MODEL SR620 - Stanford Research Systems

1 MODEL SR620 Universal Time Interval Counter 1290-D Reamwood Avenue Sunnyvale, California 94089 Phone: (408) 744-9040 Fax: (408) 744-9049 email: Copyright 1989, 2006, 2019 by SRS, Inc. All Rights Reserved. Revision (11/2019) SR620 Universal Time Interval Counter Table of Contents i SR620 Universal Time Interval Counter Table of Contents Condensed Information Safety and Use v SRS Symbols vi Specifications vii Abridged Command List xi Operation Quick Start Instructions 1 Instrument Overview 2 Front Panel Operation 3 Choosing the Measurement

2 3 Setting the Mode 3 Setting the Source 3 Setting the Arming Mode 3 Setting the Number of Samples 3 Starting Measurements 3 Arming Mode Summary 4 Choosing the Output Display 5 Setting the Front Panel Display 5 Graphics Outputs 6 Graph Types 6 Scaling Graphs 6 Graphics Cursor 6 Graphics Zoom 6 Hardcopy Output 7 Chart Outputs 7 Setting the Inputs 9 Setting Trigger Levels 9 Setting Trigger Slopes 9 Input Termination 9 UHF

3 Prescalers 9 Input Coupling 10 Reference Output 10 Timebase Input and Output 10 DVM Inputs 10 Sample Arming 11 TIME Mode 11 Time Interval Arming 11 +TIME 11 +TIME, EXT 12 +TIME, EXT with HOLDOFF 12 +/-TIME 12 +/-TIME, EXT 12 Width Arming 13 WIDTH:+TIME 13 WIDTH:+TIME, EXT 13 WIDTH.

4 +TIME, EXT with HLDF 13 Rise and Fall Time Arming 13 RISE/FALL: +TIME 13 RISE/FALL: EXT 13 Frequency Arming 14 Frequency Ratio 14 Period Arming 14 Period Ratio 14 Phase Arming 14 Count Arming 15

5 Count Ratio 15 Delayed Arming Modes 15 Configuration Menus 17 CONTROL Menu 17 GPIB Parameters 17 RS232 Parameters 17 CALIBRATION Menu 17 AutoCal 18 Clock Source 18 OUTPUT Menu 18 Graphics Enable 18 Printer/Plotter Control 18 Jitter Type Selection 19 Gate

6 Scale Multiplier 19 Trigger Knob Range 19 SCAN Menu 19 Enabling Scans 19 Setting D/A outputs 20 Scanning the D/A's 20 External Trigger Delays 20 Scan Examples 20 Specification Guide 23 Definition of Terms 23 Least Significant Digit 23 Resolution 23 Error 23 Differential Non-linearity 23 ii Table of Contents SR620 Universal Time Interval Counter Timebase Specifications 24

7 Short-Term Stability 24 Long-Term Stability 24 External Timebases 25 Trigger Input Specifications 25 Measurement Accuracy 26 Programming Programming the SR620 29 Communications 29 GPIB Communication 29 RS-232 Communication 29 Data Window 29 Command Syntax 29 Detailed Command List 30 Trigger Commands 30 Measurement Control 31 Data Transmission 32 Binary

8 Dump 33 Scan Control 34 Graphics Control 35 Front Panel Control 36 Interface Control 37 Status Reporting 39 Calibration Commands 39 Serial Poll Status Byte 40 Event Status Byte 41 TIC Status Byte 41 Error Status Byte 41 Programming Examples 43 BASIC and RS-232 44 FORTRAN/National Instruments 45 BASIC/GPIB/Binary Dump 46 FORTRAN/GPIB/Binary Dump 48 C/GPIB/Binary Dump 52 Test and Calibration Troubleshooting Tips 57 Troubleshooting 57 Power-up Error

9 Messages 57 CAL Error Messages 57 Common Operational Problems 57 Error Messages