Table of Contents
Advertisement
7.10 Over-range and under-range
The over/under-range bit in the header indicates that over-range or under-range occurred at one or
several samples within the record and at any stage in the signal chain. The result of the over-range is
not straightforward to predict, see
Example 6:
Figure 33
digital code where the under-range occurred is not the maximum code.
- .
'
/ 0
/
- .
&
#
DESCRIPTION
a
ADC with offset.
b
Digital offset calibration.
c
Digital baseline stabilizer that dynamically adjust baseline to zero. That is adjust the offset. Under-range has
already occurred prior to this stage.
d
Acquisition create a header which contain over/under-range indication.
e
The analog input signal with offset. The ADC also contribute to the offset.
f
Digital calibration cannot account for offset on the analog signal. Under-range occur when signal is out of
range on the negative side.
g
The DBS fine-tunes the offset, that is add a value to the signal. Then the under-range is not at the minimum
digital code anymore.
h
Overflow indication is set when over/under-range occur and is kept for the record.
Figure 33: Under-range in the ADC calibration.
19-2302 A
2020-09-16
Example
6.
shows under-range in ADC before the Offset calibration. The result is that the
-'.
&
'
-.
- .
"
"
1
- .
ADQ8-4X Manual
19-2302 A 2020-09-16
43(46)
-.
()
*
+
#
,
/ 0
/
-.
43(46)
Advertisement
Table of Contents
