Agilent Technologies 89410A Service Guide

1-72
Troubleshooting the Analyzer
To troubleshoot input and ADC failures
failing range, impedance, and frequency. Input a full scale signal.
If the input level equals the range level, A10 J2 and A10 J3 should
match the amplitudes in the above table.
2 Check the dc offset DAC.
a Connect the oscilloscope to A10 J2 using the BNC(m)-to-SMB(f)
cable.
b Press the following keys:
[System Utility]
[
more]
[
diagnostics]
[
service functions]
1125
[
enter]
[
special test modes]
[
input]
[
Marker/Entry]
c Rotate the RPG knob while monitoring the oscilloscope. The sine
wave dc offset value should change from +0.4 V to -0.4 V as the
RPG knob is turned.
To keep the sine wave displayed, adjust the oscilloscope’s trigger
level while varying the dc offset value.
d If the dc offset function is incorrect, the A10 Analog Input
assembly is probably faulty.
e Reconnect A10 J2 cable to A21 J4.
3 Check the trigger offset DAC.
a Connect the oscilloscope to A10 J3 using the BNC(m)-to-SMB(f)
cable.
b Press the following keys:
[dc offset]
2000
[
enter]
[
trig offset]
c Rotate the RPG knob while monitoring the oscilloscope. The sine
wave dc offset value should change from +0.4 V to -0.4 V as the
RPG knob is turned.

Agilent Technologies 89410A Specifications

General

Brand	Agilent Technologies
Model	89410A
Category	Measuring Instruments
Language	English