Phenix Technologies MRM-100 Manuel utilisateur

Users Manual

Phenix Technologies Inc.

MICRO-OHMMETER

MODEL NUMBER MRM-100

Version 1.1

DK/ELL/LEO/slu

May, 2004

TABLE OF CONTENTS

Section Number

GENERAL SAFETY PRECAUTIONS

PRODUCT INFORMATION 1

-SAFETY AND CAUTION NOTES

-SPECIFICATIONS

-INTRODUCTION / THEORY OF OPERATION

CONTROLS AND INDICATORS 2

ELECTRICAL SET-UP 3

MRM MENU TREE 4

STARTING SCREENS 4-1

PERFORMING TESTS 4-2

SAVED RESULTS 4-6

SYSTEM SETUP 4-8

OPERATING INSTRUCTIONS 5

UNIT UNDER TEST 5-1

METER CHECK 5-2

TROUBLESHOOTING OPERATIONAL PROBLEMS 6

STORAGE OF EQUIPMENT 7

MAINTENANCE 8

RECOMMENDED SPARE PARTS 9

MRM-100 PARTS LIST 10

PARTS ORDERING INFORMATION 11

RETURNED MATERIAL 12

ELECTRICAL DIAGRAMS 13

1-1

PRODUCT INFORMATION





CAUTION: Contact with the test leads on this equipment can cause

harmful electrical shock. Do not touch test leads while a test is in process.

SAFETY AND CAUTION NOTES

1. Contact with the test leads on this equipment can cause harmful electrical shock. Do not

touch test leads or test object while a test is in process.

2. Insure the micro-ohmmeter is properly grounded through the power cord before proceeding

with a test.

3. Turn the micro-ohmmeter off and unplug power cord before reaching inside. Damage to the

tester and hazardous shock to personnel will result if this procedure is not followed.

4. Insure that the equipment to be tested is de-energized and properly isolated.

5. Use care to avoid damaging the micro-ohmmeter during disassembly and re-assembly

procedures.

6. This unit should only be operated by someone familiar with high current testing and safety

procedures.

Phenix Technologies, Inc. assumes no liability for unsafe or improper use of test equipment.

1-2

PRODUCT SPECIFICATIONS

Input:

100 to 240 VAC, 50/60 Hz, single phase, 5 Amps.

Resistance Measurement Range:

1µΩ to 240mΩ, non-inductive.

Test Current:

10 to 105 Amps, selectable in 1 Amp steps.

Uncertainty:

+/- 1% of reading, +/- 0.4µΩ at 100 Amps or +/-4µΩ at 10 Amps.

Resolution:

1µΩ to 199µΩ: 0.1µΩ

200µΩ to 1999µΩ: 1µΩ

2.00mΩto 19.99mΩ: .01mΩ

20.0mΩto 240.0mΩ: 0.1mΩ

Termination:

30 foot cables with alligator clamps. C clamps are also available

Keyboard:

10 number keys, 26 letter keys, and 14 function keys.

Control:

Embedded microprocessor

Display:

4 X 20 LCD screen

Computer Port:

RS-232 ASCII Commands

Memory:

The MRM-100 can store up to 300 measurements in memory.

Type of Cooling:

Two cooling fans

Uncertainty Temperature Range:

18°C to 27°C (64°F to 81°F)

Operating Ambient Temperature:

-7°C to 45°C (19°F to 113°F)

Storage Temperature:

-20°C to 57°C (-4°F to 135°F)

Dimensions:

16.5” W x 15.25” D x 11.25” H (419 mm W x 388 mm D x 286 mm H)

Weight:

Unit: 28.5 lbs. (13 kg)

Cables/ Bag/Accessories: 19.5 lbs. (8.8 kg)

1-3

INTRODUCTION

The MRM-100 is a portable micro-Ohmmeter used to test circuit breaker

contact resistance, or anywhere low resistance measurements at currents up to

just over 100 Amps are required. The MRM-100 uses a low voltage, high current

power supply to run a user-defined test current of between 10 Amps to 105

Amps to any resistive load that requires no more than 2.5 Volts across it to test.

