Agilent Technologies 35670-90066 manual Check the Input assembly

Troubleshooting the Analyzer	Agilent 35670A
To troubleshoot source and calibrator failures

❑Step 5. Check the Input assembly.

•Using an oscilloscope and a 10:1 probe, check the following signal.

Oscilloscope Setup		Parameters	Waveform
Connect CH1 to A1/A2 TP 300		Amplitude
CH1 V/div	200 mV/div	Time
		Distortion
Input	1 M Ω
Impedance	dc
CH1 Coupling	10
Probe Atten	Repetitive
Display Mode	8
Averaging	20 ms/div
Time/div	Trg’d Sweep
Trigger	Chan1		Channel 1 Output
Trig Src

•If the signal is incorrect, the A1/A2 Input assembly is probably faulty.

❑Step 6. Compare the analyzer’s self-test results to the following table.

•Press the following keys:

[System Utility ] [ MORE ]

[ SELF TEST ]

[ FUNCTIONL TESTS ]

[ DIGITAL PROCESSOR ] [ ALL ]

[ Rtn ]

[ADC GATE ARRAY ]

•Determine the probable faulty assembly by comparing the analyzer’s self-test results to the following table.

Self-Test Results	Probable Faulty Assembly
Trigger Gate Array fails and ADC Gate Array passes	A6	Digital
Baseband fails, Zoom fails, and ADC Gate Array passes	A6	Digital
ADC Gate Array fails	A5	Analog
All self tests pass through the ADC Gate Array	A5	Analog

This test does not check all the signals from the A6 Digital assembly to the A5 Analog and A1/A2 Input assemblies. All the functions of the A6 Digital assembly are checked by the self tests except for a few output buffers. If replacing the A5 Analog assembly does not fix the failure, the A6 Digital assembly is probably faulty.

4-50