Fluke 74X Series Calibration Manual
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Fluke 74X Series Calibration Manual

Fluke 74X Series Calibration Manual

Documenting process calibrator
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74X Series
Documenting Process Calibrator
Calibration Manual
PN 602505
February 1997 Rev. 2, 4/99
© 1997,1998,1999 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

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Summary of Contents for Fluke 74X Series

  • Page 1 ® 74X Series Documenting Process Calibrator Calibration Manual PN 602505 February 1997 Rev. 2, 4/99 © 1997,1998,1999 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.

  • Page 3: Table Of Contents

    Table of Contents Title Page Introduction ......................1 Safety Information ....................1 Specifications....................... 3 DC Voltage Measurement ................3 AC Voltage Measurement ................3 DC Current Measurement................4 Resistance Measurement ................. 4 Continuity Testing................... 4 Frequency Measurement ................. 4 DC Voltage Output..................5 DC Current Output ..................
  • Page 4 74X Series Calibration Manual HART Mode Verification..................29 Calibration ......................30 Equipment Required for Calibration ............... 30 Calibration Status Indicator................31 Calibration Constant Out of Bounds ............... 31 Order of Calibration ..................31 How to Calibrate ..................... 32 Adjustment of Potentiometers ................34 Replaceable Parts....................
  • Page 5 List of Tables Table Title Page Definition of Symbols..................... 2 Equipment Required for Verification..............11 DC Volts Measurement Verification Points............13 AC Volts Measurement Verification Points............14 DC Current Measurement Verification Points ............15 Resistance Measurement Verification Points............16 Frequency Measurement Verification Points ............17 DC Volts Source Verification Points ..............
  • Page 6 74X Series Calibration Manual...
  • Page 7 List of Figures Figure Title Page LCD Operating Environment Specification ............10 DC Volts and AC Volts Measurement Connections ..........12 DC Current Measurement Verification Connections ..........15 Resistance Measurement Verification Connections ..........16 Frequency Measurement Verification Connections ..........17 DC Volts Source Verification Connections ............
  • Page 8 74X Series Calibration Manual...

  • Page 9: Introduction

    Unless stated otherwise, everything in this manual applies to the Fluke 741, 741B, 743, 743B and 744 Documenting Process Calibrators, also referred to as the 74X Series in this manual. The phone number in the USA and Canada for replacement parts is: 1-888-993-5853.
  • Page 10 74X Series Calibration Manual • Do not use the calibrator if it operates abnormally. Protection may be impaired. When in doubt, have the calibrator serviced. • Select the proper function and range for your measurement. • Use caution when working above 30V ac rms, 42V ac pk, or 60V dc. Such voltages pose a shock hazard.

  • Page 11: Specifications

    "% of full scale." The measure pressure, temperature, and frequency functions are specified only with damping on. The standard specification intervals for the 74X Series is 1 and 2 years. Typical 90-day source and measurement accuracy can be estimated by dividing the 1 year "% of Reading"...

  • Page 12: Dc Current Measurement

    74X Series Calibration Manual DC Current Measurement Range Resolution % of Reading +% of Full Scale 1 Year 2 Year 1 µA 30 mA 0.01% + 0.015% 0.02% + 0.015% 10 µA 110 mA 0.01% + 0.015% 0.02% + 0.015% Temperature Coefficient: (0.001% of rdg.

  • Page 13: Dc Voltage Output

    Specifications DC Voltage Output Range Resolution % of Output + % of Full Scale 1 Year 2 Year 1 µV 110 mV 0.01% + 0.005% 0.015% + 0.005% 10 µV 1.1 V 0.01% + 0.005% 0.015% + 0.005% 100 µV 15 V 0.01% + 0.005% 0.015% + 0.005%...

  • Page 14: Frequency Sourcing

    74X Series Calibration Manual Frequency Sourcing Range Accuracy 0.00 Hz to 10.99 Hz 0.01 Hz 11.00 Hz to 109.99 Hz 0.1 Hz 110.0 Hz to 1099.9 Hz 0.1 Hz 1.100 kHz to 21.999 kHz 0.002 kHz 22.000 kHz to 50.000 kHz 0.005 kHz...
  • Page 15 Specifications Temperature, Thermocouples (cont.) Temperature, TCs Range °C Type Measure °C Source °C 1 Year 2 Year 1 Year 2 Year -20 to 0 0 to 100 100 to 1767 -20 to 0 0 to 200 200 to 1400 1400 to 1767 0 to 800 800 to 1200 1200 to 1800...

  • Page 16: Temperature, Resistance Temperature Detectors

    74X Series Calibration Manual Temperature, Resistance Temperature Detectors Temperature, RTDs Type (α) Range °C Measure °C Source °C 1 Year 2 Year 1 Year 2 Year 100Ω Pt(3926) -200 to 0 0 to 630 100Ω Pt(385) -200 to 0 0 to 400 400 to 800 120Ω...

