High-speed Multifunction Boards
User Manual, Ver. 1.0, May 2015, PMH-029-10 Page 56
7
Calibration
7.1
Introduction
When shipped from the factory, the PCIe-8620/8622 Series board is already fully calibrated,
including the calibration coefficients that are stored in the onboard Flash. For a more precise
application of voltages in the field, the procedure described below provides a method that allows
the board installed in a specific system to be calibrated so that the correct voltages can be achieved
for the field connection. This calibration allows the effects of voltage drops caused by IR loss in the
cable and/or the connector to be eliminated.
At first the user has to prepare the equipment for calibration: the precise multi-meter. Note that the
calibrated values for Analog Output/Input channels are stored within 3 words in the address of the
Flash, as show in. The calibration procedure will be demonstrated below:
The Analog Input channel calibration values stored in the Flash are as follows:
Flash Address
A/D Calibration Channel Number
0
1
2
3
4
5
6
7
Bipolar 10 V
10 V Ref
0
4
8
12
16
20
24
28
0 V
1
5
9
13
17
21
25
29
Bipolar 5 V
5 V Ref
2
6
10
14
18
22
26
30
0 V
3
7
11
15
19
23
27
31
Flash Address
A/D Calibration Channel Number
8
9
10
11
12
13
14
15
Bipolar 10 V
10 V Ref
32
36
40
44
48
52
56
60
0 V
33
37
41
45
49
53
57
61
Bipolar 5 V
5 V Ref
34
38
42
46
50
54
58
62
0 V
35
39
43
47
51
55
59
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