BK Precision BK Precision 4033 Manual

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Model: 4033, 4034

50 MHz Programmable Pulse

USER MANUAL

99 Washington Street Melrose, MA 02176

Phone 781-665-1400 Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Generator

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135

93 MTA29

175

125 } MSA29,PPD

136

94 ^ MTA30

176

126 ~ MSA30,PPD

137

95 _ UNT

177

127

DEL

Message Definitions

PPE

Parallel Poll Enable

SPE

Serial Poll Enable

PPU

Parallel Poll Unconfigure

TCT

Take Control

SDC

Selected Device Clear

UNL

Unlisten

SPD

Serial Poll Disable

UNT

Untalk

4.16 RS-232 Pr o g ramming

4.16.1 General

The INSTALLATION se ction of this manual describes the RS-232-C con nection for the instru ment. Be sure that you have the Remote Mode set to RS-232 and correctly set the baud rate.

EIA standard RS-232-C specifies the electrical characteristics and pin out of a serial communication standard for connecting "data terminal equipment" (DTE) to "data communication equipment" (DCE). Data terminal equipment is usually devices such as terminals, computers, or printers that are the final destination for data. Data communication equipment, on the other hand, is usually a modem or other device that converts the data to another form and passes it through. The instrument can be configured only as a DCE, so in most cases it can be connected with a strai ght-through cable to a computer, but would require special cabling to connect to another DCE device.

The baud rate is the bit rate during the transmission of a word in bits per second. Different devices use many baud rates, but the baud rates of the two devices that are connected must be the same. The instrument can be set to different baud rates ranging from 1200 to 115,000 as described in Section 3, Operating Instructions.

Data signals over the RS-232-C use a voltage of +3V to +25V to represent a zero (called a space) and a voltage of

-3V to -25V to represent a one (called a mark). Handshake and control lines use +3V to +25V to indicate a true condition and -3V to -25V to indicate a false condition. When no data is being transmitted , the idle state of the data lines will be the mark state. To transmit a byte, the transmitting device first sends a start bit to synchronize the receiver .

4.16.2 RS-232-C Operation

The RS-232-C standard is not ve ry specific about many of the handshaking si gnals and it i s therefore usually necessary to refer to the manuals for both of the devices being connected to determine the exact pin out, signal definition, and signal direction for the devices.

The serial interface implements the same SCPI command set as the GPIB interface. The instrument is programmed by sending ASCII coded characters to the instrument. When the instrument is in the remote mode remote command input has priority over any front panel control. Therefore, as long as the serial interface is continuously supplied with data, the keyboard will appear to be inoperative to the user.

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Before connecting the line cord to the AC mains, check the rear panel AC line

line voltage other than the indicated voltage can

destroy the AC line fuses. For continued fire protection, replace fuses only with

static discharge

(ESD). To avoid damage, be sure to follow proper procedures for handling, storing

sensitive

This product is subject to Directive 2002/96/EC of the

Electrical Shock hazard.

CAUTION:

voltage indicator. Applying a

CAUTION:

those of the specified voltage and current ratings.

This product uses components which can be damaged by electroand transporting parts and subassemblies which contain ESD-

components.

Compliance Statements

Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other European countries with separate collection systems)

European Parliament and the Council of the European Union on waste electrical and electronic equipment (WEEE) , and in jurisdictions adopting that Directive, is marked as being put on the market after August 13, 2005, and should not be disposed of as unsorted municipal waste. Please utilize your local WEEE collection facilities in the disposition of this product and otherwise observe all applicable requirements.

Safety Symbols

Connect to safety earth ground using the wire recommended in the user manual.

This symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.

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Table of Contents

Safety Summary .............................................................................................. 2

Section 1 .......................................................................................................... 6

Introduction ........................................................................................................................ 6

1.1 Introduction .............................................................................................................................................. 6

1.2 Description ............................................................................................................................................... 6

1.3 Safety Remarks ....................................................................................................................................... 6

1.4 Package Contents ................................................................................................................................... 6

Specifications ..................................................................................................................... 6

Section 2 .......................................................................................................... 9

Installation .......................................................................................................................... 9

2.1 Introduction .............................................................................................................................................. 9

2.2 Mechanical Inspection ............................................................................................................................. 9

2.3 Initial Inspection ....................................................................................................................................... 9

2.4 Instrument Mounting ................................................................................................................................ 9

2.5 Product Dimensions ................................................................................................................................ 9

2.6 Power Requirements ............................................................................................................................. 10

2.7 Grounding Requirements ...................................................................................................................... 10

2.8 Signal Connections ................................................................................................................................ 10

2.9 RS-232 Connection ............................................................................................................................... 13

2.10 RS-232 Configuration .......................................................................................................................... 14

2.11 GPIB Address ...................................................................................................................................... 14

2.12 GPIB Connections ............................................................................................................................... 14

Section 3 ........................................................................................................ 15

Operating Instructions .................................................................................................... 15

3.1 General Description ............................................................................................................................... 15

3.2 Display Window ..................................................................................................................................... 16

3.3 Front Panel Controls .............................................................................................................................. 17

3.4 Back Panel Controls .............................................................................................................................. 17

3.5 Output connectors ................................................................................................................................. 19

3.6 MENU Keys ........................................................................................................................................... 19

3.7 ON Key .................................................................................................................................................. 29

3.8 Cursor Movement Keys ......................................................................................................................... 29

3.9 Rotary Input Knob .................................................................................................................................. 29

3.10 Power-On Settings .............................................................................................................................. 29

3.11 Memory ................................................................................................................................................ 30

3.12 Displaying Errors ................................................................................................................................. 30

3.13 Pulse Definitions .................................................................................................................................. 31

3.14 Pulse Parameter Limitations ................................................................................................................ 32

3.15 Pulse Definitions .................................................................................................................................. 33

Section 4 ........................................................................................................ 35

Programming .................................................................................................................... 35

4.1 Overview ................................................................................................................................................ 35

4.2 Device State .......................................................................................................................................... 36

4.3 Interface Function Subsets .................................................................................................................... 37

4.4 Device Address...................................................................................................................................... 37

4.5 Message Exchange Protocol ................................................................................................................. 37

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4.6 Instrument Identification ........................................................................................................................ 38

4.7 Instrument Reset ................................................................................................................................... 38

4.8 Self Test ................................................................................................................................................. 38

4.9 Command Syntax .................................................................................................................................. 39

4.10 Status Reporting .................................................................................................................................. 41

4.11 IEEE 488.2 Common Commands and Queries ................................................................................... 45

4.12 Instrument Control Commands ............................................................................................................ 48

4.13 IEEE 488.1 Interface Messages .......................................................................................................... 64

4.14 SCPI Command Tree .......................................................................................................................... 65

4.15 ASCII and GPIB Code Chart ............................................................................................................... 67

4.16 RS-232 Programm ing .......................................................................................................................... 69

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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Section 1

MODELS

4033

4034

CHANNELS

FREQUENCY

0.1 Hz to 50 MHz

TIMING CHARA CTERISTICS

PERIOD

Range (single pulse)

20 ns to 10 s (50 MHz to 0.1 Hz repetition rate)

Range (double

40 ns to 10 s (25 MHz to 0.1 Hz repetition rate)

Introduction

1.1 Introduction

This manual contains information required to operate, program, check, and maintain the 50 MHz programmable pulse generator.

1.2 Description

The Model 4033 and 4034 are a high performance programmable pulse generators. The instrument generates pul s e with a repe tition rate to 50 MHz, width from 10 n s, var ia ble delay, variable transitio n times and amplitude. The pulses can be output in continuous, trigge red, gated , or burst mode with an int ernal or external trigger signal.

The model 4033 and 4034 can be remotely operated via RS232 or GPIB interface bus and is SCPI compatible.

1.3 Safety Remarks

The model 4033 and 4034 are SAFETY CLASS 1 instruments. Before operation, review the safety summary at the beginning of the manual.

1.4 Package Contents

The following list of items and accessories come in the package:

1. 4033 or 4034 Pulse Generator

2. AC power cord

3. CD containing use r man ual

4. Test report and certificate of calibration

5. RS-232 Serial Cable

Specifications

NOTE

Specifications listed in manual are ap plicable after a powered 30 minute warm-up into a 50 Ω load

All timing characteristics are measured at 50% of amplitude with fastest edge Specifications are verified according to the performance check procedures. Specifications not verified in the manual are either explanatory notes or general performance characteristics only. Specifications and information is subject to change without notice. For the most current and correct data please visit www.bkprecision.com

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pulse)

Resolution

Up to 6 digits, limited to 10 ps

Accuracy

± 0.01 %

Jitter

< 0.01 % of setting +20 ps on Period, Width and Delay

WIDTH

Range

10 ns to (Period – 10 ns)

Resolution

Up to 6 digits, limited to 100 ps

Accuracy

(0.5% of setting +500 ps)

Double Puls e

(0.5% of setting +3 ns) for the second pulse

DELAY

Range

0ns to (Period – Width – 10 ns)

Resolution

Up to 6 digits, limited to 100 ps

Accuracy

±(0.5% of setting +500 ps)

DUTY

CYCLE

Range

1 to 99%

Resolution

3 digits (0.1%)

Accuracy

Limited by width and pulse accuracy

OUTPUT CHARACTERISTICS

AMPLITUDE

High Level

-9.90 V to +10 V into 50 ohms load (-19.80 V to +20 V into open circuit)

Low Level Range

-10 V to +9.90 V into 50 ohms load (-20 V to +19.80 V into open circuit) Amplitude R ange

0.1V to 10V p-p into 50 ohms load (20 Vp-p max into open circuit)

Resolution

3 digits limited to 10 mV

Accuracy

1% of setting ± 10 mV into 50 ohms

Aberrations

<5% + 20 mV into 50 ohms load, for pulse levels between ±5 V

Output Resistance

50 ohms Offset Accuracy

1% ± 25 mV

OPERATING MODES

Continuous

Output continuous at programmed period rate

Output quiescent until triggered by an internal, external, GPIB or manual

Same as triggered mode except pulses are output for the duration of the gated signal. The last cycle started is completed

Same as triggered mode for programmed number of cycles from 2 to

External Width

Trigger duration and rate sets pulse width and repetition

PULSE FUNCTIONS

Single

One pulse at each selected period up to 50 MHz repetition rate

delay control.

TRANSITION T IMES

<6 ns to 10 ms variable. Leading and trailing edges settable separately and

Resolution

3 digits limited to 10 ps

Accuracy

(5% of setting +2ns)

<5% deviation from a straight line between 10% and 90% points, for transitions > 50 ns

INTERNAL TRIGGER

Range

100 ns to 100 s

Resolution

4 digits limited to 100 ns

INPUT AND OUTPUT

± ±

Range

Triggered

Gated

Burst

Double

Range

Linearity

trigger, then generates one cycle at programmed period rate

999,999 as set by the N-BURST function

One pair of pulses at each period up to 25 MHz repetition rate. Both pulses have the same selected width; the position of the second pulse set b y the

limited to 20:1 ratio between settin gs into one of the following ranges: 5ns100 ns; 50 ns-1.0 us; 500 ns-10 us; 5.0 us-100 us; 50 us-1.0 ms; 500 us-10 ms, 5 ms – 100 ms

Accuracy

± 0.01%

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TRIGGER

INPUT

Sensitivity

200 mVp-p minimum

Minimum Wi dth

10 ns

Maximum Rate

50 MHz

Input Imped ance

10 kΩ

Input Protection

+15V DC plus peak AC

Range

Selectable from -10 V to +10 V

Resolution

3 digits limited to 10 mV

Slope Selection

Positive or Negative

SYNC OUTPUT

level is >2 V into 50 ohms and with 3.5 ns typical transition times.

GPIB PROGRAMMING

Interface

GPIB and RS -232, IEEE-488.2 and SCPI compatible

GPIB Functi on Codes

SH1, AH1, T6, L4, SR1, RL1, PP0, DC1,DT1, C0, E2

GENERAL

Non volatile, stores up to 99 complete panel settings. Last user setup a lso

Dimensions WxHxD

8.4 x 11.8 x 3.5 inches (213 x 300 x 88 mm)

Net Weight

Approx. 3 kg

EMC

Conforms to EN55011 class B for radiated and conducted emissions

Electrical Discharge Immunit y

Conforms to EN55082

Safety Specifications

Conforms to EN61010, CE Approved

Operating Temperature

32 °F to 122 ° F (0 °C to 50 °C)

Storage Temperature

-4 ° F to 140 °F (-20 °C to 60 °C)

Humidity

90% RH at 32 °F to 86 °F (0 °C to 30 °C)

A TTL level pulse at the programmed period. Output impedance is 50 Ω, protected against short circuit a nd up to ±15 V accidental input. The high

Memory

Power Requi rements

retained at power down 100-240 V, ±10%, 48-66 Hz, 50 VA ma ximum

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Section 2

300 mm

213 mm

88 mm

Installation

2.1 Introduction

This section contains installatio n information, power requirements, initial inspection and signal connections for

Model 4033 and 4034.