  • Page 17: Loop Power Supply

    Specifications Loop Power Supply Setting 1 Year 2 Year 24 Volt 28 Volt Short circuit protected Maximum Current: 22 mA Maximum Input Voltage: 30V dc Top and Bottom Limits of Ranges with Auto Range On Range, dc V Measure Top of Range Bottom of Range 110 mV ±110.000 mV...

  • Page 18: General Specifications

    74X Series Calibration Manual General Specifications Display: 240 by 200 pixel graphic LCD, 70 x 58 mm. Power: Internal battery pack: NiCd, 7.2V, 1700 mAh. Memory Backup: Lithium battery, 5 years typical lifetime. Dimensions: 130 x 236 x 61 mm (5.1 x 9.3 x 2.4 in.).

  • Page 19: Performance Verification Tests

    Performance Verification Tests Performance Verification Tests Fluke recommends re-certification every year. To re-certify, perform the verification procedure. If any test points are out of tolerance, you need to calibrate, then re-verify. Two-year specifications are included for those customers who do not require the highest accuracy.

  • Page 20: Dc Volts Measurement

    74X Series Calibration Manual • Ranges in the specification tables include the 10% over-range capability. Range names on the 74X display do not include the 10% over-range. For example, the UUT display shows Range 100 mV, but the range name in the table is 110 mV.
  • Page 21 Performance Verification Tests Table 3. DC Volts Measurement Verification Points Input Minimum Maximum Minimum Maximum Range 1 Year 1 Year 2 Year 2 Year 110 mV 0 mV -0.017 0.017 -0.017 0.017 110 mV 100 mV 99.959 100.042 99.934 100.067 110 mV -100 mV -100.042...

  • Page 22: Ac Volts Measurement

    74X Series Calibration Manual AC Volts Measurement Proceed as follows to verify the AC Volts Measurement function: 1. Connect the UUT to the 5500A as shown in Figure 2. Connect the three lows (black jacks) with jumpers. 2. Set the UUT to the AC Volts Measurement function.

  • Page 23: Dc Current Measurement

    Ω SENSE INPUT TRIG 1V PK 20V PK SOURCE MEAS 300V GUARD 20V PK FLUKE 5500A CALIBRATOR HP3458 FLUKE 74X gb04f.eps Figure 3. DC Current Measurement Verification Connections Table 5. DC Current Measurement Verification Points Input Minimum Maximum Minimum Maximum...

  • Page 24: Resistance Measurement

    74X Series Calibration Manual Resistance Measurement Proceed as follows to verify the Resistance Measurement function: 1. Connect the UUT to the 5500A as shown in Figure 4. Use a four-wire connection at the 5500A, transitioning to two wires at the UUT, and turn Two-Wire Compensation 2.

  • Page 25: Frequency Measurement

    200V PK AUX V 1000V TRIG 1V PK 20V PK SOURCE MEAS 300V 20V PK FLUKE 5500A CALIBRATOR FLUKE 74X gb06f.eps Figure 5. Frequency Measurement Verification Connections Table 7. Frequency Measurement Verification Points Frequency Minimum Maximum UUT Range V RMS Input 1 &...

  • Page 26: Dc Volts Source

    74X Series Calibration Manual DC Volts Source Proceed as follows to verify the DC-Volts Source function: 1. Connect the UUT to the HP3458A as shown in Figure 6. 2. Set the 3458A to measure dc-volts. 3. Set the UUT to the DC-Volts Source function at -10 mV.

  • Page 27: Dc Current Source

    6. When you are finished, press c twice on the UUT to set the Source function to off. This saves battery life. Ω SENSE INPUT SOURCE MEAS 300V GUARD HP3458 FLUKE 74X gb08f.eps Figure 7. DC Current Source Verification Connections Table 9. DC Current Source Verification Points Minimum Maximum Minimum Maximum Range...

  • Page 28: Simulate Transmitter Function

    74X Series Calibration Manual Simulate Transmitter Function Proceed as follows to verify the Simulate Transmitter function (accessed through DC Current Source function): 1. Connect the UUT, HP3458A, and 5500A as shown in Figure 8. The 5500A is used as a stable dc voltage source. Its value is not critical, and another dc source such as a battery can be substituted.
  • Page 29 6. When you are finished, press ctwice on the UUT to set the Source function to off. This saves battery life. Ω SENSE INPUT GUARD SOURCE MEAS 300V HP3458A MULTIMETER FLUKE 74X gb10f.eps Figure 9. Resistance Source Verification Connections Table 11. Resistance Source Verification Points Minimum Maximum Minimum Maximum Range...

  • Page 30: Frequency Source

    74X Series Calibration Manual Frequency Source Proceed as follows to verify the Frequency Source function: 1. Connect the UUT to the PM6666 counter as shown in Figure 10. 2. Set the UUT to Source, Frequency, 1.000 Vpp , Square Wave, at 5Hz.

