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Summary of Contents for Fluke 742A Series
- Page 1 742A Series Resistance Standards Instruction Manual PN 850255 September 1988 Rev. 1, 4/89 © 1988-2015 Fluke Corporation. All rights reserved. All product names are trademarks of their respective companies.
- Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
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Page 3: Table Of Contents
Specifications ..................2 Design and Construction Notes ............. 3 Features ....................3 Operating Notes ..................5 Connecting to the 742A Series ............5 Cable Recommendations ..............5 Operating Temperature Range ............6 How Temperature Correction Factors are Calculated ....... 6 Storage Temperature Range ............. -
Page 4: Introduction
Introduction The 742A Series are small, light, rugged resistance standards. The standards require no temperature-controlled air or oil bath. The 742A Series are well suited for use as the following: • Working standards • Portable transfer standards • Calibration support for the Fluke 5700A Calibrator... -
Page 5: Specifications
742A Series Instruction Manual Specifications Table 1 lists specification for the available 742A Series Resistance Standards. Table 1. 742A Series Resistance Standard Specifications +1 PPM Maximum Error Time Stability Deviation Adder Nominal Maximum Calibration from the When Model Resistance Current 23 °C... -
Page 6: Design And Construction Notes
Design and Construction Notes Design and Construction Notes The 742A Series are constructed of arrays of Fluke wirewound precision hermetically-sealed resistors. No adjustable resistors of any kind are used. Each 742A is built with a temperature coefficient near zero at 23 °C. To further reduce errors caused by temperature changes, the binding posts are constructed of low-thermal emf material. - Page 7 Temperature Correction Factors are Calculated,“ further on in this manual for definitions of alpha and beta, and the formula to predict exact resistance at different temperatures. Fluke Primary Standards Lab Calibration Label documents traceability to the U.S. National Bureau of Standards.
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Page 8: Operating Notes
Operating Notes Operating Notes This part of the manual explains operational and environmental considerations for the 742A Series. Follow these guidelines when operating or storing the resistance standard. Precautions for handling are under “Care and Maintenance.” Connecting to the 742A Series ... -
Page 9: Operating Temperature Range
Figure 4. Connection to Calibrate the 5700A Operating Temperature Range You can use the 742A Series in ambient temperatures between 18 and 28 °C. To predict the deviation from the nominal at temperatures other than 23 °C, use the temperature characterization table provided with each unit. The table shows the calculated value and the deviation from nominal at temperatures between 18 and 28 °C in half-degree increments. - Page 10 Resistance Standards Operating Notes Table 4. Example 742A-1 Temperature Characterization Chart Test Number: XXXX Serial No.: XXXXXX Date: 04-Aug-88 Alpha = -0.090 E-6 Page 2 of 2 Beta = -0.034 E-6 Temp Resistance Dev from nominal (Celsius) (Ohms) (in ppm) 18.0 1.0000006 18.5...
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Page 11: Storage Temperature Range
= 1.00000004 Ω Storage Temperature Range To maintain accuracy within the specified limits, do not subject the 742A Series to temperatures below 0 °C or above 40 °C. If exposure to temperatures outside this range is unavoidable, you can minimize the adverse effects by doing the following: •... -
Page 12: Care And Maintenance
Cleaning the 742A Series To keep the 742A Series looking like new, clean the outer surfaces using a soft cloth slightly dampened with water or a non-abrasive mild cleaning solution that does not harm plastics.
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