Martindale MM65 User Manual

MM65 MULTIMETER

Thank you for buying one of our products. For safety and full
understanding of its benefits please read this manual before
use. Technical support is available from 01923 441717 and
[e-mail].

CONTENTS

1 Introduction 1

1.1 Inspection 1

1.2 Description 1

1.3 Accessories 1

1.4 Battery Installation 1
2 Product Specific Safety Information 2

2.1 Precautions 2
3 Operation 4

3.1 General 4

3.2 Low Battery Indication 4

3.3 Description of Terminals 4

3.4 Description of Press Buttons 5

3.5 Description of LCD Symbols 5

3.6 Auto Power Off 5

3.7 Manual Range Selection 5

3.8 Data Hold 6

3.9 AC & DC Voltage Measurement 6

3.10 AC & DC Current Measurement 6

3.11 Resistance Measurement 7

3.12 Continuity Testing 7

3.13 Diode Testing 7
4 Maintenance 9

4.1 Battery Replacement 9

4.2 Fuse Replacement 9

4.3 Test Lead Replacement 9

4.4 Calibration 10

4.5 Cleaning 10

4.6 Repair & Service 10

4.7 Storage Conditions 10

5 Warranty 11

Specifications

INSTRUCTION
MANUAL

GENERAL SAFETY INFORMATION: Always read before proceeding.

Warning
These instructions contain both information and warnings that are
necessary for the safe operation and maintenance of this product. It is
recommended that you read the instructions carefully and ensure that the contents
are fully understood. Failure to understand and to comply with the warnings and
instructions can result in serious injury, damage or even death.

In order to avoid the danger of electrical shock, it is important that proper safety
measures are taken when working with voltages exceeding 30V AC RMS, 42V AC
peak or 60V DC.

This product must only be used by a competent person capable of interpreting the
results under the conditions and for the purposes for which it has been
constructed. Particular attention should be paid to the Warnings, Precautions and
Technical Specifications. Always check the unit is in good working order before
use and that there are no signs of damage to it. Do not use if damaged.

Where applicable other safety measures such as use of protective gloves, goggles
etc. should be employed.

Please keep these instructions for future reference. Updated instructions and
product information are available at: www.martindale-electric.co.uk

REMEMBER: SAFETY IS NO ACCIDENT

MEANING OF SYMBOLS:

Equipment complies with relevant EU Directives

Caution - risk of danger & refer to instructions

Caution - risk of electric shock

Equipment protected by double or reinforced insulation (Class II)

End of life disposal of this equipment should be
in accordance with relevant EU Directives

Direct current (DC)

Alternating current (AC)

Earth (ground)

1. INTRODUCTION

1.1 Inspection

Examine the shipping carton for any sign of damage. Inspect the
unit and any accessories for damage. If there is any damage then
consult your distributor immediately.

1.2 Description

The MM65 is a 3

 AC & DC voltage to 600V
 AC & DC current to 10A
 Resistance to 34MΩ
 Continuity with audible indication
 Diode testing

¾ digit multimeter with the following functions:

Further functions are:

 Auto power off
 Auto ranging
 Data hold
 Incorrect connection warning

1.3 Accessories (included)

 TL16 test leads
 Magnetic strap
 Spare 0.5A/500V, fast acting ceramic fuse
 9V battery (installed)
 Instructions

1.4 Battery Installation

Refer to Section 4.1 (Battery Replacement) for the battery
installation instructions for the MM65.

1

2. PRODUCT SPECIFIC SAFETY INFORMATION

2

3

Measurement Category III (CAT III) is applicable to test and
measuring equipment connected to the distribution part of the
building’s low-voltage MAINS installation.

Warning

Always test this unit on an appropriate proving device or known
voltage source before and after using it to determine if a
hazardous voltage exists in a circuit to be tested.

Measurement Category IV (CAT IV) is applicable to test and
measuring equipment connected at the source of the building’s low­voltage MAINS installation.

2.1 Precautions

This product has been designed with your safety in mind, but
please pay attention to the following warnings and cautions before
use.

Warning

Before use check the unit for cracks or any other damage. Make
sure the unit is free from dust, grease and moisture. Also check any
associated leads and accessories for damage. Do not use if
damaged.

Warning

Do not use if the battery/fuse cover is not fitted.

Warning

When this unit is used in combination with test leads, the
measurement category of the combination is the lower
measurement category of either this unit or the test leads used.
Likewise, if test lead accessories such as crocodile clips are also
used, the measurement category will be the lowest measurement
category in that combination.

Warning

When using test leads, always keep your fingers behind the finger
guard on the test lead probe.

Warning

Measuring a voltage that exceeds the specified limits of the unit
may damage the unit and expose the operator to a shock hazard.
Always check the unit’s specified limits before use.

Caution

Avoid severe mechanical shock or vibration and extreme
temperature.

3. OPERATION

3.1 General

If the multimeter does not measure current on the μA/mA ranges,
the internal fuse (F1) may have blown (see section 4.2 Fuse
Replacement).

If the multimeter does not measure current on the 10A range the
internal fuse (F2) may have blown (see section 4.2 Fuse
Replacement).

If the magnitude of a parameter to be measured is unknown, but
known to be within the maximum safe limits of the multimeter, then
manually set the range to maximum. For example, if measuring DC
voltage and the voltage magnitude is unknown, set the range to
600 V, then if required select autoranging for a satisfactory
reading.

If a test lead is connected to the wrong input socket when a
voltage range is selected then a warning buzzer will sound.

If the multimeter displays OL or -OL then the measurement limits
of the range have been exceeded.

3.2 Low Battery Indication

If the symbol is displayed then the battery needs replacing
(see section 4.1 Battery Replacement).

3.3 Description of Terminals
μA mA Input terminal for AC & DC current

measurements to 340mA

10A Input terminal for AC & DC current

measurements to 10A

COM Common terminal for all measurements
VΩ Input terminal for AC & DC voltage, resistance,

continuity and diode measurements

3.4 Description of Press Buttons
RANGE Switches between auto and manual ranging
HOLD Turns on/off the data hold function

3.5 Description of LCD Symbols
APO Auto power off is active
HOLD Data hold function is selected
RANGE Manual ranging is selected

Continuity function is selected

Diode testing function is selected

mV, V, μA, mA, Unit of measurement being displayed
A, Ω, kΩ, MΩ

Indicates battery is low

DC Indicates DC measurement
AC Indicates AC measurement

3.6 Auto Power Off

The MM65 will auto power off after approximately 10 minutes.
Pressing any button will turn the MM65 back on.

To deactivate the auto power off function press and hold the
RANGE button while simultaneously turning the MM65 function
switch from OFF to any position. The APO annunciator will no
longer be displayed.

3.7 Manual Range Selection

The MM65 powers up in auto rangeing mode.

4

5