial when performing statistics operations. Minimum, maximum, and average values can be calculated without storing each measurement.

range of selected function.

function.

Note While readings are disabled, attempting to transfer readings to

the output buffer with a FETCh? command will generate an error.

Digital Multimeter

Supported SCPI Commands

Parameters <n> = “CALCulate” Enable the storing of measurements. “” Disable the storage of measurements.

Example DATA:FEED RDG_STORE, “CALC”.

DATA:FEED?

Description Retrieves the state of the reading store setting. Query DATA:FEED? Returns CALC or “”.

CALCulate:KMATh:MMFactor(?) <value>

Description Sets the value in the “m” register for the mx+b calculation. Parameters <value> = 0 to ±999.999999 Examples CALC:KMAT:MMF 37 Sets “m” register to 37. Query CALC: KMAT:MMF? Retrieves the “m” register value.

CALCulate:KMATh:MBFactor(?) <value>

Description Sets the value in the “b” register for the mx+b calculation. Parameters <value> = 0 to ±999.999999 Examples CALC:KMAT:MBF 37 Sets “b” register to 37. Query CALC: KMAT:MBF? Retrieves the “b” register value.

CALCulate:KMATh:MUNits(?) <name> = 3 characters using ‘A’ through ‘Z’

Description Sets the units for the mx+b calculation. Parameters <name> = A to ZZZ Up to three letters Examples CALC:KMAT:MUN VOL Sets units to “VOL”. Query CALC: KMAT:MUN? Retrieves the set units value.

CALCulate:KMATh:STATe(?) <n>

Description Enables or disables the mx+b calculation. Parameters <n> = ON or 1 Enables mx+b calculations.

OFF or 0 Disable mx+b calculations

Examples CALC:KMAT:STAT ON Enables mx+b calculations. Query CALC: KMAT:STAT? Retrieves the state of the mx+b calculation (0 =

OFF, 1 = ON).

Programming the Trigger System

The Meter is designed to provide extensive control over the triggering of a single measurement or series of measurements. One trigger can cause the Meter to take a single measurement or multiple measurements; up to 50,000 per trigger.

Operating the Meter remotely requires selecting one of three trigger methods: internal, external, or bus triggering. Once a source is selected, the Meter must be in a “wait-fortrigger” state before the trigger will start a measurement cycle.

Figure 4 shows the multimeter’s triggering system.

DMM4040/4050

Programmer Manual

Initiate Triggering

MEASure? READ? INITiate

Trigger Source

TRIGger:SOURce IMMediate TRIGger:SOURce EXTernal TRIGger:SOURce BUS Front-panel "Single" key

Triggering Delay

TRIGger:DELay

Sample (*) Annuniator

Idle

State

Wait-for-

Trigger

State

Delay

Measurement

Sample

Sample Count # 1

Trigger Count # 1

Figure 4. DMM4040/4050 Triggering System

The Meter can be put into a wait-for-trigger state remotely by sending it a MEASure?, READ?, or INITiate command. Once received by the Meter, it takes approximately 20

ms to setup the Meter and put it in to the wait-for-trigger state. Any triggers received during this set-up time are ignored.

Using the Triggering Commands

INITiate

Description Sets the Meter to the wait-for-trigger state in which the next trigger from

the selected source triggers a measurement cycle. Up to 5,000 measurements are placed into the Meter’s internal memory, where they can be retrieved with the FETCh? command.

Examples INIT Sets the Meter to the wait-for-trigger state.

dae02.eps

Digital Multimeter

Supported SCPI Commands

READ?

Description Sets the Meter in to the wait-for-trigger state where the next trigger from

the selected source triggers a measurement cycle. Measurements are sent directly to the output buffer.

Examples READ? Sets the Meter to the wait-for-trigger state.

DMM4040/4050

Programmer Manual

TRIGger:SOURce(?) {BUS|IMMediate|EXTernal}

TRIGger:DELay <n>

Description Sets the source from which the Meter will expect a measurement trigger. Parameters <n> = BUS Sets the Meter to expect a trigger through the

IEEE-488 bus or upon execution of a *TRG

command. IMMediate Selects Meter’s internal triggering system. EXTernal Sets the Meter to sense triggers through the

trigger jack on the rear panel of the Meter. Examples TRIG:SOUR BUS Sets the Meter to expect a trigger through the

IEEE-488 bus or upon execution of a *TRG command.

Query TRIG:SOUR? Retrieves the trigger source for which the Meter

has been set (BUS, IMM, or EXT).

Description Sets the delay between receiving a trigger and the beginning of

measurement cycle.

Parameters <n> = 0 to 3600 Delay specified in seconds. MINimum Delay set to 0 seconds. MAXimum Delay set to 3600 seconds.

Examples TRIG:DEL 14 Sets the trigger delay to 14 seconds. Query TRIG:DEL? Retrieves the amount of time set for a trigger

delay. TRIG:DEL? MIN Returns 0 seconds TRIG:DEL? MAX Returns 3600 seconds

TRIGger:DELay:AUTO <n>

Description Enables or disables automatic trigger delay. The amount of delay is set

based on selected function, integration time, and filter setting. When a specific trigger delay is set using the TRIG:DELAY <n> command, automatic trigger delay is disabled. This setting is stored in volatile memory.

Parameters <n> = ON or 1 Automatic trigger delay is enabled. OFF or 0 Automatic trigger delay is disabled.

Examples TRIG:DEL:AUTO ON Enables automatic trigger delay Query TRIG:DEL:AUTO? Retrieves the state of the automatic trigger delay

( 0 = OFF, 1 = ON).

SAMPle:COUNt {<value>|MINimum|MAXimum}

Description Sets the number of measurements the Meter takes per trigger. This setting

is stored in volatile memory.

Parameters <n> = 0 to 50,000 Number of measurements per trigger MINimum Number of measurements per trigger set to 1. MAXimum Number of measurements per trigger set to

50,000.

Examples SAMP:COUN 2450 Number of measurements per trigger set to

2,450.

Digital Multimeter

Supported SCPI Commands

Query SAMP:COUN? Retrieves the number of samples per trigger

presently set in the Meter. SAMP:COUN? MIN Returns 1 to indicate the minimum number of

samples the Meter will accept per trigger. SAMP:COUN? MAX Returns 50,000 to indicate the maximum number

of measurements the Meter will accept per

trigger.

TRIGger:COUNt <n>

Description Sets the number of triggers the Meter will take before switching to an idle

state. This setting is stored in volatile memory.

Parameters <n> = 0 to 50,000 Number of triggers before Meter becomes

idle. MINimum Number of triggers is set to 1. MAXimum Number of triggers is set to 50,000. INFinite Continuously accepts triggers. A device clear

is required to set the Meter to idle state after

INFinite has been set.

Examples TRIG:COUN 430 Number of triggers set to 430. Query TRIG:COUN? Retrieves the number of triggers presently set in

TRIG:COUN? MIN Returns 1 to indicate the minimum number of

TRIG:COUN? MAX Returns 50,000 to indicate the maximum number

Using System-Related Commands

FETCh[1/2]?

Description Moves measurements stored in the Meter’s internal memory to the output

buffer. FETCh1? or FETCh? returns measurements from the primary display. FETCh2? Returns readings from the secondary display.

Example FETCh2? Retrieves a single measurement from the Meter’s

FETCh3?

