Programming instructions

Chapter 21 Common SCXI Applications
© National Instruments Corporation 21-3 LabVIEW Data Acquisition Basics Manual
In addition, the SCXI-1100, SCXI-1141, and SCXI-1122 offer a way for
you to ground the module amplifier inputs so you can read the amplifier
offset. You can subtract the amplifier offset value to determine the actual
voltages. For more information on temperature sensors and amplifier
offsets, continue on to the following two sections.
Temperature Sensors for
Cold-Junction Compensation
The temperature sensors in the terminal blocks for the analog input
modules can be used for cold-junction compensation. If you are operating
your SCXI modules in multiplexed mode as recommended, you should
leave the cold-junction sensor jumper on the terminal block in the
mtemp
(factory default) position. If you are using parallel mode, you can use the
dtemp
jumper setting.
Note
The SCXI-1102 only uses the cjtemp string in multiplexed mode.
To read the temperature sensor, use the standard SCXI string syntax in the
channels
array with
mtemp
substituted for the channel number, as shown
in the following table.
Channel List Element Channel Specified
ob0!scx!mdy!mtemp
The temperature sensor configured in
mtemp
mode on the multiplexed module
in slot
y
of the chassis with ID
x
.
ob0!scx!mdy!cjtemp
The temperature sensor configured in
cjtemp
mode on the multiplexed module
of the SCXI-1102 in slot
y
of the chassis
with ID
x
.