NI 9944/9945 Quarter Bridge Completion Accessory User Guide National Instruments 9945 374437a
User Manual: NI 9945
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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. N T INA ST IONA RU L ME NT S 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 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. 0 EX+ 1 IN+ 3 Shield 21.6 mm (0.85 in.) 2 QTR 66 mm (2.6 in.) Figure 2. NI 9944/9945 Dimensions Holes for Tie Strap Ø 8.89 mm (0.350 in.) Ø 4.57 mm (0.180 in.) 22.86 mm (0.90 in.) 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 NI 9944/9945 Accessory User Guide 2 ni.com 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: Australia 1800 300 800, Austria 43 0 662 45 79 90 0, Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599, Canada 800 433 3488, China 86 21 6555 7838, Czech Republic 420 224 235 774, Denmark 45 45 76 26 00, Finland 385 0 9 725 725 11, France 33 0 1 48 14 24 24, Germany 49 0 89 741 31 30, India 91 80 41190000, Israel 972 0 3 6393737, Italy 39 02 413091, Japan 81 3 5472 2970, Korea 82 02 3451 3400, Lebanon 961 0 1 33 28 28, Malaysia 1800 887710, Mexico 01 800 010 0793, Netherlands 31 0 348 433 466, New Zealand 0800 553 322, Norway 47 0 66 90 76 60, Poland 48 22 3390150, Portugal 351 210 311 210, Russia 7 095 783 68 51, Singapore 1800 226 5886, Slovenia 386 3 425 4200, South Africa 27 0 11 805 8197, Spain 34 91 640 0085, Sweden 46 0 8 587 895 00, Switzerland 41 56 200 51 51, Taiwan 886 02 2377 2222, Thailand 662 278 6777, United Kingdom 44 0 1635 523545 © National Instruments Corporation 3 NI 9944/9945 Accessory User Guide National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on ni.com/legal for more information about National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents. © 2006 National Instruments Corporation. All rights reserved. 374437A-01 Sep06
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