2.2 Mechanical Inspection

This instrument was carefully inspected before shipment. Upon receipt inspect the in str ument for damage that might have occurred in transit. If there is d a mage d ue to shipping, file a claim with the car rier who transported the unit. The shipping and packing mater ia l should be saved if reshipment is required. If the original container is not to be used, then use a heavy carton box. Wrap the unit with plastic and place cardboard strips across the face for protection. Use packing material around all sides of the container and seal it with tape bands. Mark the box "FRAGILE".

2.3 Initial Inspection

After the mechanical inspection, verify the contents of the shipment (accessories). If the contents are incomplete, or

if the instrument does not pass the specification acceptance tests, notify the local service center. The unit is calibrated and ready for use upon receipt. For a detailed performance check procedure, please see section 5 of the manual.

2.4 Instrument Mounting

The model 4033 and 4034 programmable pulse generators are intended for bench use . The instrument includes a

front feet tilt mechanism for optimum panel viewin g angle. The instrume nt does not re quire special cooling when operated within conventional temperature limits. The unit can be installed in a closed rack or test station if proper air flow is assured. A 5 cm minimum clearance must be provided at the rear of the unit for proper convection cooling.

2.5 Product Dimensions

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2.6 Power Requirements

The model 4033 and 4034 can be operated from any source of 100-240V +/-10% AC, at a frequency from 48Hz to 66Hz. The maximum power consumption is 50 VA.

WARNING

THE LINE POWER VOLTAGE OF THE INSTRUMENT IS NOTED ON THE AC INPUT PLUG. TO PREVENT DAMAGE TO THE INSTRUMENT, CHECK FOR PROPER MATCH OF LINE VOLTAGE AND PROPER FUSE TYPE AND RATING.

The instrument power fuse is loc a te d in the AC input plug. To access the fuse, firs t disconnect the power cord and

then remove the fuse cartridge. Use T1A 250V fuse only, as labeled in the rear panel of the unit.

2.7 Grounding Requirement s

For the safe ty of operating personnel, the instrument mus t be grounded. The central pin on the AC plug grounds the

instrument when properly connected to the ground wire and plugged into proper receptacle. The power jack and the mating plug of the supplied power cable meet IEC safety standards.

WARNING

TO AVOID PERSONAL INJURY DUE TO SHOCK, THE THIRD WIRE EARTH GROUND MUST BE

CONTINUOUS TO THE POWER OUTLET. BEFORE CONNECTION TO THE POWER OUTLET, EXAMINE ALL CABLES AND CONNECTIONS BETWEEN THE UNIT AND THE FACILITY POWER FOR A CONTINUOUS EARTH GROUND PATH.

THE POWER CABLE MUST MEET IEC SAFETY STANDARDS.

2.8 Signal Connections

Use RG58U 50 Ω or equivale nt coaxial cables for all input and o utput signals to and from the instrume nt. Below specifies the BNC connectors on the instrument:

OUTPUT – Up to 10 Vpp into 50 Ω impedance (20 Vpp into open circuit). The instrument is protected from short circuit to ground.

TRIG IN – 10 kΩ impedance, selectable positive or negative slope, variable level from – 10 V to + 10 V. Input protected to ±15 V.

SYNC OUT – A positive pulse signal in phase with the main output. TTL levels with a 50 Ω source impedance and with 3.5 ns typical transition times.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Page 11

2.8.1 Maintaining Pulse Fidelity

( ) R Z R

R Z R

Z 1 2

1 2 2

R Z R

Z R

1 1 2

1 2

Due to the extremely fast pulse rise times obtained from the instrument, special consideration must be given to preserve pulse fidelity. Even at low repetit i on rates, high frequency compo nents are present in the output waveform. Use high quality coaxial cables, attenuators and terminations.

Note: RG 58 type coaxial cable and typical BNC connectors exhibit impedance tolerances which may cause visible reflections. For maximum fidelity, use short, high quality, 50 Ω coaxial cables.

When signal comparison measurements or time difference determinations are made, the two signals from the test device should travel through coaxial cables with identical loss and time delay characteristics.

When making connections that are not in a 50 Ω e nviro nment, keep all lead lengths short, 1/4 inch or less.

2.8.2 Impedance Matching

A mismatch, or different impedance in a transmission line, generates a reflection back along the line to the source. The amplitude and polarity of the reflection are determined by the load impedance in relation to the characteristic impedance of the cable. If the load impedance is higher than the characteristic impedance of the line, the reflection will be of the same polarity as the applie d signal. If it is lower, the reflection will be of opposite polarity. These reflections add or subtract from the amplitude of the incident pulse causing distortion and irregular pulse shapes.

Impedance-matching net wor k tha t pr o vid es mi ni mu m att e nu at io n

A simple resistive minimum attenuation impedance matching network that can be used to match the instrument output into relatively l ow impedance is shown in the abo ve figure. T o match impedance with t he illustra ted network, the following conditions must e xist :

and

Therefore:

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R Z Z Z1 2 2 1= −( )

R Z

Z Z

2 1

−

R1 125 125 50 968= − =( ) .

R2 50

125

125 50

64 6=

−

= .

EER

1 2

1= = +

ERRRZ

2 1

1 2

1 1

1= = + +

968

125

1 177= + =..

968 64 6

968

1 4 43= + + =

. .

R1 R2 = Z1 Z2, and R1 Z1 = R2 (Z2-Z1)

and

For example: to match a 50Ω system to a 125Ω system, Z1 equals 50Ω and Z2 equals 125Ω

Therefore:

Ω

and

Ω

Although the illustrat ed network provides minimum attenuation, for a purely resistive impedance-matching device, the attenuation as seen from one end does not eq ual that seen from the other end. A signal (E1) applied from the lower impedance source, encounters a voltage attenuation (A1) which is greater than 1 and less than 2, as follows:

A signal (E2) applied from the higher impedance source (Z2) encounters a greater voltage attenuation (A2), which is greater than 1 and less than 2 (Z2/Z1):

In the example o f matching 5 0Ω to 125Ω,

and

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DB-9 pin

Name

Note

D d

138

10=

log

Rt Rt Rt Rt= + + +( ) ( ) ( ) ......

The illustrated network can be modified to provide different attenuatio n ra tios by adding another resistor (less than R1) between Z1 and the junction of R1 and R2.

When constructing suc h a device, the environment surrounding the c omponent s should also be designe d to provide smooth transition between the impedances. Acceptable performance can be obtained with discrete components using short lead lengths; however, a full coaxial environment is preferred.

The characteristic impedance of a coaxial device is determined by the ratio between the outside diameter of the inner conductor to the inside diameter of the outer conductor expressed as:

2.8.3 Rise Time Measurements in Linear Systems

Consider the rise time and fall time of associated equipment when measuring the rise time or fall time of a linear device. If the rise time of the device under test is at least ten times slower than the combined rise times of the instrument, the monitoring oscilloscope, and associated cables, the error introduced will not exceed 1%, and usually may be ignored. If the rise time or fall time of the test device is less than ten times slower than the combined rise times of the testing system, determine the actual rise time of the device under test by using the following formula:

Rt equals the overall rise time or fall time of the entire measurement system and R1, R2, R3, etc. are the rise times or fall times of the individual components in the system.

2.9 RS-232 Connection

The rear panel RS-232 connector is a standard DB-9 male connector configured as a DCE. The pin assignments are defined in the table below:

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2 3 4 5 6 7 8

*Note: Use a Null-modem or cross over cable (pin 2 and 3 switched) in order to communicate with instrument.

TXD RXD

GND

RTS CRS

Transmit Data

Receive Data

Signal gro und

Request to Send

Clear to send

2.10 RS-232 Configuration

The instrument use 8 data bits, 1 stop bit, no parity and baud rate selectable from 2400 to 115K (2400, 4800, 9600, 19200, 38400, 57600, 115200). By default, the instrument is set at 19200-8-N-1.

Note: If 115K baudrate speed is used, ensure that the RS232 cable is short and can support this speed. Otherwise,

there may be some instability and intermittent data transmission failure between the interfacing comp uter and the instrument.

2.11 GPIB Address

The address can be changed from the front panel by using the "UTILITY" menu.

2.12 GPIB Connections

The rear panel GPIB connector is an AMPHENOL 57-10240 or equivalent, and connects to a standard IEEE-488

bus cable connector. The GPIB line screens are not isolated from chassis and signal ground.

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1 2 3 7 8

3.1 General Descripti on

This section describes the displays, controls and connectors of the Model 4033 and 4034 - Function Generators. All controls for the instrument local operation are located on the front panel. The connectors are located on both

front and rear panels.

Section 3

Operating Instructions

(Model 4034 only)

(Model 4033)

Figure 3.1 - Front Panel View

1. Power ON-OFF - Applies and removes AC power to the unit

2. Display Window - Displays all instrument data and settings on a LCD.

3. FI-F5 Keys - Select the menu options that appear on the bottom section of the LCD display.

4. Menu Keys - Select menu options for waveform parameters (PARAM), output levels

(OUTPUT), pulse edges (PULSE), tr igge ri ng mo d es (MODE), setup

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configurations (SETUP), and utility options (UTIL).

1 2 3 4 5 6 7

5. Numerical Keypad - Numeric entry keys for entering values for various functions and modes

6. Unit Setting Keys - Quick keys fo r setting units for fr equency, time, and ampl itude

7. Rotary Knob - Used to increment/decrement numerical values or to scan through the possible

selections.

8. Cursor Keys - Used to move the cursor (when visible) to e ither le ft or right when modi fying

values of various parameters.

9. Output ON - Controls the main output signal. In model 4033, the output status is ON when

display shows “Out On” and the button lights up. In Model 4034, display will show “On” next to “ch1” and/or “ch2” indicato rs dependi ng on which channel is selected to be on.

10. Channel Output - (model 4034) Dual BNC independent channel outputs (50 Ω) of pulse signal.

11. Output ON - (model 4033) Controls the main out put signa l . The output status is ON when

illuminated.

12. Channel Output - (model 4033) BNC channel output (50 Ω).

13. Sync Out - (model 4033) Sync out put, 50 Ω 5V TTL level. Sync out for dual channel model

4034 is located in the rear panel of the instrument.

14. CHAN Key - (model 4034 only) Cha nnel select key

15. MAN TRIG Key - Sends manual trigger pulse when p ushed (requires instrument to be in manual

trigger mode)

16. ENTER Key - Used for confirming parameter adjustments and settings.

3.2 Display Window

The pulse generator has a graphical LCD display that c a n d isplay up to 160 x 80 dots. When you power-on the unit a

parameter (Frequency) and its current settings appear in the display

function, parameter or mode display selected.

. The bottom displays a menu that corresponds to the

Figure 3.2 - LCD Display Screen

1. Channel/Output Display

Displays the current se lected channel (when highlighted). (For model 4034 only). Also displays highlighted text “Out On” when output is ON (For model 4033) or displays a highlighted text “On” next to “Ch 1” and/or “Ch 2” when either or both channel outputs are ON (For model 4034).

2. General Waveform Display

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Displays the general waveform be i ng generate d in the cha nnel.

Note: Waveform shown is approximated and scaled down. It does not show the exact representation of the waveform at the output.

3. DEL Mode Display

Displays delay setting of the pulse. Alternatively, it can also display other parameters in other menu items.

4. Menu Functions Display

Displays the menu options available. Use F1-F5 keys on front panel to select the options.

5. Secondary Parameter Display

Displays the values of parameters selected in the menu. Depending on the opti ons chosen, va rious para meters will displa y with a cursor for adjusting their values. For example, width or duty cycle can be displayed.

6. Main Parameter Display

Displays the main parameter value . When highlighted, it can be adjusted with numeric keypad or rotary knob. It can, for example, adjust frequency or period.

7. Mode Display

Displays the current mode of the generator . This can be the trigger mode of the power supply.

3.3 Front Panel Controls

The front-panel controls select, display, and change parameter, function, and mode settings. Use the rotary input knob and the cursor moveme nt keys to ent er data into the pulse generator.

To change a setting:

1. Press the key that leads to a required item.

2. Move cursor using cursor keys to the appropriate position in the numeric field.

3. Use the rotary input or the numerical keyboard to change the value of the displayed item. Changes take effect immediately.

The following subsections describe the function of each front panel key and connector.

3.4 Back Panel Controls

The pulse generator has 4 BNC Connectors on the rear panel where you can connect coaxial cables. These coaxial connectors are labeled accordingly and serve as carrier lines for input and output signals delivered to and from the pulse generator.

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Model 4034

11 3 8

10 9 5

Model 4033

1 3 4 5 6

Figure 3.3 - Back Panel View

1. Options 50 Ω - Reserved for future use.

2. Options TTL - Reserved for future use.

3. Trig In - Use this connector to appl y an external trigger or gate signa l, dependi ng on the waveform

generator setting, to the generator. Maximum input is ± 15 V.

4. CTRL IN - Not used

5. GPIB Interface - Use to interface with a computer via GPIB for remote communication.

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6. RS-232 Interface - This is a standa rd RS-232 port used for remote interface. Null modem or cross

serial cable is required to communicate with a PC via this port.

7. Ea rth GND - This screw is the earth ground that is tied to the chassis.

8. AC Power Co nnector - Used to connect power cable to AC line source.

9. Fuse Box - Fuse compartment. For replacement, use T1A, 250V fuse only.

10. Cooling Fan - To ensure proper cooling, please leave room between the fan output and other objects

with at least one feet distance.