Description Retrieves the last measurement from the Meter's primary display. Unlike

the FETCh? or FETCh1? commands which require that the meter be first placed in the "wait for trigger" state using the INIT command to trigger a measurement or multiple measurements from the primary display, FETCh3? will return a single measurement from the primary display if there is one. If a measurement isn't available, the command is ignored.

the Meter. Returns 9.90000000E+37 if trigger count has been set to INFinite.

triggers the Meter will accept per trigger.

of triggers the Meter will accept per trigger.

internal memory that was taken by the secondary display if the secondary measurements are enabled.

Examples FETCh3? Retrieves the last measurement from the primary

display of the Meter.

DISPlay <n>

Description Enables or disables the Meter’s display. This setting is stored in volatile

memory.

DMM4040/4050

Programmer Manual

DISPlay:TEXT(?) <quoted string >

Parameters <n> = ON or 1 Enables the display. OFF or 0 Disables the display.

Examples DISP ON Enables the Meter’s display. Query DISP? Retrieves the state of the display ( 0 = OFF and 1

= ON).

Description Displays a message on the Meter’s display. This setting is stored in volatile

memory.

Note

The Meter must be remote before executing this command.

Parameters <quoted string> = Up to 12 characters. Additional characters are

truncated.

Examples DISP:TEXT “Hello” Hello is displayed in the Meter’s display. Query DISP:TEXT? Retrieves the text sent to the Meter in a

DISP:TEXT command.

DISPlay:TEXT:CLEar

Description Clears the displayed message on the Meter’s display. Examples DISP:TEXT:CLE Meter’s display message is cleared.

SYSTem:BEEPer

Description Causes the Meter to beep once. Examples SYST:BEEP Meter beeps.

SYSTem:BEEPer:STATe? <n>

Description Enables or disables the Meter’s beeper. This setting is stored in volatile

memory. Disabling the beeper causes the Meter to not beep for the following conditions:

a new minimum or maximum is detected during statistics a limit is exceeded during a limits test a forward-biased diode is measured during a diode test

Parameters <n> = ON or 1 Enables the Meter’s beeper. OFF or 0 Disables the Meter’s beeper.

Examples SYST:BEEP:STAT ON Enables the beeper. Query SYST:BEEP:STAT? Retrieves the state of the Meter’s beeper ( 0 =

OFF and 1 = ON).

SYSTem:DATE(?) <date>

Description Sets the system clock date. Parameters <date> = MM/DD/YYYY or MM-DD-YYYY.

MM between 1 and 12 DD between 1 and 31 YYYY between 1970 and 2038

Digital Multimeter

Supported SCPI Commands

Examples SYST:DATE 10/25/2007 Query SYST:DATE? Returns the Meter’s system clock date.

SYSTem:TIME(?) <time>

Description Sets the system clock time in 24 format. Parameters <time> = HH:MM:SS or HH-MM-SS

HH between 0 and 23 MM between 0 and 59 SS between 0 and 59

Examples SYST:TIME 14:25:10 Sets time to 2:25:10 PM Query SYST:TIME? Returns the Meter’s system clock time.

SYSTem:VERSion?

Description Retrieves the Meter’s present SCPI command version. Examples SYST:VERS? Returns the SCPI version.

DATA:POINts?

Description Retrieves the number of measurements contained in the Meter’s internal

memory.

Examples DATA:POIN? Returns number of measurements in internal

*RST

Description Resets the Meter to its power-up configuration. Examples *RST Resets the Meter.

IDN <n>, [<quoted string>]

Description Enables or disables the retrieval of a user-specified IDN string or factory-

set IDN string with the *IDN? command. Also sets the user defined IDN string.

Parameters <n> = ON or 1 Enables user-defined string. OFF or 0 Disables user-defined string and causes the

<quoted string> = Up to a 35 character string. Example IDN ON, “My Meter” Sets the IDN string to “My Meter” and enables

*IDN?

Description Returns the IDN string. If IDN is enabled (ON), then the Meter returns the

user defined string. If IDN is disabled (OFF), the the Meter returns the IDN string set at the factory.

memory.

factory IDN string to be returned for an *IDN? command.

the user defined string to be returned when the *IDN? command is received by the Meter.

Query *IDN? Returns up to 35 character string.

DMM4040/4050

Programmer Manual

Using Status Reporting Commands

SYSTem:ERRor?

SYSTem:ERRor:BEEPer(?) <n>

Description Retrieves an error from the Meter’s error queue. Errors are retrieved in

first-in, first-out (FIFO) order. Each error may contain up to 80 characters. The error queue will store up to 16 errors at which point no additional errors will be stored until errors are removed from the queue.

Examples SYST:ERR? Returns the next error in the error queue.

Performing a SYST:ERR? command when the error queue is empty causes +0,″No error″ to be returned.

Description Enable or disables the Meter’s beeper for error messages. This setting is

stored in volatile memory.

Parameters <n> = ON or 1 Enables beeper for error messages. OFF or 0 Disables beeper for error messages.

Examples SYST:ERR:BEEP ON Set Meter to beep when errors are detected. Query SYST:ERR:BEEP? Returns state of beeper for error messages ( 0 =

STATus:QUEStionable:ENABle(?) <n>

Description Enables or disables bits in the Meter’s Questionable Data enable register. Parameters <n> = 0 to 65535 Binary-weighted decimal value representing the

Examples STAT:QUES:ENAB 4 Sets bit 2 to one and all others to zero. Query STAT:QUES:ENAB? Retrieves a binary-weighted decimal value

STATus:QUEStionable:EVENt?

Description Enables or disables bits in the Meter’s Questionable Data event register. Parameters <n> = 0 to 65535 Binary-weighted decimal value representing the

Query STAT:QUES:EVEN? Retrieves a binary-weighted decimal value

OFF and 1 = ON).

bits to set in the register. Although a 16-bit register that will accept a number between 0 and 65535, only bits 0, 1, 9, 11, 12, and 13 are used.

representing the bits set in the questionable data enable register.

bits to set in the register. Although a 16-bit register that will accept a number between 0 and 65535, only bits 0, 1, 9, 11, 12, and 13 are used.

representing the bits set in the questionable data event register.

STATus:PRESet

Description Sets all bits to zero in the Meter’s Questionable Data enable register. Examples STAT:PRES Sets all bits to zero.

Digital Multimeter

Supported SCPI Commands

*CLS

Description Sets all bits to zero in the Meter’s status byte register and all event

registers. Also clears the error queue.

Examples *CLS Sets all bits to zero and clear error queue.

*ESE <enable value>

Description Enables or disables bits in the Meter’s Standard Event enable register. Parameters <n> = 0 to 255 Binary-weighted decimal value representing the

bits to set in the register. Although this register has 8 bits and will accept a number from 0 to 255, only bits 0, 2 through 5, and 7 are used.

Examples *ESE 160 Sets bits 5 and 7 to one and all other bits to zero.

*ESE?

Description Retrieves the value in the Meter’s Standard Event enable register. Examples *ESE? Retrieves a binary-weighted decimal value

representing the bits set in the Standard Event enable register.

*ESR?

Description Retrieves the value in the Meter’s Standard Event register. Examples *ESR? Retrieves a binary-weighted decimal value

*OPC

Description Sets bit 0 (Operation complete) in the Meter’s Standard Event register. Examples *OPC Sets bit 0 in the Standard Event register.

*OPC?

Description Returns a one to the Meter’s output buffer. Examples *OPC? A “1” is placed in the output buffer of the Meter.

*PSC <n>

Description Enables or disables the clearing of the Status Byte Enable register and

Parameters <n> = 0 Disables clearing Status Byte and Standard

1 Enables clearing Status Byte and Standard Event

representing the bits set in the Standard Event register.

