Tektronix 213 Reference manual

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Model 213 Quad Voltage Source

Quick Reference Guide

A GREATER MEASURE OF CONFIDENCE

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INTRODUCTION

This quick reference guide contains descriptions of the features and operation of the Model 213. Also included is a programming example using a PC controller.

Olggo. Keithley Instruments, Inc.

Cleveland, Ohio, U. S. A.

Document Number: 213-903-01 Rev. A

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SAFETY WARNINGS ....................... 5

FRONT PANEL FAMlLtARtZATlON ........... 7

REAR PANEL FAMlLlARlZATtON ............. 9

DIP SWtTCH ......................... 9

ANALOG OUTPUT PORTS .............. 9

DlGtTAL INPUT/OUTPUT PORTS ........ 10

BASIC OPERATION ....................... 13

DAC PORTTRIGGERING ............... 13

INTERNAL SUFFER ................... 14

CONTROL MODES .................... 16

IEEE-488 PROGRAMMING .................. 19

DEVICE-DEPENDENTCOMMANDS ...... 19

SRQ MASK AND SERIAL POLL BYTE ..... 31

STATUS WORDS ..................... 32

KEYBOARD CONTROLLER PROGRAM ....... 38

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SAFETY WARNINGS

The following safety warnings should be obsewed before using Model 213 Quad Voltage Source. Refer to main manual for detailed safety information and complete operation instructions.

The Model 213 Quad Voltage Source is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read over the manual carefully before using the instrument.

Before operating the instrument, make sure the line cord is connected to a properly grounded power receptacle.

Exercise extreme caution when a shock hazard is present. Lethal voltages may be present on connsctorjacks. The American National Standards fnstitute (ANSI) states that a shock hazard exists when voltage levels greater than 30V FtMSor42.4Vpeakare present. Agoodsafety practice Is to expect that hazardous v&age Is present In any unknown clrcuii before measuring.

Inspect the connecting cables, test leads, and jumpers

for possible wear, cracks, or breaks before each use. For maximum safety, do not touch the Quad Voltage

Source connections, test cables or connections to any other instruments white power is applied to the circuit under test. Turn off att power and discharge any capacitors before connecting or disconnecting cables or jumpers.

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Do not touch any object which could provide a current path to the commonside ofthecircuit undertestorpower line (earth) ground.

Do not exceed the maximum signal levels of the instrument, as shown on the rear panel and as defined in the

specifications and operation section of the instruction

manual.

tnstrumentation and accessories should not be con-

nected to humans.

Maintenance should only be performed by qualified SBW ice personnel. Before performing any maintenance, dis-

connect the line cord and all test cables from the instru-

ment.

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FRONT PANEL FAMILIARIZATION

Six LEDs on the front panel of the Model 213 Quad Voltage Source disolav the status of the interface fsee Figure 1).

Ffgure 1.

TALK-On when the unit is in the talker state, off whsn the unit is in the idle or listener state.

LfSTEN - On when the unit is in the listener state, off

when the unit is in the idle or talker State. SRQ - On when the unit has generated a service Is-

quest. oft when no SW is pending. (See Service Re-

quest Mask command for more information.) ERROR-On when an error has occurred, off when no

error condition exists. (See Error Query command for more information.)

Front Panel Indicators

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TEST - Used in conjunction with the Test command to verify that communication. ..__ ___, unit. The TEST light will flash wher in the auto-calibration mode. It will then remain tit when finished.

POWER-On when power is applied to the unit and the power switch on the back panel is in the on position (depressed). Off if power is not present.

n haa haen established with the

I the unit is calibrating

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REAR PANEL FAMILIARIZATION

DIP SWITCH

The Model 213 hasone S-position switch @WI) accessible from the rear panel. This switch determines the unit’s IEEE address and its operating mode (normal or autocalibration). The switch is read only when the unit is powered on and should be set prior to applying power. Figure 2 illustrates the factory default setting for SWI,

Figure 2.

SW1 Factory Default Setttngs

ANALOG OUTPUT PORTS

The Model 213 can be thought of as four isolated digital to analog converters occupying one IEEE-488 bus address. Each port has a low (L), high (H), and ground

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(chassis ground) line. Cha*sis ground may be connected lo the shield of shielded cable if this type of cable is used lo carry the analog signals.

The maximum common-mode input

CAUTION

voltage (the voltage between output LO and chassis ground) Is 500V peak. Exceeding this value may damage the Interface.

