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Using the Instrument
Setting Up Measurements
Indicating an Update is Needed
This feature alerts you to take a sweep after changing any sweep related
parameters when the analyzer is not in sweep mode. For example, if you
change the resolution bandwidth, the new resolution bandwidth is displayed
on the bottom of the screen, but the trace data displayed on the screen used
the previous resolution bandwidth value.
Changing the following sweep parameters will set the Update Needed Indica-
tor to on:
• start wavelength
• stop wavelength
• sensitivity auto/manual
• auto range enable/disable
• sensitivity
• video bandwidth auto/manual
• resolution bandwidth
• video bandwidth
• gated sweep enable/disable
• sweep continuous/single
• sweep time auto/manual
• sweep time
• sweep trace length
• reference level
• dB per division
• reference level position
• Y scale linear/log mode
• amplitude correction enable/disable
• current active ampcorr correction set
• ampcor interpolation method
• vacuum or air
• wavelength offset
• number of averages for trace averaging
The Update Needed Indicator, “*’”, is displayed in the upper right hand corner
of the graticule. After a sweep is taken, the Update Needed Indicator will be
set to off.