Standard Event Enable register when Meter power is turned on. This setting is stored in non-volatile memory.

Event Enable register at power-up.

Enable register at power-up.

DMM4040/4050

Programmer Manual

*PSC?

*SRE <enable value>

*SRE?

Description Returns the state of the clearing of the Status Byte and Standard Event

Enable registers at power-up.

Examples *PSC? Returns zero if clearing is disabled. Returns one

if clearing is enabled.

Description Enables or disables bits in the Meter’s Status Byte enable register. Parameters <n> = 0 to 255 Binary-weighted decimal value representing the

bits to set in the register. Although this register has 8 bits and will accept a number from 0 to 255, only bits 3 through 5 are used.

Examples *SRE 48 Sets bits 4 and 5 to one and all other bits to zero.

Description Retrieves the value in the Meter’s Status Byte enable register. Examples *SRE? Retrieves a binary-weighted decimal value

representing the bits set in the enable register.

*STB?

Description Retrieves the value in the Meter’s Status Byte summary register. Although

like a serial poll, this command is processed as an instrument command. Returned results are the same as when receiving a serial poll, but the SRQ bit is not cleared if a serial poll has occurred.

Examples *STB?

Calibration Commands

CALibration? [{ON|OFF}]

Description After entering the proper code using the CAL:SEC:CODE command, this

command causes the Meter to perform an adjustment using the values supplied with the CAL:VAL command. See the DMM4040 and DMM4050 Technical Reference Manual, (PN 077-0362-XX) for details on using this command.

Parameters <n> = ON or 1 Execute only one calibration step. OFF or 0 Execute a group (mode) of related calibration

Examples CAL? ON Execute one calibration step for the calibration

CAL? Returns +0 (good) or +1 (failed)

steps at one time.

group specified by the CAL:VAL command.

Digital Multimeter

Supported SCPI Commands

CALibration:COUNt?

Description Retrieves the number of times Meter points have been calibrated. Read this

value just after receiving the Meter to obtain a starting value. This setting is stored in non-volatile memory.

Note

This value increments once for each calibration point. A complete calibration will increment this value many times. The maximum count is 4,294,967,295, at which point the next calibration causes this value to reset to zero.

Examples CAL:COUN? Retrieves the number of times points have been

calibrated.

CALibration:RECord

Description Stores the calibration values. Example CAL:REC Stores all of the Meter’s changed calibration

values.

CALibration:SECure:CODE <new code >

Description Sets a new calibration password. Before entering a new code, you must

first enter the old password using the CAL:SEC:STAT command. The Meter has a password of TEKDMM40XX when shipped from the factory.

Parameters <new code> = Up to 12 characters of capital letters and

Example CAL:SEC:CODE 12B Sets the new calibration password to 12B.

The password cannot be recalled, but the password can be reset to the factory default without returning the Meter for service.

XW Warning

To avoid electric shock and or injury, do not open the Meter unless you are qualified to do so.

Opening the Meter case may void the warranty. Located at the rear of the chassis, behind the Ethernet connector (J17), there is a jumper connector labeled W2. Short the pins of W2 together and power cycle the Meter to reset the password to TEKDMM40XX.

CALibration:SECure:STATe(?) <n>,<code >

Description Secure or unsecure the Meter for calibration. This setting is stored in non-

volatile memory.

Parameters <n> = ON or 1 Secures the Meter from calibration. OFF or 0 Unsecures the Meter for calibration.

numerials (A-Z, 0-9).

<code> = Up to 12 character string. Example CAL:SEC:STAT OFF 12B Unsecures the Meter for calibration when the

password is 12B. Query CAL:SEC:STAT? Retrieves the state of the Meter’s calibration

security ( 0 = OFF and 1 = ON).

DMM4040/4050

Programmer Manual

CALibration:STRing(?) <quoted string>

CALibration:VALue(?) <mode>, <value >

Description Store calibration information in the Meter’s memory. This setting is stored

in non-volatile memory.

Parameters <quoted string> = Up to a 40 character string. Query CAL:STR? Retrieves the Meter’s calibration string.

Description Sets up the Meter for a calibration point. The mode parameter is the name

of the functional group being calibrated. The value parameter is the Meter’s range for the calibration point. Refer to the calibration procedure in the DMM4040 and DMM4050 Technical Reference Manual, (PN 077- 0362-XX) for mode names and values.

Parameters <mode> = See the DMM4040 and DMM4050 Technical

Reference Manual, (PN 077-0362-XX) Manual

<value> = See the DMM4040 and DMM4050 Technical

Reference Manual, (PN 077-0362-XX)

Query CAL:VAL? Retrieves the Meter’s calibration value.

CALibration:STEP(?) <step #> [,Reference]

Description Specifies the calibration step number and the optional reference value of

the known calibration signal used by the calibration procedure. See the DMM4040 and DMM4050 Technical Reference Manual, (PN 077-0362XX) for a list of calibration steps with values.

Parameters <step #> = (See the DMM4040 and DMM4050 Technical Reference

Manual, (PN 077-0362-XX)

Examples CAL:STEP 5 Sets the calibration step to number 5. Query CAL:STEP? Returns the Meter’s calibration step.

Using RS-232/Ethernet Interface Commands

There are four remote commands that are specifically applicable to controlling the Meter using the RS-232 or Ethernet remote interface.

SYSTem:LOCal

Description Places the Meter in the local mode. Front-panel keys still function. Example SYST:LOC

Digital Multimeter

Supported SCPI Commands

SYSTem:REMote

Description Places the Meter in the remote mode for RS-232 or Ethernet remote

control. All front-panel keys, except the local key, are disabled.

Example SYST:REM

Note

To avoid unpredictable operation, send a SYS:REM command to the Meter before sending or receiving data over the RS-232 or Ethernet interface.

SYSTem:RWLock

Description Like the SYST:REM command, this command places the Meter into

remote mode, but with all front-panel keys, including the local key, disabled.

Example SYST:RWL

Ctrl-C

Description Immediately stops transfers of data over the RS-232 interface and clears

any output data.

This the same as sending a device clear over the IEEE-488 bus.

Command Terminators

A command string sent to the Meter must terminate with a <new line> character. The IEEE-488 EOI (end-or-identify) message is interpreted as a <new line> character and can be used to terminate a command string in place of a <new line> character. A <carriage return> followed by a <new line> is also accepted. Command string termination will always reset the current SCPI command path to the root level.

SCPI Parameter Types

The SCPI language defines several different data formats to be used in program messages and response messages.

