Amprobe MO-100 Manuel utilisateur
MO-100
Milliohm Meter
Users Manual
July 2009, Rev.1
©2009 Amprobe Test Tools.
All rights reserved. Printed in Taiwan
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.
1
3
5
Current Injection Terminals
Meet LVD & EMC requirement
Rotary Selector Switch
2
4
6
Potential Injection Terminals
Liquid Crystal Display
Start / Stop Test
MO-100
Milliohm Meter
1
3 4 5
2
6
CAUTION!
If “NO TEST” LED lit, the current source is stopped.
1
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
2
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.
3
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.
4
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.
5
• 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.
6
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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