Time Interval and Frequency Counter
Time Interval and Frequency Counter
Time Interval and Frequency Counter
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iiTable of Contents<strong>Time</strong>base Specifications 24Short-Term Stability 24Long-Term Stability 24External <strong>Time</strong>bases 25Trigger Input Specifications 25Measurement Accuracy 26ProgrammingProgramming the SR620 29Communications 29GPIB Communication 29RS-232 Communication 29Data Window 29Comm<strong>and</strong> Syntax 29Detailed Comm<strong>and</strong> List 30Trigger Comm<strong>and</strong>s 30Measurement Control 31Data Transmission 32Binary Dump 33Scan Control 34Graphics Control 35Front Panel Control 36Interface Control 37Status Reporting 39Calibration Comm<strong>and</strong>s 39Serial Poll Status Byte 40Event Status Byte 41TIC Status Byte 41Error Status Byte 41Programming Examples 43BASIC <strong>and</strong> RS-232 44FORTRAN/National Instruments 45BASIC/GPIB/Binary Dump 46FORTRAN/GPIB/Binary Dump 48C/GPIB/Binary Dump 52Test <strong>and</strong> CalibrationTroubleshooting Tips 57Troubleshooting 57Power-up Error Messages 57CAL Error Messages 57Common Operational Problems 57Error Messages 57Error Indicators 58Wrong Value 58Excessive Jitter 58Scope Display Problems 58Printer <strong>and</strong> Plotter Problems 58GPIB Interface Problems 58RS-232 Interface Problems 59Performance Tests 61Necessary Equipment 61Functional Tests 61Front Panel Test 61Self-Test 61Trigger Input Tests 61<strong>Counter</strong> Channel Tests 62Rear Panel Tests 62Performance Tests 63<strong>Time</strong>base <strong>Frequency</strong> 63Accuracy 63<strong>Time</strong> <strong>Interval</strong> 63Trigger Sensitivity 63Trigger Accuracy 64D/A Output Accuracy 64DVM Input Accuracy 64Test Scorecard 67Calibration 69Overview 69Calibration Bytes 69Simple Calibration 70Complete Calibration 70Trigger Input Calibration 70Clock Oscillator Calibration 71Insertion Delay Calibration 71D/A Output Calibration 72DVM Input Calibration 73SR620 CircuitryCircuit Description 75Processor System 75GPIB Interface 75Printer Interface 75RS-232 Interface 76Scope Display 76<strong>Counter</strong> Input Ports 76Display Control Ports 76Front-End Status Bits 77ADC <strong>and</strong> DAC Control Bits 77REF OUT 78Delay <strong>and</strong> Gate Generator 78SR620 Universal <strong>Time</strong> <strong>Interval</strong> <strong>Counter</strong>
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