Numeric Parameters

Commands that require numeric parameters will accept all commonly used decimal representations of numbers including optional signs, decimal points, and scientific notation. Special values for numeric parameters like MINimum, MAXimum, and DEFault are also accepted. You can also send engineering unit suffixes with numeric parameters (e.g., M, K, or u). If only specific numeric values are accepted, the Meter will automatically round the input numeric parameters. The following command uses a numeric parameter:

Note

VOLTage:DC:RANGe {<range>|MINimum|MAXimum}

DMM4040/4050

Programmer Manual

Discrete Parameters

Boolean Parameters

String Parameters

Discrete parameters are used to program settings that have a limited number of values (like BUS, IMMediate, EXTernal). They have a short form and a long form just like command keywords. You can mix upper- and lower-case letters. Query responses will always return the short form in all upper-case letters. The following command uses discrete parameters:

TRIGger:SOURce {BUS|IMMediate|EXTernal}

Boolean parameters represent a single binary condition that is either true or false. For a false condition, the Meter will accept OFF or 0. For a true condition, the Meter will accept ON or 1. When you query a boolean setting, the instrument will always return “0” or “1”. The following command uses a boolean parameter:

INPut:IMPedance:AUTO {OFF|ON}

String parameters can contain virtually any set of ASCII characters. A string must begin and end with matching quotes; either with a single quote or with a double quote. You can include the quote delimiter as part of the string by typing it twice without any characters in between. The following command uses a string parameter:

DISPlay:TEXT <quoted string>

Alternate Programming Language Compatibility

The Meter can be configured to accept and execute DMM4040/4050 SCPI commands (HP 34401A compatible), non SCPI compliant modes Fluke 8842A or Fluke 45 multimeter commands. Remote operation will only allow you to access the functionality of the multimeter language selected. Full Meter capability is available through the DMM4040/4050 SCPI programming language. For more information on selecting the alternate languages from the front panel menu, see Selecting the Programming Language earlier in this manual. From the remote interface, use the following commands to select the alternate languages:

L1 selects SCPI language L2 selects Fluke 45A language L3 selects Fluke 8842A language

The Meter implements virtually all of the commands available for the Fluke 45, Fluke 8842A, and HP 34401A, with the exception of the self-test and calibration commands. You must always calibrate the Meter using the SCPI language setting. The calibration commands from the other multimeters will not be executed.

Be aware that measurement timing, triggering, and range mapping may be different in the alternate language compatibility modes.

Digital Multimeter

FLUKE 45 Command Emulation Summary

Computer Interface Command Set

RS-232 and IEEE-488 commands, grouped by related function, are listed in the tables that follow. These commands are identical, except where indicated. A parameter that must be supplied by the user or a string returned by the Meter is enclosed in angle brackets (<value>).

• IEEE-488 Common Commands (Table 19)

• Function Commands and Queries (Table 20)

• Function Modifier Commands and Queries (Table 21)

• Range and Measurement Rate Commands and Queries (Table 22)

• Measurement Queries (Table 23)

• Compare Commands and Queries (Table 24)

• Trigger Configuration Commands (Table 25)

• Miscellaneous Commands and Queries (Table 26)

• RS-232 Remote/ Local Configuration Commands (Table 27)

IEEE-488 Capabilities and Common Commands

Table 19 summarizes the IEEE-488 Commands that are common between the Tektronix 4040/4050 and the Fluke 45.

Table 19. IEEE-488.2 Common Commands

Command Name Description

*CLS Clear Status Clears all event registers summarized in the status byte,

except for "Message Available," which is cleared only if *CLS is the first message in the command line.

*ESE <value> Event Status Enable Sets Event Status Enable Register to <value>, an integer

between 0 and 255, where <value> is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register. If <value> is not between 0 and 255, an Execution Error is generated.

EXAMPLE: decimal 16 converts to binary 00010000. Sets bit 4 (EXE) in ESE to 1.

*ESE? Event Status Enable

Query

*ESR? Event Status

Meter returns the <value> of the Event Status Enable Register set by the *ESE command, where <value> is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register.

Meter returns the <value> of the Event Status Register and then clears it. The <value> is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register.

DMM4040/4050

Programmer Manual

Command Name Description

*IDN? Identification Query Meter returns the identification code of the meter as four fields

*OPC Operation Complete

*OPC? Operation Complete

*RST Reset Meter performs power-up reset, except that the state of IEEE-

*SRE <value>

Table 19. IEEE-488.2 Common Commands (cont.)

Command

Query

Service Request Enable

separated by commas. These fields are: vendor ("TEKTRONIX"); model (“DMM4050"); seven-digit serial number; firmware creation date and time.

[1]

(example:

TEKTRONIX, DMM4040, 9963001, 05/19/09-13:59) Meter sets the Operation Complete bit in the Standard Event

Status Register when parsed. Meter places an ASCII "1 " in the output queue when parsed.

488 interface is unchanged, including: instrument address, Status Byte, and Event Status Register.

Sets the "Service Request Enable Register" to <value>, an integer between 0 and 255. The value of bit six is ignored because it is not used by the Service Request Enable Register.

Note that <value> is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register. If <value> is not between 0 and 255, an Execution Error is generated.

*SRE?

Service Request

Enable Query

Meter returns the <value> of the Service Request Enable Register (with bit six set to zero); <value> is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register.

*STB? Read Status Byte Meter returns the <value> of the Status Byte with bit six as the

Master Summary bit.

<value> is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register.

*TRG Trigger Causes the meter to trigger a measurement when parsed. *WAI Wait-to-continue Command required by IEEE-488.2 standard. Non-operational

in Fluke 45 Dual Display Multimeter. Command accepted but has no effect.

[1] The user defined IDN DMM4040/4050 command identification response will set the *IDN? Indentification query

response for both DMM4040/4050 and Fluke 45 modes of operation. IDN is an “4040/50” only command.

Digital Multimeter

FLUKE 45 Command Emulation Summary

Function Commands and Queries

The commands in Table 20 lists the measurement function commands for the Fluke 45. See Tables 22A and 22B for ranges and measurement rates. Commands under Primary Display and Secondary Display cause functions to be performed using the primary display or secondary display, respectively.

Table 20. Fluke 45 Function Commands and Queries

Primary Display

AAC

ADC

—

CONT

DIODE

FREQ

FUNC1 ?

OHMS

VAC

VDC

Commands

Secondary Display

AAC2

ADC2

CLR2

—

DIODE2

FREQ2

—

FUNC2?

OHMS2

VAC2

VDC2

Function

AC current

DC current

Clears measurement from secondary display if one shown.

Continuity test. Available in the primary display only.

Diode test

Frequency

Meter returns the function selected for the primary display as command mnemonic.

EXAMPLE: If frequency is selected for the primary display, "FUNC1?" returns "FREQ".

Meter returns the function selected for the secondary display as command mnemonic. If the secondary display is not in use, an Execution Error is generated.

EXAMPLE: If frequency is selected for the secondary display, FUNC2? returns "FREQ".

Resistance

AC volts

DC volts

DMM4040/4050

Programmer Manual

Function Modifier Commands and Queries

Command Description

AFILT (on/off)

AFILT?

DBCLR

DBPOWER

DBREF <value>

DBREF?

DFILT (on/off)

The commands in Table 21 relate to the function modifiers. A function modifier causes the Meter to modify the normal operation of a measurement function (or perform an action on a measurement) before displaying a reading.

Table 21. Function Modifier Commands and Queries

Activates or deactivates the 3-pole analog filter to improve noise immunity for dc functions. This filter is only available in DCV, DCI, 2-Wire and 4-Wire resistance. The default setting is OFF. If an attempt is made to enable the filter in a mode not permitted, the request is ignored.

Returns the state of the analog filter.

Meter enters decibels modifier. Any reading shown in the primary display is in decibels.

An Execution Error is generated if the meter is not in a volts ac and/or dc function.

Meter exits the decibels modifier and displays readings in normal units. Also clears dB and Power modifiers.

Meter enters dB Power modifier if the reference impedance is set to 2, 4, 8, or 16 ohms and a voltage function has been selected. Otherwise, an Execution Error is generated. In dB Power, readings shown in the primary display are in watts.

Set dB reference impedance to a <value> shown in Table 22A. This value corresponds to the reference impedance (ohms) indicated.

If <value> is not a value shown in Table 22A, an Execution Error is generated.

Table 22A. Reference Impedance Values

Value

1 2 3 4 5 6 7 8 9 10 11

Meter returns a <value> shown in Table 22A. This value corresponds to the reference impedance indicated.

