MARTINDALE MM84 User manual

MM84 MULTIMETER
Instruction
Manual
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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
End of life disposal of this equipment should be
in accordance with relevant EU Directives
Caution - risk of electric shock
Caution - risk of danger & refer to instructions
Equipment protected by double or reinforced insulation (Class II)
Direct current (DC)
Alternating current (AC)
Earth (ground)
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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
11 Introduction 1
1.1 Inspection 1
1.2 Description 1
1.3 Accessories 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 4
3.5 Description of LCD Symbols 5
3.6 Incorrect Connection Warning 5
3.7 Auto Power Off 5
3.8 Data Hold 5
3.9 AC & DC Voltage Measurement 5
3.10 AC & DC Current Measurement 6
3.11 Resistance Measurement 6
3.12 Frequency Measurement 6
3.13 Duty Cycle Measurement 6
3.14 Continuity Testing 7
3.15 Diode Testing 7
3.16 Logic Testing 7
4 Maintenance 8
4.1 Battery Replacement 8
4.2 Fuse Replacement 8
4.3 Test Lead Replacement 9
4.4 Calibration 9
4.5 Cleaning 9
4.6 Repair & Service 9
4.7 Storage Conditions 10
5 Warranty 10
Specifications
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1
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 MM84 is a 4½ digit multimeter with the following functions:
True rms AC voltage to 750V
DC voltage to 1000V
True rms AC current to 20 A
DC current to 20A
Resistance to 20M:
Frequency to 200kHz
Continuity with audible indication
Diode testing
Duty cycle
Logic test
Further functions are:
Data hold
Auto power off
Incorrect connection warning
1.3 Accessories (included)
TL16 test leads
Holster
9V battery (installed)
Instructions
1.4 Battery Installation
Refer to section 4.1 (Battery Replacement) for the battery
installation instructions for the MM84.
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2
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.
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 rear casing 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
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.
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3
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.
Caution
Remove the batteries when not in use for an extended period, to
avoid corrosion from leaking batteries.
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4
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 20A 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
1000V, then if required select autoranging for a satisfactory reading.
If the multimeter displays 1 with all other digits remaining blank 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
20A Input terminal for AC & DC current measurements to 20A
μA mA Input terminal for AC & DC current measurements to 200mA
COM Common terminal for all measurements.
Input terminal for AC & DC voltage, resistance, continuity,
V:Hz diode, frequency, duty cycle and logic measurements.
3.4 Description of Press Buttons
POWER Switches on/off the MM84
DATA HOLD Activates/deactivates the data hold function
}
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3.5 Description of LCD Symbols
Diode testing function is selected
HAuto hold is selected
LOGIC Logic function is selected
%Duty cycle function is selected
mV, V, Units of measurement being displayed
μA, mA,
:, k:,
M:, kHz
Indicates battery is low
AC Indicates AC measurement range selected
DC Indicates DC measurement range selected
3.6 Incorrect Connection Warning
If a test lead is connected to the μA mA or 20A input sockets when a
voltage range is selected then a warning buzzer will sound.
3.7 Auto Power Off
The MM84 will auto power off after approximately 45 minutes of
inactivity.
3.8 Data Hold
To hold a displayed value press the DATA HOLD button. The LCD will
display H.
To exit display hold press the DATA HOLD button again.
3.9 AC & DC Voltage Measurement
Connect the black test lead to the COM terminal and the red test lead
to the %HzV:terminal.
Set the rotary switch to either V~or V and the required range.
Taking all necessary safety precautions connect the test leads to the
circuit being measured and read the measured voltage from the display.
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6
3.10 AC & DC Current Measurement
Connect the black test lead to the COM terminal and the red test lead
to the μA mA or 20A terminal depending on the magnitude of current
to be measured.
Set the rotary switch to either Aor Aand the required range.
Taking all necessary safety precautions connect the test leads in
series with the circuit being measured and read the measured current
from the display.
3.11 Resistance Measurement
Connect the black test lead to the COM terminal and the red test lead
to the %HzV:terminal.
Set the rotary switch to :and the required range.
