202 Chapter3
Backing Up and Reloading Correction Constants
Backing Up Analyzer Correction Constants
Retrieve the timebase and flatness-correction
constants
1. Make a copy of the Correction Constant Backup-Data Record at the
end of this chapter.
2. Record the date and instrument serial number.
Skip Step 3 and Step 4 if your instrument is equipped with a
precision frequency reference or if testing an 8590L with Option 713.
3. Press the following keys.
PRESET
FREQUENCY, −37, Hz
CAL, More 1 of 4, More 2 of 4
4. Press VERIFY TIMEBASE, then record the number that is displayed in
the active-function block in Table 3-2.
5. Press the following keys.
SERVICE CAL, FLATNESS DATA, EDIT FLATNESS
6. The signal trace represents the frequency-response (flatness)
correction-constant data. The active-function block displays the
frequency response error.
7. Record the frequency-response error in the appropriate table for
your analyzer.Table 3-3 is for the 8590L and 8591E spectrum
analyzers and 8591C cable TV analyzers. Table 3-5 through Table
3-12 are for all other 8590 E-Series and L-Series spectrum
analyzers.
8. Press
⇑, then record the next frequency-response error in the
appropriate table.
9. Repeat the previous step until all frequency-response errors are
recorded. Use
⇓ to view previous data points.
10.Press
EXIT when all frequency-response errors have been recorded.
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