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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 Indicator 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.
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