11. SYNC OUT - (Model 4034 only). 50 Ω TTL sync output for channel 1.

12. TRI G IN an d SYNC OUT - (Model 4034 only). TRIG IN and SYNC OUT BNC connectors for

channel 2. SYNC OUT is a 50 Ω TTL level signal. TRIG IN accepts maximum ± 15 V.

3.5 Output connectors

The pulse generator output circuits operate as a 50 Ω voltage source working into a 50 Ω load. At higher frequenci es, un-terminated or improperly terminated output cause aberrations on the output waveform. In addition, loads less than

50 Ω reduce the waveform amplitude, while loads more than 50 Ω increase waveform amplitude. Excessive distortion or aberrations caused by improper termination are less noticeable at lower frequencies. To ensure pulse integri ty, follow these precautions:

1. Use good quality 50 Ω coaxial cable and connectors.

2. Make all connections tight and as short as possible.

3. Use good quality attenuators if it is necessary to red uce pulse amplitudes applied to sensitive circuits.

4. Use termination or impedance-matching devices to avoid reflections.

5. Ensure that attenuators and terminations have adequate power handling capabilities. If there is a DC voltage across the output load, use a coupling capacitor in series with the load. The time constant of the coupli ng capacitor and load must be long e nough to maintain pulse flatness.

Impedance Matching

If the wave form generat or is driving a high impedance, such as the 1 MΩ input impedance (paralleled by a stated capacitance) of an oscilloscope vertical input, connect the transmission line to a 50 Ω attenuator, a 50 Ω termination and to the oscilloscope input. The attenuator isolates the input capacitance of the device and terminates the waveform generator properly.

3.6 MENU Keys

These keys select the main menus for displaying or changing a parameter, function or mode. Below is the hierarchy and selections of the menu tree.

MENU TREE

- PARAM

o PERIOD | FREQ o WIDTH | DUTY o DELAY o I NDEP | CH1 (When CH2 is selected only) o SINGLE | DOUBLE

- OUTPUT

o HILVL o LOLVL o PREDEF

 ECL

Page 20

 TTL  CMOS  USER

o OUTPUT LIMITS

- PULSE

o RISE o FALL o EQUAL o NO RM | COM P L

- MODE

o CONT o TRIG

o GATE

o BURST

o EXTWID

- SETUPS

o RECALL o STORE o CLEAR ALL

- UTIL

o GPIB (ACTIVE) (GPIB Address ) o RS232 (ACTIVE) (Baudrate) o INTEN o POWER (Power On Setup)

 HIPRED | LOPRED  LIM OF

 LIM ON  HILIM  LOLIM  PREV

 MAN (Manual Trigger)  INT (Inter nal Trigger Rate)  EXT (External Trigger)  PREV

 MAN (Manual Gate Trigger)  INT (Inter nal Gate Trigger Rate)  EXT (External Gate Trigger)  PREV

 MAN (Manual Burst )  INT (Internal Burst Rate)  EXT (Burst External)  NBRST (Number of Burst s )  PREV

3.6.1 PARAMETER Menu

This key selects and displays the waveform frequency, amplitude, offset and external reference and allows changin g th e parameter data.

Frequency Menu

F1: PERIOD/FREQ - Selects and displays the period or the pulse frequency. Change the values using the

cursor keys, rotary knob or numerical keys. If a certain setting can't produce the waveform at the desired parameters, the generator displays an error message. While the

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Page 21

pulse mode is set to external width on, the value of the period may be changed but the value is not displayed, since the actual value of the period is set by the external pulse

F2: WIDTH/DUTY - Selects and displays the pulse width and duty cycle. The minimu m va l ue of the wid th

is 10ns, with the maximum value dependent on the values of the period, delay and transition times. The Duty Cycle is defined as the ratio of the p ulse width to the pulse period. C hanging the duty cycle will therefo re change t he width accordingly. The duty cycle has both a value and a state (on or off). On Power On the duty cycle is off. This means that the width is determined by the width parameter only. The duty cycle is set to ON by entering a value. The value may then be changed usi ng the rotary encoder o r the numeric keys. When the duty cycle is on, cha nging the period will cause a change in the width such t hat the duty cycle is kept constant. The duty cycle is set to OFF by changing the width val ue. The instrument will store the last value o f t he duty cycl e, and set the duty cycle to this value when it is next set to ON. The duty cycle has an absolu t e range of 1 % to 99 %, but the actual value is limited by the values of the period, delay and transition times.

F3: DELAY - This parameter is used in two instances. The first is to set the delay of the pulse in the

single pulse mode. The delay governs the time from the SYNC signal to the start of the pulse. The second instance is the double pulse mode. Here the delay governs the time from the SYNC pulse to t he beginning of the second pulse. The minimu m and maximum values of the delay are dependent on the values of the period, width and leading and trailing edge times. The delay range is 0 to 9.80000 s.

Delay Menu

F4: INDEP/CH1 - When channel 2 is selected using the CHAN button, this menu option will appear. By

default, it is selected in INDEP, which makes channel 2 a n independ ent channel. If CH1 is selected, channel 2 and channel 1 will have matching clock and trigger. The period and frequency will also be the same as channel 1. In this mode, all triggering options will not be available in the MODE menu, as it will be depende nt on chan nel 1 settings. Frequency and Period adjust options will also be disabled. Aside from these, all other parameters are still adjustable.

F5: SINGLE/DOUBLE - The unit can be set to generate either a SINGLE pulse or a DOUBLE pulse. In the

double pulse mode, the first pulse is generated without delay from the start and the second pulse in generated after a delay, from the start of the period, as determined by the DELAY parameter. Thus, in order to generate a double pulse, the delay must first be set, and then the double pulse may be set on. The double pulse mode state is to ggled using the F5 ke y. The minimu m and maxi mu m values of the d el ay ar e dependent on the values of the period, width, delay and transition parameters.

Page 22

Double Pulse

3.6.2 OUTPUT Menu

The Output menu enables the pulse high and lo w levels to be set. The levels are limited by four factors:

- The absolute limits are ±10 V.

- The high level must be greater than the low level.

- The pulse amplitude must be between 0.1 V and 10 V p-p, into 50 Ω.

- The levels cannot exceed the limits as set in the OUTPUT LIMITS menu.

Output Menu

F1: HILVL - Select s the pulse high level voltage. F2: LOLVL - Selects the pulse low level vo lta ge.

F3: PREDEF - Selects predefined pulse output levels. In addition to being able to set the levels to any

value within the limits, the user may also select one of four pre-defined levels:

CMOS: Low level ( LOLVL) = 0 V, High level (HILVL) = 5 V TTL: Low level (LO LVL) = 0.4 V, High level (HILVL) = 2.4 V ECL: Low level (LOLVL) = -1.8 V, High level (HILVL) = -0.8 V

USER: User-defined levels, entered by using the USER menu (F5: HIPRED and LOPRED) Press OUTPUT to exit USER menu.

Page 23

Predefined Output Menu

F5: OUTPUT LIMITS - Allows entering limits for the output levels to protect external devices co nnected to

the unit output.

Output Limits Menu

F1: LIM OF – Turns off limit level protection F2: LIM ON – T urns on limit level protection F3: HILIM – Sets hi gh limit for protection F4: LOLIM – Sets low limit for proection F5: PREV – Returns to p revious menu l evel

3.6.3 PULSE Menu

Pulse Menu

F1: RISE - Selects the pulse Rise time (Leading edge).

F2: FALL - Selects the pulse Fall time (Trailing edge).

F3: EQUAL - Selects equal Rise (Leading edge) and Fall (Trailing edge) times.

F5: NORMAL/COMPL - Selects Normal or Complement pulse mode.

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Complement Pulse Mode

The transition time range is 5 ns to 100 ms, but the value is limited to a 20:1 ratio between the transition times. In addition, both values must be within one of the following ranges:

5 ns – 100 ns 50 ns – 1 µs 500 ns – 10 µs 5 µs – 100 µs 50 µs – 1 ms 500 µs – 10 ms 5 ms – 100 ms

The transition times are also limited by the values of the period, width and delay.

Page 25

3.6.4 MODE Menu

Selects the output trigger mode: CONT (Continuous), TRIG (Triggered), GATE (Gated), BRST (Burst) and EXTWID (External pulse). To select the output mode, press MODE, then press the function key that corresponds to the desired Mode menu option, as shown:

Mode Menu

F1: CONT - (Continuous) - Selects continuous output.

F2: TRIG - (Triggered) – Triggers one output cycle of the selected pulse for each trigger event.

F3: GATE - (Gated) - Triggers output cycles as long as the trigger source asserts the gate signal.

F4: BRST - (Burst) - Triggers output N output cycles for each trigger event, where N ranges from 2 to 999,999.

F5: EXTWID - In the external width (EXT WID) pulse mode, the pulse period and width are determined by the

externally applied signal. The pulse generato r then applies transition and le vel parameters to this signal in order to generate the pulse. The period, width and delay may be changed, but their change has no effect on the pulse, and their values are not displayed. The trigger mode may not be changed while the external width pulse mode is enabled.

External Pulse

Page 26

After selecting the TRIG , GATE or BURST menu, the trigger source menu is available:

For TRIG and GATE mode:

F1: MAN - Selects manual as the trigger source. Pressing the MAN TRIG key generates the

trigger. In the Gate trigger mode, the pulse is generated as long as the key is being pressed.

F2: INT - Selects the internal trigger generator as the trigger source. Change the internal trigger rate displayed with the rota ry input knob or numerical keys. The rate has a range of 100 ns to

99.99 s, although the minimum value is limited by the value of the period in that the rate cannot be less than the period.

Trigger Menu

F3: EXT - Selects the external trigger signal as the trigger source. The trigger source is supplied through the TRIG IN connector.

F4: LEVEL/SLO PE - Two parameters are related to external trigger source operation. These are LEVEL and SLOPE. The Level determines at what voltage level the external signal will be recognized as a trigger. At level less than this, no pulse will be generated. The Slope determines whether the p ositive or negative edge of t he trigger sig nal will trigger the pulse. Use the rotary knob to toggle between the two selections.

For Burst Mode:

F1: MAN - Selects manual as the trigger source. Pressing the MAN TRIG key generates the trigger. In the Gate trigger mode, the pulse is generated as long as the key is being pressed.

F2: INT - Selects the internal trigger generator as the trigger source. Change the internal trigger rate displ ayed with the rotary input knob or numerical keys. The rate has a range of 100 ns to

Internal Trigger

Page 27

3.6.5 SETUPS Menu

The pulse generator can store the current front-panel settings and re c a ll them into one of 99 storage buffers. When you recall a setup, the pulse generator restores the front-panel settings to those that you stored in the selected buffer. Because it is impossible to 100% guarantee against loss of stored data, you should maintain a record of the data stored in memory so that you can manually restore such data, if necessary.

99.99 s, although the minimum value is limit ed by the value of the period in that the rate cannot be less than the period.

F3: EXT - Selects the external trigger signal as the trigger source. The trigger source is supplied through the TRIG IN connector.

F4: NBRST - Selects the number of burst cycles to burst. Set from 2 to 999,999 cycles.

F5: LEVEL/SLOP E - Two parameters are related to external trigger source operation. These are

LEVEL and SLOPE. The Level dete r mines at what voltage level the external signal will be recognized as a trigger. At level less than this, no pulse will be generated. The Slope determines whether the positive o r negative edge of the trigger signal will tr igger the pulse. Use the rotary knob to toggle between the two se l ections.

Setups Menu

F1: RECALL - Recalls a previously stored front-panel setup from the selected buffer. Change the

buffer number by using the rotary input knob. Valid storage buffer numbers are from 1 to 99.

Buffer 0 is the factory default setup; buffer 100 is the last front panel setup before power-off.

F2: STORE - Stores the c urrent front-panel setup to the specified storage buffer. Change the buffer

number by using the data keys or the rotary input knob. Valid storage buffer numbers range from 1 to 99.

F4: CLEAR ALL - Clears all data on all memory settings, after a YES or NO selection message.

Page 28

3.6.6 UTILITY Menu

Utility Menu

F1: GPIB -Selects the GPIB remote mode of operation. After selection the GPIB address can be set to any

value from 1 t o 31 using the rotary kno b. The value is kept in a nonvolatile memory and used at power-on. The factory default address is 10. Setting the address to 31 puts the device in the offbus state (it will not respond to messages on the GPI B bus).

GPIB Menu

F2: RS232 -Selects the RS232 remote control mode. After selection, the baud rate can be selected as 1200,

2400, 9600, 19200, 38400, 57600 or 115K. Always the RS-232 uses 8 bit data, 1 stop bit and no parity.

Note: If 115K baudrate speed is used, ensure that the RS232 cable is short and can support this

speed. Otherwise, there may be some instability and intermittent data transmission failure between the interfacing computer and the instrument .

F3: INTEN - Selects the intensity of the LCD display. Select a value using the r otary input knob. Valid

numeric values are from 1 to 31. The value is kept in the nonvolatile memory, after a 20 seconds

Page 29

time-out.

F4: POWER - (Power-on default) Selects the power-on default setting. Sele ct a value using the data keys or

the rotary input knob. The selectio n is effective after a 20s time-out period. Select zero (0) to have the pulse generator power on with the factory default settings. Select 99 to have the pulse generator power-on with the settings it had at the last power-off. Select any other value in the range from 1 to 98 to ha ve the pulse generator power-on with the s ett i ng s tha t you ha ve sa ved with SETUPS STO RE in the range 1 to 99.

