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(
OOC4 (hex)
0000 0000 1100 0100
(binary)
Test Failure
I
I
Bit2: 16
L...==
Bit6:14
' - - - - - - - - Bit 7: 17
Figure 4-2. Diagnostics Test Results
If
the test fails, a fault is likely in one or more of the following areas:
•
Digital to Analog Converter
•
Sample-and-hold Farm(s)
•
Self-test ACVS readback circuitry
•
CPU to M382 Interconnection
•
M382 to
DI
A
I
Sample-and-hold Farm Interconnection
•
Shorted ACVS output
Calconstant Diagnostics
Dia nostics
7391-402
Each amplifier contains a large number of calconstant diagnostic routines that verify the accuracy of the last
amplifier calibration cycle. These tests do not test specific hardware. Instead, they examine the calibration
constants generated by the last calibration cycle, and apply mathematical models of an ideal amplifier signal
path to these calconstants to determine theoretically
if
the various operating parameters of the amplifier
signal path are such that the oscilloscope can accurately attain all its settings. These tests are strictly numeric
in nature, meaning that repeated (looping) execution of these tests is impractical.
11A52 Extended Service Manual
4-11
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Troubleshooting