Taking all necessary safety precautions connect the test leads to the
circuit being measured and read the measured resistance from the
display.
3.12 Frequency Measurement
Connect the black test lead to the COM terminal and the red test lead
to the %HzV:terminal.
Set the rotary switch to Hz and the required range.
Taking all necessary safety precautions connect the test leads to the
circuit being measured and read the measured frequency from the
display.
3.13 Duty Cycle Measurement
Connect the black test lead to the COM terminal and the red test lead
to the %HzV:terminal.
Set the rotary switch to DUTY%.
Taking all necessary safety precautions connect the test leads to the
circuit being measured and read the measured % duty cycle from the
display.
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3.14 Continuity Testing
Connect the black test lead to the COM terminal and the red test
lead to the %HzV:terminal.
Set the rotary switch to .
Taking all necessary safety precautions connect the test leads to
the circuit being tested.
The buzzer will sound if the resistance is <150:.
3.15 Diode Testing
If the diode to be tested is in circuit be sure the circuit power is
switched off.
Connect the black test lead to the COM terminal and the red test
lead to the %HzV:terminal.
Set the rotary switch to .
Taking all necessary safety precautions connect the test leads to
the diode being tested.
If the diode is good a forward bias will give a display reading of
around 0.6V (silicon diode) and a reverse bias will give a display of
OL. If the diode is shorted or open circuit the display will indicate
approx 0V or OL respectively for both forward and reverse bias.
3.16 Logic Testing
Connect the black test lead to the COM terminal and the red test
lead to the %HzV:terminal.
Set the rotary switch to LOGIC. The LCD will display LOGIC.
Taking all necessary safety precautions connect the test leads to
the circuit being tested.
A logic 0 (Lo) will be indicated by a on the display.
A logic 1 (Hi) will be indicated by a on the display and the MM84
buzzer will sound.
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4. MAINTENANCE
4.1 Battery Replacement
To avoid shock or injury, disconnect the multimeter from any
external circuits or components and remove the test leads before
proceeding.
The battery is replaced by removing the rear casing of the MM84.
The rear casing is secured to the front by 3 screws and two internal
snaps at the LCD end.
Remove the rear casing by removing the three screws from the rear
casing. Gently lift the input terminal end of the rear casing until it
unsnaps from the casing top.
Fit a new 9V, NEDA 1604, JIS006P, IEC 6F22 battery observing
correct polarity.
NOTE: It is essential to transfer the protective insulating sleeve from
the old battery to the new battery.
Replace the rear casing by snapping it into position and re-install
the three screws.
4.2 Fuse Replacement
To avoid shock, injury or damage to the multimeter, disconnect
the multimeter from any external circuits or components and remove
the test leads before proceeding.
Replace only with the fuse specified.
The fuses are replaced by removing the rear casing of the MM84.
Follow the procedure of section 4.1 (Battery Replacement) to
remove the rear casing.
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9
Replace F1 only with the original type F500mA/600V, fast acting
ceramic fuse and replace F2 only with the original type F20A/600V
High Energy, fast acting ceramic fuse.
Replace the rear casing and screws.
4.3 Test Lead Replacement
If the test leads become damaged they should be replaced.
The replacement test leads must have the same (or better)
overvoltage category rating as the TL16 leads supplied.
4.4 Calibration
To maintain the integrity of measurements made using your
instrument, Martindale Electric recommends that it is returned
at least once a year to an approved Calibration Laboratory for
recalibration and certification.
Martindale Electric is pleased to offer you this service. Please
contact our Service Department for details.
Email: [e-mail]
Tel: [phone]
4.5 Cleaning
The unit may be cleaned using a soft dry cloth. Do not use moisture,
abrasives, solvents, or detergents, which can be conductive.
4.6 Repair & Service
There are no user serviceable parts in this unit other than those that
may be described in section 4. Return to Martindale Electric if faulty.
Our service department will quote promptly to repair any fault that
occurs outside the guarantee period.
Before the unit is returned, please ensure that you have checked the
unit, fuses, test leads and battery.
