Chapter 3
Signal Connections
©
National Instruments Corporation
3-3
SCXI-1102/B/C User Manual
Front Connector Signal Descriptions
Analog Input Signal Connections
The signal terminals for the positive input channel are located in
column B of the connector. The signal terminal for each corresponding
negative input channel is located in column C of the connector. Each
input goes to a separate filter and amplifier that is multiplexed to the
module output buffer. The terminal block temperature sensor output—
connected to pins A3 and A4 (CJSENSOR)—is also filtered and
multiplexed to the module output buffer.
The differential input signal range of an SCXI-1102/B/C module input
channel is
±
10 V/G, where G is the gain selected on the SCXI-1102/B/C
module input channel. This differential input range is the maximum
measurable voltage difference between the positive and negative
channel inputs. The common-mode input signal range of an
SCXI-1102/B/C module input channel is
±
11 V. This common-mode
Pin
Signal Name
Description
A1
+5 V
+5 VDC Source—Used to
power the temperature sensor
on the terminal block. 0.2 mA
of source not protected.
A2, A5, A16,
A24, A32
CGND
Chassis Ground—Tied to the
SCXI chassis.
A3, A4
CJSENSOR
Cold-junction Temperature
Sensor Input—Connects to
the temperature sensor of the
terminal block.
B1–B32
CH31- through CH0–
Negative Input Channels —
Negative side of differential
input channels.
C1–C32
CH31+ through CH0+
Positive Input Channels 31
through 0—Positive side of
differential input channels.
All other pins are not connected.
