ii Table of Contents
SR620 Universal Time Interval Counter
Timebase Specifications 24
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 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 Messages 57
CAL Error Messages 57
Common Operational Problems 57
Error Messages 57
Error Indicators 58
Wrong Value 58
Excessive Jitter 58
Scope Display Problems 58
Printer and Plotter Problems 58
GPIB Interface Problems 58
RS-232 Interface Problems 59
Performance Tests 61
Necessary Equipment 61
Functional Tests 61
Front Panel Test 61
Self-Test 61
Trigger Input Tests 61
Counter Channel Tests 62
Rear Panel Tests 62
Performance Tests 63
Timebase Frequency 63
Accuracy 63
Time Interval 63
Trigger Sensitivity 63
Trigger Accuracy 64
D/A Output Accuracy 64
DVM Input Accuracy 64
Test Scorecard 67
Calibration 69
Overview 69
Calibration Bytes 69
Simple Calibration 70
Complete Calibration 70
Trigger Input Calibration 70
Clock Oscillator Calibration 71
Insertion Delay Calibration 71
D/A Output Calibration 72
DVM Input Calibration 73
SR620 Circuitry
Circuit Description 75
Processor System 75
GPIB Interface 75
Printer Interface 75
RS-232 Interface 76
Scope Display 76
Counter Input Ports 76
Display Control Ports 76
Front-End Status Bits 77
ADC and DAC Control Bits 77
REF OUT 78
Delay and Gate Generator 78
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