Fluke 742A-1, Instruction Manual

Page 1: ...P N 850255 September 1988 1988 John Fluke Mfg Co Inc all rights reserved Litho in U SA ...

Page 2: ...transportation prepaid and a description of the malfunction to the nearest Fluke Service Center The instrument shall be repaired at the Service Center or at the factory at Fluke s option and returned to purchaser transportation prepaid FLUKE ASSUMES NO RISK FOR IN TRANSIT DAMAGE THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIE...

Page 3: ...environment within the range of 18 to 28 C The standards come with six month and one year uncertainty specifications Depending on the accuracy required a 742A can be recertified at intervals based on either specification Each 742A comes with a Report of Calibration and a rear panel label showing the mea sured value The rear panel also has a Fluke Primary Standards Lab calibration label labels that...

Page 4: ...racy The initial resistance is trimmed to 2 ppm of nominal The measured value is printed on the rear panel Operating Temperature Range 23 5 C Storage Temperature Range 0 to 40 C Report of Calibration The report of calibration includes a table of resistance values in 0 5 increments from 18 to 28 C Size 8 64 cm H x 10 54 cm W x 12 70 cm L including binding posts 3 4 in H x 4 15 in W x 5 0 in L inclu...

Page 5: ...ermal emf material FEATURES Figure 1 shows a front panel view Figure 2 shows a rear panel view Table 2 describes binding post functions Table 3 describes the rear panel labels Figure 1 Typical Front Panel View Table 2 Functions of the Binding Posts 742A BINDING POST FUNCTION CURRENT HI Input for the current source from an ohmmeter CURRENT LO Input for the current source from an ohmmeter SENSE HI M...

Page 6: ...l Shows alpha and beta centered on 23 C Refer to How 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 Serial number label Shows the standard s serial number This nu...

Page 7: ...Use these binding posts as described in Table 2 For the case to act as a shield the CHASSIS GROUND binding post must be connected to earth ground or instrument guard at some point in a calibration system Normally when two or more instruments with guards are connected together the use of a single common grounding point avoids ground loops If applicable ground the 742A CHAS SIS GROUND binding post t...

Page 8: ...f alpha and beta are individual ized for each 742A Alpha and beta are established by measurement in the Fluke Primary Standards Lab at 18 C 23 C and 28 C The temperature characterization table is generated from these three measurements and the following formula R R23 1 a t 23 P t 23 2J Where Rt Resistance at t C R23 Resistance at 23 C a Slope of the curve ppm C at 23 C p Rate of change of slope of...

Page 9: ...0000007 0 7 19 0 1 0000008 0 8 19 5 1 0000009 0 9 20 0 1 0000010 1 0 20 5 1 0000010 1 0 21 0 1 0000010 1 0 21 5 1 0000011 1 1 22 0 1 0000011 1 1 22 5 1 0000010 1 0 23 0 1 0000010 1 0 23 5 1 0000009 0 9 24 0 1 0000009 0 9 24 5 1 0000008 0 8 25 0 1 0000007 0 7 25 5 1 0000006 0 6 26 0 1 0000004 0 4 26 5 1 0000003 0 3 27 0 1 0000001 0 1 27 5 0 9999999 0 1 28 0 0 9999997 0 3 ...

Page 10: ...0000010 1 0000003 0 0000003 1 0000010 1 0000000 i oooooi on R R23 1 a t 23 p t 23 2 At 26 C R26 1 0000010 1 0 09 E 6 3 0 034 E 6 3 2 1 000001 0 1 0 0000003 0 0000003 1 0000010 1 0 0000006 1 0000004Q 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 unavo...

Page 11: ...ou transport the standard it is recommended that you use the Option 742A 7002 Transit Case for shock and temperature protection The case holds two 742A Series Resistance Standards SERVICING INFORMATION Because the 742A Series are certified and non adjustable resistance standards they are considered non user repairable If the unit is damaged it must be returned to the factory for repair and recalib...

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