Power-On Menu

NOTE: Power-on settings cannot resto re the status of output at power-on, meaning if the output is ON, power-on settings cannot recall it to be ON at start up. This setting will always remain OFF and power on, which is same as the default setup indicated above in Table 3-2. Although the output status can be stored into memory for recall using the store/recall functions, it cannot be recalled for a power-on setting start up. This is due to safety concerns as sensitive devices that are connected to the outputs of the generator may accidentally be damaged at power-on if the power-on configurations are not set p roperly (i.e. Amplitude level set too high for power-on may easily damage a sensitive device by accident).

3.7 ON Ke y

Use this key to control the main output signal. A build-in LED lights when the outp ut is active.

3.8 Cursor Movement Keys

Use these keys to move the cursor (when visible) either left or right. They are used in conjunction with the rotary input knob to set the step size of the rotary input knob.

3.9 Rotary Input Knob

Use this knob to increase and decrease numeric values or to scroll through a list. The cursor indicates the low-order position of t he displayed value which changes when you r otate the knob (for straight numeric entries only). For other types of data, the whole value changes when you rotate the knob.

3.10 Power-On Settings

Page 30

At powe r-on, the pul s e generator performs a diagnostic self-test procedure to check itself for errors. When the pulse

Key Functions

Values

Comments

WIDTH

200 ns

DELAY

0 ns

Pulse delay from Sync out

DPDELAY

5 us

Delay between pulses in double

HILVL

2.5 V

Pulse high level

LOLVL

-2.5 V

Pulse low level

MODE

CONT

Pulse mode

N-BURST

Waves per burst

SLOPE

POS

Positive external trigger slope

TLVL

1 V

External trigger level

TRIG SOURCE

MAN

Trigger so urce

INT TRG R ATE

1 ms

Internal trigger rate

OUPTUT

OFF

Output disabled

PULSE MODE

Normal

MODULATION

OFF

Modulation execution

RISE

5 ns

Pulse rise time

FALL

5 ns

Pulse fall time

generator finishes the diagnostic self-test routine, it enters the local state (LOGS) and assumes power-on default settings if the POWER-ON setting is at 0. You can program the pulse generator for any settings you want at power on, as described earlier in this section.

The factory default settings are:

Power-on Default Settings

PERIOD 500 ns Pulse Period

Pulse Width

pulse mode

NOTE: Power-on settings cannot resto re the status of output at power-on, meaning if the output is ON, power -o n set ti n gs cannot recall it to be ON at start up. T his setting will always remain OFF and p ower on, which is same as the default se tup indicated above in Table 3-2. Although t he output status can be stored into memory for recall using the store/recall functions, it cannot be recalled for a power-on setting start up. This is due to safety concerns as sensitive devices that are connected to the outputs of the generator may accidentally be damaged at power-on if the power-on configurations are not set properly (i.e. Amplitude level set too high for power-on may easily damage a sensitive device by accident).

3.11 Memory

The pulse generator uses a non-volatile FLASH memory for sto ring front panel settings. Up to 100 front panel settings can be stored.

3.12 Displaying Errors

At powe r-on, the waveform generator performs a diagnostic routine to check itself for problems. If the diagnostic routine finds an error, an error message is displayed. The waveform generator also displays error messages when front-panel settings are either invalid or may produce unexpected results.

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Normal single pulse output

Table 3-2

FAX 781.665.0780 - TestEquipmentDepot.com

Page 31

Error messages

Message Text Cause

Setting conflict Can't have this parameter set with other parameters. Trig rate short Internal trigger rate too short for pulse or burst. Empty location Attempt to restore a non existent setting. Calibration Error An error when performing unit calibration – for service personnel onl y. LCA load error Internal hardware error, must re-power the uni t Output overload An excessive loading of the output stage Verify unit calibration At power-on the unit checks for valid calibration data. Need to ca librate the unit. Incorrect entry A incorrect value entry or syntax error Width too high The width value is too high for the pulse period selected Set other level When the pulse amplitude is >10Vp-p, need to change the other pulse level

Save to Flash failed When s aving the instrument settings. Need to save agai n the setting.

Out of range Attempt to set a value out of instrument limits or in co nflict with other pulse

parameters.

3.13 Pulse Definitions

The figures illustrate the various pul se parameter definitions.

Pulse HIGH LEVEL corresponds to the most positive level of the pulse. Pulse LOW LEVEL corresponds to the most negative level of the pulse. Pulse AMPLITUDE is defined as the difference between the HIGH LEVEL and LOW LEVEL values.

Transition time (LEADING or TRAILING EDGE) is the interval required for the pulse to go from 10% to 90% of the selected amplitude or vice versa.

The way in which the instrument defines pulse parameters makes a distinction between the selected pulse, which assumes the fastest transition times and the actual pulse output. The values specified for WIDTH, PERIOD, and DELAY are defined with reference to the point at which the selected pulse reaches 50% of the amplitude during the leading and trailing edges at the fa stest tr ansition time.

WIDTH is the time interval between the 50% points of the leading and trailing edges. If the selected leading and trailing edge transition times are equal, the time interval between the 50% points is the same as that between the first and third corners.

PERIOD is the time bet ween the 50% points on the rising edges of two consecutive trigger out puts. DELAY i s the time between the 50% points on the rising edge of the TRIG OUTPUT pulse and the 50% point of the leading edge of the output pulse (at fastest transition time).

When VARIABLE TRANSITION TIMES are selected, the time interval between the 50% points of the actual pulse depends on both the WIDTH and TRANSITION TIME settings. A trailing edge slower or faster than the leading edge respectively lengthens or shortens the 50% interval. In effect, the pulse edges pivot about the first and third corners while the interval between thes e corners remains fixe d for a given width setting.

As long as the leading and trailing edge times are equal, the selected width and the actual width are the same.

Page 32

In the SINGLE or DOUBLE pulse mode t he instrument defines PERIOD as the time between the 50% points on the leading edges of two consecutive trigger outputs. DELAY, in double pulse mode, is the time between the leading edges of the first and second pulse using as a reference point 50% amplitude with fastest transition times.

SETTLING TIME is the interval required for the pulse level to enter and remain in the specified level ACCURACY RANGE, measured from the 90% AMPLITUDE point.

3.14 Pulse Parameter Limitations

The following formulas express the limits on Period, Width, and Dela y.

Single Pulse per Period Modes

(Un-delayed, Delayed, Counted Burst with single pulse mode)

[Period - (Width + Delay)] must be > 10 ns

0.99 * Period must be > (Width + Delay)

P u l s e max = 10.00 s P u l s e min = (Width + Delay + 10 ns), but not less than 20 ns Width max = [(Period * 0.99) - Delay – 10 ns], but not more than 9.89999 s Wi dt h min = 10 ns Delay max = [(Period * 0.99) - Width – 10 ns], but not more than 9.89998 s Dela y min = 0

Single Pulse Tra nsitio n Time Restrictions

Width must be > 1.3 * Leading Edge

(Period - Width) must be > 1.3 * Trailing Edge

Double Pulse per Period Modes

(Pa ired Pulse and Counted Burst with Paired pulses)

Dela y must be > Width

0.99 * Delay must be > (Width + 10 ns)

Pulse ma x = 10.00 s P u l s e min = (Width + Delay + 10 ns), but not less than 40 ns Width max = [(0.99 * Delay) – 10 ns], but not > 4.85000 s Width min = 10 ns Delay max = [(Period * 0.99) - Width –10 ns], but not > 9.80000 s

Page 33

Dela y min = (Width + 10 ns)

- - - - - - - - - - - - - - - - -

- - - - - -

TRIG OUTPUT

50%

HIGH LEVEL

LOW LEVEL

AMPLITUDE

50%

90%

10%

50%

90%

10%

WIDTH

1st Corner

LEADING

TRAILING

Double Pulse Transition Time Restrictions

Width must be > 1.3 * Leading Edge (Delay - Width) must be > 1 . 3 * Trailing Edge [Period - (Delay + Width)] must be > (1.3 * Trailing Edge)

Internal Trigger Burst Mode

(0.99 * Trig Rate) must be > (Period * Burst C ount)

3.15 Pulse Definitions

3rd Corner

EDGE

Pulse Definitions – High and Low Levels

Page 34

3rd Corner

VARIABLE TRANSITION

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

50%

1st Corner

3rd Corner

FASTEST TRANSITIO N 50%

50%

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

VARIABLE TRANSITION

- - - - - - - - - - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

TRIG OUTPUT

50%

1st Corner

3rd Corner

DELAY

WIDTH

PERIOD

ACTUAL DELAY

FASTEST TRANSITIO N

TIMES SELECTED

Pulse Definitions – Width, Period, and Delay

TRIG OUTPUT

PERIOD

WIDTH

TIMES SELECTED

WIDTH

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

TIMES SELECTED

Pulse Definitions – Period and delay – Double Pulse Mode

Page 35

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

10% AMPLITUDE

ACCURACY

RANGE

90% AMPLITUDE

SETTLING TIME

4.1 Overview

4.1.1 GPIB

This section provides detailed information on programming the pulse generator via the IEEE 488 bus (GPIB -

General Purpose Interface Bus). The pulse generat or is programmable over the IEEE 488 bus, and its message

protocol is compatible with IEEE 488.2. The device command set is compatible with the SCPI 1992.0 standard.

The SCPI standard does not cover all the needs of the pulse generator, and so the standard has been added where

necessary.

The command syntax as defined by the IEEE 488.2 and SCPI standards is briefly explained in the following

sections. Users who have experience programming GPIB instruments may skip these paragraphs, and go directly

to where the individual command syntax is given. Users wishing to gain further insight should consult the

standards.

Pulse Definitions – Settling Time

Section 4

Programming

4.1.2 RS-232-C

The INSTALLATION section of this manual describ es the RS-232-C connection for the instrument. Be sure that

Page 36

you have the Remote Mode set to RS-232 and correctly set the baud rate.

EIA standard RS-232-C specifies the electrical characteristics and pin out of a serial communication standard for

connecting "data terminal equipment" (DTE) to "data communication equipment" (DCE). Data terminal equipment

is usually devices such as terminals, computers, or prin ters that are the final destination for data. Data

communication equipment, on the other hand, is usually a modem or other device that converts the data to another

form and passes it through. The instrument can be configured only as a DCE, so in most cases it can be connected

with a straight-through cable to a computer, but would require special cabling to connect to another DCE device.

The baud rate is the bit rate during the transmission of a word in bits per second. Different devices use many baud

rates, but the baud rates of the two devices that are conn ected must be th e same. The instrument can be set to

different baud rates ranging from 1200 to 115,000 as described in Section 3, Operating Instructions.

Data signals over the RS-232-C use a voltage of +3V to +25V to represent a zero (called a space) and a voltage of -

3V to -25V to represent a one (called a mark). Handshake and control lines use +3V to +25V to indicate a true

condition and -3V to -25V to indicate a false condition.

When no data is being transmitted, the idle state of the data lines will be the mark state. To transmit a byte, the

transmitting device first sends a start bit to synchronize the receiver.

The RS-232-C standard is not ve ry specific about many of the handshaking si gnals and it i s therefore usually

necessary to refer to the manuals for both of the devices being connected to determine the exact pin out, signal

definition, and signal direction for the devices.

The serial interface implements the same SCPI command set as the GPIB interface. The instrument is

programmed by sending ASCII coded characters to the instrument.

When the instrument is in the remote mode, remote command input has priority over any front panel control.

Therefore, as long as the serial interface is continuously supplied with data, the keyboard will appear to be

inoperative to the user.

Note: In remote mode, any command sent or received via RS232 will change the display screen w ith the

following:

User can return to local control with the press of any front panel ke y s, but it is extremely important to note tha t

this should be done

PC. Any interruptions durin g transfer may delay the communication process or cause comm un i cation errors.

The instrument accepts a line feed (LF) as an end of string (EOS) terminator.

4.2 Device State

The device may be in one of the four possible states described below. The transition between states is defined by

IEEE 488.1.

ONLY

when nothing is being sent or transferred between the instrument and the connected

Page 37

4.2.1 Local State (LOCS)

In the LOCS the device may be operated from the front panel only. Its settings may be queried over the GPIB, but

not changed. Commands that do not affect the signal being output by the instrument are accepted.

4.2.2 Local With Lockout State (LWLS)

In the LWLS the device may be operated from the front panel only. Its settings may be queried over the GPIB, but

not changed. Commands that do not affect the signal being output by the instrument are accepted. The difference

between the LOCS and the LWLS is that from the LWLS the device may enter the Remote With Lockout State.

4.2.3 Remote State (REMS)

In the REMS the device may be operated from the GPIB. Actuating any front panel key will cause the device state

to revert to the LOCS.

4.2.4 Remote With Lockout State (RWLS)

In the RWLS the device is operable only from the GPIB. Front panel operation may be returned by either sending

an appropriate IEEE 488.1 command, or by cycling the device power.

