Clarke CDM10C User manual

OPERATING INSTRUCTIONS
DL0723
DIGITAL MULTIMETER
MODEL NO: CDM10C
PART NO: 4501140

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INTRODUCTION
Thank you for purchasing this CLARKE product.
Before attempting to use this product, please read this manual thoroughly and
follow the instructions carefully. In doing so you will ensure the safety of yourself
and that of others around you, and you can look forward to your purchase
giving you long and satisfactory service.
GUARANTEE
This product is guaranteed against faulty manufacture for a period of 12
months from the date of purchase. Please keep your receipt which will be
required as proof of purchase.
This guarantee is invalid if the product is found to have been abused or
tampered with in any way, or not used for the purpose for which it was
intended.
Faulty goods should be returned to their place of purchase, no product can
be returned to us without prior permission.
This guarantee does not effect your statutory rights.
ENVIRONMENTAL RECYCLING POLICY
Through purchase of this product, the customer is taking on the
obligation to deal with the WEEE in accordance with the WEEE
regulations in relation to the treatment, recycling & recovery and
environmentally sound disposal of the WEEE.
In effect, this means that this product must not be disposed of with general
household waste. It must be disposed of according to the laws governing
Waste Electrical and Electronic Equipment (WEEE) at a recognised disposal
facility.

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SAFETY INFORMATION
BEFORE USE
1. When using the meter, the user must observe all normal safety rules
concerning:
• General protection against electric shock.
• Protection of the meter against misuse.
2. When the meter is delivered, confirm it has not been damaged in transit.
3. The test leads must be kept in good condition. Before using, check that the
insulation on the test leads has not been damaged or any wire exposed.
4. Use only the test leads supplied to ensure operational safety. If necessary,
they must be replaced with test leads of the same model or class.
DURING USE
1. Do not take measurements that exceed the maximum values for this
meter.
2. Do not touch the metal probes of the test leads when the meter is
connected to the circuit being measured.
3. Keep your fingers behind the probe barriers when taking measurements.
4. Do not take voltage measurements if you suspect the value exceeds 600V.
5. If the appropriate value range is unknown, select the highest range on the
scale.
6. Disconnect the test leads from the circuit under test before turning the
rotary function selector.
7. Do not measure the resistance, diode or continuity of live circuits.
8. Do not connect the meter to any voltage source while the rotary selector is
in the Current, Resistance, Diode or Continuity range.
9. Do not use the meter near explosive gases or steam.
10. Stop using the meter if any abnormalities or faults are observed.
11. Do not use the meter unless its rear case and battery cover is correctly and
securely fastened.
WARNING: TAKE CARE WHEN USING THIS METER. IMPROPER USE CAN
RESULT IN ELECTRIC SHOCK OR DAMAGE TO THE METER. TAKE ALL
NORMAL SAFETY PRECAUTIONS AND FOLLOW THE SAFEGUARDS
SUGGESTED IN THIS MANUAL.

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12. Do not store or use the meter in areas exposed to direct sunlight, at high
temperature or with high relative humidity.
13. To avoid false readings, replace the batteries as soon as the Low Battery
indicator appears.
14. Before use, verify the meter operation by measuring a known voltage.
15. Never touch exposed wiring, connections or any live circuit while taking
any measurements.
16. Keep your body isolated from ground by using dry clothing, rubber shoes,
rubber mats or any approved insulating material.
SAFETY SYMBOLS
Please read all of the safety and operating instructions carefully before using
this product. The following safety symbols may be found on the product.
General hazard
warning
High voltage danger.
Earth Class II cabling without
earth conductor.
Possibility of high
voltage

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FEATURES
COMPONENTS OF THE METER
1. Liquid Crystal Display (LCD)
2. Rotary switch
• Selects both different functions and ranges
3. VmA Jack
4. COM jack
5. 10A Jack
6. Data Hold button
•PresstheHOLD button. The LCD will hold the last reading measured and
display the Hsymbol. When the button is released, the meter will return
to normal.

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MEASUREMENT FEATURES OF THIS METER
• AC voltage measurement:- V~
• DC voltage measurement:- V
• DC current measurement:- A
• Resistance measurement:- Ω
• Diode measurement:-
ITEMS SUPPLIED
•Multi-meter
• Pair of test lead/probes (1 red/1 black)
• PP3 type 9-volt battery
• Polymer holder c/w fold-out stand
SPECIFICATION
Model Number CDM10C
Product dimensions: (D x W x H) 40 x 75 x 144 mm
Weight (including case) 303 g
Test leads length (inc probes) 990 mm
Max voltage between input & earth CATII 250V
Fuse F1 125mA/600V F2 10A/600V
Power PP3 9V battery, (NEDA 1604 or 6F22)
Maximum display value 1999
Over-range indication “1”
Polarity display “-” for negative polarity
Detects and measures voltages DCV 200m/2/20/200 ± 0.5%, 600±0.8%
ACV 200,600 ±1.2%
Detects and measures resistance Ohm 200/2k/20k/200k ± 0.8%, 2M ±
1%
Detects and measures current DCA:20µ, 200µ, 2m, 20m ± 1%, 200m±
1.5%, 10 ± 3%
Operating temperature 0-40°C
Storage temperature -10°C to 50°C