The pinouts for all four analog ports are labeled on the real panel of the unit and are shown in Figure 3. Each analog output is capable of sourcing and sinking a maximum current 0, ,OrnA.

PORT 1 PORT? PORT 3 PORT4 HLG HLG HLG HLG

. . . . . . . . . . . .

Figure 3. Analog Output Connector Pinout

DIGITAL INPUT/OUTPUT PORTS

The Model 213 has eight digital input lines and eight digital output lines.

Figure 4 illustrates the digital I/O edge connector as viewed from the rear of the instrument.

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The digital output lines will drive two TTL loads. All digital input lines are less than 1.5 TTL loads. Normal precau-

tions should be taken to limit the input voltages to -0.3 to

+i’.O volts. All IWO lines are referenced to digital ground (pin 20).

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In addition to interfacing with TTL logic Iewts, the digital

output lines can be configured es high voltage/high cur-

rent outputs. These outputs can sink up to 1 OOmA at WV DC through the use of open collector drivers with integral diodes for inductive load transient suppression. This allows for interfacing the digital outputs with relays. lamps and solenoids.

To configure the digital output lines for this purpose, it is necessary to open the enclosure and reposition the configuration jumper according to the procedure in Section 6 of the Model 213 Instruction Manual.

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BASIC OPERATION

DAC PORT TRIGGERING

Triggering is the process of changing a DAC output at the ccwrrence of a trigger event. The three trigger events which can trigger a DAC port are: a Command Trigger (@), an IEEE Group Execute Trigger (GET), or an external trigger pulse applied tc the external trigger/SK2 input. Any DAC port may be configured to trigger on one or

more of these trigger sources. These trigger sources and

their relationship to a DAC port are shown in Figure 5.

As shown in the diagram, the trigger sources are routed to the ports using the trigger mask commands. The trigger mask commands are illustrated as switches. They are used to enable a trigger source to trigger the selected

DAC port. All trigger signals are then combined to allow a port tc be triggered upon the occurrencs of any of the

three trigger events.

Operation of the Model 213 is controlled by an internal

lmssc timer. Each DAC port is updated at a maximum rate of cnce every millisecond. When a trigger event cccurs, the DAC will output the programmed voltage within

1 msec of receiving the trigger.

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Figure 5. Model 213 Trigger Structure

INTERNAL BUFFER

The Model 213 contains an internal buffer consisting of 81921ocations numbered 0 to 8191. The bufferisshared by all ports. Each port may be given a different section of the buffer or ports may use the same buffer locations without conflict.

This buffer may be loaded with voltage values to be output when the stepped or waveform modes are used. All

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data in the internal b”“W is SaYed in non-volatile RAM. Therefore bufferdatawhichwaspreviously loaded will be

available at power on.

Figure 6 shows the factory default allocation of the inter-

nal buffer to each of the DAC

ports on the Model 213.

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CONTROL MODES

Four modes of DAC port operation are available: direct,

indirect, stepped, and waveform. Each port is independenf and may be operated in a different mode.

Direct Control Mode

In the direct control mode, a DAC voltage is output upon receipt of the Execute (X) command. Direct control is ac-

complished by selecting the DAC port, the range or autorange, specifying the DAC output voltage. and issu-

ing the Execute command.

Indirect control implies that the DAC output will change only when a trigger event occurs. Indirect control is accomplished by selecting ihe DAC port. the rang8 or autorange, specifying the DAC output voltage and the desired trigger source. When the trigger event occurs, the programmed voltage will be output.

Stepped Mode

In this mode, a sequence of DAC voltages is loaded into the Model 213 internal buffer. After the voltages are

loaded into the buffer, the DAC output can then be stepped through each of the values by using any of the three trigger sources. When the last voltage in the buffer

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is output, th@ Model 213 will automatically return to the first location, thereby allowing the sequence to be repeated. See Figure 7.

Figure 7. Example of Stepped Mode

Waveform Mode

The waveform control mode may be used tc control the DAC in an automatic manner. A buffer is defined and voltage values are loaded into the buffer. Once the Model 213 is triggered, these preloaded voltage values are then output at a regular interval. See Figure 8.

When’the last voltage in the buffer is output, the Model 213 will remain at that location if the number of cycle has been reached. The voltage stored at this location is then output continuously. lfthespecified number of cycles has

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“cl been reached, the Mode, 213 a”,CmatiO~ll~ CO”ti”UBS a, the first buffer location.

Flgure 8.

