National Instruments 9215E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9215E
4-Channel, ±10 V, 16-Bit Simultaneous Analog
Input Module

NI 9215E Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9215E
and includes dimensions, terminal assignments, and specifications for
the NI 9215E. In this document, the NI 9215E with screw terminal and
NI 9215E with BNC are referred to inclusively as the NI 9215E. Visit
ni.com/info and enter rdsoftwareversion to determine which
software you need for the modules you are using. For information
about installing, configuring, and programming the system, refer to the
system documentation. Visit ni.com/info and enter cseriesdoc
for information about C Series documentation.
Caution National Instruments makes no electromagnetic
compatibility (EMC) or CE marking compliance claims
for the NI 9215E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9215E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.

© National Instruments Corp. 3 NI 9215E Operating Instructions and Specifications
NI 9215E Dimensions
The following figure shows the dimensions of the NI 9215E.
Figure 1. NI 9215E Dimensions in Millimeters (Inches)
73.4 in. (2.89 mm)
0.0 in. (0.00 mm)
26.7 in. (1.05 mm) 58.4 in. (2.30 mm) 66.0 in. (2.60 mm)
0.0 in. (0.00 mm)

NI 9215E Operating Instructions and Specifications 4 ni.com
Connecting the NI 9215E
The NI 9215E provides connections for four differential analog
input channels.
Figure 2. Terminal Assignments of the NI 9215E with Screw Terminal
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–
NC
COM
0
1
2
3
4
5
6
7
8
9

© National Instruments Corp. 5 NI 9215E Operating Instructions and Specifications
Figure 3. Connector Assignments of the NI 9215E with BNC
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–

NI 9215E Operating Instructions and Specifications 6 ni.com
The NI 9215E with screw terminal has a 10-terminal detachable
screw-terminal connector. The NI 9215E with BNC has four BNC
connectors.
Each channel of the NI 9215E has an AI+ terminal to which you
can connect the positive voltage signal, and an AI– terminal or
shield to which you can connect the negative voltage signal. The
NI 9215E with screw terminal also has a common terminal, COM,
that is internally connected to the isolated ground reference of the
module.
Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9215E with screw terminal.

© National Instruments Corp. 7 NI 9215E Operating Instructions and Specifications
Connecting Differential Voltage Signals to the
NI 9215E
You can connect grounded or floating differential signals to the
NI 9215E. Connect the positive voltage signal to AI+ and the
negative voltage signal to AI–. To connect grounded differential
signals to the NI 9215E with screw terminal, you must also connect
the signal reference to the COM terminal, as shown in Figure 4.
Figure 4. Connecting a Grounded Differential Voltage Signal to
the NI 9215E with Screw Terminal
Voltage
Source
+
–
AI+
AI–
COM NI 9215E with
Screw Terminal

NI 9215E Operating Instructions and Specifications 8 ni.com
To connect floating differential signals to the NI 9215E with screw
terminal, you must connect the negative lead of the signal to COM
through a 1 MΩresistor to keep the voltage source within the
common-mode voltage range, as shown in Figure 5. If the voltage
source is outside of the common-mode range, then the NI 9215E
does not read data accurately. The NI 9215E with BNC has internal
circuitry that keeps the voltage source within the common-mode
range. For more information about the common-mode voltage
range, refer to the Specifications section.
Figure 5. Connecting a Floating Differential Voltage Signal to
theNI9215EwithScrewTerminal
1 MΩ
Resistor NI 9215E with
Screw Terminal
AI+
AI–
COM
Voltage
Source
+
–

© National Instruments Corp. 9 NI 9215E Operating Instructions and Specifications
Connecting Single-Ended Voltage Signals to the
NI 9215E
To connect single-ended voltage signals to the NI 9215E with
screw terminal, you must also connect the ground signal to the
COM terminal to keep the common-mode voltage in the specified
range, as shown in Figure 6. For more information about the
common-mode voltage range, refer to the Specifications section.
Figure 6. Connecting a Single-Ended Voltage Signal to the
NI9215EwithScrewTerminal
+
–
AI+
AI–
COM
Voltage
Source
NI 9215E with
Screw Terminal

NI 9215E Operating Instructions and Specifications 10 ni.com
NI 9215E Circuitry
The NI 9215E channels share a common ground that is isolated
from other modules in the system. The NI 9215E protects
each channel from overvoltages. For more information about
overvoltage protection, refer to the Specifications section.
The incoming analog signal on each channel is buffered and
conditioned by the instrumentation amplifier and is then sampled
by a 16-bit ADC. The channels have independent track-and-hold
amplifiers that allow you to sample all four channels
simultaneously. Refer to Figures 7 and 8 for input circuitry
illustrations of the NI 9215E with screw terminal and the
NI 9215E with BNC.