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10
4.7 Storage Conditions
The instrument should be kept in warm dry conditions away from
direct sources of heat or sunlight, and in such a manner as to
preserve the working life of the unit. It is strongly advised that the
unit is not kept in a tool box where other tools may damage it.
5. WARRANTY AND LIMITATION OF LIABILITY
This Martindale product is warranted to be free from defects in
material and workmanship under normal use and service. The
warranty period is 2 years and begins on the date of receipt by the
end user. This warranty extends only to the original buyer or end-
user customer, and does not apply to fuses, disposable batteries,
test leads or to any product which, in Martindale’s opinion, has been
misused, altered, neglected, contaminated, or damaged by accident
or abnormal conditions of operation, handling or storage.
Martindale authorised resellers shall extend this warranty on new
and unused products to end-user customers only but have no
authority to extend a greater or different warranty on behalf of
Martindale.
Martindale’s warranty obligation is limited, at Martindale’s option, to
refund of the purchase price, free of charge repair, or replacement
of a defective product which is returned to Martindale within the
warranty period.
This warranty is the buyer’s sole and exclusive remedy and is in
lieu of all other warranties, expressed or implied, including but not
limited to any implied warranty of merchantability or fitness for a
particular purpose. Martindale shall not be liable for any special,
indirect, incidental or consequential damages or losses, including
loss of data, arising from any cause or theory.
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11
Since some jurisdictions do not allow limitation of the term of
an implied warranty, or exclusion or limitation of incidental or
consequential damages, the limitations and exclusions of this
warranty may not apply to every buyer. If any part of any provision
of this warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect
the validity or enforceability of any other provision or other part of
that provision.
Nothing in this statement reduces your statutory rights.
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Specication
MM84
True RMS Digital Multimeter
ELECTRICAL SPECIFICATIONS
All specified accuracies are at 23°C ± 5°C, <75% RH
for 1 year
Temperature Coefficient: 0.1 x (specified accuracy)
per °C. (0°C to 18°C, 28°C to 50°C)
DC Voltage
Range Resolution Accuracy
200mV 0.01mV
± (0.05 % of rdg + 3 dgts)
2V 0.0001V
20V 0.001V
200V 0.01V
1000V 0.1V
Input impedance: 10M:
Overload protection: 1000V DC or 750 AC rms
500V DC or 350 AC rms on the 200mV range
True RMS AC Voltage
Range Resolution Accuracy
200mV 0.01mV
50Hz to 500Hz ± (1.0 % of rdg + 10 dgts)
500Hz to 2kHz ± (2.0 % of rdg + 20 dgts)
2V 0.0001V
20V 0.001V
200V 0.01V
750V 0.1V 50Hz to 500Hz ± (2.0 % of rdg + 20 dgts)
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AC coupled true rms specified from 5% to 100% of range
Crest factor: d3
Input impedance: 10M:
Overload protection: 1000V DC or 750 AC rms
500V DC or 350 AC rms on 200mV range
DC Current
Range Resolution Accuracy Voltage
Burden
200μA 0.01μA ± (0.5 % of rdg + 5 dgts) 300mV
2mA 0.0001mA 300mV
20mA 0.001mA 300mV
200mA 0.01mA 600mV
20A * 0.001A ± (2.0 % of rdg + 10 dgts) 800mV
* Current on 10 A range applied for 30 seconds maximum
Overload protection:
0.5A/600V fast blow ceramic fuse on 200μA to 200mA ranges
20A/600V fast blow ceramic fuse on 20A range
True RMS AC Current (50Hz to 1kHz)
Range Resolution Accuracy Voltage
Burden
200μA 0.01μA ± (0.8 % of rdg + 10 dgts) 300mV
2mA 0.0001mA 300mV
20mA 0.001mA 300mV
200mA 0.01mA 600mV
20A * 0.001A ± (2.5 % of rdg + 10 dgts) 800mV
Specication
MM84
True RMS Digital Multimeter
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1
* Current on 10 A range applied for 30 seconds maximum
AC coupled true rms specified from 5% to 100% of range.
Crest factor: d3.
