National Instruments Ni 9944 Users Manual 9944/9945 Quarter Bridge Completion Accessory

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USER GUIDE

NI 9944/9945 Quarter Bridge

Completion Accessory

This document describes the features of the National Instruments 9944 and

9945 Quarter Bridge Completion Accessories, referred to inclusively in

this document as the NI 9944/9945. You can use the NI 9944/9945 to add

a quarter bridge to the NI 9237 module. Refer to the NI 9237 Operating

Instructions for more information about the NI 9237.

Figure 1. NI 9944/9945 Quarter Bridge Completion Accessory

What You Need to Get Started

To use the NI 9944/9945, you will need the following:

❑Plastic tie strap for strain relief wrapped around the two front holes,

as shown in Figure 3

❑M4x20 screw, or other hardware that fits in the 8.89 mm (0.350 in.)

outer clearance hole and 4.57 mm (0.180 in.) inner clearance hole,

as shown in Figure 3

NATIONAL

INSTRUMENTS

NI 9944/9945 Accessory User Guide 2 ni.com

NI 9944/9945 Dimensions

The NI 9944/9945 has outer dimensions of 66 × 21.6 × 22.96 mm

(2.6 × 0.85 × 0.90 in.), as shown in Figures 2 and 3.

Figure 2. NI 9944/9945 Dimensions

Figure 3. NI 9944/9945 Dimensions and Hole Clearance

Specifications

The following specifications are typical for the range –40 to 70 °C, unless

otherwise noted.

Weight ....................................................32 g (1.1 oz)

Operating temperature ............................–40 to 70 °C

Resistor value

NI 9944............................................120 Ω

NI 9945............................................350 Ω

Resistance drift

NI 9944............................................0.012 Ω/°C

NI 9945............................................0.035 Ω/°C

Resistor tolerance (at 25 °C)...................0.1% max

Resistor power ........................................0.25 W max

21.6 mm

(0.85 in.)

3 Shield

2 QTR

1 IN+

0 EX+

66 mm (2.6 in.)

Ø 4.57 mm (0.180 in.)

Ø 8.89 mm (0.350 in.)

22.86 mm

(0.90 in.)

Holes for

Tie Strap

© National Instruments Corporation 3 NI 9944/9945 Accessory User Guide

Where to Go for Support

The National Instruments Web site is your complete resource for technical

support. At ni.com/support you have access to everything from

troubleshooting and application development self-help resources to email

and phone assistance from NI Application Engineers.

National Instruments corporate headquarters is located at

11500 North Mopac Expressway, Austin, Texas, 78759-3504.

National Instruments also has offices located around the world to help

address your support needs. For telephone support in the United States,

create your service request at ni.com/support and follow the calling

instructions or dial 512 795 8248. For telephone support outside the United

States, contact your local branch office:

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