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Chapter 2 43
Operation
Using the Mixers with MMS Analyzers
Operation
Conversion Loss Versus Frequency Correction
The Agilent 71000 Series Spectrum Analyzers with the Agilent 70907A (or B) External
Mixer Interface Module installed has the amplitude-correction function (AMPCOR)
available by remote programming.
Use AMPCOR to compensate for the Agilent 11970 Series 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 value are interpolated. When the measuring at frequencies
outside of the first and last correction pairs from memory.
When AMPCOR is executed, the frequency pairs are stored in internal memory. The
remote commands DISPOSE ALL, FORMAT, ERASE, and DISPOSE AMP COR erase the
amplitude-correction pairs from memory.
NOTE DISPOSE ALL, FORMAT, and ERASE erases much more than the
amplitude-correction pairs from memory. Do not use these commands without
referring to the programmer’s manual for the Agilent 70000 and Agilent
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 (also at a frequency that is corrected
by the AMPCOR command).
To use AMPCOR for the Agilent 11970 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
Agilent 11970V.
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).