Overload protection:
0.5A/600V fast blow ceramic fuse on 200μA to 200mA ranges
20A/600V fast blow ceramic fuse on 20A range
Resistance
Range Resolution Accuracy
200:0.01:± (0.25% of rdg + 10 dgts)
2k:0.0001k:
± (0.15% of rdg + 3 dgts)20k:0.001k:
200k:0.01k:
2M:0.0001M:± (0.25% of rdg + 10 dgts)
20M:0.001M:± (1.0% of rdg + 10 dgts)
Open circuit voltage: 3.3V DC approx.
Overload protection: 500V DC or AC rms.
Frequency
Range Resolution Accuracy
2 kHz 0.1 Hz
± (0.5 % of rdg + 3 dgts)
20 kHz 1 Hz
200 kHz 10 Hz
Input sensitivity: 50mV rms minimum for sine wave
400mV rms minimum at >30% and <70% duty cycle
Minimum input: 22Hz range > 2Hz, 220Hz range > 20Hz
Minimum pulse width: >2μs at >10Hz
Overload protection: 500V DC or AC rms
Specication
MM84
True RMS Digital Multimeter
MM84 instructions.indd 2 03/07/2012 15:48:29
Specication
MM84
True RMS Digital Multimeter
Duty Cycle
Range Frequency
Range
Resolution Pulse
Width
Accuracy (5V Logic)
0% to 90% 20Hz to 20kHz 0.1 % >10 us ±(2.0% rdg + 10 dgts)
Overload protection: 500V DC or AC rms
Continuity
Audible indication: <150:
Response time: Approx 500ms
Open circuit voltage: 3.3V DC approx
Overload protection: 500V DC or AC rms
Diode Test
Range Resolution Test
Current
Open Circuit
Voltage
Accuracy
2V 0.1mV 1.0 mA 3.3V DC approx ± (0.5% rdg + 1 dgt)
Overload protection: 500V DC or AC rms
Logic Test
Thresholds Pulse Rise
Time (Max)
Pulse
Repetition
Rate (Max)
Pulse Width
(Min)
Logic 1 (Hi) Logic 0 (Lo)
2.8V ± 0.8V 0.8V ± 0.5V 10μs 1 Mpps 25ns
Duty cycle: > 20% and < 80%
Frequency response: 20 MHz
Overload protection: 500V DC or AC rms
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GENERAL SPECIFICATIONS
Display: 4½ digit liquid crystal display with a maximum reading of 19999
Analog bargraph: 22 segments with measurement 20 times per second
Polarity: Automatic, positive implied, negative polarity indication
Overrange: Most significant digit displays “1”
Low battery indication:
symbol is displayed when the battery voltage drops below the operating level
Measurement rate: 2.5 times per second, nominal
Auto power off: After approx 45 minutes
Operating environment: 0°C to 50°C at < 70% RH
Storage temperature: -20°C to 60°C at < 80% RH
Altitude: Up to 2000m
Power: Single standard 9 volt battery, NEDA 1604, JIS006P, IEC 6F22
Battery Life: 300 hours typical with carbon-zinc
Dimensions: 189 (H) x 87 (W) x 37 mm (D)
Weight: 330g approx. including battery
Includes: TL16 test leads, holster, 9V battery (installed) and instructions.
SAFETY:
Conforms to BS EN61010-1, CAT II 1000V DC, 750V AC
Class II Double Insulation
Pollution Degree: 2
TL16 test leads conform to BS EN61010-031, CAT III 1000V, CAT IV 600V, 10A
EMC: Conforms to BS EN 61326
Specication
MM84
True RMS Digital Multimeter
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Check out what else you can get from Martindale:
Martindale Electric Company Limited
Metrohm House, Penfold Trading Estate, Imperial Way, Watford WD24 4YY, UK
Tel: [phone] Fax: [phone]
E-mail: [e-mail]
Website: www.martindale-electric.co.uk
© 2012 Martindale Electric Company Ltd.
Registered in England No. 3387451. E. & O.E. Document Rev1 LITMM84
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MM84 instructions.indd 1 03/07/2012 15:48:24