Chapter 2
Configuration and Installation
©
National Instruments Corporation
2-27
Figure 2-9.
Nulling Circuit
Using the SCXI-1321 with RTDs and Thermistors
When using this terminal block with RTDs or thermistor-type transducers
and with the SCXI-1121 excitation set in the Current mode, you must
disable the nulling circuit of the channel of interest. You can do this in
two steps:
1.
Place the enable/disable jumper in position D (disable) as shown in
Table 2-12.
2.
Remove the nulling resistor from its sockets.
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
Trimmer
Potentiometer
EX+
R
d
R
g
R
null
CH+
EX–
SCXI-1321
R
R
CH–
•
•
D
E
•
•
D
E
•
•
D
E
•
•
D
E