4.3 Interface Functi on S ubs e t s

The following interface function subsets are implemented in the pulse generator:

SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, E2, C0

4.4 Device Address

The GPIB address of the device may be set to any value from 0 to 31. The address may be changed from the front

panel, using the numeric keypad or the rotary encoder, or via the GPIB itself using the command:

:SYSTem:COMMunicate:GPIB:ADDRess

Setting the device to address 31 puts it in the 'off-bus' state. In this state it will no t r e spond to messages on the

GPIB. If the device is in the REMS when set to address 31, an internal 'return-to-local' command will be g iven,

setting the device to the LOCS. If the device is in the RWLS, the 'return-to-local' command is ignored, and the

device remains in the RWLS. The only way to then re-establish communication with the device over the GPIB is

to cycle the power, and to then change the address to that required from the front panel.

4.5 Message Exchange Protocol

The device decodes messages using the Message Exchange Protocol (MEP) de fi ned in IEEE 488.2. The following

functions implemented in the MEP must be considered:

Page 38

4.5.1 The Input Buffer

The device has a 128-byte long cyclic input buffer. Decoding of remote messages begins as soon as the input

buffer is no t empty, that is, as soon as the controller has sent at least one byte to the device. Should the i nput

buffer be filled up by the controlle r faster than the device can remove the bytes and decode them, the bus

handshake is not completed until room has been made for more bytes in the buffer. This prevents a fast controller

from overrunning the d evice with d ata.

If the user has sent part of a Program Message, but not the Program Message Terminator, and wishes to abort the

message decoding and execution, the Device Clear command may be sent, or front panel operation resumed (in

REMS only).

4.5.2 The Output Queue

The device has a 100-byte long output queue in which it stores response messages for the controller to read. If at

the time a response message is formatted the queue contains previously formatted response messages, such that

there are not enough places in the queue for the new messag e, the device will put off putting the message in the

queue until there is place for it.

The Status Byte MAV bit, when set, indicates that part or all of a response message is ready to be read.

4.5.3 Response Messages

The device sends a Response Message in response to a valid query. All queries return a single Response Message

Unit, and all query responses are generated at the time the query is parsed.

4.5.4 Coupled Commands

Coupled Commands are either commands whose execution validity depends on the value of other parameters, or

commands whose execution changes the value of another parameter. The execution of commands designated as

being coupled is deferred until all other commands in the same Program Message have been executed. The

coupled commands are then grouped together according to their functionality, and executed as a group. All

parameters of the pulse generato r are coupled.

4.6 Instrument Identification

The *IDN? common query is used to read the instrument's identificatio n s tring. The string returned is something similar to the following:

B&K, MODEL 4034,0,V0.40

4.7 Instrument Reset

The *RST common command effects an instrument reset to the factory default power up state.

4.8 Self Test

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The *TST common query causes the device to perform a self test. This self test consists of checking the functionality of the pulse generato r.

4.9 Command Syntax

4.9.1 Gene r al Command Structure

The device commands are generally defined by the SCPI standard, with the exception of those instrument functions for which SCPI commands do not as yet exist.

The Common C ommands and Queries are defined by IEEE 488.2. The command syntax, i.e. how a command is structured, is defined by IEEE 488.2.

4.9.2 The Progr am Message

A Program Message is defined as a string containing one or more Program Message Units, each of which is an instrument command or query. Program Message Units are separated from each other by the Program Message Unit Separator. The Program Message is terminated by the Program Message Terminator.

The Program Message Unit Separator consists of a semicolon (';'), optionally preceded and/or followed by white-space characters. A white-space character is defined as the ASCII characters in the ranges 00H-09H, and 0BH-20H. This range includes the ASCII control characters and the space, but excludes the Linefeed character.

The Program Message Terminator consists of optional white-space characters, followed by one of three options:

- Linefeed (LF) character (ASCII 0A);

- GPIB EOI bus line being set true on the last byte of the message;

- LF being sent with EOI true.

The Program Message Unit can be divided into three sections as follows.

4.9.2.1 Program Message Header

The Program Header represents the operation to be performed, and consists of ASCII character mnemonics. Two types of Program Headers are used in the pulse generator : Instrument-control headers and Common C ommand and Query head ers. A Progr am Header may consist of more than one mnemonic, in which case the mnemonics are separated from each other by the colon (':'). For instrument control commands, the mnemonics are specified by the SCPI standard, and indicate the tree structure of the command set. The first mnemonic indicates the subsystem being controlled. Common Command and Query Program Head ers consist of a single mnemonic prefixed by an asterisk ('*').

The mnemonics consist of upper- or l ower-case alpha characters. Mnemonics may be written in either the long form, in which the entire mnemonic is written out, or the short form, in which only a specified portion o f t he mnemonic is written out . Some mnemonics have only one form due to their short l ength. Where a command is described, the portion appearing in upper case i s the short form. Only the short form or the long form may be used.

Example: The command to set the per iod to 1 microsecond may be written in the following ways: SOURCE:PULSE:PERIOD 1US

SOUR:PULS:PER 1US

SOURCE:PULSE:PERIOD 1US Some mnemonics in a specified Program Header may be optional. This is indicated in the command

description by the mnemonic being enclosed in square brackets ([...]). This means it is not necessary to write the mnemonic into the Program Header : it is a default condition.

The 'SOURCE' mnemonic, for e xample, is optional. Not specifying it wi ll c a use the device to search for the mnemonics in the Program Header under the Source Subsystem. F or example, the per iod may be set by the command:

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:PULS:PER 1US

4.9.2.2 Program Message Header Separator

The Program Header Separator is used to separate the program header from the program data. It consists of one or more white-space characters, denoted as <ws>. Typically, it is a space.

4.9.2.3 Program Message Data

The Pro g ram Data represent the values of the parameters being set, for example, the '1US' in the above examples. Different forms of program data are accepted, depending on the command. The Program Data types used in the pulse generator are as follows:

1. Character program data – This form of data is comprised of a mnemonic made up of lower - or upper-case alpha characters. As with Program Header mnemonics, some Character Data mnemonics have short and long forms. Only the short or the long form may be used.

2. Boolean data – Boolean data indicate that the parameter can take one of two states, ON or OFF. The parameter may be character type ON or OFF or numeric. A numeric value is rounded to an integer. A non-zero result is interpreted as 1 (ON), and a zero result as 0 (OFF). Queries return the values 0 or 1.

3. NRf – This is a decimal numeric data type, where

NR1 indicates an integer number,

NR2 indicates a fixed-point real number, and NR3 indicates a floating-point real number.

All parameters that have associated units accept a suffix, which may be specified using upper -

or lower-case characters. When the suffix is not specified, the numeric value is accepted in the default units, which are Hertz for frequency, Seconds for time, a nd V olts for voltage. To set the period to 1 microsecond we can send one of the following commands:

:PULS:PER 1E-6 or :PULS:PER 1000NS The special forms of character data accepted as numbers as defined by SCPI are NOT accepted

by the pulse generator.

There are two types of Program Message Units: Command Message Units and Query Message

Units. A Query differs from a Command in that the Program Header is terminated with a question mark ('?'). For example, the period might be queried with the following query:

:PULS:PER? Not all Program Message units have query for ms, such as STATUS:PRESET, and so me

Program Message Units might have only the query form, such as SYSTEM:VERSION?. The pulse generator puts the response to the query into the output queue, from where it may be read by the controller. The Status Byte MAV bit is set to indicate to the controller that a resp onse is ready to be read.

4.9.3 SCPI Comm and Structure

SCPI commands are based on a hierarchical structure. This allows the same instrument-control header to be used several times for different purposes, provid ing that the mnemonic occurs in a unique

position in the hierarchy. Each level in the hierarchy is defined as a node. Mnemonics in the different levels are separated from each other by a colon (':'). The first Program Message Unit, or command , in a Program Message is always referenced to the root node. Subsequent commands are referenced to the same level as the previous command.

A Program Message Unit having a colon as its first character causes the reference to return to the root. This process is defined by IEEE 488, section A.1.1. Consider the following examples:

1. The following command may be used to set the high and low levels of the pulse. Note that the LOW command is referenced to the command preceding it. The LOW mnemonic resides at the same node as the HIGH command.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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SOURCE:VOLTAGE:HIGH 5V;LOW 2V

2. This command sets the frequency and the high level. The FREQUENCY and VOLTAGE mnemonics are at the same level.

SOURCE:FREQUENCY 2KHZ;VOLTAGE:HIGH 4V

3. When Program Message Units describe different subsystems, a colon prefix must be used to reset the command reference to the root. Here the frequency and the output state are set.

SOURCE:FREQUENCY 3KHZ;:OUTPUT:STATE ON Common Commands may be inserted in the Program Message wit hout affecting the instrument-

control command reference. For example,

SOURCE:VOLTAGE:HIGH 4V;*ESE 255;LOW 2V

4.10 Status Reporting

The instrument is capable of reporting status events and errors to the controller, using the IEEE 488.1 Service Request function and the IEEE 488.2 S tatus Report ing struct ure.

4.10.1 The Status Byte

Status summary information is communicated from the device to the c ontroller using the Status Byte (STB). The STB is composed of single-bit summary-messages, each summary message summarizing an overlying Status Da ta Structure. By examining the content of the S TB, the controller ga ins some information concerning the instrument's status. The STB bits are defined as follows:

Bit 0: Unused Bit 1: Unused Bit 2: Error/event queue summary message (EVQ). This bit is set if t he queue is not empty. Bit 3: Questionable Status summary message. This bit is not used by the pulse generator. Bit 4: Message Available (MAV) summary message. This bit is set whenever all or part of a

message is available for the controller to read. The controller may be ready to read the response message before it is available, in which case it can either wait until this bit is set, or it can start to read. In the second case, the controller time-out must be set so that the read action will not be aborted before the message has been read.

Bit 5: Event Status Bit (ESB) summary message. This bit is set to indic a te that one or more of

the enabled standard events have occurred. Bit 6: Request Service (RQS). This bit is set when the device is actively requesting service. Bit 7: Operation Status summary message. No Operation Status events are defined in the pulse

generator, and so this bit is never set.

The STB is read by the controller during a serial poll. If the RQS bit was set, it is then cleared. The STB may also be read by the *STB? common query.

4.10.2 Service Request Enabling

Service request enabling allows the user to select which Status Byte summary messages may cause the device to actively request service. This is achieved using the Service Request Enable Register, which is an 8-bit register whose b its correspond to those of the STB. The RQS bit in the STB is set when a bit in the STB is set, and its correspo nding bit in the service request enable register is set.

The service request enable register is set using the *SRE common command, and read using the *SRE? common query.

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4.10.3 Standard Event Status Register

The Standard Event Status Register (SE SR) is defined by IEEE 488.2. It is implemented in the pulse generator as a byte, whose bits have the following definitions:

Bit 0: Operation Complete (OPC). This bit is set in response to the *OPC common command

being executed. Bit 1: Request Control (RQC). Not implemented in the PG. Bit 2: Query Error (QYE). This bit is set when either the co ntroller is attempting to read data

from the device when none is available, or when data prepared for the controller to read

has been lost. Bit 3: Device-Specific Error (DDE). This bit is set to indicate that a device operation did not

execute due to some device condition. Bit 4: Execution Error (EXE). This bit is set when the device could not execute a command,

due to the command being outside of its capabilities. For example, a parameter being out

of range. Bit 5: Command Error (CME). This bit is set to indicate an error in the command syntax. Bit 6: User Request (URQ). This bit is not used by the pulse generator. Bit 7: Power On (PON). This bit is set when the device is powered on.

The SESR is q ueried using the *ESR? common que ry. The SESR is paired with an enable register, the Standard Event Status Enable Register (SESER). This

register enables one or more events in the SESR to be reflected in the Status Byte ESB summary message bit. The bits of the SESER correspond to those of the SESR. Setting a b it in the SESER enables the corresponding event to set the ES B bit when i t occurs. T he SESER is set with the *ESE common command and q ueried with the *ESE? command query.

4.10.4 The Error Queue

The error queue is used to store codes of errors detected in the device. It is implemented as a cyclic buffer of length 10. W hen the error queue is not empty, bit EVQ in the Sta tus Byte is set. The er ror queue is read with either one of the following two queries:

:SYSTEM:ERROR? :STATUS:QUEUE:NEXT?

The first er ror in the queue is returned, and t he queue is advanced.

4.10.5 Error Codes

The negative error codes are defined by SCPI. Positive codes are specific to the PG. The error message is returned in the following form:

<error number>,"<error description>"

A table of error numbers and their descriptions is presented here. No error reported 0 No error

4.10.5.1 Command Errors

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A command error is in the range -199 to -100, and indicates that a syntax error was detected. This includes the case of an unrecognized header. The occurrence of a command error causes the CME bit (bit 5) of the Standard Event Status Register to be set.

Code Description

-100 Command Error

-101 Invalid character

-102 Syntax error

-103 Invalid separator

-104 Data type error

-105 GET not a llowed

-108 Parameter not allowed – More parameters than allowed were received

-109 Missing parameter – Fewer parameters than necessary were received

-110 Command header error

-111 Header separator error

-112 Program mnemonic too long – The mnemonic must contain no less than 12 characters

-113 Undefined header

-114 Header suffix out of range

-120 Numeric data error

-121 Invalid character in number

-123 Exponent too large – IEEE 488.2 specifies maximum of 32000

-124 Too many digits – IEEE 488.2 specifies maximum of 255 digits in mantissa.

