Martindale Electric MM68 Manual de usuario
MM68 MULTIMETER
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)
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
CONTENTS
1 Introduction 1
1.1 Inspection 1
1.2 Description 1
1.3 Accessories 1
1.4 Battery Installation
2 Product Specific Safety Information 3
2.1 Precautions 3
3 Operation 5
3.1 General 5
3.2 Low Battery Indication 5
3.3 Description of Terminals 5
3.4 Description of Press Buttons 6
3.5 Description of LCD Symbols 6
3.6 Auto Power Off 6
3.7 Max/Min 7
3.8 Relative Function 7
3.9 Backlight 7
3.10 Manual Range Selection 7
3.11 AC & DC Voltage Measurement 8
3.12 AC & DC Current Measurement 8
3.13 Resistance Measurement 8
3.14 Capacitance Measurement 9
3.15 Frequency Measurement 9
3.16 Duty Cycle Measurement 9
3.17 Continuity Testing 10
3.18 Diode Testing 10
4 Maintenance 11
4.1 Battery Replacement 11
4.2 Fuse Replacement 11
4.3 Test Lead Replacement 11
4.4 Calibration 12
4.5 Cleaning 12
4.6 Repair & Service 12
4.7 Storage Conditions 12
5 Warranty 13
Specifications
Specification
MM68
Digital Multimeter
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 MM68 is a 4½ digit multimeter with the following
measurement functions:
uTrue rms AC voltage to 750V
uDC voltage to 1000V
uTrue rms AC current to 10A
uDC current to 10A
uResistance to 220M
Ω
uCapacitance to 22mF
uFrequency to 22MHz
uContinuity with audible indication
uDiode testing
uDuty cycle
Further functions are:
uMax/Min indication
uAuto power off
uDisplay backlight
uRelative function
uAuto ranging
uIncorrect connection warning
1.3 Accessories (included)
uTL16 test leads
uSpare 0.5A/500V, fast acting ceramic fuse
u9V battery (installed)
uInstructions
1
1.4 Battery Installation
Refer to section 4.1 (Battery Replacement) for the battery
installation instructions for the MM68.
2
Specification
MM68
Digital Multimeter
2. PRODUCT SPECIFIC SAFETY INFORMATION
Measurement Category II (CAT II) is applicable to test and
measuring equipment connected directly to utilization points
(socket outlets and similar points) of the low-voltage MAINS
installation.
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.
Measurement Category IV (CAT IV) is applicable to test and
measuring equipment connected at the source of the building’s
low-voltage 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.
3
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
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.
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.
4
Specification
MM68
Digital Multimeter
3. OPERATION
3.1 General
If the multimeter does not measure capacitance or 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 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
1000V, 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 220 mA and capacitance
measurements.
10A Input terminal for AC & DC current
measurements to 10A
COM Common terminal for all measurements
5
% Hz V½Input terminal for AC & DC voltage, resistance,
continuity, diode, frequency and duty cycle
measurements
3.4 Description of Press Buttons
RANGE Switches between auto and manual ranging
MAX/MIN Selects maximum/minimum function
Turns on/off the backlight
Selects the relative function
Hz % Selects the frequency and duty cycle functions
3.5 Description of LCD Symbols
APO Auto power off is active
RANGE Manual ranging is selected
Diode testing function is selected
Continuity function is selected
Relative function is selected
MAX Maximum indication is selected
MIN Minimum indication is selected
%, mV, V, A, nF, Unit of measurement being displayed
μF, mF,
Ω
, k
Ω
,
M
Ω
, Hz, kHz
Indicates battery is low
DC Indicates DC measurement
AC Indicates AC measurement
3.6 Auto Power Off
The MM68 will auto power off after approximately 30 minutes.
Pressing any button will turn the MM68 back on.
6
To deactivate the auto power off function press and hold the
RANGE button while simultaneously turning the MM68 function
switch from OFF to any position. The APO annunciator will no
longer be displayed.
3.7 Max/Min
To select the Max/Min function press the MAX/MIN button.
Alternate between displaying the maximum and minimum
measured values by pressing the MAX/MIN button.
To exit the Max/Min function hold down the MAX/MIN button for 2
seconds.
3.8 Relative Function
The relative function can be used to remove an offset/residual
value from a measurement.
To select the relative function press the button to store the
offset/residual value. This will now be removed from all
consequent readings while the relative function is selected.
Press the button again to exit the relative function.
3.9 Backlight
Press the button to turn on/off the backlight.
The backlight will automatically turn off after approx 4½ minutes.
3.10 Manual Range Selection
The MM68 powers up in autoranging mode.
To manually select a range press the RANGE button to hold the
present range, then continue to press the RANGE button until
the required range is selected. The sequence is lowest range to
highest then directly back to lowest.
7
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