Preselector adjust – Agilent Technologies Signal Analyzer N9030a User Manual
Page 531
6 RLC Swept SA Measurement Front-Panel & SCPI Reference
AMPTD Y Scale
Couplings
The active marker position determines where the centering will be attempted.
If the analyzer s in a measurement such as averaging when centering is initiated, the act of
centering the preselector will restart averaging but the first average trace will not be taken until
the centering is completed.
Status Bits/OPC
dependencies
When centering the preselector, *OPC will not return true until the process is complete and a
subsequent measurement has completed, nor will results be returned to a READ or MEASure
command.
The Measuring bit should remain set while this command is operating and should not go false
until the subsequent sweep/measurement has completed.
Initial S/W Revision
Prior to A.02.00
Modified at S/W
Revision
A.03.00
Proper Preselector Operation
A number of considerations should be observed to ensure proper operation:
1. If the selected marker is off, the analyzer will turn on a marker, perform a peak search, and
adjust the preselector using the selected marker’s frequency. It uses the "highest peak" peak
search method unqualified by threshold or excursion, so that there is no chance of a ‘no peak
found’ error. It continues with that peak, even if it is the peak of just noise. Therefore, for this
operation to work properly, there should be a signal on screen in a preselected range for the
peak search to find.
2. If the selected marker is already on, the analyzer will attempt the centering at that marker’s
frequency. There is no preselector for signals below about 3.6 GHz, therefore if the marker is on
a signal below 3.6 GHz, no centering will be attempted and an advisory message generated
3. In some models, the preselector can be bypassed. If it is bypassed, no centering will be
attempted in that range and a message will be generated.
Preselector Adjust
Allows you to manually adjust the preselector filter frequency to optimize its response to the
signal of interest. This function is only available when
is available.
For general purpose signal analysis, using Presel Center is recommended. Centering the filter
minimizes the impact of long-term preselector drift. Presel Adjust can be used instead to manually
optimize the preselector. One application of manual optimization would be to peak the preselector
response, which both optimizes the signal-to-noise ratio and minimizes amplitude variations due
to small (short-term) preselector drifting.
Remote Language Compatibility Measurement Application Reference
531