3
Troubleshooting Guide
66
Keysight 8990B Service Guide
Performance Verification
Channel 4 memory interface
test
Ensures that the memory
interface of channel 4 is
working
Replace the DAP board
– DAP assembly (high
probability)
– Main board (low probability)
Video channels
Ensures the functionality of
the video channels
–
Scope acquisition board
Table 3-2
Instrument self-test troubleshooting (continued)
Self-test
Purpose
Debug tip
Possible faults
Table 3-3
Performance verification troubleshooting
Type of failure
Debug tip
Possible faults
Zero set failure
–
Main board
System accuracy failure
Replace the DAP board
– DAP assembly (high probability)
– Main board (low probability)
Rise/fall time failure
Unplug and plug back the sensor flex RF
connections
– Main board (high probability)
– Sensor flex (low probability)
– DAP assembly (low probability)
Time base frequency accuracy failure
– Check that the BNC cable used is not
damaged
– Check that the BNC cable is connected
to the
Trig Out
and not to
Trig In
Main board
Impedance failure
–
Scope acquisition board
Offset accuracy failure
–
Scope acquisition board
DC gain failure
–
Scope acquisition board
Analog bandwidth check failure
–
Scope acquisition board
Time scale accuracy failure
–
Scope acquisition board
Содержание 8990B
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