The MRM-100 does detect if the test is able to reach desired current, and allows

for immediately stopping the test.

THEORY OF OPERATION

The MRM-100 uses a two-voltmeter method where each voltage reading

implements a four-wire Kelvin connection. One voltmeter monitors the voltage

across a known, highly stable shunt that passes the test current through it, while

the other voltmeter monitors the voltage across the unit under test. A test

current is then applied (see ANSI C37.09 and IEC 62771-100 for test current

requirements). This current is ramped up, held for a period of time and then

ramped down. While the current is relatively constant, the voltages across the

known resistance and unit under test are amplified and filtered. Then they are

sampled several times by analog to digital converters to reduce any noise, and

processed by a microcontroller. The microcontroller calculates the ratio between

the test current and sensed voltage to determine the resistance. The micro-

Ohmmeter is designed to test resistances of 1 micro-Ohm to 240 milliohms.

2-1

CONTROLS AND INDICATORS

1. AC Line Cord Input Connector:

Plug into a suitable grounded receptacle. See specifications for voltage and current

requirements.

2. Main Power Switch:

Turning the switch On / Off energizes or de-energizes the MRM.

3. RS-232 Port:

This port allows communication with a Personal Computer for data acquisition and remote

control, when supported by appropriate optional software.

4. LCD Display:

This 4x20 Character display, shows all relevant information during testing and setup.

5. Keypad:

This keypad is used to enter test parameters.

6. Built In Printer:

The built in dot matrix printer is designed to print test results immediately or to provide a

printout of saved tests.

SERIAL I/O

AC INPUT

MODEL MRM-100





Space

A S

Esc

235

Enter





Start Stop





SENSE

OFF ON

CURRENT

HIGH

MRM-100



















PHENIX



TECHNOLOGIES

RS-232

OUTPUTS





2-2

CONTROLS AND INDICATORS (Continued)

7. High Current Output Connection

This receptacle is for connection of the high current output leads.

8. Output Energized Indicator:

This indicator illuminates under any of the following conditions:

a. A test is in progress.

No test cables should be connected, disconnected or handled while this light is on.

9. Output Sense Lead Connection:

This receptacle is for connection of the sense leads required for the four wire measurement.

3-1

ELECTRICAL SET-UP

Line / Generator Powered Operation

Locate the desired location for the test set. Prepare the main power input cable for plugging into

the proper facility or generator power. Leave plug unconnected at this time. Ensure that generator

is properly grounded with facility ground or ground (earthing) rod.

Measurement Lead Connection

WARNING: Main power switch on front panel must be in the OFF position before

proceeding. Insure test specimen is de-energized, discharged, and properly isolated!

1. Connect the measurement cables with red leads to the positive terminal (if applicable) of the

unit under test.

2. Connect the measurement cables with black leads to the negative terminal (if applicable) of

the unit under test.

3. Connect the input main power cable to appropriate power source if powering with line power.

Note: Specimen connection points for test cables must be clean and corrosion free. Any

contamination at connection points may result in errant readings.

4-1

MRM MENU TREE

STARTING SCREENS

MRM START UP SCREEN

Press any key (except “Esc”) to proceed.

TEST OPERATOR ID SCREEN

Operator identification may be entered here and is shown on printouts as

well as saved tests. Leave blank if not wanted for test. To delete the

existing entry, move cursor to the left with left arrow and use delete key.

MRM MAIN MENU

The following numbers are keyed to the screen shot above.

1) If “1” is pressed, a test setup is begun.

2) If “2” is pressed, the operator identification can be altered.

3) If “3” is pressed, saved results can be recalled.

4) If “4” is pressed, the meter itself can be set up.

5) If “1” is pressed, the following screen is displayed.

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