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Chapter 3, Operating Overview
Measurement Triggering Process
Triggering A Measurement Cycle
The Test Set starts a measurement cycle when a valid trigger is received. The
measurement cycle is the process used by the Test Set to obtain measurement
results.
The measurement cycle is a firmware process which, for all active measurements,
obtains raw data from the hardware and then processes/formats the raw data into a
measurement result. The result is then displayed on the screen, and - if operating
in remote mode - sent to the GPIB bus.
The measurement cycle completes when a valid measurement result is obtained
for all active measurements.
Trigger Modes
The trigger mode used to start the measurement cycle can be selected by the user.
The trigger mode is defined by two parameters: retriggering and settling.
Retriggering
Retriggering refers to what the measurement cycle does once it has completed
(obtained a valid measurement result for all active measurements). There are two
options:
1. Single retriggering causes the measurement cycle to stop once a valid measurement re-
2. Repetitive retriggering causes the measurement cycle to automatically start over once
NOTE:
The Cont selection in the Meas Cntl field is equal to repetitive retriggering.
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sult has been obtained for all active measurements. A valid trigger must be received to
start the measurement cycle again. When a measurement cycle is completed, the values
for all active measurements are held until another trigger is received.
a valid measurement result has been obtained for all active measurements. No trigger
must be received to start the measurement cycle again. Repetitive retriggering will
cause measurements that rely on external signals or hardware generated events (such as
Traffic Rho) to be automatically re-armed upon completion of a measurement cycle.
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