Agilent Technologies 89410A Service Manual page 86

Troubleshooting the Analyzer
To troubleshoot source and calibrator out failures
6
Step 6. Check the source attenuation.
a
Connect a digital multimeter to the SOURCE output using a 50
feedthrough termination and BNC cable.
b
Press the following keys:
[CW (fixed sine) ]
[ Return ]
[ ]
sine freq
1
[ ]
kHz
[ level ]
5
[ ]
V
[ ]
System Utility
[ ]
more
[ ]
diagnostics
[ service functions
[ special test modes
[ ]
source
[ ]
Marker/Entry
c
Slowly rotate the RPG knob while monitoring the digital
multimeter. The sine wave's amplitude should vary as follows.
Source
Attenuation
0
1
2
3
4
5
6
7
d
If all the values are incorrect, go to Step 7.
e If only a few of the values are incorrect, the A35 Analog Source is
probably faulty.
f
If all the values are correct, the analog source and calibrator are
operating correctly. For a single channel analyzer, go to
page 1-71, ''To troubleshoot input and ADC failures.'' For a two
1-68
]
]
Source Amplitude (nominal)
dBm Vp-p
24 10.0
14 3.17
4 1.00
−6
317 m
−16
100 m
−26
31.7 m
−36
10.0 m
−46
3.17 m
Ω
Vrms
3.54
1.12
354 m
112 m
35.4 m
11.2 m
3.54 m
1.12 m