Amprobe MO-100 Manuel utilisateur

Users Manual

MO-100

Milliohm Meter

For detailed specifications and ordering info go to www.TestEquipmentDepot.com

MO-100

Milliohm Meter

Users Manual

July 2009, Rev.1

English

Limited Warranty and Limitation of Liability

Your Amprobe product will be free from defects in material and workmanship for 1 year from the

date of purchase. This warranty does not cover fuses, disposable batteries or damage from accident,

neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling. Resellers

are not authorized to extend any other warranty on Amprobe’s behalf. To obtain service during the

warranty period, return the product with proof of purchase to an authorized Amprobe Test Tools

Service Center or to an Amprobe dealer or distributor. See Repair Section for details. THIS WARRANTY

IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES - WHETHER EXPRESS, IMPLIED OR STAUTORY -

INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY,

ARE HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,

INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY.

Since some states or countries do not allow the exclusion or limitation of an implied warranty or of

incidental or consequential damages, this limitation of liability may not apply to you.

Repair

All test tools returned for warranty or non-warranty repair or for calibration should be accompanied

by the following: your name, company’s name, address, telephone number, and proof of purchase.

Additionally, please include a brief description of the problem or the service requested and include

the test leads with the meter. Non-warranty repair or replacement charges should be remitted in the

form of a check, a money order, credit card with expiration date, or a purchase order made payable to

Amprobe® Test Tools.

In-Warranty Repairs and Replacement – All Countries

Please read the warranty statement and check your battery before requesting repair. During the

warranty period any defective test tool can be returned to your Amprobe® Test Tools

distributor for an exchange for the same or like product.

Non-Warranty Repairs and Replacement – US and Canada

Non-warranty repairs in the United States and Canada should be sent to a Amprobe® Test Tools

Service Center. Call Amprobe® Test Tools or inquire at your point of purchase for current repair

and replacement rates.

Over Temperature indicator. Lit = Over-temperature or test stopped.

Resistance between the current leads too high (fuse!).

Resistance between the potential leads too high.

Current Injection Terminals

Meet LVD & EMC requirement

Rotary Selector Switch

Potential Injection Terminals

Liquid Crystal Display

Start / Stop Test

MO-100

Milliohm Meter

3 4 5

CAUTION!

If “NO TEST” LED lit, the current source is stopped.

MO-100

Milliohm Meter

CONTENTS

SYMBOLS...............................................................................................................2

CAUTIONS AND PRECAUTIONS ...........................................................................2

UNPACKING AND INSPECTION ............................................................................3

INTRODUCTION .....................................................................................................4

OPERATION............................................................................................................6

Preparation For Use .........................................................................................6

Check the Battery .............................................................................................6

Check the Current Regulation .........................................................................6

Check the Voltage Measurement ....................................................................6

Measuring .........................................................................................................7

Test Leads ..........................................................................................................8

Supplied Potential Test Leads ..........................................................................8

Supplied Current Test Leads ............................................................................8

Thermal Effects .................................................................................................9

SPECIFICATION ......................................................................................................10

Electrical ...........................................................................................................10

Mechanical .......................................................................................................10

Rated environmental conditions .....................................................................11

MAINTENANCE AND REPAIR ................................................................................12

Battery Replacement .......................................................................................12

Fuses Replacement ...........................................................................................13

SYMBOLS

Caution ! Refer to the explanation in this Manual

Caution, Risk of Electric Shock

Please remove all the test leads before performing maintenance,

cleaning, battery replacement, fuse replacement, etc

Conforms to relevant Australian standards

Complies with European Directives

Do not dispose of this clamp meter as unsorted municipal waste.

Contact a qualiﬁed recycler for disposal.

WARNING!

Do not operate this instrument in the presence of gasoline, natural gas,

propane, or in other combustible atmospheres.

CAUTIONS AND PRECAUTIONS

Refer to this manual before using the meter

• This instrument should only be used by a competent, suitably trained

person which fully understand the test & measurement procedure.

• Read the User’s manual carefully and completely before using the

instrument. Fully understand the instructions before using this product.

Follow the instructions for every test. Take all the necessary precautions.

Do not exceed the limits of this instrument.

• The tested circuit must be de-energised and isolated before connections

are made to it.

• Do not use test leads, probes or crocodiles/aligators clips that are dirty,

damaged or have broken or cracked insulation. Such accessories should

be removed and repaired Immediately.

• Always disconnect the test leads before replacing any fuse or battery.

• Always replace the fuse with same type and rating; ensure that they are

correctly ﬁtted on fuse terminals.

• Double check the switch settings and leads connections before

measuring. Make a sketch to ensure proper operation and principle of

measurement is correct and well understood.

• Do not touch any exposed wiring, connections or other “live” parts of

an electrical circuit. If in doubt, check the circuit ﬁrst for voltage before

touching it.

Precautions

• Always ensure that the circuit to be measured is switched “OFF”,

isolated and completely de-energized before connecting the test leads.

• If it is probable that the instrument’s protection has been impaired due

to electrical, mechanical or environmental damage, it must not be used.

