Connecting The Terminal Block To The Scxi Module; Using The Scxi-1300 With Thermocouples; Connecting Thermocouples - National Instruments SCXI-1300 Installation Manual

Connecting the Terminal Block to the SCXI Module

Using the SCXI-1300 with Thermocouples

Connecting Thermocouples

Note National Instruments does not recommend setting jumper W1 on the SCXI-1100
in the non-parking position. This grounds the negative terminal on the SCXI-1100
instrumentation amplifier through a 100 kΩ resistor, possibly increasing measurement
noise and settling time.
SCXI-1300/1301 Terminal Block
To connect the terminal block to the SCXI module front connector, perform
the following steps:
1. Connect the SCXI-1300/1301 terminal block to the mating connector
on the module front connector.
2. Tighten the top and bottom thumbscrews on the back of the terminal
block to hold it securely in place.
In
This section describes how to use the thermocouple capability of your
SCXI-1300 terminal block.
♦
SCXI-1100
If you are using a ground-referenced thermocouple, connect the
thermocouple positive and negative leads to CH+ and CH– respectively.
Leave jumper W1 on the SCXI-1100 in the factory-default (parking)
position.
If you are using a non-referenced (floating) thermocouple, the SCXI-1100
instrumentation amplifier can be driven into saturation if the thermocouple
is not grounded properly. Choose one of the following two options to
ground the thermocouple:
• Ground the negative lead of the thermocouple near the thermocouple
junction. Leave jumper W1 on the SCXI-1100 in the factory-default
(parking) position.
• Ground the negative lead of the thermocouple inside the SCXI-1300
terminal block, by connecting CH– to CHSGND as shown in Figure 4.
In most applications, this is the most convenient grounding option.
Leave jumper W1 on the SCXI-1100 in the factory-default (parking)
position.
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