  • Page 31: Thermocouple Measure

    THERMOCOUPLE WIRE SOURCE MEAS 300V GUARD GROUND CURRENT ROOM TEMPERATURE FLUKE 74X FLUKE 5500A CALIBRATOR LAG BATH gb12f.eps Figure 11. Temperature Measure (TC) Verification Connections Table 13. Temperature Measure Verification Input dcmV Minimum Maximum Minimum Maximum (referenced to 0 °C) 1-Year °C...

  • Page 32: Thermocouple Source

    74X Series Calibration Manual Thermocouple Source Proceed as follows to verify the Thermocouple Source function. This test uses a Type-K thermocouple setting on the UUT. 1. Use Type-K thermocouple wire and copper wire to connect the HP3458A to the UUT -TC jack as shown in Figure 11 (the HP3458A is used in place of the 5500A).

  • Page 33: Rtd Measure, Four-Wire

    TRIG 1V PK 20V PK SOURCE MEAS 300V 20V PK FLUKE 5500A CALIBRATOR FLUKE 74X 4-WIRE COMP ON 4-WIRE RTD gb13f.eps Figure 12. Four-Wire RTD Measure Verification Connections Table 15. RTD Measure Verification (100W Pt (385), Four-Wire Connection) Input °C 1-Year ( °C )

  • Page 34: Rtd Measure, Three-Wire

    74X Series Calibration Manual RTD Measure, Three-Wire Proceed as follows to verify the three-wire RTD measure function. If a 5500A is not available, substitute a variable resistance source such as a General Resistance RTD-100 RTD Simulator and a DMM to measure the variable resistance source accurately. Use the resistance equivalents shown in Table 16.

  • Page 35: Rtd Source

    Performance Verification Tests RTD Source Proceed as follows to verify the RTD Source function: 1. Connect the UUT to the HP3458A DMM as shown in Figure 9. Use a 4-wire connection transitioning to 2-wires at the UUT. Set the HP3458A to 4-Wire Ohms, auto-range.

  • Page 36: Loop Power

    74X Series Calibration Manual Loop Power Proceed as follows to verify the Loop Power function. 1. Connect the UUT to the HP3458A DMM as shown in Figure 14. 2. On the UUT press [SETUP], [ENTER], select Loop Power 24V , and press [ENTER] again.

  • Page 37: Hart Mode Verification

    HART Mode Verification HART Mode Verification The following test verifies the ability of the Fluke 744 to communicate over a serial ® HART (Highway Addressable Remote Transducer) interface to a HART transmitter. The calibrator communicates with virtually all HART transmitters and related software versions.

  • Page 38: Calibration

    The calibrator has passed the HART mode verification test. 5. If the calibrator does not recognize the transmitter, the test has failed and the calibrator requires repair. Contact your nearest authorized Fluke Service Center for additional service. 6. Disconnect and secure all test equipment.

  • Page 39: Calibration Status Indicator

    Calibration Calibration Status Indicator The calibration display is accessed by pressing [ SETUP ], and then the Next Page softkey three times. At the top of the display is the followed by a number. Calibration Status This number is incremented after each subroutine is finished and the new constants are saved.

  • Page 40: How To Calibrate

    74X Series Calibration Manual 1. If is to be calibrated, should be calibrated first. In other mA Source mA Measure words, re-calibrating could affect mA Measure mA Source 2. If is to be calibrated, the following sub-routines should be done...
  • Page 41 Calibration Caution Do not force a dual banana plug between any two jacks in the horizontal orientation (see Figure 16). Doing so will damage the jacks. Use the supplied jumper wires. You can use a dual banana plug in the vertical orientation. NOT OK gb16f.eps Figure 16.

  • Page 42: Adjustment Of Potentiometers

    74X Series Calibration Manual The other functions are also calibrated by following the step-by-step instructions on the display. When you calibrate the [ ] function, it requests Frequency Source: Frequency Source that you measure the frequency and voltage output. This signal is an approximate 50% duty cycle, positive square wave, and the amplitude needs to be measured in pk volts, so multiply the DMM reading by 2.

  • Page 43: Replaceable Parts

    Table 19 lists the customer replaceable parts. Replacement parts can be ordered from the Fluke Corporation and its authorized representatives by using the part number under the heading Part Number column. In the U.S., order directly from the Fluke Parts Dept. by calling 1-888-993-5853. Parts price information is available from the Fluke Corporation or its representatives.

  • Page 44: Service Centers

    Used on 743B only Used on 744 only Service Centers To locate an authorized service center, call Fluke using any of the phone numbers listed below , or visit us on the World Wide Web: www.fluke.com USA and Canada: 1-888-99-FLUKE (1-888-993-5853)

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