HP (Hewlett-Packard) 86140A TV Cables User Manual


 
3-17
Using the Optical Spectrum Analyzer
The Bandwidth/Sweep Menus
Manually setting the sweep time turns coupling off.
To turn repeat sweep on and off
1
Press the front-panel
Bandwidth/Sweep
key.
2
Press the
Repeat Sweep
softkey to toggle this function
ON
or
OFF
.
To perform a single sweep
1
Press the front-panel
Bandwidth/Sweep
key.
2
Press the
Single Sweep
softkey. The instrument will perform a single sweep and
then stop.
When first turned on, the optical spectrum analyzer uses free run triggering
with continuous sweeps. Free run triggering ensures evenly timed sweeps for
a stable display of the current tuning range. Sweeps continuously repeat as
long as trigger conditions are met. The
SWEEP
indicator light on the front panel
of the optical spectrum analyzer is on when the sweep is in progress. The indi-
cator is off between sweeps.
Note
If the sweep time is set too fast, an
OVER
SWEEP
message appears indicating the dis-
play is no longer calibrated and that trace data may not meet specifications. Increase
the sweep time until the
OVER
SWEEP
message disappears. If the sweep time is set too
slow, measurement times may be excessively long.
Note
Single sweep mode is especially useful when programming the instrument. Use single
sweeps for the following reasons:
Insure trace reflects current measurement range settings
Capture traces before processing them with math commands
Capture traces before positioning markers
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