Instrument Self-Test - Keysight N1913B EPM Series Service Manual

Instrument Self-Test

Instrument
Test point voltages
Calibrator
Fan
RTC battery
CW path/ChA CW path Verifies that the average path of
ChB CW path
Keysight N1913B/N1914B EPM Series Power Meters Service Guide
Purpose
Checks that all of the supply voltages
are present
Verifies that the calibrator is working
(Note: This test does not check that
the calibrator meets its
specifications)
Verifies that the fan is working
Checks that the lithium manganese
battery on the main board is working
channel A is working
(Note: This does not prove that the
average path meets its
specifications)
Verifies that the average path of
channel B is working
(Note: This does not prove that the
average path meets its
specifications)
Debug tips
Replace the PSU to see if this clears
the faults
Check/reseat that cable between the
calibrator assembly and the main
board
Attempt to adjust the 1 mW power
reference level
Check/reseat the cable between the
fan assembly and the main board
Check visually if the fan is functioning
Replace the battery to see if this
clears the fault
Not applicable
Not applicable
Troubleshooting Guide
Possible faults
PSU (low probability)
Main board (high
probability)
Calibrator assembly
(high probability)
Main board (low
probability)
Fan assembly (high
probability)
Main board (low
probability)
Lithium manganese
battery (high
probability)
Main board (low
probability)
Main board
Main board
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