Instruction/ maintenance manual of the product cFP-RTD-124 National Instruments
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323349A-01 October 2002 © 2002 National I nstruments Corp. Al l rights res erved. FieldPoint™, Nati onal Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corpo ration. Product and company names ment ioned herein are trademark s or trade names of their respecti ve companies.
FP-RTD-124 and cFP-RTD-124 2 ni.com Installing the FP-R TD-124 The FP - R TD-124 m o unts on a FieldPoint terminal base (FP - TB - x ). Hot plug-and-play enables you to install the FP-R TD-124 onto a powered terminal base without disturbing the operation of other modules or terminal bases.
© National Instruments Corp. 3 FP-RTD-124 and cFP-RTD-124 T o install the cFP-R TD-124, refer to Figure 2 and complete the follow ing steps: 1. Align the capti ve scre ws on the cFP-R TD-124 with the holes on the backplane. The alignment keys on the cFP-R TD-124 pre vent backward insertion.
FP-RTD-124 and cFP-RTD-124 4 ni.com Wiring the [c]FP-R TD-124 The FP-TB- x terminal bases h av e connectio ns for each of the eig ht input channels on the FP-R TD- 124. The cFP-CB- x connector blocks provide the same connections for the cFP-R TD-124. T able 1 lists the terminal assignments for the signals associated with each channel.
© National Instruments Corp. 5 FP-RTD-124 and cFP-RTD-124 Figure 3 sho ws the input circuitr y on one channel. Figure 3. FP-R TD-124 Input Cir cuit T aking Measurements from Four -Wire RTDs Four -wire R TDs generally hav e two wires of one color and tw o of another color (usually red and white).
FP-RTD-124 and cFP-RTD-124 6 ni.com negati ve terminals (COM and SENSE – ). Connect the third wire to the positi ve termi nal (SENSE+). Use a short jumper wire to connect the EXCITE+ terminal to the SENSE+ terminal.
© National Instruments Corp. 7 FP-RTD-124 and cFP-RTD-124 Measuring Resistance Y ou can use the [c]FP-R TD-124 to measure resistance in ohms. In this way , you can take measurements from R TDs of types that the [c]FP-R TD-124 does not directly support (such as 120 Ω nick el R TDs) and from resistiv e devices oth er than R TDs.
FP-RTD-124 and cFP-RTD-124 8 ni.com Unfortunately , not all TCR values are as well def ined b y standards organ izations, and the behavio r of R TDs with the same TCR value may vary from vendor to v endor . The va riations are usually small, and the built-in linearization algorithms of the [c]FP-R TD-124 are appropriate for nearly all applications.
© National Instruments Corp. 9 FP-RTD-124 and cFP-RTD-124 Effects of Lead Resistance The [c]FP-R TD-124 measures resistance by driving a current through a circuit and sensing the resulting voltage.
FP-RTD-124 and cFP-RTD-124 10 ni.com connections are isolated from the backplane and the inter-module communication bus. The isolation is provided b y the module, which has optical and galvanic isolation barriers designed and tested to protect against transient fault v oltages of up to 2,300 V rms .
© National Instruments Corp. 11 FP-RTD-124 and cFP-RTD-124 Specifications These specif ications are typical fo r the range – 40 to 70 ° C unless otherwise noted. Input Characteristic s Number of channels ..................... ..... 8 ADC resolution .
FP-RTD-124 and cFP-RTD-124 12 ni.com Physical Characteristics Indicators ............ ......... ........... .......... Green POWER and READY indicators W eight FP-R TD-124 ........ ............. .......... 140 g (4.8 oz) cFP-R TD-124 ... ............ .
© National Instruments Corp. 13 FP-RTD-124 and cFP-RTD-124 Safety The [c]FP-R TD-124 is designed to meet the requirements of the follow ing standards for safety and electrical equipment for measurement, control, and laboratory use. • EN 61010-1, IEC 61010-1 • UL 3121-1 • CAN/CSA C22.
FP-RTD-124 and cFP-RTD-124 14 ni.com Mechanical Dimensions Figure 7 sho ws the mechanical dimen sions of the FP-R TD-124 installed on a terminal base. Dimensions are gi ven in millimeters [inches].
© National Instruments Corp. 15 FP-RTD-124 and cFP-RTD-124 Finland 09 725 725 11, France 01 48 14 24 24, Germany 089 741 31 30, Greece 01 42 96 427, Hong K ong 2645 3186, In dia 91 80 4190000, Israel.
An important point after buying a device National Instruments cFP-RTD-124 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought National Instruments cFP-RTD-124 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data National Instruments cFP-RTD-124 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, National Instruments cFP-RTD-124 you will learn all the available features of the product, as well as information on its operation. The information that you get National Instruments cFP-RTD-124 will certainly help you make a decision on the purchase.
If you already are a holder of National Instruments cFP-RTD-124, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime National Instruments cFP-RTD-124.
However, one of the most important roles played by the user manual is to help in solving problems with National Instruments cFP-RTD-124. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device National Instruments cFP-RTD-124 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