Activates or deactivates the digital averaging filter to reduce noise for dc functions. This filter is only available in DCV, DCI, 2-Wire and 4-Wire resistance. The default setting is ON. If an attempt is made to enable the filter in a mode not permitted, the request is ignored.

Ref Impedance

2 4 8 16 50 75 93 110 124 125 135

Value

12 13 14 15 16 17 18 19 20 21

Ref Impedance

150 250 300 500 600 800 900 1000 1200 8000

Digital Multimeter

Table 21. Function Modifier Commands and Queries (cont.)

Command Description

DFILT?

MOD?

Returns the state of the digital averaging filter.

Meter returns a numeric value indicating modifiers in use. 8=dB, 16=dB Power, 32 = Relative, 64 = Compare.

FLUKE 45 Command Emulation Summary

Range and Measurement Rate Commands and Queries

The commands in Table 22 relate to ranging and measurement rates (i.e., readings/ second). In the autorange mode, the Meter automatically selects a range for each reading; in the manual range mode, the user selects a fixed range.

Table 22. Range and Measurement Rate Commands and Queries

Command Description

AUTO

AUTO?

FIXED

RANGE <range>

Causes the meter to enter the autoranging mode on the primary display. If the autorange mode cannot be selected (e.g., if dB or diode/continuity test is selected), an Execution Error is generated.

Causes meter to return "1" in autorange, or "0" if it is not.

Causes the meter to exit autoranging on the primary display and enter manual ranging. The present range becomes the selected range.

Sets the primary display to the range designated by <range>, where <range> is a number between 1 and 7 that corresponds to a range shown in Tables 5-12A and 5-12B.

Table 23A. Ranges at Fast & Medium Measurement Rate

Range

Value

1 2 3 4 5 6 7

* 1000 V dc, 750 V ac

Range

Value

1 2 3 4 5 6 7

* 1000 V dc, 750 V ac

Voltage

Range

300 mV

3 V

30 V

300 V

1000 V dc*

ERROR ERROR

Table 23B. Ranges at Slow Measurement Rate

Voltage

Range

100 mV 1000 mV 10 V 100 V 1000 V dc* ERROR ERROR

Ohms

Range

300 Ω

3 k Ω

30 k Ω

300 k Ω

3 M Ω

30 M Ω

300 M Ω

Ohms

Range

100 Ω 1000 Ω 10 k Ω 100 k Ω 1000 k Ω 10 M Ω 100 M Ω

Current

Range

30 mA

100 mA

10 A ERROR ERROR ERROR ERROR

Current

Range

10 mA 100 mA 10 A ERROR ERROR ERROR ERROR

1000 Hz 10 kHz 100 kHz 1000 kHz 1 MHz ERROR ERROR

Frequency

Range

1000 Hz

10 kHz

100 kHz

1000 kHz

1 MHz ERROR ERROR

Frequency

Range

DMM4040/4050

Programmer Manual

Command Description

RANGE1?

RANGE2?

RATE <speed>

RATE?

Measurement Queries

Table 22. Range and Measurement Rate Commands and Queries (cont.)

Returns the range presently selected on the primary display.

Returns the range presently selected on the secondary display. If the secondary display is inactive, an Execution Error is generated.

Sets the measurement rate to <speed>. RATE <speed> is either "S" for slow (2.5 readings/second), "M" for medium (5 readings/second), or "F" for fast (20 readings/second). "S", "M", and "F" can be sent as either upper- or lower-case letters. Any other entry for <speed> generates an Execution Error.

Returns <speed> as "S" for slow (2.5 readings/second), "M" for medium (5.0 readings/second), or "F" for fast (20 readings/second).

The commands in Table 23 cause the Meter to return readings shown on the primary and/or secondary displays.

Table 23. Measurement Queries

Command Description

MEAS1?

MEAS2?

MEAS?

VAL1?

VAL2?

VAL?

Meter returns the value shown on the primary display after the next triggered measurement is complete.

Meter returns the value shown on the secondary display after the next triggered measurement is complete. If the secondary display is off, an Execution Error is generated.

If both displays are on, the Meter returns the value shown on both displays after the next triggered measurement is complete in the format selected. These values are separated by a comma (format 1) or a space, measurement units, a comma and space (format 2).

Example: +1.2345E+0,+6.7890E+3<CR><LF>

If the secondary display is not on, MEAS? is equivalent to MEAS1?

Note If MEAS is used in external trigger (TRIGGER 2 through TRIGGER 5), unexpected results will be obtained.

Meter returns the value shown on the primary display. If the primary display is blank, the next triggered measurement is returned.

Meter returns the value shown on the secondary display. If the secondary display is blank, the next triggered measurement is returned. If the secondary display is off, an execution error is generated.

If both displays are on, the Meter returns the value shown on both displays. These values are separated by a comma.

Example: +1.2345E+0,+6.7890E+3<CR><LF>. If the secondary display is not on, VAL is equivalent to VAL1. If a display is blank, the next triggered measurement on that display (or displays) is returned.

Digital Multimeter

FLUKE 45 Command Emulation Summary

Compare Commands and Queries

The commands in Table 24 cause the Meter to determine whether a measurement is higher than, lower than, or within a specified range.

Table 24. Compare Commands and Queries

Command Description

COMP

COMP?

COMPCLR

COMPHI <high value>

COMPLO <low value>

Meter enters compare (COMP) function.

Meter returns "Hl" if the last COMP measurement reading was above the compare range, "LO" if it was below it, "PASS" if within compare range, or "— " if a measurement has not been completed.

Meter exits compare function, and restores display to normal operation.

Sets HI compare (COMP) value to <high value>, where <high value> can be a signed integer, signed real number without exponent, or signed real number with exponent.

Sets LO compare (COMP) value to <low value>, where <low value> can be a signed integer, signed real number without exponent, or signed real number with exponent.

Trigger Configuration Commands

The commands in Table 25 set and return the trigger configuration.

Table 25. Trigger Configuration Commands

Command Description

TRIGGER <type>

TRIGGER?

Sets the trigger configuration to <type>.

<type> corresponds to a number between 1 and 5 selected from Table 26A. If the <type> entered is not one of these listed numbers, an Execution Error is generated.

Table 26A. Trigger Type

Type Trigger Rear Trigger Settling Delay

Internal

External

[1] Although the Fluke 45 disabled the rear-panel trigger for these trigger types, the DMM4040/4050 leaves the rear-panel trigger enabled.

When the input signal is not stable, select a trigger type with the settling delay (type 3 or 5) enabled before a measurement is triggered.

Returns the trigger <type> set by the TRIGGER command.

Enabled Enabled

[1]

Off On Off On

DMM4040/4050

Programmer Manual

Miscellaneous Commands and Queries

Command Description

^C (CNTRL C)

SERIAL?

RS-232 Remote/Local Configurations

Command Description REMS

RWLS

LOCS

LWLS

Miscellaneous commands and queries are summarized in Table 26.

Table 26. Miscellaneous Commands and Queries

The RS-232 equivalent of IEEE-488 DCL. Causes <CR><LF> and =><CR><LF> to be output.

Meter returns its serial number.

The commands in Table 27 are used with the RS-232 interface to set up the Remote/ Local configuration of the Meter. These commands are valid only when the RS-232 interface is enabled.

Table 27. RS-232 Remote/Local Configuration Commands

Puts the Meter into remote state where all front-panel keys, except the local key, are disabled. LOCAL is shown above the first soft key in the display.

