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CALIBRATION PROCEDURE
CB-27T T
Introduction
What Is Calibration?
Why Should You Verify?
How Often Should You Verify?
™
™
National Instruments
, NI
, and ni.com
trademarks or trade names of their respective companies.
370344A-01
B
ERMINAL
LOCK
This document contains information and step-by-step instructions for
verifying the performance of the temperature sensor on the
National Instruments CB-27T terminal block. This temperature sensor
is for cold-junction compensation of thermocouples on the terminal block.
Calibration consists of verifying the measurement accuracy of a device
and adjusting for any measurement error. Verification is measuring
performance of a device and comparing the results to the factory
specifications. Because the CB-27T terminal block is not user-adjustable,
calibrating this device consists of verifying the performance only, without
correcting for any error.
The accuracy of electronic components drifts with time and temperature,
which can affect measurement accuracy as the device ages. Verification
ensures that your CB-27T terminal block still meets NI standards. If the
results of the procedure indicate that the temperature sensor on
your terminal block is out of specification, return the terminal block to
National Instruments for repair or replacement.
The measurement accuracy requirements of your application determine
how often you should verify the performance of your CB-27T terminal
block. National Instruments recommends you verify your terminal block
at least once every year. You can shorten this interval to six months or
90 days based on the demands of your application.
™
are trademarks of National Instruments Corporation. Product and company names mentioned herein are
Copyright © 2001 National Instruments Corp. All rights reserved.
May 2001
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Summary of Contents for National Instruments CB-27T
- Page 1 The accuracy of electronic components drifts with time and temperature, which can affect measurement accuracy as the device ages. Verification ensures that your CB-27T terminal block still meets NI standards. If the results of the procedure indicate that the temperature sensor on your terminal block is out of specification, return the terminal block to National Instruments for repair or replacement.
- Page 2 Software and Documentation You can find all the necessary information to verify the performance of the CB-27T in this verification procedure. No other software or documentation is required. If you would like more information on the CB-27T, refer to the CB-27T Terminal Block Installation Guide, which you can download free of charge from the NI Web site at ni.com/manuals...
- Page 3 Verifying Temperature Sensor Performance Complete the following steps to verify the performance of the temperature sensor on your CB-27T terminal block: Move the IEX switch to the OFF position. Figure 1 shows the location of the IEX switch. 1 Pin 1 2 IEX Switch Figure 1.
- Page 4 IEX- CJS- IEX+ CJS+ Figure 2. CB-27T Connector Block Connect the sense leads of the DMM to the temperature-sensor output of the terminal block. Attach a wire to pin 2 of the connector block. Attach the other end of this wire to the positive input terminal of the DMM.
- Page 5 • If T > (T meas is nonfunctional. Return the terminal block to NI for repair or replacement. You have completed verifying the performance of the temperature sensor on your CB-27T terminal block. © National Instruments Corporation CB-27T Calibration Procedure...
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