Chapter 2 173
Making Adjustments
28. Correcting for Absolute Amplitude Accuracy for Option 051
7. Enter the Corrected Flatness ERROR from Table 2-26 or Table 2-27
for the frequency displayed using the DATA keys. Terminate the
entry with the
+dBm.
After the new data is entered, the analyzer will automatically jump
to the next frequency correction point. Enter the next Corrected
Flatness ERROR from the table.
To confirm the entries, press ⇓ (step down key) to the frequency of
interest. Re-check the displayed error against the Corrected
Flatness ERROR from column 3.
8. Press
More, EXIT after all corrections are complete.
Frequency Range 1429 MHz to 1501 MHz
9. Looking at Table 2-22, 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
1429 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.
Average Error__________________dB
CAUTION The next step disables the protection for the factory correction
constants.
10.Press the following analyzer keys.
PRESET (wait for completion)
FREQUENCY, −2001, Hz
CAL, More 1 of 4, More 2 of 4
Service Cal
Flatness Data
EDIT FLATNESS
11.Press ⇑ (step up key) until the ERROR readout for 1.380 GHz is
displayed (1.410 GHz for an 8591E spectrum analyzer or an 8591C
cable TV analyzer).
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