Puts the Meter in the remote state, with front-panel lockout. LOCKED is shown in the display. When in RWLS, all front panel buttons are disabled.

Puts the Meter in the local state, i.e., local operating mode without lockout. All front panel buttons are enabled.

Puts the Meter in the IEEE-488 LWLS state, i.e., local operating mode lockout. All front panel buttons are disabled.

Triggering Output

The Meter takes measurements when it is triggered to do so. The five available trigger types are listed in Table 28. All available trigger methods fall into two basic categories:

• Internal triggering uses the Meter’s internal trigger circuit for a continuous source of

triggers.

• External triggering comes from a source outside the Meter controlled by the user.

Setting the Trigger Type Configuration

To select a trigger type over the computer interface, send the command: TRIGGER <type> where <type> is a number between 1 and 5 that identifies a trigger type. If <type> is not

one of these numbers, an Execution Error is generated. Select a trigger type that enables the settling delay (type 3 or 5) when the input signal is

not stable before a measurement is triggered.

Digital Multimeter

Using NI SignalExpress, Tektronix Edition

External Triggering

A measurement can be externally triggered in three ways:

• External trigger.

• GET command (IEEE-488 Interface only)

• *TRG command

To trigger a measurement over the RS-232 or IEEE-488 computer interface, send the Meter a *TRG command over the computer interface. The GET command is only valid for the IEEE-488 interface.

When set for external trigger, the Meter will trigger measurements when a negative-going signal is applied to the rear-panel trigger jack.

Note

The Fluke 45 provides a method of triggering through its RS-232 port. The DMM4040 and 4050 do not provide this method of triggering.

Table 28. Trigger Types

Type Trigger Rear Trigger Settling Delay

1 2 3 4 5

[1] Although the Fluke 45 disabled the rear-panel trigger for these trigger types, the DMM4040/4050 leaves the rear-

panel trigger enabled.

Internal External External External External

Enabled Enabled

[1]

Off On Off On

Using NI SignalExpress, Tektronix Edition

You can use NI SignalExpress, Tektronix Edition to download and store readings from the Meter to a PC running Microsoft’s Windows operating system. NI Signal Express, Tektronix Edition must first be installed on the PC. Refer to the DMM4020, DMM4040, and DMM4050 Connectivity Intallation Manual to install NI SignalExpress, Tektronix Edition on your Windows PC.

FLUKE 8842A Emulation Mode

The Fluke 8842A emulation mode is only available through the GPIB interface. Whenever the DMM4040 or 4050 has the RS-232 or LAN interface selected, Fluke 8842A emulation mode is not selectable through the front panel.

The Fluke 8842A IEEE-488 commands are listed in the following tables. These commands are identical, except where indicated. For operational differences and commands that are not supported in the DMM4040 or 4050, refer to Appendix D.

Example Notes

In the examples in this manual, device-dependent commands are shown enclosed within quotation marks, as they would be entered in Fluke BASIC. For clarity, the commands are also separated by spaces. However, the spaces are are not necessary and may be omitted.

Example Explanation

DMM4040/4050

Programmer Manual

Here is a typical command string as it might be sent from a Fluke 1722A Instrument Controller. The string configures the meter and triggers a reading. The PRINT command automatically sends terminators (CR, LF, and/or EOI) to the meter at the end of the command string.

IEEE-488 bus address

Resets the meter to the

power-up configuration

Selects the 2 WIRE kΩ function

“* F3 R1 S1 T2” This example is equivalent to “*F3R1S1T2” or

“*,F3,R1,S1,T2”.

Using the Fluke 1722A Instrument Controller, these commands might be written into a BASIC program as shown in Figure 5. Examples using other controllers are given at the end of this section.

PRINT @3, “* F3 R4 S1 T2 ?”

Selects the 200 kΩ range

Selects the medium reading rate

Selects the external trigger mode

(Rear panel trigger disabled)

Triggers a reading

caw65.eps

Figure 5. Typical Command String for Fluke 8842A Emulation

Examples of Fluke 8842A emulation output data show the terminators CR and LF. The terminator EOI is not shown because it is a uniline message. However, the terminators CR, LF, and EOI are all selectable using the Write commands.

Digital Multimeter

FLUKE 8842A Emulation Mode

Function Commands

F1 V dc (Default) F2 V ac F3 2 WIRE kΩ F4 4 WIRE kΩ F5 mA dc F6 mA ac

Range Commands

R0 Autorange On (Default) R1 200 mV, 200 Ω R2 2 V, 2 kΩ R3 20 V, 20 kΩ R4 200 V, 200 kΩ, 200 mA dc R5 1000 V dc, 700 V ac, 2 MΩ, 2000 mA R6 20 mΩ R7 Autorange Off R8 20 mV, 20 Ω

Reading Rate Commands

S0 Slow (Default) S1 Medium S2 Fast

Trigger Mode Commands

Command

T0 (Default)

T1 T2 T3 T4

Trigger

Mode

Internal External External External External

Setting

Delay

On On Off Off

Offset Commands

B0 Offset Off (Default) B1 Offset On

Display Commands

D0 Normal Display (Default) D1 Blank Display

Suffix Commands

Y0 Disable Output Sffix Y1 Enable Output Suffix

Terminator Commands

W0 Enable CR LF EOI (Default) W1 Enable CR LF Only W2 Enable CR EOI Only W3 Enable CR Only W4 Enable LF EOI Only W5 Enable LF Only

Figure 6. Fluke 8842A Emulation Device-Dependent Command Set

Clear Commands

* Device Clear (Reset meter to default conditions) X0 Clear Error Register

Single-Trigger Commands

? Trigger Measurement

Get Commands

G0 Get Instrument Configuration (F,R,S, and T) G1 Get SRQ Mask G3 Get User-Defined G4 Get Calibration Status G5 Get IAB Status (Input F/R, Autorange On/Off, Offset On/Off) G6 Get YW Status (Suffix Enabled/Disabled, Terminator Selection) G7 Get Error Status G8 Get Instrument Identification

Put Commands

P0 Put Instrument Configuration (F,R,S, and T) P1 Put SRQ Mask

Put Command Format

N <value> P0 N <value> P1

SRQ Mask Values

00 for SRQ Disabled (Default) 01 for SRQ On Overrange 16 for SRQ On Data Available 32 for SRQ On Any Error

Note: Add SRQ mask values for connections. Example: 33 for SRQ on overrange or

any error.

Self-Test Command

Z0 Begin Self-Test

Terminators

CR (Carriage Return) Execute LF (Line Feed) Execute EOI (End Or Identify) Execute GET (Group Execute Trigger) Trigger and Execute

Note: GET is an interface message.

caw66.eps

DMM4040/4050

Programmer Manual

Device-Dependent Command Set

Bn (Offset Commands)

Device-dependent commands are the heart of Fluke 8842A emulation remote control. They tell the Meter how and when to make measurements, when to put data on the bus, when to make service requests, etc. The complete set of device-dependent commands is listed in Figure 6. The commands may be entered using either upper- or lower-case letters.

Device-dependent commands are device-dependent messages. For the Meter to receive them, they must be sent over the IEEE-488 bus when the Meter is in remote and has been addressed as a listener.

The following paragraphs describe the device-dependent commands in alphabetical order. Special characters (* and ?) are described last.

When the Meter receives the B1 command, the Meter stores the present reading as an offset for the present function. The B0 command cancels the offset. Only one offset is allowed at a time.

The offset status (not the offset value) can be read using the G5 command. The Meter defaults to B0 on both power-up and on any device-clear command (*, DCL, or SDC).

