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S:\HP8924C\USRGUIDE\BOOK\chapters\opoverv.fb
Chapter 3, Operating Overview
Triggering Analog Measurements In Remote Mode (HP-IB Operation)
2. Trigger all active analog measurements (applies if trigger mode is "Single")
HP-IB Syntax
"TRIG" !triggers all active analog measurements.
HP-IB Example Program
10 OUTPUT 714;"DISP RFAN"
20 OUTPUT 714;"TRIG:MODE:RETR SING;SETT FULL"
30 OUTPUT 714;"TRIG"
40 END
HP-IB Example Program Comments By Line
10 !Selects RF Analyzer screen
20 !Sets the Test Set’s remote trigger mode to Single retriggering and Full settling
30 !Triggers all active analog measurements
Preventing HP-IB Bus Lockup
HP-IB bus lockup is a condition where the HP-IB bus and the Active Controller
handshake are in a temporary holdoff state while the Active Controller waits to read the
measurement result from the Test Set. If a measurement cycle does not successfully obtain
a valid measurement result, it will continue to try until it does or until the measurement
trigger is aborted. This is true for both retriggering modes. This has the consequence of
putting the HP-IB in the lockup state.
The control program should include measurement time-out routines that CLEAR the bus
and ABORt the trigger if a measurement does not complete within a specified amount of
time. This provides a method of preventing the bus from remaining in the temporary
holdoff state indefinitely.
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