Agilent Technologies 89410A Service Manual page 25

Troubleshooting the Analyzer
Logic levels in this chapter are either TTL level high or TTL level low
unless stated otherwise. Toggling signal levels continually change
from one TTL level to the other.
Configure a logic probe with an external bias supply for testing digital
signals. This analyzer does not have easily accessible +5 V supplies.
If you abort a self test before the self test is finished, the analyzer may
fail its calibration routine. To prevent this from happening press
[ ] or cycle power after you abort the self test.
Preset
The troubleshooting tests in this chapter assume only one
independent failure. Multiple failures can cause false results.
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