Technical data

Troubleshooting Guide 5
N1911A/1912A P-Series Power Meters Service Guide 55
Performance Test
Type of Failures Debug Tips Possible Faults
1 mW power reference level
failures
Attempt to adjust the 1 mW
power reference level
Calibrator assembly (high
probability)
Main board (low probability)
VSWR failures Not applicable Calibrator assembly
Time base frequency accuracy
failures
Check that the BNC cable being
used is not damaged
Check that the BNC is connected
to ‘Trig Out’, not ‘Trig In’
Main board
Zero set (average Path) failures Not applicable Main board
Zero set (peak path) failures Not applicable Main board
Linearity (average path) failures Not applicable Main board
Linearity (peak path) failures Replace the DAP assembly for
the channel to see if this clears
the fault
DAP assembly (low probability)
main board (high probability)
Rise/fall time (peak path)
failures
Check/reseat the sensor flex RF
connections
Sensor flex assembly (low
probability)
DAP assembly (low probability)
Main board (high probability)