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OPERATION
Before taking the measurement of voltage with the probe, make sure there is
no electronic device connected to the test socket of the instrument.
DC VOLTAGE MEASUREMENT
• Overload protection: 200mV range: 250V dcor rms the other ranges
600V dc or rms
DC CURRENT MEASUREMENT
• Overload protection: F1 250mA/600V Fuse F2 10A/600V
AC VOLTAGE MEASUREMENT
• Overload protection: 600V or rms Frequency range: 40Hz to 400Hz
• Display: Average (effective value of sine wave).
Range Resolution Accuracy
200mV 0.1µV
± 0.5% of reading, ± 3 digits
2V 1mV
20V 10mV
200V 100mV
600V 1V ± 0.8% of reading, ± 5 digits
Range Resolution Accuracy
20µA0.01µA
± 1% of reading, ±3 digits
200µA0.1µA
2mA 1µA
20mA 10µA± 1% of reading, ± 5 digits
200mA 100µA± 1.5% of reading, ± 5 digits
10A 10mA ± 3% of reading, ±10 digits
Range Resolution Accuracy
200V 0.1mV ± 1.2% of reading, ± 10 digits
600V 1V

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RESISTOR
• Maximum open circuit voltage: 3.2V
• Overload protection: 250V DC or rms
BEFORE OPERATION
1. If the battery is low when the meter is switched on, the symbol will
display. You will need to replace the battery.
2. The beside the probe jack indicates that the input voltage or current
should not exceed the specified limits in order to protect the internal
circuits.
DC VOLTAGE MEASUREMENT
1. Insert the red probe into the “ mAVΩ” jack and the black probe into
the COM jack.
2. Turn the rotary switch to the range of V and connect the probes to the
power supply or load to be measured. The value detected will be
displayed.
NOTE: If you do not know the measured voltage range in advance, set
the function/range switch to the maximum range, and then
gradually turn to smaller ranges until a satisfactory resolution is
found.
NOTE: If the display shows “1”, this indicates an over-range measurement
and the switch should be set to a higher range.
NOTE: Do not input a voltage of more than 250V. The meter is capable of
indicating a higher voltage, but with the risk of damaging the
internal circuits.
NOTE: When measuring high voltages, pay special attention to avoid an
electric shock.
Range Resolution Accuracy
200Ω0.1Ω± 0.8% of reading, ± 5 digits
2kΩ1Ω
± 0.8% of reading, ± 2 digits
20kΩ10Ω
200kΩ100Ω
2MΩ1kΩ± 1.0% of reading, ± 5 digits

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DC CURRENT MEASUREMENT
1. Plug the black probe into the COM jack. For current to be measured not
exceeding 200mA, plug the red probe into the “ mAVΩ” jack. For
current to be measured between 200mA and 10A, plug the red probe into
the 10A jack.
2. Set the rotary switch to the desired A range and connect the probe in
series with the load to be measured. The current value and the polarity
connected to the red probe will be shown on the display.
NOTE: If you do not know the measured voltage range in advance, set
the rotary switch to the maximum range, and then gradually turn
to smaller ranges until satisfactory resolution is found.
NOTE: If the display shows “1”, this indicates an over-range
measurement, and the switch should be set to a higher range.
NOTE: The symbol beside the probe indicates the maximum input
current is 200mA or 10A, depending on the inserted
jack.depending on the inserted jack. Excess current will blow the
fuse.
AC VOLTAGE MEASUREMENT
1. Plug the red probe into the “ mAVΩ” jack and the black probe into
the “COM” jack.
2. Turn the rotary switch to V~ and connect the probe to the power supply or
load to be measured.
NOTE: Refer to points above for direct current voltage measurement.
RESISTANCE MEASUREMENT
1. Plug the black probe into the COM jack and the red one into the
mAVΩjack.
2. Turn the rotary switch to the COM jack and connect the test probes to the
resistor being measured. Read the results on the display.
NOTE: If the resistor being measured is greater than the maximum value
of the selected range, the display will show “1”, requiring the
selection of a higher range. It normally takes a few seconds for
the reading to get stable when measuring a resistor larger than
1MΩ.
NOTE: In default of input, for instance, open circuit, the display shows
“1”.
NOTE: When measuring an online resistor, de-energize the circuit being
measured and discharge all capacitors.

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DIODE MEASUREMENT
1. Insert the black probe into the COM socket and the red one into the
VΩ.mA, to give the red probe positive polarity.
2. Turn the rotary switch to the range, and connect the red probe to the
positive pole of the diode being measured and the black one to the
negative pole. Read the approximate forward voltage drop of the diode
on the display.
MAINTENANCE
GENERAL CARE
Clean the housing of the meter only with a wet rag dipped in a little detergent
but never a chemical solution.
In case of any abnormality, stop using the meter and send it for maintenance.
REPLACEMENT OF BATTERY AND FUSE
1. The battery for this multimeter is a PP3 (9Volt) as stated on page 4. The
replacement should be of the same specification.
2. Replacment of the fuse, if necessary, is better done by your Clarke service
department using one of those listed on page 6.
3. Never use the meter until the rear cover is screwed on after replacing a
battery or fuse.
WARNING: BEFORE REMOVING THE REAR COVER, DISCONNECT THE
PROBES FROM THE CIRCUIT TO BE MEASURED. ENSURE THE COVER IS
TIGHTLY SECURED BEFORE USING THE INSTRUMENT.