Specifications

Frequency Response Adjustment
Agilent Technologies
PSA Series Spectrum Analyzers
Test and Adjustment Software
Frequency Response Adjustment
This adjustment procedure performs the following steps:
The instrument’s internal flatness corrections are turned off.
Amplitude error as a function of frequency from 9 kHz to 26.5 GHz is measured and
normalized to the 50 MHz measurement. Predetermined frequency points are used when
testing from 9 kHz to 50 MHz and 3 GHz to 26.5 GHz. Frequency points tested from 50
MHz to 3 GHz are determined by the Adaptive Flatness procedure. The Adaptive Flatness
procedure gathers a custom list of the most critical frequency points for each instrument.
At each frequency the source amplitude is adjusted to keep the power constant as
measured by a power meter connected to the power splitter.
Special note for E4443A and E4445A instruments: Since these instruments have max
frequency limits that line up near the band breaks of the 26.5 GHz E4440A, it is necessary
to gather a few correction points in the next higher band. This allows the instrument to
tune a center screen signal at the instrument’s specified max frequency and still be able to
sweep 400 MHz past the signal. For example, the 6.7 GHz E4443A will have correction
values gathered from 6.2 GHz to 7.1 GHz in Band 2. This is not only necessary to sweep
past a 6.7 MHz center screen signal, but also, Band 1 ends at 6.6 GHz, not 6.7 GHz.
If the instrument contains Option 1DS, 500 kHz to 3 MHz preamplifier, additional testing
is performed with the preamp turned on.
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