Clarke CDM95 Instruction Manual

OPERATING & MAINTENANCE
INSTRUCTIONS
GC0111
PROFESSIONAL AUTO RANGING
DIGITAL CLAMPMETER - 6 FUNCTION
MODEL No: CDM95
Part No: 4500099

2
INTRODUCTION
Thank you for purchasing this CLARKE CDM95 Digital Clampmeter.
Please read this manual thoroughly and follow the instructions carefully, in
doing so you will ensure that operations are carried out in safety and you
can look forward to the product giving you long and satisfactory service.
GUARANTEE
This CLARKE product is guaranteed against faulty manufacture for a period
of 12 months from the date of purchase. Please keep your receipt 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 its intended purpose.
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.
SPECIFICATION
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3
CONTENTS
SAFETY INFORMATION ........................................... 4
Preliminary .................................................................................. 4
During Use .................................................................................... 4
Symbols ......................................................................................... 5
DESCRIPTION .......................................................... 6
Components of the Meter...................................................... 6
SWITCHES, PUSHBUTTONS AND INPUT JACKS ............. 9
Liquid Crystal Display (LCD) ................................................. 9
OPERATION INSTRUCTIONS ...................................... 10
Holding Readings ..................................................................... 10
Switching Ranges ..................................................................... 10
Switching Maximum Value ................................................... 10
Switching Functions ................................................................. 11
Back Light and Clamp Light Bulbs ................................... 11
Low Battery Indicator ............................................................ 11
Auto Power-Off ........................................................................ 11
Measuring AC Current ............................................................ 12
Measuring AC Voltage .......................................................... 13
Measuring DC Voltage .......................................................... 15
Measuring Restistance ........................................................... 17
Testing Diodes ............................................................................. 19
Testing Continuity ..................................................................... 20
MAINTENANCE ...................................................... 22
General Care ........................................................................... 22
Repalcing The Batteries ...................................................... 22
Repalcing Test Leads ............................................................ 22
Calibration .................................................................................. 22
DECLARATION OF CONFORMITY ............................. 23

4
SAFETY INFORMATION
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.
PRELIMINARY
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 rangeon
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.

5
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.
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.
SYMBOLS
Caution, risk of danger.
Beware electrical hazards.
Double insulation ( Protection class II).
Conforms to the European Union Directive
Earth (ground) terminal

6
DESCRIPTION
This meter is a portable, professional, measuring instrument with a Liquid
Crystal Display (LCD) and back light for easily reading.
The meter can perform measurements of AC current, AC/DC voltage,
resistance, as well as continuity and diode testing. Both Auto range and
Manual ranges are available.
The meter is equipped with a reading hold function, a maximum value
measuring function and the function of auto power off.
COMPONENTS OF THE METER
1. Current Clamp
2. Clamp Lighting Bulb
3. Panel
4. Trigger
5. Back Light Button
6. Function Button (SEL)
7. MAX Button (MAX)
8. Liquid Crystal Display (LCD)
9. COM Jack
10. Input Jack
11. Range Button (RAN)
12. Display Hold Button (HOLD)
13. Rotary Selector
14. OFF - Power Switch
15. Rear Case
16. Fixing Screw (Battery Cover)
17. Battery Cover

7

8

9
SWITCHES, PUSHBUTTONS & INPUT JACKS
Button For controlling the backlight.
SEL Button For switching between measuring functions.
MAX Button For switching to maximum measurement value.
RAN Button For switching between Auto and Manual ranges.
HOLD Button For holding the reading (display hold).
INPUT Jack For measuring voltage, resistance, diode and continuity.
COM Jack Common input connection for current, voltage,
resistance, diode and continuity measurement.
OFF Position For turning off the power.
Rotary selector For selecting functions and ranges.
Clamp For measuring current.
Liquid Crystal Display (LCD)
AC Alternating current
DC Direct current
Diode test
Continuity buzzer
AUTO Auto range mode
MAX The maximum value is being measure
Battery low
HThis indicates that the display data is being held.
mV, V Milli-volts, Volts (Voltage)
AAmperes (Current)
Ω,Ω,
Ω,Ω,
Ω, kΩ,Ω,
Ω,Ω,
Ω, M
ΩΩ
ΩΩ
ΩOhms, Kilo-ohms, Mega-ohms (Resistance)