Dn (Display Commands)

The Display commands allow the user to blank the display in the Meter. The D0 command causes the display to operate normally, and is the default on power-up and upon any device-clear command (*, DCL, or SDC).

The D1 command blanks the display. The D1 command is used for best performance when high IEEE-488 Interface Data rates are required.

Fn (Function Commands)

The function commands duplicate the front panel function buttons. The Meter defaults to Fl on power-up and on any device-clear command (*, DCL, or SDC). If F0 is sent to the Meter, it is internally converted to F1. The function setting can be read using the G0 command.

As with the front panel commands, selecting F6 automatically selects the 2000 mA range (R5). If the instrument is in range R8, commanding F5 automatically selects the 200 mA range (R4). If the instrument is in R1 through R6, commanding F5 automatically selects the 2000 mA range (R5). If the Meter is in a resistance function (F3 or F4) and in R6, selecting any other function automatically selects R5. If the Meter is in range R8 and F2 or F3 is commanded, range R1 is selected.

Get Commands

The Get commands "get" information from the Meter for the controller. Each Get command loads the output buffer with an output string in the format shown in Figure 7. Status data (the output from Get commands G0, G1, G3, G4, G5, G6, G7 and G8) is interpreted as shown in Table 29. The Get commands should not be confused with the interface message GET (Group Execute Trigger).

Digital Multimeter

Output Data Type Format

Numeric Data +n.nnnnnE+nn[suffix][CR][LF][EOI] (From trigger)

Examples:

+12.3456E+6 Measured value +12.3456E+6, Ohm Measured value

-9.99999E+9 Overrange (≥ 200,000 counts) +9.99999E+9,>VDC Overrange (≥ 200,000 counts) +1.0032E+21 Error Message

Instrument Configuration Data nnnn [CR] [LF] [EOI] (From G0, G4, G5, G6, and G7) Example: 1100 Default G0 value

SRQ Mask Data nn [CR] [LF] [EOI] (From G1) Example: 32 SRQ on any error

Numeric data is always in volts, amps, or ohms. The terminators CR, LF, and EOI are selected with the Terminator Commands (Wn). The suffix, defined below, is enabled with the Y1 command and disabled with the Y0 command. (Default = Y0.)

FLUKE 8842A Emulation Mode

Suffix Format

Leading Comma (Always present in suffix). Most versions of BASIC expect multiple input values to be separated by commas. (e.g.,input@I,N,S$) to acquire the numeric portion and suffix string.

> Reading is overrange (≥ 200,000 counts) <space> Reading is not overrange but can be over voltage (> 1000 V dc or 700 Vac)

V dc V ac Ohm

IDC IAC

Function Indicator

Figure 7. Fluke 8842A Emulation Data Output Format

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DMM4040/4050

Programmer Manual

Command Output String Description

G2 Error 51 Not supported in 8842A emulation mode.

Table 29. Fluke 8842A Get Commands

frst f = 1 – 6 for function selection

r = 1 – 6 for selected range s = 0 – 2 for selected measurement rate t = 0 – 4 for selected trigger mode

nn nn = 00 for SRQ disabled

01 for SRQ on overrange 16 for SRQ on data available 32 for SRQ on any error Note: SRQ mask values may be added for combinations. Example: 33 for SRQ on overrange or any error.

[1]

G8 FLUKE,8842A, nnnnnnn,V5.0 nnnnnnn = Instrument serial number

[1] The DMM4040 and 4050 have an error queue of 16. For multiple errors, G7 will dequeue the errors one by one but

will not clear the ERROR indicator on the front panel when the queue is empty. X0 clears the ERROR annunciator.

FL8842A.1-8-2008 Can’t set user defined message in 8842A

emulation.

10vm v = 0 Not in cal verification

m = 0 Not in calibration mode

1iab i = 0 Front-panel inputs selected

1 Rear-panel inputs selected a = 0 Autorange on 1 Autorange off (manual ranging) b = 0 Offset off 1 Offset on

10yw y = 0 Output suffix disabled

1 Output suffix enabled w = 0 – 5 Selected terminator command

10nn nn = Error code

The output data from some Get commands starts with a leading 1 or 10. This prevents the controller from suppressing leading zeroes and gives a uniform four-character length to all instrument configuration data (the data from Get commands G0, G4, G5, G6, and G7).

The Get commands are described further in the following paragraphs. For more information about output data, see Syntax Rules later in this section.

G0 (Get Instrument Configuration)

The G0 command copies the function, range, reading rate, and trigger mode of the Meter into the output buffer in the format shown in Figure 7. The four digits returned represent the arguments for the equivalent F, R, S, and T commands, as shown in Table 29. An example output string follows:

Example Explanation

3410 CR LF 3: F3 (2-Wire kΩ function)

Digital Multimeter

FLUKE 8842A Emulation Mode

4: R4 (200 kΩ range) 1: S1 (Medium reading rate) 0: T0 (Continuous trigger) The second digit, which can vary from 1 to 6, indicates what measurement range the

Meter is in regardless of whether the Meter is in autorange or manual range. The output string from a G0 command is acceptable as an argument for an "N" command.

This allows you to configure the Meter from the front panel and then record the configuration over the bus for future use with a P0 command.

G1 (Get SRQ Mask)

The G1 command copies the present SRQ mask into the output buffer in the format shown in Figure 7. The SRQ mask values are explained in Table 29. An example output string follows. For more information about the SRQ mask, see the “Status Data” section later in this section.

Example Explanation

33 CR LF Enable SRQ on any error or overrange.

G3 (Get User-Defined Message)

The G3 command loads the output buffer with the indentification string and calibration date of the Meter.

Example Explanation

FL8842A 10-8-2008 CR LF Identifies Meter and gives calibration date.

G4 (Get Calibration Status)

The command loads the output buffer with the instrument's calibration status in the format shown in Figure 7. The status is represented by a four-digit integer which is interpreted in Table 29.

The first two digits are always 1 and 0. The third digit indicates whether or not the calibration verification mode is enabled. The fourth digit indicates whether or not the calibration mode is enabled. Since the Meter can only be calibrated in 4040/4050 mode, the response to the G4 command in the Fluke 8842A emulation mode will always be

1000. Example Explanation

1000 CR LF 1: Leading 1

0: Leading 0 0: Not in cal verification 0: Cal mode disabled

G5 (Get IAB Status)

The G5 command loads the output buffer with the IAB status in the format shown in Figure 7. As Table 29 explains, the IAB status is a four-character string which indicates the status of the FRONT/REAR switch (front or rear analog inputs selected), the autorange feature (autorange on or off), and the OFFSET feature (OFFSET on or off). The first digit is always 1. An example output string follows.

Example Explanation

DMM4040/4050

Programmer Manual

G6 (Get YW Status)

1011 CR LF 1: Leading 1

0: FRONT inputs 1: Autorange off 1: OFFSET feature on It is useful to know whether autorange is on or off because this information is not

available from the G0 command. For example, the G0 command could indicate that the Meter was in the 200 mV range, but it would not indicate whether the Meter was in autorange or manual range

The G6 command loads the output buffer with the YW status in the format shown in Figure 7. The YW status is a four-character string which indicates which terminators are selected and whether the output suffix is enabled or disabled, as shown in Table 29. The first two digits are always 1 and 0. An example output string follows.

