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iET LOM-4000 User And Service Manual

Digital ohmmeter lom-4000 series
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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
LOM-4000 SERIES
Digital Ohmmeter
User and Service Manual
Copyright © 2005 IET Labs, Inc.
LOM-4000 im February, 2005
IET LABS, INC.
Standards • Decades • Strobes • Sound Level Meters • Bridges
www.ietlabs.com
534 Main Street, Westbury, NY 11590
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

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  • Page 1 ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT LOM-4000 SERIES Digital Ohmmeter User and Service Manual Copyright © 2005 IET Labs, Inc. LOM-4000 im February, 2005 IET LABS, INC. Standards • Decades • Strobes • Sound Level Meters • Bridges www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 •...
  • Page 3 IET specifications. If within one year after original shipment, it is found not to meet this standard, it will be repaired or, at the option of IET, replaced at no charge when returned to IET.
  • Page 4 WARNING OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. Dangerous voltages may be present inside this instrument. Do not open the case Refer servicing to qulified personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES (>...

  • Page 5: Table Of Contents

    Contents Chapter 1 INTRODUCTION ............................. 1 1.1 General Description ........................1 1.2 Theory of Operation ........................1 1.3 Case Design ............................ 1 1.4 Available Accessories ........................1 Chapter2 SPECIFICATIONS ............................ 2 2.1 General: ............................2 2.2 Measurement: ..........................2 Chapter 3 OPERATION ..............................
  • Page 6 Figures Figure 3.2 Combined current and potential probes (Kelvin clips) ............... 6 Figure 3.3 Connections for resistance measurements with various DUT configurations ........7 Figure 3.4 Connection Diagram for Pt100 plug (viewed from the rear) .............. 8...

  • Page 7: Chapter 1 Introduction

    Set of test leads Set of alkaline batteries Simple push-button or auto-range selection of the Operation Manual range required makes the LOM-4000 Series easy to Optional Lead Sets: use. Error and status warnings are illuminated when appropriate. The unit will withstand accidental appli- HSO1-P Duplex Handspikes with 2.5-meter...

  • Page 8: Chapter2 Specifications

    LOM-4000 Series Chapter 2 SPECIFICATIONS 2.1 General: 2.2 Measurement: Digital Display: Resistance: 4 digit, 0.6" high LCD, 4000 count with True four-terminal measurement with fixed automatic decimal point and polarity dc measuring currents indication; additional annunciator Measuring time: lamps. Approximately 20 ms for normal measurement,...

  • Page 9: Chapter 3 Operation

    LOM-4000 Series Chapter 3 OPERATION Display Mode LED’s (4001 only) Display Value LED (4001 only) Low Battery LED Calibration Units Indication 4000 Function Keys Operation...
  • Page 10 LOM-4000 Series " " % & ! ( ) + " , " ! ( ) " " " Operation...

  • Page 11: Initial Inspection

    LOM-4000 Series the AUTO key puts the instrument into the auto-range 3.1 Initial Inspection mode. After unpacking, inspect unit for shipping damage and 3.3.3 Error & Status Lamps report any problem immediately to the carrier, retain- ing packaging materials for inspection.

  • Page 12: Start-Up

    If the internal checks indicate an error, the display will read FAIL. Contact our Service Department or your IET Representative for assistance. 3.4.3 Measurement Connect the resistance to be measured (Rx) to the measuring terminals in accordance with the diagram on the instrument panel and using the most appropri- ate connection technique for the unknown (See Figs.

  • Page 13: Current Mode

    LOM-4000 Series Fig. 3.3 Connections for resistance measurements with various DUT configurations Measurements will continue until the MEAS key is with the current flowing in both directions and dis- pressed again. To preserve battery life, the unit will plays the average of the two readings. The AVE...

  • Page 14: Open-Circuit Lead

    LOM-4000 Series 3.4.6 Open-Circuit Lead exact type used. Always replace this fuse with one of the same current rating (1 A) and at least a 40,000 A interrupting capacity. If one of the test leads is open-circuited, or exceeds a preset resistance, the display will indicate “OC“.

  • Page 15: Chapter 4 Calibration

    4.1 Calibration Process 4.4.2 Entering a password, and Calibration This procedure describes the standard calibration 1. Turn the LOM-4000/1 on while holding down the method for the LOM-4000/1 Micro-ohmmeter using CAL key. The display will show CODE for a few...
  • Page 16 LOM-4000 Series 4.5.2 4.5.4 In all measurements the U + and - and the I + and Use the procedure of 4.4.1 above to perform the - terminals are connected to the equivalent terminals calibration using discrete standards. Replace the zero (usually marked “Sense”...

  • Page 17: Chapter 5 Maintenance

    If a failure occurs, or if the unit cannot be calibrated, NFC 63210, Altech 1C10x38G1 it should be returned to IET or to an IET representa- or Cooper Bussman KTK-1 tive. Contact IET for an RMA number before return- ing the unit directly to IET.

This manual is also suitable for:

Lom-4001

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