11 APD Measurement
AMPTD Y Scale
pressed, the analyzer will turn on the selected marker, perform a peak search, and then perform centering
on the marker’s center frequency. If the selected marker is already on and between the start and stop
frequencies of the analyzer, the analyzer performs the preselector calibration on that marker’s frequency.
If the selected marker is already on, but outside the frequency range between Start Freq and Stop Freq,
the analyzer will first perform a peak search, and then perform centering on the marker’s center frequency.
The value displayed on the Presel Adjust key will change to reflect the new preselector tuning (see
PreselAdjust.
A number of considerations should be observed to ensure proper operation. See "Proper Preselector
Operation" on page 898.
Key Path
AMPTD Y Scale
Remote Command
[:SENSe]:POWer[:RF]:PCENter
Example POW:PCEN
Notes Note that the rules outlined above under the key description apply for the remote command as well
as the key. The result of the command is dependent on marker position, and so forth. Any message
shown by the key press is also shown in response to the remote command.
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
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
898 EMI Receiver Mode Reference
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