Agilent Technologies HP 70910A Podręcznik Użytkownika Pobierz pdf (Strona 69)

Chapter 3 69

Operation

Using an 71000 Series Spectrum Analyzer with an 70907B, 70909A, or 70910A

Operation

Conversion Loss Versus Frequency Correction

The 71000 Series Spectrum Analyzers with the 70907B External Mixer Interface Module

installed has the amplitude-correction function (AMPCOR) available by remote

programming.

Use AMPCOR to compensate for the 11974 frequency-dependent conversion-loss

variations. Up to 200 pairs of frequency-amplitude correction points can be entered,

depending on the amount of available internal memory. The frequency values entered

must be in increasing order, or an error condition results. Whenever AMPCOR is on, the

correction values are added to all measurement results.

The values of the correction points are applied across the active measurement range.

Between points, the correction values are interpolated. When measuring at frequencies

outside the first and last correction points, these values are used as the correction value.

When AMPCOR is executed, the frequency pairs are stored in internal memory. The

remote commands DISPOSE ALL, FORMAT, PERASE, and DISPOSE AMP COR erase the

amplitude-correction pairs from memory.

NOTE DISPOSE ALL, FORMAT, and PERASE erases much more then the

amplitude-correction pairs from memory. Do not use these commands without

referring to the programmer’s manual for the 70000 and 70900B to determine

their effect on instrument programming.

Because AMPCOR adjusts IF gain and attenuation, AMPCOR should be used with care

when measuring signals near the compression level that are also at a frequency that is

corrected by the AMPCOR command.

To use AMPCOR for the 11974 conversion loss correction, first set the single-point

conversion-loss function to zero with the following command:

OUTPUT 718; "CNVLOSS 0DB;"

Then build the AMPCOR table with frequency conversion loss pairs. The following

example program line shows three pairs of frequency conversion-loss values for a typical

11974V.

OUTPUT 718; "AMPCOR 50GHZ, 49.6DB, 51GHZ, 49.1DB, 52GHZ,48.6DB;"

The conversion loss corrections are activated by the AMPCOR ON command; use AMPCOR OFF

to deactivate the function. (Be sure to manually enter a single-point conversion-loss value

if AMPCOR has been used.)

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Agilent Technologies HP 70910A Podręcznik Użytkownika Strona 69