Example Explanation

1015 CR LF 1: Leading 1

0: Leading 0 1: Y1 (enable output suffix) 5: W5 (enable LF only)

G7 (Get Error Status)

The G7 command copies the error status register into the output buffer in the format shown in Figure 7. The first two digits are always 1 and 0. The second two digits represent the appropriate error code, if an error has occurred. (Error codes are listed in Appendix A). If an error has not occurred, the second two digits are 00. An example output string follows.

Example Explanation

1071 CR LF 1: Leading 1

0: Leading 0 71: Syntax error in device-dependent command string The G7 command gives the error status as it exists when the command is executed at its

position in the input string. The G7 command does not clear the error status register. For more information about error messages, see the Output Data section later in the section.

G8 (Get Instrument Identification)

The G8 command copies the Meter instrument identification into the output buffer in the format shown in Figure 7. The identification is represented by four comma separated fields that are interpreted in Table 29.

The first field indicates the manufacturer, the second indicates the instrument model number, the third is always the serial number, and the fourth indicates the version number of the IEEE-488 interface software.

Example Explanation

FLUKE,8842A,1234567,V5.0 CR LF This Meter is a Fluke 8842A with IEEE-488 interface

software version 5.0.

Digital Multimeter

FLUKE 8842A Emulation Mode

N (Numeric Entry Command)

Format Explanation N<numberic entry> Where <numeric entry> is one of the following: <signed integer> <signed real number without exponent> <signed real number>E<signed exponent> Example Explanation

“N12001” Enters the five-digit integer 12001 “N-1.23E2” Enters -1.23 x 10 “N+154.33E-1” Enters 1.5433 x 10

The N command enters numeric values for use with subsequent Put commands. The interpretation of the numeric value depends on which Put command it is used with.

The E can be used within an N command for entering an exponent of 10. The N can be used without an E, but an E requires a prior N. The exponent can be any integer from -9 to +9.

The mantissa may exceed 5-1/2 digits. The 8842A accurately calculates the appropriate exponent and then disregards all but the first 5-1/2 digits of the mantissa. However, a syntax error will occur if the numeric entry overflows the input buffer.

Example Explanation

“N123456789” Enters +1.23456 x 10

Put Commands

The Put commands P0 and P1 set up the configuration of the Meter and its operating modes by entering ("putting") information in the appropriate registers. The put commands are described further in the following paragraphs.

P0 (Put Instrument Configuration)

Format Explanation N<frst>P0 Where <frst> is a four-digit integer interpreted as

Example Explanation

“N3120 P0” Identical to F3 R1 S2 T0. Selects 2-Wire kΩ function,

The P0 command allows broadside loading of the Function, Range, Reading Rate, and Trigger Mode commands (F, R, S, and T). The codes for these commands are listed in Figure 6.

arguments for the F, R, S, and T commands.

200Ω range, fast sample rate, and continuous trigger.

A numeric entry for P0 must be within +1000 and +6824. Each of the four digits must not exceed its maximum allowed value (6, 8, 2, and 4, respectively) or an error message will occur and the instrument configuration will remain unchanged. The entry may be expressed as an integer, real number, or real number with exponent, as described under the N command. Any fractional part is ignored.

Example Explanation

“N3112 P0” Sets the Meter to F3, R1, S1, and T2.

DMM4040/4050

Programmer Manual

P1 (Put SRQ Mask)

Format Explanation N< SRQ mask >P1 Where < SRQ mask> is a two-digit integer from 00 to

63.

The P1 command is used to program the 8842A to make service requests on user-specified conditions. The two-digit code for the SRQ mask is interpreted in Table 29 under the G1 command. For more about the SRQ mask, see the “SRQ Mask” section later in this section.

Numeric entries for the P1 command must be between 0 and +63 (inclusive), or an error will occur and the SRQ mask will remain unchanged. The entry may be expressed as an integer, real number, or real number with exponent, as described under the N command. Any fractional part is ignored.

Example Explanation

“N0.17E+2 P1” Sets SRQ mask to 17. Enables SRQ on data available

or overrange.

“N1 P1” Sets SRQ mask to 01. (A leading zero is assumed.)

Enables SRQ on overrange.

Rn (Range Commands)

The Range commands duplicate the front panel range buttons. For example, R0 selects autorange, and R3 selects the 20V/20 kΩ range.

The R7 command turns autorange off, just as the RANGE button does when it is toggled. Command R7 puts the Meter into manual range, selecting whatever range the instrument is in when the command is received.

The Meter defaults to R0 on power-up and any device-clear command (*, DCL, or SDC). The range setting can be read using the G0 command.

Sn (Reading Rate Commands)

The 8842A defaults to S0 on power-up and any device-clear command (*, DCL, or SDC). The reading rate can be read using the G0 command. The reading rate command also selects the number of digits displayed and the filter setting.

Tn (Trigger Mode Commands)

The Trigger Mode commands duplicate the front panel TRIG button. In addition, the commands can enable or disable the automatic settling time delay.

The front panel TRIG button is enabled only while the instrument is under local control.

In the continuous trigger mode (T0), triggers are initiated at the selected reading rate. Each new reading is loaded into the output buffer as it becomes available, unless the Meter is busy sending previous output data.

Note

The trigger mode can be read using the G0 command. The Meter defaults to T0 on both power-up and any device-clear command (*, DCL, or SDC).

Tektronix DMM4040, DMM4050 Programmer

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Tables

List of Figures

Remote Operation

Introduction

Safety Information

Symbols and Terms

Safety and Electrical Symbols

Local and Remote Operation

Computer Interfaces

Optimizing System Speed for I/O Operation

Selecting the Remote Interface Port

Configuring the IEEE-488 Port

IEEE-488 Operating Limitations

Setting the IEEE-488 (GPIB) Port Address

Capability Commands

Interconnections

Configuring the RS-232 Port

Setting RS-232 Baud Rate

Setting RS-232 Parity and Data Bits

Setting RS-232 Stop Bits

Setting RS-232 Flow Control

Setting RS-232 End-Of-Line Character

Enabling and Disabling Fluke 45 Emulation Echo

RS-232 Modes of Operation

DMM4040/4050 Mode

Selecting Between Computer and Terminal Mode

Fluke 45 Mode

Interconnections

Fluke 8842A Emulation Mode

Configuring the Ethernet (LAN) Port

Setting the IP Address

Selecting Dynamic Host Configuration Protocol (DHCP)

Setting a Static Internet Address

Setting the LAN Subnet Mask

Reading the Domain Name

Configuring the Host Name

Reading the MAC Address

Configuring the LAN Default Gateway

Configuring the General Network Socket Port

Establishing an Ethernet Connection

Terminating an Ethernet Connection

Selecting the Programming Language

Getting Started With an Installation Test

Installation Test for RS-232 Connections

Installation Test for IEEE-488 Connections

If the Test Fails

How the Meter Processes Input

Input Strings

Input Terminators

Typical IEEE-488 Input Strings

Sending Numeric Values to the Meter

Sending Command Strings to the Meter

How the Meter Processes Output

Triggering Input

Internal Triggering

Service Requests (IEEE-488 Only) and Status Registers

External Triggering

Standard Event Status and Standard Event Status Enable Registers

Questionable Data Event Register and Questionable Data Enable Register

Status Byte Register

Reading the Status Byte Register

Supported SCPI Commands

Service Request Enable Register

SCPI Command Summary

SCPI Command Details

Using the MEASure? Command

Using the CONFigure Command

Setting Range and Resolution Parameters

Using the READ? Command

Using the INITiate Command

Using the FETCh? Command

Using the SENSe Subsystem to Configure the Meter

Programming for Math Operations

Programming the Trigger System

Using the Triggering Commands