To Troubleshoot Input And Adc Failures - Agilent Technologies 35670A Service Manual

Agilent 35670A

To troubleshoot input and ADC failures

Use this test to isolate input failures in two channel analyzers to the A1 Input
assembly, A5 Analog assembly, or A12 BNC assembly.
Step 1. Check the input path.
G
• Set the frequency synthesizer as follows:
Frequency
Amplitude
Function
• Set the oscilloscope as follows:
CH1 V/div
Input Impedance
CH1 coupling
Time/div
Probe Atten
• Press the following keys:
[
System Utility
[
CALIBRATN
[
AUTO CAL
[ ]
Input
[
ALL CHANNELS
[
CH* FIXED RANGE
1
[ ]
Vpk
• Connect the frequency synthesizer to the failing channel's input connector
using a BNC cable.
• Using the oscilloscope, BNC-to-SMB cable, and SMB-to-SMB adapter,
check the following signals for the failing channel:
Test Location
Channel 1
A12 P31 (connected to A1 P100)
A1 P200
Channel 2
A12 P41 (connected to A1 P600)
A1 P700
10 kHz
2 Vp-p
Sine Wave
400 mV/div
1 MΩ
dc
20 ns/div
1
]
]
OFF ]
]
]
Amplitude ( 10%)
2 Vp-p
2.83 Vp-p
2 Vp-p
2.83 Vp-p
Troubleshooting the Analyzer
To troubleshoot input and ADC failures
Probable Faulty
Assembly
A12 BNC
A1 Input
A12 BNC
A1 Input
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