Maintenance 9
Agilent N1913A/1914A EPM Series Power Meters User’s Guide 195
and measured internally. A pass or fail result is returned.
Fan
This test confirms that the internal cooling fan is operating.
Real Time Clock (RTC) Battery
The RTC battery provides power for the real time clock circuitry on the
motherboard when the power meter is powered off. The real time clock is
used to provide the timestamp needed for N8480 Series power sensors’
aging sense data.
During RTC battery test, the RTC battery power level is determined by
converting the ADC value of the RTC battery power level read from the
FPGA, to voltage level. If the battery power level is less than a
pre- specified threshold (threshold to be defined later), the test will fail.
An error will be logged in the error list if the test fails.
Channel CW Path
A brief test on CW meter linearity performance.
Ensure that all power sensors have been disconnected from the meter before performing
self-test.
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