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Improving
Accuracy
with
Self-Calibration
Routines
Data from the self-calibration routine is necessary for cable TV analyzer
operation. Executing the self-calibration routine regularly ensures that the
cable TV analyzer is using current calibration data that improves the cable
TV analyzer frequency and amplitude accuracy. Press the
ICAL)
key to view
the self-calibration routine menus. The last softkey on this menu, labeled
More 1 of 4 , provides access to additional self-calibration functions. For
more detailed information on the self-calibration softkeys, refer to Chapter 6.
The self-calibration routines add correction factors to internal circuitry. The
addition of the correction factors is required to meet frequency and amplitude
specifications.
When the correction factors are added to internal circuitry, CORR (corrected)
appears on the left side of the screen.
Warm-Up
Time
In order for the cable TV analyzer to meet its specifications, allow the
cable TV analyzer to warm up for 30 minutes after being turned on before
attempting to make any calibrated measurements. Be sure to calibrate the
cable TV analyzer only
after
it has met operating temperature conditions.
The cable TV analyzer frequency and amplitude self-calibration routines are
initiated by the CAL
FREQ
8t
AMPTD softkey in the menu located under the
(CAL) key.
1. To calibrate the instrument, connect the cable TV analyzer CAL OUT to
the INPUT 75
61
connector with an appropriate cable.
NOTE
A low-loss cable should be used for accurate calibration. Use the 75
Cl
cable shipped with the cable
TV analyzer.
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