Correcting For Absolute Amplitude Accuracy For Option 051 - Agilent Technologies 8590 Series Service Manual

28. Correcting for Absolute Amplitude
Accuracy for Option 051
This adjustment applies to:
The frequency response of the analyzer is adjusted to optimize the
amplitude accuracy for the frequency range 810 MHz to 956 MHz and
1429 MHz to 1501 MHz. The amplitude error from "Checking the
Absolute Amplitude Accuracy for Option 051" is used to determine how
much flatness correction is necessary. Normally, only a small amount of
adjustment is needed to bring the absolute amplitude accuracy
of 8590 E-Series spectrum analyzer equipped with an Option 051 into
specification.
Frequency Range 810 MHz to 956 MHz
1. Looking at
The next step disables the protection for the factory correction
CAUTION
constants.
2. Press the following analyzer keys.
Chapter 2

28. Correcting for Absolute Amplitude Accuracy for Option 051

All 8590 E-Series spectrum analyzers, Option 051
Table 2-18, Frequency Response Attenuator 10 dB,
calculate the error from the nominal value of −9 dB for each
frequency. For example, if the measuring receiver reading at
810 MHz is −9.2 dB, then the error is −0.2 dB. Find the average error
by adding the four errors for each frequency and then dividing the
sum by four.
Note that if the average error is greater than 0.5 dB, there may be a
hardware problem. Typically, front-end component problems are
responsible for large amplitude errors. A defective First Mixer or a
poor cable connection may cause a power hole near the analyzer
Option 051 frequency band. In this case, performing a frequency
response check will uncover this type of problem. Perform a
functional check of the input attenuator if the errors for some
attenuation settings are larger than others.
, −2001,
FREQUENCY
, ,
CAL More 1 of 4 More 2 of 4
Service Cal
Flatness Data
EDIT FLATNESS
Average Error____________________dB
Hz
Making Adjustments
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