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Triggering Analog Measurements In Remote Mode (GPIB Operation)
1. Select the desired trigger mode.
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GPIB Syntax|
"TRIG:MODE:RETR REP" !selects Repetitive retriggering mode.
"TRIG:MODE:RETR SING" !selects Single retriggering mode.
TRIG:MODE:SETT FULL" !selects Full settling mode.
"TRIG:MODE:SETT FAST" !selects Fast settling mode.
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Triggering Analog Measurements In Remote Mode (GPIB Operation)
Retriggering
•
Repetitive - Once a measurement cycle has completed the Test Set is automat-
ically re-triggered and another measurement cycle begins.
When the trigger mode is set to repetitive retriggering, consecutive queries of the
same measurement return new measured values.
•
Single - Once a measurement cycle has completed the Test Set requires an
GPIB trigger command be received to begin a new measurement cycle.
When the trigger mode is set to single retriggering, consecutive queries of the
same measurement (with no intervening trigger) will return the same value. Mea-
surements that rely on external signals or hardware-generated events (such as Traf-
fic Rho) must be re-armed with a new trigger before another measurement can be
made.
Settling
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Full - Appropriate time delays introduced into measurement cycle to allow inter-
nal or external signal transients to settle.
•
Fast - No time delay introduced into measurement cycle to allow internal or ex-
ternal signal transients to settle.
The programmer must account for transient settling before issuing a trigger com-
mand.
There will still be delays introduced by the couplings between autotuning and
autoranging. If the programmer wishes to remove these delays as well, all autor-
anging and autotuning functions must be turned OFF and the program must explic-
itly set the ranging amplifiers and the frequency tuning. Delays introduced by the
measurement processes themselves cannot be eliminated.
Chapter 3, Operating Overview
83
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