It should be returned to your nearest distributor or agent for checking

and repair.

• To prevent damage to the liquid crystal display, the minimum storage

temperature of -20°C must be observed. It should also be noted that

below 0°C the operation of the LCD will be sluggish

Warning, risk of electric shock.

UNPACKING AND INSPECTION

Your shipping carton should include:

1 MO-100 Milliohm Meter

1 Shoulder Belt

1 Test Lead (Green Color)

1 Test Lead (Red Color)

1 Test Lead (Blue Color)

1 Test Lead (Black Color)

8 Alkaline Battery (SIZE AA, 1.5V)

1 Spare Fuse (0.5A/ 250V)

1 User’s Manual

If any of the items are damaged or missing, return the complete package to

the place of purchase for an exchange.

INTRODUCTION

• The Milliohm Meter is a battery operated instrument wich supply

a low current to the circuit under test, with which, stable, accurate

measurement of low resistance can be made, still, over a wide range of

values.

• Resolution on the lowest range is 100μ ohm and on the highest range,

1 ohm.

• The meter has 5 measuring ranges, from 200.0 milli-ohm to 2000 ohms

• Measurements are displayed on a 3½ digit custom liquid crystal display

with large digits.

• This instrument is powered from batteries only (alkaline or rechargeable

equivalent).

• It has a regulated DC constant current source with current of 1mA 10mA

and 100mA.

• The instrument supply that current to the resistance being measured

through the C1 and C2 terminals (C1 being +, C2 being -).

• The voltage drop across the resistance under test is measured by the

potential terminals P1 and P2 (P1 being +, P2 being -).

• Should the current regulation drops out, the Rc LED will lit, indicating

that the resistance in the current circuit is too high. (Lowering the

current by selecting a higher resistance range can solve the regulation.)

• Should the Rp LED lit, that mean that the voltage measured on the

resistance is too high, and therefore over-range.

• The resistance is measured precisely when the RP and RC LEDs do not lit.

If anyone of these leds lit, then the measurement can be inaccurate.

• The meter has a built-in custom 3½ digit liquid crystal display can

be viewed in most lightning conditions. This display indicates the

differences conditions (Hold, m, buzzer, polarity condition of load, + or -,

automatic decimal point change).

• The instrument takes measurements for 10 seconds if the “ON” “TEST

Re button is depressed for less than 2 seconds. If the same push button is

pressed for more than 3 seconds, the test will carry on for 60 seconds.

• The tester switch “OFF” completely when the rotary switch is in the

“OFF” position.

• The tester “Hold” the last reading before stopping the test.

• The tester is fuse protected and has a crowbar between C1 and C2.

• This crowbar is activated by voltage. If the voltage is too high, that

crowbar will blow the fuse automatically to interrupt the circuit.

• The voltage between P1 and P2 is also protected for over voltage but

does not have a fuse.

• The tester has a temperature shut down. The temperature sensing is

done on the current regulation transistor.

• Should this over-temperature LED lit, allow the instrument to cool down

for a while before proceeding further.

• The milliohm meter, with its measuring range of 100u ohms to 2000

ohms, is suitable for a wide range of applications such as:

1. Measuring the winding resistance of electric motors, generators and

transformers.

2. Bond testing in mines, aircraft, railways, ships, domestic andindustrial

wiring installations.

3. Measuring the ring main continuity testing in industrial and domestic

wiring installations

4. Measuring resistance in electronic equipment such as shunts, pcb

tracks, switch and relay resistance.

5. Checking compression joints on overheads lines.

6. Testing and maintenance of switchboard /sub-station equipment on

such items as fuses, joints, contacts and bonds.

OPERATION

Preparation For Use

When unpacked, the tester should be inspected for any visible signs of

damage, and the preliminary checks described in the user’s manual should

be performed to ensure that it is operating correctly. If there is any sign of

damage, or if the instrument does not operate correctly, return it to your

nearest supplier.

Check the Battery

If the battery symbol is shown on the LCD, then replace the batteries with new

alkalines batteries before proceeding.

Check the Current Regulation

• Connect the current leads to C1 and C2.

• Select a range, and short the current test leads. The RC led should go off,

indicating that the current regulation is ok.

Check the Voltage Measurement

• Connect the potential leads to P1 and P2.

• Short the P1 and P2. The display should indicate 0000.

• Remove the short from P1 and P2and C1 and C2. Touching the potential

test leads P1 to C1 and P2 to C2, the RP led should lit, indicating an over-

voltage or over-range.

This proving test can be repeated on all the ranges if need be.

You can also check the polarity indication of the milli-voltmeter by touching

the potential test leads P1 to C2 and P2 to C1, the RP LED should lit, indicating

an over-voltage or over-range. The - indicator should be indicating - on the

LCD, showing the polarity change.

Total check can be done by shorting all the test leads together C1, C2, P1, P2.

The display should indicate close to 0000 (depending of the crocodiles clips

used and how they are shorted). Both RC and RP LED should be OFF, indicating

that everything work ok.

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