SCXI-1120/D Calibration Procedure
8
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The order of the settings for the first- and second-stage gain does not
matter as long as the first-stage gain multiplied by the second-stage
gain—multiplied by 0.5 when using the SCXI-1120D—equals the desired
final gain value.
•
SCXI-1120—To determine the overall gain of a given channel on the
SCXI-1120 module:
•
SCXI-1120D—To determine the overall gain of a given channel on the
SCXI-1120D module:
Configuring the Filter Jumpers
Each input channel also has two user-configurable filter stages.
The SCXI-1120 module ships in the 4 Hz position and the SCXI-1120/D
module ships in the 4.5 kHz position. Refer to Table 3 or 4 to find the
correct jumper setting for the desired cutoff frequency. Figure 3 shows the
locations of the jumper blocks on the SCXI-1120/D modules. Verify that
both filter stages are set to the same filter setting to ensure that you achieve
the required bandwidth.
Table 3.
SCXI-1120 Filter Jumper Settings
Input
Channel
Number
First Filter Jumper
Second Filter Jumper
4 Hz
(Factory
Setting)
10 kHz
4 Hz
(Factory
Setting)
10 kHz
0
W17-A
W17-B
W25
W26
1
W18-A
W18-B
W27
W28
2
W19-A
W19-B
W29
W30
3
W20-A
W20-B
W31
W32
4
W21-A
W21-B
W33
W34
5
W22-A
W22-B
W35
W36
6
W23-A
W23-B
W37
W38
7
W24-A
W24-B
W39
W40
First-Stage Gain
Second-Stage Gain
×
Overall Gain
=
First-Stage Gain
Second-Stage Gain
×
(
)
0.5
×
Overall Gain
=
