Chapter 2 Configuration and Installation
SCXI-1121 User Manual 2-28 www.natinst.com
SCXI-1121 Shunt Calibration
Shunt calibration circuits are independent from each other but are
controlled together. In other words, when SCAL is set to 1 on the
SCXI-1121, all the shunt switches close when SCAL is cleared to 0, all the
switches open. At startup or reset, all switches are open. This shunt
calibration circuitry configuration places a shunting resistor in parallel with
the strain gauge as shown in Figure2-10.
Table 2-12. Jumper Settings of the Nulling Circuits
Jumper Position Description
W1
Nulling circuit of Channel 0 is enabled;
factory setting
Nulling circuit of Channel 0 is disabled
W2
Nulling circuit of Channel 1 is enabled;
factory setting
Nulling circuit of Channel 1 is disabled
W3
Nulling circuit of Channel 2 is enabled;
factory setting
Nulling circuit of Channel 2 is disabled
W4
Nulling circuit of Channel 3 is enabled;
factory setting
Nulling circuit of Channel 3 is disabled
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•
D
E
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•
D
E
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•
D
E
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•
D
E
•
•
D
E
•
•
D
E
•
•
D
E
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•
D
E