Filter
Top Products
869
AMPTD Y Scale
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
Dependencies: • Grayed out if the microwave preselector is off. )
• If the selected marker’s frequency is below Band 1, advisory message
0.5001 is generated and no action is taken.
• Grayed out if entirely in Band 0.
• Blank in models that do not include a preselector, such as option 503. If
the SCPI is sent in these instruments, it is accepted without error, and the
query always returns 0.
• Grayed out in the Spectrogram View.
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