Stanford Research Systems DG535 Operation manual

MODEL DG535

Digital Delay / Pulse Generator

1290-D Reamwood Avenue

Sunnyvale, CA 94089 U.S.A.

Phone: (408) 744-9040, Fax: (408) 744-9049

Revision 2.5

11/2000

DG535 DIGITAL DELAY / PULSE GENERATOR

OPERATION AND SERVICE MANUAL

Table of Contents

CONDENSED INFORMATION

Safety and Preparation for Use v

Quick-Start Instructions vi

DG535 Specifications vii

Abridged GPIB Command List viii

Error Status Byte Definition ix

Instrument Status Byte Definition ix

GUIDE TO OPERATION

Introduction 1

Front Panel Features 1

Power Button 1

Liquid Crystal Display 1

Menu Keys 1

Data Entry Keys 1

Trigger Status LED's 1

Delay Outputs 1

Pulse Outputs 2

Option 06 - Trigger Inhibit Input 2

Rear Panel Features 2

Power Entry Module 2

IEEE-488 Standard Port 2

10.000 MHz Reference 2

Option 02 - ±35 Volt Rear Panel Outputs 3

Front Panel Programming 3

Trigger Menu 4

Trigger Submenus 4

Trigger Tricks 4

Delay Menus 5

Output Menus 5

AB and CD Outputs 6

GPIB Menus 6

Store and Recall Menus 7

ACCURACY, DRIFT, AND JITTER

Accuracy 7

Timebase Drift 8

Jitter 8

Channel to Channel Interaction 8

Time Delay vs Repetition 9

GPIB PROGRAMMING

Detailed Command List 10

Initialization Commands 10

Status Commands 10

Error Status Byte Definition 10

Instrument Status Byte Definition 11

Display Control Commands 12

Delay and Output Commands 14

Delays 14

Output Control 14

Trigger Commands 15

Store and Recall Commands 16

TROUBLESHOOTING

LCD Contrast 17

Cold-Boot 17

Quick Test 17

Output Levels 17

Jitter 17

GPIB Problems 18

CALIBRATION

Required Equipment 19

Calibration Procedure 19

Trigger Threshold Calibration 19

Optional 1 ppm Internal Timebase Calibration 19

Output Amplitude Calibration 20

Calibration Menus 20

Output Offset Calibration 21

Jitter Calibration 21

Jitter Cal Factor 21

Delay Cal Factor 21

CIRCUIT DESCRIPTION

Microprocessor System 22

IEEE-488 Interface 22

Keypad and LED Indicators 22

LCD Display 22

Output Ports on the Top PCB 22

Output Ports on the Bottom PCB 22

Port Address Decoding 23

Input Ports 23

Digital to Analog Converter 24

Timebase 24

iii

Frequency Synthesizer 24

Line Trigger 24

Trigger Selection 24

Trigger Circuits 25

Trigger Sequence 25

Overview of the Delay Channels 25

Jitter Compensation 26

Jitter Precharge and Sample & Hold 26

Kickpulse 27

The T0 Delay 27

Channel A's Digital Delay 27

Analog Delays 27

Reset Cycle and Status Bits 28

Output Drivers 28

Offset Control 28

Impedance Control 29

Gate Output Drivers 29

Power Supplies 29

Rear Panel Output Drivers 30

PARTS LISTS

Top PCB 32

Bottom PCB 32

Front PCB 37

Optional Outputs PC Board 37

Miscellaneous and Chassis Assembly 38

PC LAYOUT

Top PCB 39

Bottom PCB 40

Front PCB 41

Optional Outputs PCB 41

FAST TRANSITION-TIME MODULES 42

SCHEMATIC DIAGRAMS 45

Top PCB

Sheet #1 Microprocessor System, GPIB and Digital I/O

Sheet #2 Slow Counter/Timers

Sheet #3 Trigger Status and Reset Sequence

Sheet #4 Rate Generators

Sheet #5 Power Supply and Dropout Detection

Sheet #6 System Connectors and Polarity Control

Bottom PCB

Sheet #1 Trigger Circuit and Gated 80 MHz

Sheet #2 10 MHz Reference and 80 MHz PLL

Sheet #3 Jitter Compensation

Sheet #4 ECL Counters and Resync Circuits

Sheet #5 T0 Analog Delay and Output Driver

Sheet #6 A Analog Delay and Output Driver

Sheet #7 B Analog Delay and Output Driver

Sheet #8 C Analog Delay and Output Driver

Sheet #9 D Analog Delay and Output Driver

Sheet #10 AB & CD Gate Output Drivers

Sheet #11 Digital to Analog Converter and Multiplexer

Sheet #12 Power Regulators

Front PCB

Optional Outputs PCB

Table of Figures

Figure - 1 DG535 Rear Panel Page - 2

Figure - 2 DG535 Front Panel Page - 3

Figure - 3 Maximum Error vs. Time Delay Page - 6

Figure - 4 Apparent (Peak To Peak) Jitter and RMS Jitter Page - 7

Figure - 5 RMS Jitter Page - 8

Figure - 6 DG535 Block Diagram Page - 30

