Performing The Ytf Self-Calibration Routine; When Is Self-Calibration Needed - HP 84125A User Manual

Performing the YTF self-calibration routine

When is self-calibration needed?

6-8 Making Measurements
The YTF self-calibration routine should be performed periodically.
Refer to \When Is Self-Calibration Needed?" in the following section
for some helpful guidelines on how often the self-calibration routines
should be performed.
1. Connect a low-loss cable (such as HP part number 8120-5148) from
100 MHz COMB OUT to the EMC analyzer input.
2. To calibrate, press:
4 5
CAL
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More 1 of 4
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More 2 of 4
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More 3 of 4
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CAL YTF
The YTF self-calibration routine completes in approximately
7 minutes.
3. To save the calibration factors in memory, press:
4 5
CAL
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CAL STORE
4. To return to normal operation, press:
4 5
PRESET
5. To reinstall the cable harness assembly to the EMC analyzer, refer
to \Connecting the RF Cable Assembly to the EMC Analyzer" in
Chapter 3.
While it is dicult to provide general advice for your speci c
measurement needs, the following suggestions may help you decide
when to use the self-calibration features:
1. Perform the frequency and amplitude self-calibration routines
whenever the instrument experiences signi cant environmental
changes such as temperature (
(such as may occur during shipping or transport). This is especially
important if the frequency and amplitude self-calibration routines
were performed the last time in a di erent environment.
2. If the environment is relatively stable (for example, a lab
environment), use
turned o overnight, the EMC analyzer will need to warm up, but
should not require self-calibration.
6
5  C), humidity, shock, or vibration
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CAL FREQ & AMPTD monthly. After being