208 Chapter3
Backing Up and Reloading Correction Constants
Reloading the Correction Constants
Reload the A12 step-gain-correction constants
1. Reload the A12 step-gain-correction constants by pressing the
following keys.
PRESET
FREQUENCY, −2001, Hz
CAL, More 1 of 4, More 2 of 4
Service Cal, SET ATTN ERROR
REF LVL OFFSET is displayed in the active-function block above the
prompt ENTER CAL ATTEN ERROR 1.
2. At the prompt, enter the five step-attenuator correction constants
(resolution to 0.01 dB) listed in the Correction Constant
Backup-Data Record, then terminate each entry with either
+dBm of
−dBm, as appropriate. Typically 1 and 2 dB step errors are negative.
The 4 and 8 dB steps are positive. The 16 dB step is always 0 dB.
Each entry is displayed to the left of the graticule as an amplitude
offset, but only with 0.1 dB resolution. A PRESET occurs after the
16 dB step-attenuator error is entered.
Reload the differential phase calibration constant
This step is for instruments equipped with Option 107 only.
1. Install 85721A Cable TV Measurements Personality.
Refer to your cable TV measurements user's guide for the procedure
to load this personality.
Press
FREQUENCY
Enter −2001, Hz
Press CAL, More 1 of 4, More 2 of 4
Press Service Cal, Flatness Data
Press Store DP CAL
Enter −7373, Hz
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