Figure - 7 DG535 Timing Diagram Page - 31

Figure - 8 Top PC Layout Page - 39

Figure - 9 Bottom PC Layout Page - 40

Figure - 10Front PC Layout Page - 41

Figure - 11Optional Outputs PC Layout Page - 41

Figure - 12Fast Transition-Time Modules Page - 42

Figure - 13Fast 2 Volt Output Step Page - 44

SAFETY AND PREPARATION FOR USE

******CAUTION******

This instrument may be damaged if it is

operated with the LINE VOLTAGE

SELECTOR set for the wrong ac line voltage

or if the wrong fuse is installed.

LINE VOLTAGE SELECTION

The DG535 operates from a 100V, 120V,

220V or 240V (50 or 60 Hz) ac power source.

Before applying a power source, verify that

the line voltage selector card (located in the

rear panel power entry module) is in the

correct position. The selected voltage may be

seen through the clear window by viewing the

power entry module from below.

To change the line voltage selection, remove

the line cord, slide the window to the right,

and pull the "fuse pull" lever out. Verify that

the correct fuse is installed for the ac line

voltage: 1 Amp for 100 or 120V, and 1/2 Amp

for 220 or 240V. Pull out the line voltage

selector card with a pair of needle nose pliers,

and insert it with the correct line voltage

facing the bottom of the instrument and

towards the line cord. Verify that the correct

line voltage can be seen through the slot that is

just above thefuse holder. Push the fuse holder

back in, and install the correct fuse. Slide the

window to the left, and replace the line cord.

LINE CORD

The DG535 uses a three wire power cord for

connection to the power source and to a

protective ground. The exposed metal parts of

the instrument are connected to the outlet

ground: to protect against electrical shock,

always use an outlet which has a properly

connected protective ground.

To avoid shock or injury do not remove

product covers or panels. Do not operate the

product without all covers and panels in place.

CONNECTION TO OTHER

INSTRUMENTS

All front panel BNC shields are connected to

the chassis ground and to the power outlet

ground via the power cord. Do not apply any

voltage to either the shields or to the outputs.

The outputs are not protected against

connection to any potential other than ground.

QUICK START INSTRUCTIONS

(1) Make certain that the correct line voltage is selected on the rear panel.

(2) Press the power button "in" to turn on the unit.

(3) Press the RECALL Menu key, the "0" digit, and the EXC key in sequence to

recall default settings.

(4) Press the left cursor key (<) twice to select internal trigger.

(5) Trigger the oscilloscope on the rising edge of T0's output, and display A's

output on the 1µs/div scale.

(6) Press the DELAY Menu key and use the cursor keys to change the A delay

from 0.0 seconds.

(7) If you ever change the OUTPUT Menu, be sure to specify the correct

load impedance.

(8) If you have problems, read the detailed descriptions and troubleshooting

sections that follow.

vii

DG535 SPECIFICATIONS

DELAYS Channels Four independent delay outputs : A, B, C and D

Range 0 to 999.999,999,999,995 seconds

Resolution 5 ps

Accuracy 1500 ps + timebase error x delay

Timebase Standard: 25 ppm crystal oscillator

Optional: 1ppm TCXO (Opt. 03)

External: user provides 10.0 MHz reference

RMS Jitter Ext Trig to any output: 60 ps + delay x 10-8

T0 to any output: 50 ps + delay x 10-8

Trig Delay Ext Trig to T0 output : 85 ns

INTERNAL RATE GENERATOR Rate Single shot, .001 Hz to 1.000 MHz, or Line

Resolution 0.001 Hz below 10 Hz, otherwise 4 digits

Accuracy Same as timebase

Jitter 1:10,000

Settling <2 seconds for any rate change

Burst Mode 2 to 32766 pulses per burst at integer multiples

(4 to 32767) of the trigger period

INPUTS External Trigger Rate: dc to 1/(1 µs + longest delay)

Threshold: ±2.56 Vdc

Slope: Trigger on rising or falling edge

Impedance: 1 MΩ+ 40 pF or 50Ω

Option 06 TTL front panel trigger inhibit input.