10
OPERATION INSTRUCTIONS
1. Switch on the power by turning the rotary selector. If the battery
voltage is low, the symbol will appear and the batteries should
be replaced.
2. Turn the rotary selector to the required function to be measured.
Choose the highest range when the value to be measured is unknown.
3. Connect the earth test lead before the positive test lead when
making the connection. Remove the positive test lead first when
disconnecting.
SELECTING RANGES
When the meter is turned on, it will be in the Auto Range mode for
measuring current, voltage, resistance and continuity.
1. Press the RAN button for Manual Range mode. The range will go up
one level at each press and return to the lowest level when the highest
level is reached.
2. Press the RAN button, for two or more seconds to return to the Auto
Range.
3. Press the RAN button when measuring the maximum or minimum
value, and the meter will return to the normal working condition.
SELECTING FUNCTIONS
1. Press the SEL button to switch between AC and DC voltage
measurement ranges.
2. Press the SEL button to switch between diode and continuity
measuring ranges.
HOLDING READINGS
1. Press the HOLD button to hold the readings while taking
measurements.
• The value on the display will be held.
2. Press the HOLD button again to release the function.
SELECTING MAXIMUM VALUE
1. Press the MAX button to show the maximum value measured.
2. Press the MAX button again to return to standard mode.

11
BACKLIGHT AND CLAMP LIGHTING BULB
1. Press the button for two or more seconds to switch the backlight
on and off.
• When the back light is switched on at the current range, the clamp
lighting lamp will illuminate.
• The backlight will turn off automaticallyafter 15 seconds.
NOTE:
• Frequent use of the back light will shorten the life of the batteries
and therefore it should not be used unnecessarily.
LOW BATTERY INDICATOR
When the battery voltage is below 3.6V, the symbol, ( battery low) will
appear on the LCD. The accuracy of measurement cannot be assured
when the symbol appears.
NOTE:
• When the back light is on, the Battery Low symbol may appear due
to the current drawn causing the voltage to drop. In this case,
there is no need to replace the batteries until the Low Battery
symbol appears when the back light is not being used.
AUTO POWER OFF
1. If the meter is not used within fifteen minutes of being switched on, the
meter will ‘Auto Power-Off’.
2. Turn the rotary selector or press any button to resume operation of the
meter in the ‘Auto Power-Off’ mode.
3. When powering up, if the HOLD button is pressed, the ‘Auto Power-Off’
function is disabled.

12
MEASURING AC CURRENT
Ensure the test leads are disconnected from the meter before making
current clamp measurements.
1. Turn the rotary selector to the A range position.
2. Press the RAN button if required, to choose the Manual Range mode.
3. Squeeze the trigger to open the jaw and fully enclose only one
conductor.
4. Take the reading showing on the LCD.
NOTE:
• For accurate results, do not enclose more than one conductor in
the jaws.

13
• For optimum results, centre the conductor in the jaws.
• If OL is displayed when in manual mode, the measurement has
exceeded the selected range and a higher one should be
selected.
• Select the highest available range in the Manual Range mode,
when the scale of the value to be measured is not known.
• The maximum permitted input current for the meter is 600A rms
AC.
• Max input current:- 600A.
• Frequency range:- 50 to 60Hz.
• Response average:- calibrated in rms of sine wave.
MEASURING AC VOLTAGE
Pay special attention to avoid electric shock when measuring high
voltages.
Do not connect to a voltage greater than 600V rms AC.
1. Plug the black test lead into the COM jack and the red test lead into
the INPUT jack.
2. Turn the rotary selector to the V~ position, setting the meter to the AC
V measurement mode.
3. Press the RAN button if required, to choose the Manual Range mode.
4. Connect the test leads to the voltage source for measurement.
5. Note the reading on the LCD.
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14
NOTE:
• At a low voltage range, unsteady readings may appear before
the test leads touch the circuit. This is normal because the meter is
highly sensitive. When the test leads contact the circuit, the true
reading will be shown.
• If OL is displayed when in manual mode, the measurement has
exceeded the selected range and a higher one should be
selected.
• In the Manual Range mode, when the value to be measured is not
known, select the highest range first and lower the range gradually.
• The maximum permitted input voltage for the meter is 600V rms
AC.

