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Self-Test Error
Definitions
92 Digitizer Command Reference
test_number
90*
Channel 4: 64V uncalibrated gain
91*
Channel 1: 256V uncalibrated gain
92*
Channel 2: 256V uncalibrated gain
93*
Channel 3: 256V uncalibrated gain
94*
Channel 4: 256V uncalibrated gain
* These tests require the HP E1564A 4-Channel Digitizer.
A failed self-test will return a number other than zero. The binary value of that
number defines the failure mode. More than one failure mode may result from one
self-test. The failure modes are defined in the following sections for each type of
The bits and their weighting are shown below.
self-test.
bit #
7
weight
128
Offset Noise Test (self-test numbers 3 - 58)
BCD weight
1
Span is zero
2
Span is too large
4
Mean is too low
8
Mean is too high
16
Standard deviation is too large
Offset DAC Test (self-test numbers 59-62)
(HP E1564A 4-Channel Digitizer)
BCD weight
1
DAC measurement is noisy
2
Measured data span is too small
4
Lower end point to upper end point span is too small
8
Lower end point to upper end point span is too large
16
Offset DAC span does not include 0
32
Bit weight is out of limits; the offending bit is in B15-B8.
Description
6
5
4
64
32
16
Failure mode
Failure mode
3
2
1
8
4
2
0
1
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