OUTPUTS T0, A, B, C, D, AB, -AB, CD and -CD

Load 50Ωor high impedance

Risetime 2 to 3 ns (typical)

Slew Rate 1 Volt/ ns

Overshoot <100mV + 10% of pulse amplitude

Levels TTL: 0 to 4 Vdc, normal or inverted

ECL: -1.8 to -.8 Vdc, normal or inverted

NIM: -.8 to 0 Vdc, normal or inverted

VAR: Adjustable offset and amplitude

between -3 and +4 Vdc with 4V

maximum step size

Accuracy 50 mV + 3% of pulse amplitude

Option 02 Rear panel T0, A, B, C, D outputs for 1µs

pulses, amplitudes typically x8 of corresponding front

outputs at 1kHz rep. rate. Output level is reduced by

2V/mA of additional average output current.

COMPUTER INTERFACE IEEE488 Standard GPIB

SH1, AH1, T6, TE0, L4, LEO, SR1, RL1, PP0, DC1, DT1, C0 and E1.

256 characters are remembered in the command buffer.

All instrument functions and settings may be controlled over the

interface bus.

GENERAL Dimensions: 14" x 8.5" x 4.75"

Weight: 10 lbs

Power: 70 Watts from 100, 120, 220, or 240 Vac

Warranty: One year parts and labor on materials and workmanship.

viii

ABRIDGED COMMAND LIST

INITIALIZATION

CL Clear instrument

GT{i}{,j}{,k} Specify one to three ASCII codes which will terminate each response from the DG535

STATUS

ES Returns the Error Status byte

ES i Returns bit i of the Error Status Byte

IS Returns the Instrument Status byte

IS i Returns bit i of the Instrument Status Byte

SM {i} Set Status Mask for service request to i.

DISPLAY

DL {i,j,k} Select Display Line to menu i, submenu j, line k.

CS {i} Set Cursor Mode (i=0) or Number mode (i=1)

SC {i} Move cursor to column i= 0 to 19

MC i Move cursor left (i=0) or right (i=1)

IC i Increment (i=1) or decrement (i=0) the digit at the current cursor location.

DS string Display a string of 1-20 characters. Do not use spaces (use_underline_instead) or

semicolons.

DS Clear Display String

DELAYS

DT i{,j,t} Delay Time of channel i is set to t seconds relative to channel j. Example:

DT 3,2,1.2E-6 will set B=A+000.000,001,200,000 seconds

OUTPUTS

TZ i{,j} Set the Termination Impedance (Z). Output i is configured to drive a 50Ωload (j=0)

or a high-Z load (j=1)

OM i{,j} Set Output i to Mode j where j=0,3 for TTL, NIM, ECL, or VARiable.

OA i{,v} Output amplitude of output i is set to v Volts if in the VARiable mode

OO i{,v} Output Offset of output i is set to v Volts if in the VARiable mode

OP i{,j} Output Polarity of channel i is inverted (j=0) or normal (j=1) for TTL, ECL or NIM.

TRIGGER

TM {i} Set Trigger Mode to Int, Ext, SS or Burst (i=0,1,2,3)

TR i{,f} Set Int Trigger Rate (i=0) or Burst Trigger Rate (i=1) to f Hz.

TZ 0{,j} Set Trigger input impedance to 50Ω(i=0) or to high impedance (j=1)

TL {v} Set External Trigger Level to v Volts.

TS {i} Trigger Slope set to falling (i=0) or Rising Edge (i=1)

SS Single-Shot trigger if Trigger Mode = 2

BC {i} Burst Count of i (2 to 32766) pulses per burst

BP {i} Burst period of i (4 to 32766) triggers per burst

STORE and RECALL

ST i Store all instrument settings to location i=1 to 9

RC i Recall all settings from location i=1 to 9 Default settings may be recalled from location 0.

NOTES

In all of the commands listed here, i, j and k

are integer values and f, t and v may be

integer, floating point or exponential notation.

Optional parameters are enclosed in curly

brackets. If optional parameters are omitted

then the current value of those parameters will

be sent back to the GPIB controller. For

example, the command "TM 3" sets the

Trigger Mode to mode 3 while the command

"TM" will return the response "3".

Also, blanks are ignored, case is ignored,

multiple commands may be sent on one line if

separated by semicolons. All responses are

terminated by a carriage return and a line feed.

The line feed is sent with an EOI.

The Delay and Output commands use integer

codes which are assigned to each front panel

BNC. The table for these assignment is given

below.

Integer Assignment

0 Trigger Input

1 T0 Output

2 A Output

3 B Output

4 AB and -AB Outputs

5 C Output

6 D Output

7 CD and -CD Outputs

ERROR STATUS BYTE INSTRUMENT STATUS BYTE

Bit Description Bit Description

7 Always zero 7 Memory contents corrupted

6 Recalled data was corrupt 6 Service request

5 Delay range error 5 Always zero

4 Delay linkage error 4 Trigger rate too high

3 Wrong mode for the command 3 80MHz PLL is unlocked

2 Value is outside allowed range 2 Trigger has occurred

1 Wrong number of parameters 1 Busy with timing cycle

0 Unrecognized command 0 Command error detected

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