Agilent Technologies N8201A Service Manual download pdf (Page 53)

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Amplitude / Y Scale 2

Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 53

Presel Adjust

Allows you to manually adjust the preselector filter center frequency to optimize its

response on the signal of interest. This function is not available in frequency band 0. It is for

signals ≥2.85 GHz in band 1 and higher. It is not available if the preselector is turned off. The

key also accesses the menu to choose the desired preselector.

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.

The adjustment is preselector specific and the N8201A stores a value for each preselector.

The key readout shows which preselector will be adjusted when the key is pressed. The

choices are [3-26 GHz] and [External]. After performing a Presel Center, the value that is

shown on the Presel Adjust key is the offset from nominal of the affected preselector’s

frequency.

With Presel Adjust selected, press the key again to access the preselector selection menu

to select the preselector you wish to adjust. Some instrument settings will force a

preselector selection. The following flowchart shows the conditions that cause the

preselector selection to change:

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 621 622

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Agilent Technologies N8201A Service Manual Page 53

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