National Instruments 9215E Manual de usuario

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.

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–

COM

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.

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

–

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.

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