HP 8924C - Triggering CDMA Measurements in Remote Mode (HP-IB Operation)

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Chapter 3, Operating Overview
Triggering CDMA Measurements In Remote Mode (HP-IB Operation)
Triggering CDMA Measurements In Remote Mode (HP-IB Operation)
1. Select the desired trigger mode.
• 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.
NOTE: Since the default trigger mode for remote operation is Repetitive, as soon as the Test Set is put
into remote mode (a local-to-remote transition) the Test Set will begin to make measurements
whether a signal is present or not. If no signal is present, then signal processing error messages
will be displayed on the CRT of the Test Set.
• Single - Once a measurement cycle has completed the Test Set requires an HP-
IB 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.
NOTE: CDMA measurements are not affected by the trigger mode settling parameter. CDMA
measurements are made with a digital signal processor (DSP) which does not require the
settling times associated with analog hardware circuitry.
HP-IB Syntax
"TRIG:MODE:RETR REP" !selects Repetitive retriggering mode.
"TRIG:MODE:RETR SING" !selects Single retriggering mode.