-128 Numeric data not allowed – A different data type was expected

-131 Invalid suf fix

-134 Suffix too long – A maximum of 12 characters are allowed in a suffix

-138 Suffi x not allowed

-140 Character data error

-141 Invalid character data – Incorrect character data were received

-144 Character data too long – Character data may contain no more than 12 characters

-148 Character data not allowed

-158 String data not allowed

-168 Block data not allowed

-178 Expression data not a llowed

4.10.5.2 Execution Errors

An execution error indicates that the device could not execute a syntactically correct command, either since the data were out of the instrument's range, or due to a device condition. The EXE bit (bit 4) of the Standard Event Status Register is set on occurrence of an execution error.

Code Description

-200 Execution error

-201 Invalid while i n lo c a l – An attempt was made to change an instrument setting while the

instrument was in the LOCAL state

-211 Trigger ignored – The GET or *TRG common command was ignored due to the device

not being in the correct state to execute the trigger

-221 Settings conflic t – The parameter is out of range due to the current instrument state

-222 Data out of range – The parameter exceeds the absolute limits

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4.10.5.3 Device-Specific Errors

An error specific to the device occurred. The DDE bit (bit 3) of the Standard Event Status Register is set.

Code Description

-315 Configuration memory lost – Device memory has been lost. Check the back-up battery

-330 Self-test failed

-350 Que ue overflow – Error codes have been lost due to more than 10 errors being reported

without being read

4.10.5.4 Query Errors

A query error indicates that the o utp ut queue control has detected a problem. This could occur if either an attempt was made to read data from the instrument if none was available, or when data were lost. Data could be lost when a query causes data to be formatted for the controller to be read, and the controller sends more commands without reading the data.

Code Description

-410 Query INTERRUPTED – Data were sent before the entire response of a previous query

was read

-420 Query UNTERMINATED – An attempt was made to read a response before the

complete program message meant to generate that response was sent

-430 Query DEADLOCKED – The input buffer and outp ut queue are full, and the controller

is attempting to send more data. In this case the output queue and input buffers will be cleared. Parsing will resume after the END message is detected

-440 Query UNTERMINATED after indefinite response – A query was received in the same

program message after a query requiring an indefinite response was formatted. Essentially this means that the *IDN? common query and the :ARB:DATA? query should not be followed by more query messages in the same program message

4.10.5.5 System Events

System events have positive valued codes. They are not defined by SCPI, but are specific to the PG.

Code Description

401 Power on 402 Operation complete – The *OPC command as been executed

Warnings

The execution of some commands might cause an undesirable instrument state. The commands are executed, but a warni ng is issued. S ending the :S TATus:PRESet comma nd disables reporting of warnings. The existence of these conditions causes a bit in the Status Questionable Condition register to be set (refer to section 4.13.5.4).

For Model 4033

500 Trigger rate short

510 Output overload

For Model 4034

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500 Trigger rate short on channel 1 501 Trigger rate short on channel 2 510 Output overload on channel 1 511 Output overload on channel 2

"Trigger rate short" means that the period of the waveform is larger than the value of the internal trigger rate. Thus not eve ry trigger will generate a cycle (or burst) of t he waveform.

4.11 IEEE 488.2 Common Commands a nd Q ue ries

4.11.1 System Data Commands

The identification query command, *IDN?, enables unique identification of the device over the GPIB. It returns a string with four fields:

Manufacturer name Model name Serial number (0 if not relevant) Version number

5.11.2 Internal Operation Commands

4.11.2.1 *RST - Reset Command

The Reset command resets the device and returns it to the factory default power-up state.

Command Type: Common Comma nd Syntax: *RST

4.11.2.2 *TST? - Self-Test Query

The self-test query causes an internal self-test to be performed. This test consists of checking t he status of the period, pulse and output cards.

Command Type Common Query Syntax *TST? Response ASCII 0 if test passes

ASCII 1 if test fails

5.11.3 Synchronization Commands

4.11.3.1 *OPC - Operation Complete Command

The operation complete command causes the device to generate the operation complete message in the Standard E vent Status Register, on completion of the selected device operation.

Command Type: Common Comma nd Syntax: *OPC Examples: PULS:PER 1US;*OPC

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The *OPC command (and the *OPC? query described below) find use ma i nly when commands having relatively long execut ion times are executed, although all commands execute without any appreciable delay.

4.11.3.2 *OPC? - Operation Complete Query

The operation complete query places an ASCII character 1 in the output queue on completion of the selected device operation.

Command Type: Common Query Syntax: *OPC? Response: ASCII character 1 Example: PULS:PER 1US;*OPC?

4.11.3.3 *WAI - Wait-to-Continue Command

This command is intended for use with overlapped commands. No commands in the pulse generator are overlapped, and so this command has no effect.

Command Type: Common Comma nd Syntax *WAI

5.11.4 Status and Event Commands

4.11.4.1 *CLS - Clear Status

The clear status command clears the SESR and Error Queue status data structures. COMMAND TYPE: Common Co mma nd

Syntax:: *CLS

4.11.4.2 *ESE - Standard Event Status Enable

This command is used to set the value of the Standard Event Status Enable Register. COMMAND TYPE: Common Command or Query COMMON COMMAND

Syntax: *ESE<ws><NRf> Arguments:

Type: NRf Range: 0 to 255. Non integer arguments are rounded before execution.

Examples: *ESE 48 (Enables the CME and EXE bits)

*ESE 255 (Enables all standard events)

QUERY

Syntax: *ESE? Response: <NR1>

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4.11.4.3 *ESR? - Standard Event Status Register Query

This query is used to read the value of the Standard Event Status Register. Reading the register clears it.

COMMAND TYPE: Common Command or Query

Syntax: *ESR? Response: <NR1>

4.11.4.4 *PSC - Power-On Status Clear Command

This command is used to control the automatic power-on clearing of certain status functions. COMMAND TYPE: Common Command or Query COMMON COMMAND

Syntax : *PSC<ws><Boolean> Arguments:

Type: Boolean

Examples: *PSC ON or *PSC 1

*PSC OFF or *PSC 0

QUERY

Syntax: *PSC? Response: ASCII 0 for OFF

ASCII 1 for ON

When set to ON (1), the Service Request Enable Register and the Standard Event Status Enable Register are cleared on power-on.

4.11.4.5 *SRE - Service Request Enable Command

This command sets the Service Request Enable Register bits. COMMAND TYPE: Common Command or Query COMMON COMMAND

Syntax: *SRE<ws><NRf> Arguments:

Type: NRf Range: 0 to 255. Non integer arguments are rounded before execution. The value of bit 6 is ignored, and is set always to zero.

Examples: *SRE 48 (Enables reporti ng of ESB and MAV events)

QUERY

Syntax: *SRE? Response: <NR1>

f) STB? - Status byte query This query is used to read the value of the Status Byte. COMMAND TYPE: Common Query

Syntax : *STB? Response: <NR1>

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The value of the Status Byte read with the *STB? query may differ from that read with the Serial Poll. Bit 6 of the STB will be set as long as a reaso n for requesting service exists, while bit 6 of the STB as read by the Serial Poll is cleared by the Serial Poll.

4.11.5 Device Trigger Commands

*TRG - Trigger command This command is analogous to the IEEE 488.1 Group Execute Trigger interface message, and has the

same effect. It is used to trigger the device to output a wave, and is accepted only when the trigger mode is set to Trigger, Gate or Burst, and the trigger source is set to BUS.

Command Type: Common Comman d Syntax: *TRG

5.11.5 Stored Settings Commands

4.11.6.1 *RCL - Recall Instrument State

This command is used to restore the state of the device to that stored in the specified memory location. COMMAND TYPE: Common Co mma nd

Syntax: *RCL<ws><NRf> Arguments:

Type: <NRf> Range: 0 to 99. Non integer value s are rounded before execution

Example: *RCL 0 (Recall default state)

*RCL 99

4.11.6.2 *SAV - Save Instrument State

This command is used to store the current instrument state in the specified memory location. COMMAND TYPE: Common Co mma nd

Syntax: *SAV<ws><NRf> Arguments:

Type: <NRf> Range: 1 to 98. Non integer value s are rounded before execution

Example: *SAV 25

Stored setting location 0 stores the factory defaults, and is a read-only location. Location 99 stores a copy of the current instrument settin g, a nd it, too, is read-only.

4.12 Instrument Control Com m a nds

Instrument control commands are grouped into logical subsystems according to the SCPI i ns trument model. The commands are comprised of mnemonics indicating the subsyste m t o which the command belongs, a nd the hierarchy within that subsystem. Whe n the command is to be referred to the Root node, it should be prefixed with a colon (:). Mnemonics appearing in square brackets [...] are optional. The '|' character is used to denote a choice of specifications. The '<ws>' is used to denote a white space character.

Page 49

4.12.1 SOURce Subsy st em

The Source Subsystem c ontrols the frequency, voltage and pulse characteristics. The command structure is as follows:

:SOURce :FREQuency [:CW|FIXed] <NRf> :VOLTage [:LEVel]

[:IMMediate] HIGH <NRf> LOW <NRf> PREDefined TTL|CMOS|ECL|USER PHIGh <NRf> PLOW <NRf>

:LIMit HIGH <NRf> LOW <NRf> :PULSe :PERiod <NRf> :WIDTh <NRf> :DELay <NRf> :DCYCle <NRf> :HOLD WIDTh|DCYCle :EWIDth <Boolean> :DOUBle [:STATe] <Boolean> :DELay <N Rf> :TRANsition [:LEADing] <NRf> :TRAiling <NRf> :AUTO <Boolean>|ONCE

:POLarity NORMal|COMPlement|INVerted

:COUP

MODEL 4034 ONLY:

To control channel 2, change the subsystem from :SOUR to :SOUR2. For example, to check pulse period of channel 2, send the command :SOUR2 :PULS:PER?

4.12.1.1 Frequency

The frequency command controls t he frequency of the pulse in the continuous trigger mode. It is the inverse of the period.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:FREQuency[:CW|FIXed]<ws><frequency>[units] Arguments:

Type: NRf Units: MHz, kHz, Hz (default)

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Range: 0.1Hz to 50MHz Rounding: To the resolution of the ra nge. Examples: :FREQ 5KHZ :FREQ 5E3

QUERY

Syntax: [:SOURce]:FREQuency[:CW|:FIXed]? Examples: :FREQ? Response: NR3

CONSIDERATIONS: FIXed is an alias for CW.

4.12.1.2 High Voltage Level

This command is used to s et the high l evel of the pulse. COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:HIGH<ws><high level>[units] Arguments:

Type: NRf Units: MV, V (default) Range: -9.5V to +10V Rounding: To 10mV Examples: VOLT:HIGH 4V

QUERY

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:HIGH? Examples: :VOLT:HIGH?

Response: NRf

CONSIDERATIONS:

1) The high level must be greater than the low level.

2) The difference between the levels must conform to 0.5V ≤ difference ≤ 10V

3) The high level may not exceed the high limit.

4.12.1.3 Low Voltage Level

This command is used to set the low level of the pulse. COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:LOW<ws><low level>[units] Arguments:

Type: NRf Units: MV, V (default) Range: -10V to +9.5V Rounding: To 10mV Examples: :VOLT:LOW 4V

QUERY

Syntax: [:SOURce]:VOLTage:[:LEVel][:IMMediate]:LOW?

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Page 51

Examples: :VOLT:LOW? Response: NRf

CONSIDERATIONS:

1) The high level must be greater than the low level.

2) The difference between the levels must conform to 0.5V ≤ difference ≤ 10V

3) The low level may not be less than the low limit.

4.12.1.4 Predefined High Voltage Level

This command is used to s et the predefined hig h level of the pulse. The pulse will be set when the predefined USER levels are invoked to this high level.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:PHIGH<ws>

<predef high level>[units]

Arguments:

Type: NRf Units: MV, V (default) Range: -9.5V to +10V Rounding: To 10mV Example: :VOLT:PHIGH 4V

QUERY

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:PHIGH? Example: :VOLT:PHIGH? Response: NRf

4.12.1.5 Predefined Low Voltage Level

This command is used to set the predefined low level of the pulse. The pulse will be set when the predefined USER levels are invoked to this low level.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:PLOW<ws>

<predef low level>[units]

Arguments:

Type: NRf Units: MV, V (default) Range: -10V to +9.5V Rounding: To 10mV

Examples: :VOLT:PLOW 4V

QUERY

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:PLOW? Examples: :VOLT:PLOW? Response: NRf

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4.12.1.6 Predefined Voltage Levels

This command is used to set the pulse voltage levels to predefined values. Four predefined values are available as follows:

CMOS: High level 5V; Low level 0V TTL: High level 2.4V; Low level 0.4V ECL: High level –0.8V; Low level –1.8V USER: User-defined levels, as set using the PHIGH and PLOW commands

COMMAND TYPE: Setting only SETTING

Syntax: [:SOURce]:VOLTage[:LEVel][:IMMediate]:PREDefined<ws><option> Arguments:

Type: Character Options: CMOS, TTL, ECL, USER

Examples: :VOLT:PRED ECL

4.12.1.7 High Voltage Limit

This command is used to s et the high l imit of the pulse. COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:VOLTage:LIMit:H I G H <ws><high limit>[units] Arguments:

Type: NRf Units: MV, V (default) Range: -9.5V to +10V Rounding: To 10mV

Examples: :VOLT:LIM:HIGH 4V

QUERY

Syntax: [:SOURce]:VOLTage:LIMit:HIGH? Examples: :VOLT:LIM:HIGH? Response: NRf

CONSIDERATIONS: The high limit cannot be set to less tha n the high level.