15
• Input impedance 10MΩ.
• Overload protection: 200mV range: 25V DC or rms AC, 2V-600V
ranges: 600V DC or rms AC.
• Max. input voltages 600V rms AC.
• Frequency range: -40 to 200Hz.
• Response average, calibrated in rms of sine wave.
MEASURING DC VOLTAGE
Pay special attention to avoid electric shock when measuring high
voltage.
Do not connect to a voltage greater than 600V DC.
1. Plug the black test lead into the COM jack & the red lead into the
INPUT jack.
2. Turn the rotary selector to the V position.
3. Press the SEL to switch to DC V measurement. If required, press the
RAN button to choose the Manual Range mode.
4. Connect the leads to the voltage source or load terminals for
measurement.
5. Take the reading on the LCD. The polarity symbol - indicates the
polarity of the DC voltage source. It may also indicate an
inadvertantly reversed probe connection.
NOTE:
• At the lower voltage range, unsteady readings will appear before
the test leads touch the circuit. This is normal because the meter is
highly sensitive. When the test leads touch the circuit, the true
reading will be shown.
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16
• If OL or -OL are displayed when in manual mode, the
measurement is outside the selected range and a different one
must be selected.
• Using the Manual Range mode, when the scale of the value to be
measured is not known, select the highest range & lower the range
gradually.
• The maximum permitted input voltage for the meter is 600V DC.

17
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MEASURING RESISTANCE
When measuring in-circuit resistance, ensure the circuit under test has
been turned off and that all capacitors have been fully discharged.
1. Plug the black test lead into the COM jack & the red lead into the
INPUT jack.
2. Turn the rotary selector to the Ω position.
3. Press the RAN button to choose the Manual Range mode if required.
4. Connect the test leads to the ends of the resistor or circuit for
measurement.
5. Note the reading on the LCD.

18
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19
• Open circuit voltage: 0.25V
• Overload protection: 250V DC or rms AC
NOTE:
• If only OL is shown on the LCD while in Manual mode, it means the
measurement has exceeded the range and a higher range must
be selected. It may also mean the circuit is not connected.
• When the input is open, OL will appear on the LCD to indicate that
the range has been exceeded.
• For measuring resistance above 1 MΩ, it may take a few seconds
to get a steady reading. This is normal for a high resistance reading.
TESTING DIODES
1. Plug the black test lead into the COM jack & the red lead into the
INPUT jack.

20
TESTING CONTINUITY
Make sure that the circuit has been turned off and the capacitors have
been fully discharged before testing the continuity of a circuit.
1. Plug the black test lead into the COM jack & the red lead into the
INPUT jack.
2. Set the rotary selector to the position.
3. Press the SEL button to switch to continuity test.
4. Connect the test leads to the two ends of the circuit for measurement.
5. If there is continuity in the circuit being tested, the buzzer will sound.
6. If the test leads are open, OL will be displayed on the LCD.
2. Turn the rotary selector to the position.
3. Connect the red test lead to the anode and the black test lead to the
cathode (black striped end) of the diode for testing.
4. Take the reading on the LCD.
NOTE:
• The meter will show the approximate forward voltage drop of the
diode.
• When the test leads have been reversed or open, OL will appear
on the LCD.
• Forward DC current :- 1mA
• Reversed DC voltage: - 1.5V
• Overload protection: 250V DC or rms AC