barfield 2471F User Instruction Manual
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barfield 2471F User Instruction Manual

Megohmmeter
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4101 Northwest 29th Street
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2471F
MEGOHMMETER
USER INSTRUCTION MANUAL
BARFIELD M/N 2471F
56-101-00220-B
September 23, 2008
________________________________________
BARFIELD, INC.

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  • Page 1 To buy, sell or trade in this product click on the link below: http://www.avionteq.com/Barfield-2471F-MEGOHMMETER-PN-101-00220.aspx www.avionteq.com 2471F MEGOHMMETER USER INSTRUCTION MANUAL BARFIELD M/N 2471F 56-101-00220-B September 23, 2008 ________________________________________ BARFIELD, INC. Corporate Headquarters 4101 Northwest 29th Street Miami, Florida 33142 www.barfieldinc.com...
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  • Page 5 2471F INSTRUCTION MANUAL CONTACT INFORMATION Users are requested to notify the manufacturer of any discrepancy, omission, or error found in this manual. Inquiries should include specific questions and reference the publication title, number, chapter, page, figure, paragraph, and effective date.
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  • Page 7 Although every effort has been made to provide the end user of this equipment with the most current and accurate information, it may be necessary to revise this manual in the future. Please be sure to complete and return a Revision Request Form to Barfield revision services and visit the company website, http://barfieldinc.com/, for publication updates.
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  • Page 9 2471F INSTRUCTION MANUAL REVISION RECORD REV. ECO # REV. DATE DESCRIPTION OF CHANGE N / A June 1986 Initial Release. Company logo and contact information was updated. 260-00729 Sep / 23 / 2008 Chapters were reorganized. 56-101-00220-B Rev. 09 / 23 / 08...
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  • Page 11 2471F INSTRUCTION MANUAL LIST OF APPROVED REPAIR FACILITIES The manufacturer of this equipment does not recommend the user to attempt any maintenance or repair. In case of malfunction, contact the manufacturer, to obtain the list of approved repair facilities worldwide, ensuring that this equipment will be serviced using proper procedures and certified instruments.
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  • Page 13: Table Of Contents

    Figure 1: Identification Label.......................1 Figure 2: Owner Warranty Registration Card..................2 Figure 3: Limited Warranty Statement Card ..................2 Figure 4: General View of the Megohmmeter 2471F................5 Table 1: Current Consumption during Resistance Measurement ............6 Table 2: Resistance Reading Parameters ..................6 56-101-00220-B...
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  • Page 15: Introduction

    2471F INSTRUCTION MANUAL INTRODUCTION 1. PUBLICATION BREAKDOWN This user instruction manual establishes the standards of operation for Barfield’s 2471F Megohmmeter. Its purpose is to provide sufficient information for the personnel unfamiliar with this unit to understand it, identify its parts, and operate it in accordance with proper procedures, operating techniques, precautions and limitations.
  • Page 16 2471F INSTRUCTION MANUAL B. The Owner's Warranty Registration card (Figure 2) is to be completed by the owner and returned to Barfield, Inc. within ten (10) days of purchase to ensure automatic update of printed matter and validation of warranty.

  • Page 17: Recertification

    2471F INSTRUCTION MANUAL D. The Certificate of Calibration: Each new unit and re-certified unit, is delivered with a Cer- tificate of Calibration that shows the date of the last calibration and when the next cali- bration is due. It certifies the accuracy of the unit and lists the part number and serial number to which it applies.
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  • Page 19: Product Description

    The output current of the 2471F is limited to a maximum of 30 microamperes even at the 500 volt test potential. This current is well below human sensibility, so that there is no sensation of current if the bare probes are touched with the tester activated.

  • Page 20: Theory

    2471F INSTRUCTION MANUAL 2. THEORY A transistor converter increases the battery supply to the 100, 200, and 500 volt test poten- tials selected by the panel switch. A high performance operational amplifier increases the impedance and sensitivity of the panel meter to measure the voltage drop across the test probes in terms of resistance.
  • Page 21 2471F INSTRUCTION MANUAL Accessories supplied with the instrument are as follows. • Portable vinyl overall carrying case, Eveready type, with test cable compartment. • Plug-in test cable leads. • Separable probe clip. Batteries required for instrument operation are as follows.
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  • Page 23: Operating Instructions

    PRESSED FOR HIGH VOLTAGE CONVERTER TO COME UP TO FULL POTENTIAL, AND CAPACITANCE IN THE CIRCUIT UNDER TEST MAY REQUIRE CHARGING TIME. Consult the Application Notes (Next Section) for further details on specific application of the 2471F to insulation testing. 56-101-00220-B CH. 2 09 / 23 / 08...

  • Page 24: Application Notes

    2471F INSTRUCTION MANUAL 2. APPLICATION NOTES Insulation sometimes will exhibit different leakage resistance with different test poten- tials applied. A reduced resistance reading with an increased setting of the VOLTS switch is a normal condition in such cases. If the probes are connected across an appreciable value of capacitance, the meter will respond very slowly as a reaction to the charging time of the capacitor (approximately 5 seconds are required for 0.1 µF and 1 minute for 1 µF).

  • Page 25: Care And Maintenance

    MOVE BATTERIES IF TEST SET IS TO BE STORED FOR PROLONGED PERIODS. Do not subject megohmmeter to electrically energized circuit. The 2471F is safe from damage from externally applied AC or DC voltages up to 300 volts, but high voltages may be dangerous to the operator and will produce erroneous readings.
  • Page 26 2471F INSTRUCTION MANUAL To gain access to the batteries, release the strap across the top of the meter and re- move tester from its carrying case. Place the test set in a clean area. (A clean cloth or paper pad placed to the right of the test set to receive the inverted panel it desirable).

  • Page 27: Receiving, Shipping, And Storage

    2471F INSTRUCTION MANUAL CHAPTER 3: RECEIVING, SHIPPING, AND STORAGE RECEIVING No special unpacking procedures are necessary. It is recommended that the factory shipping container and packing materials be retained should it become necessary for any reason to reship the instrument.

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101-00220

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