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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
Operation Manual
MODEL LOM-510A
High Accuracy
Micro-Ohmmeter
User and Service Manual
Copyright © 2019 IET Labs, Inc.
LOM 510A im/Dec. 2019
IET LABS, INC.
www.ietlabs.com
Email: info@ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
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Related Manuals for IET Labs LOM-510A
Summary of Contents for IET Labs LOM-510A
- Page 1 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT Operation Manual MODEL LOM-510A High Accuracy Micro-Ohmmeter User and Service Manual Copyright © 2019 IET Labs, Inc. LOM 510A im/Dec. 2019 IET LABS, INC. www.ietlabs.com Email: info@ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
- Page 2 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT IET LABS, INC. www.ietlabs.com Email: info@ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
- Page 3 LOM-510A Series WARRANTY We warrant that this product is free from defects in material and workmanship and, when properly used, will perform in accordance with applicable 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.
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Page 4: Table Of Contents
LOM-510A Series Contents WARRANTY ...................iii WARNING ....................v CAUTION ....................v Chapter 1 INTRODUCTION ................1 Chapter 2 SPECIFICATIONS ................. 2 2.1 Drive Specifications ............... 2 2.2 Performance Specifications ........... 2 Chapter 3 OPERATION ................... 3 3.1 General Operating Instructions ..........3 3.2 Continuous DC Mode ............ -
Page 5: Warning
LOM-510A Series WARNING OBSERVE ALL SAFETY RULES ‘WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. ELECTRICAL SHOCK HAZARD. DO NOT OPEN CASE. REFER SERVICING TO QUALIFIED PERSONNEL. HIGH VOLTAGE MAY BE PRESENT WITH HIGH VOLTAGE OPTIONS. WHENEVER HAZARDOUS VOLTAGES (> 45 V) ARE USED, TAKE ALL MEASURES TO... - Page 6 LOM-510A Series...
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Page 7: Chapter 1 Introduction
LOM 510A Series Chapter 1 Introduction The Model 510A Micro-ohmmeter is a high perfor- the resistance of highly inductive components such mance instrument, useful wherever there is a need for as transformers. The Pulsed Mode is important when measuring very low values of resistance. The highest measuring heat sensitive components such as ther- range of 200 ohms full scale on the Model 510A is mistors. -
Page 8: Chapter 2 Specifications
LOM 510A Series Chapter 2 Specifications 2.1 Drive Specifications Pulsed Mode: One cycle of Switched DC Mode. Enabled by shorting two contacts on rear panel connector. Range POWER POWER ENERGY Dry Circuit: Drive RESOLUTION (Full Scale) SW DC PULSED Open circuit voltage limited to 50 millivolts max. 19.999 m ... -
Page 9: Chapter 3 Operation
LOM 510A Series Chapter 3 Operation 3.1 General Operating Instructions. 4. Select the proper resistance range by pushing in the appropriate range button. Very often the correct range can’t be determined in ad- 1. Plug the power cord into the rear panel AC vance. -
Page 10: Pulsed Mode
LOM 510A Series brated current source flowing through the unknown. The Pulsed Mode should be used when the compo- The displayed reading is the difference between the nent to be measured is extremely temperature sensi- two measurements. tive, such as in the case of small bead thermistors. The Pulsed Mode is the only way to externally trig- The Switched DC Mode is the appropriate drive mode ger the Model 510A. -
Page 11: Circuit Descriptions
LOM 510A Series Chapter 4 Circuit Descriptions 4.1 Power Supply The test leads can easily pick up line related noise orders of magnitude greater than this. The power supply produces 3 regulated DC voltages, The AC voltage at the transformer secondary is con- namely +5 V DC, +8 V DC and -SVDC. -
Page 12: Component Drive Circuitry
LOM 510A Series holding the timing circuitry in reset. In the Continu- When the “DRY CKT” button is (S8) depressed the ous DC Mode switch S2 inhibits the auto zero, forc- voltage at the output of U4 is sensed. When this volt- ing a constant current to flow continuously through age exceeds approximately 3 volts U29 becomes posi- the unknown. -
Page 13: Display Circuitry
LOM 510A Series iting to the DVM circuit during open circuit. S2-C To facilitate zeroing the meter when in the Continu- and R24 discharge C4 in the Continuous DC Mode. ous DC Mode segment “g” (the center horizontal seg- ment) is driven when the polarity to the DVM circuit R22 in conjunction with R40 is used to zero the meter reverses. -
Page 14: Chapter 5 Calibration
LOM 510A Series Chapter 5 Calibration Danger !!! 2. Reattach the line cord and turn the instrument The calibration procedure requires that the top cover on. Allow the instrument to stabilize for 5 of the instrument be removed. This exposes the op- minutes before proceeding.
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