Example of Waveform Mode

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IEEE-488 PROGRAMMING

DEVICE-DEPENDENT COMMANDS

Trigger (system command)

Autorange (port command)

A0 Al (default) Enable autorange for selected DAC port A?

Command trigger. Triggers the ports in the command trigger mask (Tmask). This command does not require the Execute Ixl command to owate.

Disableautorangefor selected DACpoll Returns current autorange setting.

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lufter Data port command)

Png,volts Write volts value in buffer location for kng,#val Write decimal bit value in buffer location ~mg,#$valZ Write hexadecimal bit value in buffer lo3?

Control Mode (wart command)

CO (default) Direct mode Cl C2 Steooed mode C3 C?

selected DAC port. for selected DAC port. cation for selected DAC port.

Returns the range and value at the location pointer for the selected DAC port in the format specified by the Output For-

mat (On) command.

NOfS%

1. This command increments the location counter after the value is written lo or read from the buffer.

2. Factory default vlaues are mg=O, volts=0.

3. Valid values are mg=O-3, volts=

number without a V mefix.

Indirect mode

.~.

Waveform mode Returns current control mode for selected port Notes:Selecting a control mode slops the prior mode activity and rearms the Dart for the selected mode.

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outputs the value on the digital outpuf Returns the current value of the digital

-1

Error Status Codes: EO

El E2

:: E5

Noies:’

1. Default o”ta”t value = 0

2. “a, = o-25<.

Returns the error status which indicates

No error Invalid command Invalid command parameter

Command conflict

Calibration write protected Non-volatile RAM error Nofes: Upon reading the error status ths

errnr is rlalrad

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the selected port. 0 c start 5 8191; 1 5

Returns the starting buffer location and number of locations used in the defined buffer. No&s: The sum of stari+size must be less than or equal to 8192. The default

values are o,, 024; 1024, 1024; 2048.

1024: and 3072,1024 for ports 1 thru 4 respectively.

Get Trigger Mask (system command)

Gmask Sets bits in the GET trigger mask which

G-mask Clears the specified bits in the GET trig-

The mask bits are as follows:

Bit 0 Enable trigger to DAC port 1 (1). Bit 1 Enable trigger to DAC port 2 (2). Sit 2 Bit 3

specifies which ports will be triggered upon receipt of a bus GET command.

germask. Clears all bits in the GET trigger mask.

Returns current GET trigger mask.

Enable trigger to DAC port 3 (4). Enable trigger to DAC pon 4 (8). Nofss: The default mask value is 0.

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oftset Catlbr*ttOn (port command)

Hval H? Returns the o”set constant for selected

IlltWWil (port command)

It Specify time interval (in milliseconds)

I? Returns the current interval.

Specifies the offset constant for selected range and port. Range is f255.

range and port. Notes: Calibration constants must be programmed while using the direct control mode (CO). Autorange must be disabled to program calibration constants. The current voltage output is retriggered upon execution of this command. Default

“lll,FI is n

used with the waveform control mode. Range fort is i-65535.

Notes: The default value is 1000 (1 sec-

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Mn Callbratlon port command)

Ipos, neg Specifies the gain constant for both Po-

I? Returns the gain constants for selected

LocatIon Pointer

Jport command)

LWI Specifies the current buffer location. L? Returns the current buffer location in the

larities of the selected range and port. pos and neg = O-255.

range and port. Notes: Calibration constants must be programmed while using the direct control mode (CO). Autorange must be disabled (AO) to program calibration constants. The current voltage output is retriggered upon execution of this command. Default “alws are 128. 128.

Returns the current EOI control setting.

Range for val is O-8191.

format specified by the Output Format

(On) command. The value returned after an L? is the first location that will be used in stepped and waveform modes.

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Service Request Mask

&stem command)

Mmask Sets bits in the service request mask

M-mask Clears the specified bits in the service reMO Clears all bits in the service request M? Returns currant service request mask.

The mask bits are as follows:

Bit 0 Enable SRQ on DAC port 1 ready for trigBit 1 Enable SRQ on DAC port 2 ready for trigBit 2 Bit 3 Bit 4

Bit 5 Bit 7

Number of Cycles

jport command)

Nval Specifies the number of cycles through

which specifies which Model 213 events will generate a bus service request.

quest mask. mask.

ger (1). w

(2).

Enable SRQ on DAC port 3 ready for trig

w (4).

Enable SRQ on DAC port 4 ready for trig-

ger (a).

Enable SRQ on Trigger Overrun (16). Enable SRQ on ( Enable SRQ on II XII

the buffer in the waveform mode. “al is O-65535, where 0 is continuous.

