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Time Delay vs Repetition 9 GPIB PROGRAMMING Detailed Command List Initialization Commands Status Commands Error Status Byte Definition Instrument Status Byte Definition Display Control Commands Delay and Output Commands Delays Output Control Trigger Commands Store and Recall Commands 10 10 10 10 11 12 14 14 14 15 16 TROUBLESHOOTING LCD Contrast Cold-Boot Quick Test Output Levels Jitter GPIB Problems 17 17 17 17 17 18 CALIBRATION Required Equipment Calibration Procedure Trigger Threshold Calibration Optional 1 ppm Internal Timebase Calibration Output Amplitude Calibration Calibration Menus Output Offset Calibration Jitter Calibration Jitter Cal Factor Delay Cal Factor 19 19 19 19 20 20 21 21 21 21 CIRCUIT DESCRIPTION Microprocessor System IEEE-488 Interface Keypad and LED Indicators LCD Display Output Ports on the Top PCB Output Ports on the Bottom PCB Port Address Decoding Input Ports Digital to Analog Converter Timebase 22 22 22 22 22 22 23 23 24 24 ii