National Instruments NI 9237E Series Bedienungsanleitung

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9237E

4-Channel, 24-Bit Half/Full-Bridge Analog Input Module

NI 9237E Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9237E

and includes dimensions, pin assignments, and specifications for the

NI 9237E. In this document, the NI 9237E with RJ-50 connectors

and the NI 9237E with DSUB are referred to inclusively as the

NI 9237E. 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 9237E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9237E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

NI 9237E Dimensions

The following figure shows the dimensions of the NI 9237E.

Figure 1. NI 9237E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

NI 9237E Operating Instructions and Specifications 4 ni.com

Connecting the NI 9237E

The NI 9237E has four RJ-50 receptacles or a 37-pin DSUB

connector that provides connections for four half or full bridges,

and an external excitation voltage source.

Figure 2. NI 9237E with RJ-50 Pin Assignments

Ch 0

Ch 1

Ch 2

Ch 3

AI+

AI–

RS+

RS–

EX+

EX–

T+

T–

Ch0 – Ch3

EX+ EX+

EX– EX–

Figure 3. NI 9237E with DSUB Pin Assignments

RS0+

EX0+

AI0+

SC0+

RS1+

EX1+

AI1+

SC1+

T–

Vex+

RS2+

EX2+

AI2+

SC2+

RS3+

EX3+

AI3+

SC3+

T–

RS0–/SC0–

EX0–

AI0–

T0+

RS1–/SC1–

EX1–

AI1–

T1+

T–

Vex–

RS2–/SC2–

EX2–

AI2–

T2+

RS3–/SC3–

EX3–

AI3–

T3+

NI 9237E Operating Instructions and Specifications 6 ni.com

When you connect a half bridge to the NI 9237E, you must connect

the AI+, EX+ and EX–, and RS+ and RS– signals, but you do not

need to connect the AI– signal because it is connected internally.

When you connect a full bridge, you must connect the AI+ and

AI–, EX+ and EX–, and RS+ and RS– signals. Refer to Figure 4

for an illustration of how to connect half and full bridges to the

NI 9237E.

Note You can use a quarter bridge with the NI 9237E if

you add a resistor externally to create a half bridge. You

also can use a quarter bridge with the NI 9237E

with RJ-50 if you use the NI 9944 or NI 9945 Quarter

Bridge Completion Accessory. Visit ni.com and search

for the NI 9944 and NI 9945 Quarter Bridge Completion

Accessories for more information about these accessories

and how to purchase them.

Note National Instruments does not recommend using

an RJ-45 cable with the NI 9237E with RJ-50 because it

can physically damage pins 1 and 10 on the device, and

thus permanently disable shunt calibration no matter

what connector you use.

Note When you insert or remove a new sensor from the

NI 9237E, slight changes in the excitation voltages can

cause a mismatch between the internal half-bridge

completion resistors and the half-bridge sensors, which

results in a change in the measurement offsets.

National Instruments recommends performing bridge

calibrations of quarter- or half-bridge sensors after

connecting all sensors to the NI 9237E and after

removing or attaching any additional sensor. Visit

ni.com/info and enter the info code rdw9237 for more

information about changes in voltage offsets in the

NI 9237E.

NI 9237E Operating Instructions and Specifications 8 ni.com

Figure 4. Connecting a Half or Full Bridge to the NI 9237E

1NI9237E with DSUB only 2NI9237E with RJ-50 only

EX+

EX–

RS+

RS–

RS– /SC–

T+

T–

AI–

AI+

TEDS

NI 9237E

Each channel on the NI 9237E has an independent 24-bit ADC

and an input amplifier that enable you to sample signals from all

four channels simultaneously.

The NI 9237E is isolated from earth ground. However, the

individual channels are not isolated from each other. The EX+,

EX–, and T– signals are common among all channels. You can

connect the NI 9237E to a device that is biased at any voltage

within the NI 9237E rejection range of earth ground. Refer to the

Specifications section for more information about the

common-mode rejection ratio (CMRR).

You also can connect floating signals to the NI 9237E. If you

connect floating signals to the NI 9237E, National Instruments

recommends connecting the EX– signal to the earth ground or

shield for better noise rejection.

The NI 9237E also includes filters to prevent aliasing. The filters

on the NI 9237E filter according to the data rate. Refer to the

Understanding NI 9237E Filtering section for more information

about filtering.

NI 9237E Operating Instructions and Specifications 10 ni.com

Wiring TEDS Channels

Ensure that neither the TEDS data (T+) nor the TEDS return (T–)

signal is tied in common to any AI signals on the NI 9237E. The

NI 9237E connects all the T– signals together internally. The

NI 9237E with DSUB has only three T– pins. To connect four

TEDS sensors to the NI 9237E with DSUB, wire the TEDS return

signals of two of the sensors to one of the T– pins. Visit

ni.com/info and enter the info code rdteds for more

information about TEDS sensors.

Connection Options to Correct for Resistance Errors

Wiring resistance can create errors in bridge circuits. The

NI 9237E provides two mechanisms to correct for these errors:

remote sensing and shunt calibration.

Remote Sensing

Remote sensing continuously and automatically corrects for errors

in excitation leads, and generally is most appropriate for half- and

full-bridge sensors.

Long wire and small gauge wire have greater resistance, which can

result in gain error. The resistance in the wires that connect the

excitation voltage to the bridge causes a voltage drop, which is a

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