Technical data

5 Troubleshooting Guide
52 N1911A/1912A P-Series Power Meters Service Guide
Instrument Self-Test
Instrument Purpose Debug Tips Possible Faults
Test point voltages Checks that all of the supply
voltages are present
Replace the PSU to see if this
clears the faults
PSU (low probability)
Main board (high probability)
Calibrator Verifies that the calibrator is
working
(Note: This test does not
check that the calibrator
meets its specifications)
Check/reseat that cable
between the Calibrator
Assembly and the Main Board
Attempt to adjust the 1 mW
Power Reference Level
Calibrator assembly (high
probability)
Main board (low probability)
Fan Verifies that the fan is
working
Check/reseat the cable
between the Fan Assembly
and the Main Board
Check visually to see whether
or not the Fan is working
Fan assembly (high
probability)
Main Board (low probability)
Battery Checks that the lithium
manganese battery on the
main board is working
Replace the battery to see if
this clears the fault
(Note: It is recommended for
the battery to be replaced at
the Keysight service center
every five years)
Lithium manganese battery
(high probability)
Main board (low
probability)
Peak path/ChA peak path Verifies that the peak path of
channel A is working
(Note: This does not prove
that the peak path meets its
specifications)
Replace the DAP Assembly
for Channel A to see if this
clears the fault
DAP assembly, channel A
(low probability)
Main board (low probability)
CW path/ChA CW path Verifies that the average
path of channel A is
working (Note: This does
not prove that the average
path meets its
specifications)
Not applicable Main board
DAP check/ChA DAP pheck Executes an internal self-test
procedure on the DAP
Assembly for channel A
Replace the DAP assembly for
channel A to see if this clears
the fault
DAP assembly, channel A
(high probability)
Main board (low probability)