4.12.1.8 Low Voltage Limit

This command is used to set the low limit of the pulse. COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:VOLTage:LIMit:LOW <ws><low limit>[units] Arguments:

Type: NRf Units: MV, V (default) Range: –10V to +9.5V Rounding: To 10mV Examples: VOLT:LIM:LOW 4V

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QUERY

Syntax: [:SOURce]:VOLTage:LIMit:LOW? Examples: :VOLT:LIM:LOW?

Response: NRf

CONSIDERATIONS: The low limit cannot be set greater than the low level.

4.12.1.9 Pulse Period

This command is used to set or query the period of the pulse. COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:PERiod<ws><period>[units] Arguments:

Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 20NS to 10S Rounding: To current resolution Examples: :PULS:PER 1U S :PULS:PER 400E-6

QUERY

Syntax: [:SOURce]:PULSe:PERiod? Examples: :PULS:PER?

Response: NRf

CONSIDERATIONS: The allowed range of the period will be determined by the values of the width, delay, and

transition times.

4.12.1.10 Pulse Width

This command is used to s et or query t he value of the pulse wid th. If the d uty cycle is O N when the width command is sent, it is then set to OFF, and changes in the period will no longer affect the widt h.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:WIDTh<ws><width>[units] Arguments:

Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 10NS to 9.89999S Rounding: To current resolution Examples: :PULS:WIDT 25 NS :PULS:WIDT 200E-9

QUERY

Syntax: [:SOURce]:PULSe:WIDTh?

Page 54

Examples: :PULS:WIDT? Response: NRf

CONSIDERATIONS: The allowed range of the width will be determined by the values of the period, delay, and

transition times.

4.12.1.11 Pulse Delay

This command is used to set the delay from the trigger signal to the start of the pulse in single pulse mode. Although there exists a separate command for the double pulse delay, both commands affect the same delay, and so this command will also determine the time between the two pulses in the double pulse mode.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:DELay<ws><delay>[units] Arguments:

Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 0NS to 9.80000S Rounding: To current resolution Examples: :PULS:DELay 25NS :PULS:DEL 200E-9

QUERY

Syntax: [:SOURce]:PULSe:DELay? Examples: :PULS:DEL?

Response: NRf

CONSIDERATIONS: The allowed range of the delay will be determined by the values of the period, width, and

transition times.

4.12.1.12 Pulse Duty Cycle

This command is used to set the duty cycle of the pulse. Once the duty cycle has been set it is considered to be ON, and then changes in the period will automatically cause changes in the width, such that the duty cycle is kept consta nt. The duty cycle is set OFF by either setting the pulse width, or by the PULSE:HOLD WID TH command. Querying the duty cycle when it is off will re t urn the value zero (0).

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:DCYCle<ws><duty>[units] Arguments:

Type: NRf Units: None Range: 1% to 99% Rounding: To 0.1% Examples: :PULS:DCYC 25

QUERY

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Syntax: [:SOURce]:PULSe:DCYCle? Examples: :PULS:DCYC?

4.12.1.13 Pulse Hold

This command is used to determine whether the width or the duty cycle are to be held constant when the period is changed. The duty cycle is termed to be ON when changes in the period cause changes in the width, such that the duty cycle remains constant. This state is achieved by specifying the DCYCle parameter in the HOLD command. The duty cycle is set OFF by specifying the WIDTH parameter, and then changes in the per iod will not affect the width. When setting the duty cycle O FF, the las t value is remembered, which is the value the duty cycle takes when it is next set ON.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:HOLD<ws><option> Arguments:

Type: Character Options: WIDTh, DCYCle Examples: :PULS:HOLD WIDTh :PULS:HOLD DCYC

QUERY

Syntax: [:SOURce]:PULSe:HOLD? Examples: :PULS:HOLD?

Response: WIDT | DCYC

4.12.1.14 External Width

This command is used to enable or disable the external width function. Whe n enab le d (ON), this function causes an externally applied pulse to be generated with the same width, but with transition times and output levels as specified by the instrument. When the external width is enabled, the pulse parameter period, width, delay and duty cycle may not be specified. Doing so will cause error 221 to be returned. Also, the double pulse mode may not be enabled while the external width is enabled.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:EWIDth<ws><Boolean> Arguments:

Type: Boolean Examples: :PULS:EWID ON

:PULS:EWID OFF

QUERY

Syntax: [:SOURce]:PULSe:EWIDth? Examples: :PULS:EWID?

Response: 0 | 1

4.12.1.15 Double Pulse State

This command is used to enable or disable the double pulse mode. In this mode, two pulses are generated per period. The first pulse is generated at the time of the signal trigger, and the second pulse

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is generated after a programmable delay. This delay is set by either the :PULSE:DELAY or the :PULSE:DOUBLE:DELAY command.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:DOUBle[:STATe]<ws><Boolean> Arguments:

Type: Boolean Examples: :PULS:DOUB ON

:PULS:DOUB:STAT OFF

QUERY

Syntax: [:SOURce]:PULSe:DOUBle[STATe]? Examples: :PULS:DOUB?

Response: 0 | 1

4.12.1.16 Double Pulse Delay

This command is used to set the delay of the second pulse, from the time of the trigger, in the double pulse mode. It has exactly the same effect as the :PULSE:DELAY command, and is included in the command set for compatibility purposes.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:DOUBle:DELay<ws><delay>[units] Arguments:

Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 0NS to 9.80000S Rounding: To current resolution Examples: :PULS:DOUB:DELay 150NS

QUERY

Syntax: [:SOURce]:PULSe:DOUBle:DELay? Examples: :PULS:DOUB:DEL?

Response: NRf

CONSIDERATIONS: The allowed range of the delay will be determined by the values of the period, width, and

transition times.

4.12.1.17 Leading Edge Time

This command is used to set the value of the leading edge time. If the edge-tracking feature is ON, changing the leading edge will cause the same change in the trailing edge.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:TRANsition[:LEADing]<ws><lead time>[units] Arguments:

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Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 5NS to 10MS Rounding: To current resolution Examples: :PULS:TRAN:LEAD 50NS :PULS:TRAN 85NS

QUERY

Syntax: [:SOURce]:PULSe:TRANsition[:LEADing]? Examples: :PULS:TRAN:LEAD?

Response: NRf

CONSIDERATIONS: The allowed value of the leading edge time is limited by the values of the period, width and

delay. In addition, the ratio between the transition times is limited to a maximum of 20:1, and both transition times must be in one o f the following ranges:

5ns to 100ns 50ns to 1 us 500ns to 10us 5us to 100us 50us to 1ms 500us to 10ms

4.12.1.18 Trailing Edge Time

This command is used to set the value of the trailing edge time. If the edge-tracking feature is ON, changing the trailing edge will cause the same change in the leading edge.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:TRANsition[:TRAiling]<ws><trail time>[units] Arguments:

Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 5NS to 10MS Rounding: To current resolution Examples: :PULS:TRAN:TRA 50NS :PULS:TRAN:TRAiling 85N S

QUERY

Syntax: [:SOURce]:PULSe:TRANsition[:TRAiling]? Examples: :PULS:TRAN:TRA?

Response: NRf

CONSIDERATIONS: The allowed value of the trailing edge time is limited by the values of the period, width and

delay. In addition, the ratio between the transition times is limited to a maximum of 20 :1, and both transition times must be in one of the following ranges:

5ns to 100ns 50ns to 1 us

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500ns to 10us 5us to 100us 50us to 1ms 500us to 10ms

4.12.1.19 Pulse Polarity

This command is used to control the polarity of the pulse, which may be normal or complemented. The COMPement and INVerted parameters are aliases: either may be used.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:SOURce]:PULSe:POLarity<ws><Option> Arguments:

Type: Character Options: NORMal – Nor mal pola rity COMPlement – complemeted INVerted – complemeted Examples: :PULS:POL NORM :PULS:POL INVerted

QUERY

Syntax: [:SOURce]:PULSe:POLarity? Examples: :PULS:POL?

Response: NORM | COMP

4.12.1.20 Channel Dependency

This command is used to control the dependency of channel 2. It can select either for channel 2 to be an independent channel, or set it t o be depend ent on channel 1. This means that channel 2 will have the same clock and trigger, as well as same frequency and period as channel 1.

COMMAND TYPE: Setting or Query SETTING

Syntax: :SOURce:COUP <Option> Arguments:

Type: Character Options: ON or 1– Dependent on channel 1

OFF or 0 – Independent Examples: :SOUR:COUP 1 :SOUR:COUP OFF

QUERY

Syntax: :SOURce: COUP? Examples: :SOUR:COUP?

Response: 1 | 0

Page 59

4.12.2 OUTPut Subsystem

The Output Subsystem c ontrols characteristi cs of the source’s out put. The OU TPut command contro ls whether the output is O N or OFF.

COMMAND TYPE: Setting or Query SETTING

Syntax: [:OUTPut]:STATe<ws><Boolean> Arguments:

Type: Boolean Examples: :OUTP:STAT ON :OUTP OFF

QUERY

Syntax: :OUTPut[:STATe]? Response: 0 | 1

MODEL 4034 ONLY:

To control output of channel 2, change the subsystem from :OUTP to :OUTP2. For example, to turn on output of channe l, send command :OUTP2:STAT ON.

4.12.3 Trigger Subsystem

The Trigger Subsystem is used to control the waveform triggering. It is not all SCPI compatible. The command structure is as follows:

:TRIGger

MODEL 4034 ONLY:

To control the trigger mode of channel 2, change the subsystem from :TRIG to :TRIG2. For example, to check trigger mode of channel 2, send the command : TRIG2:MODE?

4.12.3.1 Trigger Mode

This command is used to set the trigger mode. It is not a standard SCPI command. COMMAND TYPE: Setting or Query SETTING

Syntax: :TRIGger:MODE<ws><option> Arguments:

Type: Character Options: CONTinuous TRIGger GATE

Page 60

BURSt Examples: :TRIG:MODE CONT :TRIG:MODE BURS

QUERY

Syntax: :TRIGger:MODE? Response: CONT | TRIG | GATE | BURS

4.12.3.2 Trigger Source

This command is used to select the trigger source, for use in the Trigger, Gate and Burst trigger modes. COMMAND TYPE: Setting or Query SETTING

Syntax: :TRIGger:SOURce<ws><option> Arguments:

Type: Character Options: MANual – Front panel MAN key BUS – GPIB trigger (GET or *TRG) INTernal – Internal trigger EXTernal – External trigger Examples: :TRIG:SOUR BUS :TRIG:SOUR INT

QUERY

Syntax: :TRIGger:SOURce? Response: MAN | BUS | INT | EXT

4.12.3.3 Burst Count

Used to set the number of cycles to be output in the BURST mode. It is not a standard SCPI command. COMMAND TYPE: Setting or Query SETTING

Syntax: :TRIGger:BURSt<ws><value> Arguments:

Type: NRf Range: 2 to 999999 Rounding: To integer value Examples: :TRIG:BURS 100

QUERY

Syntax: :TRIGger:BURSt? Response: NRf Examples: :TRIG:BURSt?

4.12.3.4 Internal Trigger Rate

Sets the rate of the internal trigger. COMMAND TYPE: Setting or Query SETTING

Syntax: :TRIGger:TIMer<ws><value>[units]

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Page 61

Arguments:

Type: NRf Units: S (seconds), MS (milliseconds), US (microseconds), NS nanoseconds Range: 100NS to 99.99S Rounding: To current resolution Examples: :TRIG:TIM 10E-6 :TRIG:TIM 500US

QUERY

Syntax: :TRIGger:TIMer? Examples: :TRIG:TIM? Response: NR3

4.12.3.5 External Trigger Level

Used to control the trigger level of the external trigger. COMMAND TYPE: Setting or Query SETTING

Syntax: :TRIGger:LEVel<ws><trigger level>[units] Arguments:

Type: NRf Units: V, mV Range: –10V to +10V with 10mV resolution; 0V allowed Rounding: 10mV Examples: :TRIG:LEV 5 . 56

QUERY

Syntax: :TRIGger:LEVel? Examples: :TRIG:LEV? Response: NR3

4.12.3.6 Trigger Slope

This command is used to s et the external trigger slope on which to tri gger. COMMAND TYPE: Setting or Query SETTING

Syntax: :TRIGger:SLOPe<ws><Options> Arguments:

Type: Character Options: POSitive NEGative Examples: :TRIG:SLOP POS :TRIG:SLOP NEG

QUERY

Syntax: :TRIGger:SLOPe? Examples: :TRIG:SLOP? Response: POS | NEG

Page 62

4.12.4 Status Subsystem

This subsystem controls the SCPI-defined status reporting structures, which are the QUEStionable and OPERation status registers, and the error/event queue. The QUEStionable and OPERation status registers are mandated by SCPI, and so are implemented, but are not used by the hardware. No status is ever reported through them, a nd they are not detailed in this manual. The following shows the STATus struc ture used :

:STATus :PRESet :QUEue [:NEXT]?