Returns the number of repetitions speci-

fied for use in the waveform mode.

Notes: The default value is 1.

war (32). External input transition

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{system command) OO(default) Sets output format to volts in flO.0000

is: 07 Returns current output format selected.

Pt (default) Select DAC port 1.

(fixed). Sets output format in volts in decimal bits. Sets output format in volts in hexadecimal bits.

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External Trigger Mask (system command)

Qmask

Q-mask 00 Q?

The mask bits are as fellows: Bit 0 Bit 1 Bit 2

Bit 3 Bit 7

Sets bits in the external trigger mask which specifies the active edge of the w

ternal input line and which ports will be triggered upon a transition of that line. Clears the specified bits in the external trigger mask. Clears all bits in the external trigget

mask.

Returns current external trigger mask.

Enable trigger to DAC port 1 (1).

Enable trigger to DAC port 2 (2).

Enable trigger tc DAC port 3 (4).

Enable trigger to DAC pod 4 (8).

External input line edge sense: (128)

l=negative edge triggered O=positive edge triggered

Notes:The bit 7 default value is 0.

RI (default) Select DAC *IV range. RI (default) Select DAC *IV range.

Select DAC -tW range. Select DAC *IO” range.

Returns DAC ““I+ rnnn~

Notes:This cc

Notes:This command should not be used

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Saves the current settings as default valRestores Gain and Offset cal constants.

Saves current calibration constants to Returns the last Sn command executed.

Command Trigger Mask (system command)

Tmask

T-mask TO

Sets bits in the command trigger mask which specifies which ports will be trig gered upon receipt of a trigger command

(@).

Clears the specified bits in the command trigger mask. Clears all bits in the command trigger

mask. Returns current command trigger mask.

The mask bits are as follows: Bit 0 Sit 1 Sit 2 Sit 3

Enable trigger lo DAC port 1. Enable trigger to DAC port 2. Enable trigger to DAC port 3. Enable trigger to DAC pod 4. N&s: The default value is 0.

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(system command)

Send system status on talk.

i? K

u4 ifi

u7 U8 (default) Returns programmed output voltage and

Value output (port command)

VVOltS V#Kl

V#$KlZ V?

Send DAC port 1 status on talk. Send DAC port 2 status on talk. Send DAC port 3 stat”~ on talk. Send DAC port 4 status on talk. Send digital input port status on talk. Send overr”” status on talk.

Returns actual output voltage and range.

range.

Returns current status select setting. Notes: All status commands are one

shot.

Write volts value for selected DAC port Write decimal bit value for selected DAC PO*. Write hexadecimal bit value for selected

DAC port.

Returns current range and value for selected port in the format specified by the Output Format (On) command.

Notes: The urrent autorange and range affect the value. When programming in bits. autorange must be disabled. The digital port must be programmed in bits.

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WO (dsfault)Turn off TEST LED.

-1

Execute (system command)

Bus Terminator

{system command)

YO(default) Bus terminator is carriage return lins

Execute command string.

feed. Bus terminator is line feed carriage return. Bus terminator is carriage return only. Bus terminator is line feed only.

Returns current bus terminator setting.

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SRQ MASK AND SERIAL POLL BYTE

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STATUS WORDS

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UO System Status (Cont.)

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Figure 11. WI-U4 Port Status

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U5 - Digital Input Port Status

nnn u

Fioure 13. U6 Overrun Status

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C#P#R#ViC##.#####

1 = OAC pm 1 *=oACpart2 3=OACport3 ‘l=LMCip0*4

Flgure 14. WActuaI Output Voltage and Range

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A#C#P#R#Vzt##.#####

1=OAcport1 2~oACpon2 3 _ OAC part 3 4-oACporl4

Figure 16. U6 Programmed Output Voltage and

Ftanoe

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KEYBOARD CONTROLLER PROGRAM

The keyboard controller program is a simple BASIC program that accepts commands from the PC keyboard and sends them to an IEEE-488 interface with the IOtech

Driver488 software. It then displays any responses on the PC screen. The keyboard controller program is aconvenient method of exercising the Model 213 and becoming familiar with the commands and their actions.

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Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of

Keithley Instruments, Inc. All other trademarks and trade names are the property of their respective companies.

Keithley Instruments, Inc.

28775 Aurora Road • Cleveland, Ohio 44139 440-248-0400 • Fax: 440-248-6168

1-888-KEITHLEY (534-8453) www.keithley.com