![background image](http://html1.mh-extra.com/html/national-instruments/scxi-1502/scxi-1502_user-manual_3391992020.webp)
Chapter 2
Connecting the Signals
SCXI-1502 User Manual
2-6
ni.com
Figure 2-2.
Floating Signal Connection Referenced to Chassis Ground
Cold-Junction Sensor Connection
Pins A3 and A4 (CJ SENSOR) connect the temperature sensor located on
the terminal block to the SCXI-1502 module. Refer to the installation guide
of the terminal block, to determine if it has a CJC sensor. The CJ SENSOR
signal is measured relative to CH GND. Pins A3 and A4 are connected
within the SCXI-1502 module so the position of the
MTEMP
/
DTEMP
jumper on the SCXI-1300 or SCXI-1303 does
not
matter. The input is
overvoltage-protected to
±
15 VDC with power on and off.
Caution
Exceeding the overvoltage protection on the CJ SENSOR input can damage the
SCXI-1502 module, the SCXIbus, and the DAQ device. NI is
not
liable for any damages
or injuries resulting from such signal connections.
Rear Signal Connector
Table 2-3 shows the SCXI-1502 module rear signal connector pin
assignments.
F
ront Signal
Connector
SCXI - 1502
Referenced to
Chassis Ground
Floating
Signal
Make This
Connection
to Ground
Reference
the Signal
CH 0+
CH 0–
CH 1+
CH 1–
CH GND
R
bias
CH 31+
CH 31–
V
s
+
–
+
–
+
–
+
–