4.12.4.1 Status Preset

This command is used to set certain status values to defined values.

- The OPERation and QUEStionable enable registers are cleared.

- The Positive transition filter s are set to 32767.

- The Negative transition filters are set to 0 .

Since the Questionable and Operation status registers are not used in the model 4033 and 4034, the PRESet command has no real effect.

COMMAND TYPE: Setting only SETTING

Syntax: :STATus:PRESet

4.12.4.2 Error Queue Read

This query returns the first entry in the error queue and removes that entry from the que ue. Its function is identical to that of the :SYSTem:ERRor? query.

COMMAND TYPE: Query only QUERY

Syntax: :STATus:QUEue[:NEXT]? Response: <error number>,

“<error description>“

4.12.5 System Subsystem

The SYSTem subsystem collects the functions that are not related to instrument performance. The functions implemented in the pulse generato r are security, GPIB address changing, error queue reading, SCPI version reading, and power-on buffer setting (not SCPI-defined). The command structure is as follows:

:SYSTem :COMMunicate :GPIB :ADDRess <numeric value> :ERRor? :VERSion? :SECurity [STATe] <Boolean> :POBuffer <numeric value>

Page 63

4.12.5.1 GPIB Address Change

This command is used to set the GPIB address. Setting the address to 31 puts the instrument in an 'offbus' state, in which it does not take par t in communication over the GPIB. Communication with the instrument can be resumed only by setting the address to a suitable value from the front panel.

COMMAND TYPE: Setting or Query SETTING

Syntax: :SYSTem:COMMunicate:GPIB:ADDRess<ws><address> Arguments:

Type: NRf Range: 0 to 31 Rounding: To integer value Examples: :SYST:COMM:GPIB:ADDR 20

QUERY

Syntax: :SYSTem:COMMunicate:GPIB:ADDRess? Response: <address> in NR1 format

4.12.5.2 Error Queue Reading

This query returns the first entry i n the error queue, and removes tha t entry from the queue. It's function is identical to that of the :STATus:QUEue:NEXT? query.

COMMAND TYPE: Query only QUERY

Syntax: :SYSTem:ERRor? Response: <error number>,

“<error description>“

4.12.5.3 SCPI Version

This query is used to re ad the SCPI ve rsion to whi ch the instrument complies. COMMAND TYPE: Query only QUERY

Syntax: :SYSTem:VERSion? Response: 1992.0 (NR2 format)

4.12.5.4 Security

This command enables the instrument memory to be cleared. The stored settings are cleared when the Security state is changed from ON to OFF, and the instrument state is returned to the factory power-on default.

COMMAND TYPE: Setting or Query SETTING

Syntax: :SYSTem:SECurity[:STATe]<ws><boolean> Arguments:

Page 64

Type: Boolean Examples: :SYST:SE C O N :SYST:SEC OFF

QUERY

Syntax: :SYSTem:SECurity[:STATe]? Response: 0 | 1

4.12.5.5 Power-on Buffer

This command is used to set the Power On Buffer setting. The instrume nt will power-on with t he setting stored in that buffer. Setting the value to 99 will result in the instr ument powering up in the state it was in before it was powered down.

COMMAND TYPE: Setting or Query SETTING

Syntax: :SYSTem:POBuffer<ws><buffer> Arguments:

Type: Numeric Range: 0 to 99 Rounding: To integer value Examples: :SYST:POB 99

QUERY

Syntax: :SYSTem:POBuffer? [<ws>MINimum | M AXimum] Response: Power-on buffer in NR1 format.

4.13 IEEE 488.1 Interface Messages

4.13.1 GET - Group Execute Trigger

The GET is used by the pulse generator as a trigger when it is in either the TRIGGER, GATE or BURST mode s, with the trigger source set to BUS. It has the same effect as the *TRG common command.

4.13.2 DCL - Dev ice C lear

In response to the DCL, the PG does the following: a) Cle ars the input buffer and the output queue. b) Resets the Message Processing Functions.

4.13.3 SDC - Selected Device Clear

The response is as for the DCL message, when device is addressed to listen.

4.13.4 LLO - Local Lockout

Sending LLO when device is addressed to listen and controller is asserting the REN line will put the device into "Remote with Lock out" state , locking out the front panel.

Page 65

4.14 SCPI Command Tree

[:SOURce]

:FREQuency

[:CW FIXed]

<NRf>

:VOLTage

:PULSe

[:LEVel]

[IMMediate]

:HIGH

<NRf>

:LOW

<NRf>

:PHIGh

<NRf>

:PLOW

<NRf>

:PREDefined

TTL | CMOS | ECL | USER

:LIMit

:PERiod

<NRf>

:WIDTh

<NRf>

:DELay

<NRf>

:EWIDth

:EACCuracy

:HOLD

WIDTh | DCYCle

:POLarity

NORMal | COMPLement | INVerted

:DELay

<NRf>

[:STATe]

:DOUBle

:TRANsition

[:LEADing]

<NRf>

:TRAiling

<NRf>

:AUTO

<Boolean> | ONCE

:HIGH

<NRf>

:LOW

<NRf>

Root

[:SOURce]

:OUTPut

:TRIGger

:STATus

:SYSTem

4.14.1 Root Node

4.14.2 SOURce Subsy stem

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4.14.3 OUTPut Subsystem

:STATus

[:EVENt]?

:CONDition?

:NTRansition

<NRf>

:PTRansition

<NRf>

:ENABle

<NRf>

:OPERation

:PRESet

:QUEue

[:NEXT]?

[:EVENt]?

:CONDition?

:NTRansition

<NRf>

:PTRansition

<NRf>

:ENABle

<NRf>

:OPERation

:TRIGger

:SLOPe

POS | NEG

:LEVel

<NRF>

:TIMer

<NRf>

:SOURce

INT | EXT | MAN | BUS

:BURSt

<NRf>

:MODE

CONT|TRIG|GATE|BURS

:OUTPut

[:STATe]

ON | OFF

4.14.4 TRIGger Subsystem

4.14.5 STATus Subsystem

Page 67

4.14.6 SYSTem Subsystem

Hex

Oct

Dec

ASCII

Msg

Hex

Oct

Dec

ASCII

Msg

000 0 NUL 20

040

MLA0

001 1 SOH

GTL

041

33 ! MLA1

002 2 STX 22

042

34 " MLA2

003 3 ETX 23

043

35 # MLA3

004 4 EOT

SDC

044

36 $ MLA4

005 5 ENQ

PPC

045

37 % MLA5

006 6 ACK 26

046

38 & MLA6

007 7 BEL 27

047

39 ' MLA7

010 8 BS

GET

050

40 ( MLA8

011 9 HT

TCT

051

41 ) MLA9

012

LF 2A

052

42 * MLA10

013

VT 2B

053

43 + MLA11

014

FF 2C

054

44 , MLA12

015

CR 2D

055

45 - MLA13

016

SO 2E

056

46 . MLA14

017

SI 2F

057

47 / MLA15

020

DLE 30

060

48 0 MLA16

021

DC1

LLO

061

49 1 MLA17

022

DC2 32

062

50 2 MLA18

023

DC3 33

063

51 3 MLA19

024

DC4

DCL

064

52 4 MLA20

025

NAK

PPU

065

53 5 MLA21

026

SYN 36

066

54 6 MLA22

027

ETB 37

067

55 7 MLA23

030

CAN

SPE

070

56 8 MLA24

031

SPD

071

57 9 MLA25

032

SUB 3A

072

58 : MLA26

033

ESC 3B

073

59 ; MLA27

034

FS 3C

074

60 < MLA28

:SYSTem

:COMMunicate

:GPIB

:ADDRess

<NRf>

:ERRor?

:SECurity

[:STATe]?

ON | OFF

:POBuffer

<NRf>

:VERSion?

4.15 ASCII and GPIB Code Chart

Page 68

035

GS 3D

075

61 = MLA29

036

RS 3E

076

62 > MLA30

037

US 3F

077

63 ? UNL

Message Definitions

DCL

Device Clear

MSA

My Secondary Address

GET

Group Execute Trigger

MTA

My Talk Address

GTL

Go To Local

PPC

Parallel Poll Configure

LLO

Local Lockout

PPD

Parallel Poll Disable

MLA

My Listen Address

Hex

Oct

Dec

ASCII

Msg

Hex

Oct

Dec

ASCII

Msg

100

64 @ MTA0

140

96 ` MSA0,PPE

101

65 A MTA1

141

97 a MSA1,PPE

102

66 B MTA2

142

98 b MSA2,PPE

103

67 C MTA3

143

99 c MSA3,PPE

104

68 D MTA4

144

100 d MSA4,PPE

105

69 E MTA5

145

101 e MSA5,PPE

106

70 F MTA6

146

102 f MSA6,PPE

107

71 G MTA7

147

103 g MSA7,PPE

110

72 H MTA8

150

104 h MSA8,PPE

111

73 I MTA9

151

105 i MSA9,PPE

112

74 J MTA10

152

106 j MSA10,PPE

113

75 K MTA11

153

107 k MSA11,PPE

114

76 L MTA12

154

108 l MSA12,PPE

115

77 M MTA13

155

109 m MSA13,PPE

116

78 N MTA14

156

110 n MSA14,PPE

117

79 O MTA15

157

111 o MSA15,PPE

120

80 P MTA16

160

112 p MSA16,PPD

121

81 Q MTA17

161

113 q MSA17,PPD

122

82 R MTA18

162

114 r MSA18,PPD

123

83 S MTA19

163

115 s MSA19,PPD

124

84 T MTA20

164

116 t MSA20,PPD

125

85 U MTA21

165

117 u MSA21,PPD

126

86 V MTA22

166

118 v MSA22,PPD

127

87 W MTA23

167

119 w MSA23,PPD

130

88 X MTA24

170

120 x MSA24,PPD

131

89 Y MTA25

171

121 y MSA25,PPD

132

90 Z MTA26

172

122 z MSA26,PPD

133

91 MTA27

173

123 { MSA27,PPD

134

92 \ MTA28

174

124 | MSA28,PPD

Page 69

135

93 MTA29

175

125 } MSA29,PPD

136

94 ^ MTA30

176

126 ~ MSA30,PPD

137

95 _ UNT

177

127

DEL

Message Definitions

PPE

Parallel Poll Enable

SPE

Serial Poll Enable

PPU

Parallel Poll Unconfigure

TCT

Take Control

SDC

Selected Device Clear

UNL

Unlisten

SPD

Serial Poll Disable

UNT

Untalk

4.16 RS-232 Pr o g ramming

4.16.1 General

The INSTALLATION se ction of this manual describes the RS-232-C con nection for the instru ment. Be sure that you have the Remote Mode set to RS-232 and correctly set the baud rate.

Data signals over the RS-232-C use a voltage of +3V to +25V to represent a zero (called a space) and a voltage of

4.16.2 RS-232-C Operation

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BK Precision BK Precision 4033 Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Section 1

Introduction

1.1 Introduction

1.2 Description

1.3 Safety Remarks

1.4 Package Contents

Specifications

NOTE

Section 2

Installation

2.1 Introduction

2.2 Mechanical Inspection

2.3 Initial Inspection

2.4 Instrument Mounting

2.5 Product Dimensions

2.6 Power Requirements

2.7 Grounding Requirement s

2.8 Signal Connections

2.8.1 Maintaining Pulse Fidelity

2.8.2 Impedance Matching

2.8.3 Rise Time Measurements in Linear Systems

2.9 RS-232 Connection

2.10 RS-232 Configuration

2.11 GPIB Address

2.12 GPIB Connections

3.1 General Descripti on

Section 3

Operating Instructions

3.2 Display Window

3.3 Front Panel Controls

3.4 Back Panel Controls

3.5 Output connectors

3.6 MENU Keys

3.6.1 PARAMETER Menu

3.6.2 OUTPUT Menu

3.6.3 PULSE Menu

3.6.4 MODE Menu

3.6.5 SETUPS Menu

3.6.6 UTILITY Menu

3.7 ON Ke y

3.8 Cursor Movement Keys

3.9 Rotary Input Knob

3.10 Power-On Settings

3.11 Memory

3.12 Displaying Errors

3.13 Pulse Definitions

3.14 Pulse Parameter Limitations

3.15 Pulse Definitions

4.1 Overview

4.1.1 GPIB

Section 4

Programming

4.1.2 RS-232-C

4.2 Device State

4.2.1 Local State (LOCS)

4.2.2 Local With Lockout State (LWLS)

4.2.3 Remote State (REMS)

4.2.4 Remote With Lockout State (RWLS)

4.3 Interface Functi on S ubs e t s

4.4 Device Address

4.5 Message Exchange Protocol

4.5.1 The Input Buffer

4.5.2 The Output Queue

4.5.3 Response Messages

4.5.4 Coupled Commands

4.6 Instrument Identification

4.7 Instrument Reset

4.8 Self Test

4.9 Command Syntax

4.9.1 Gene r al Command Structure

4.9.2 The Progr am Message

4.9.2.1 Program Message Header

4.9.2.2 Program Message Header Separator

4.9.2.3 Program Message Data

4.9.3 SCPI Comm and Structure

4.10 Status Reporting