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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 

 terminal.

Set the rotary switch to the 

 

 

:

 position. The LCD will 

display 

SMART

.

Taking all necessary safety precautions connect the test leads to 
the diode being tested.

The smart function will automatically detect if a diode is present at 
the terminals.

If the diode is good a forward bias will give a display reading of 
around 0.6 V (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 Use as a Non-contact Voltage Detector

 

Non-contact voltage detector testing is not suitable to 
determine if a circuit is 

not

 hazardous live. A double pole 

voltage test should always be used for that purpose.

Before and after each use, the non-contact voltage detector func-
tion must be proven using a suitable proving device or a known 
good voltage source. 

Do not use

 if the unit fails to operate correct-

ly during proving.

Set the rotary switch to the 

NCV

 position. The LCD will display 

EF

.

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Position the area of the clamp jaw marked 

NCV

 between the 

        

marks toward the conductor to be tested for the presence of a live 
voltage.

As the source of a live voltage is approached the buzzer will sound 
intermittently and “-” will be displayed on the LCD. 

Depending on the voltage level, the closer the proximity of the unit 
to the voltage source, the more rapidly the buzzer sounds, until it 
become continuous. The display will change from “-” to “- - - -” one 
step at a time.

4. MAINTENANCE

4.1 Battery Replacement

 

To avoid shock or injury, disconnect the clamp meter from 

any external circuits and remove the test leads before 

proceeding. 

Referring to figure 2, the battery compartment is underneath the 

unit and can be accessed by removing the screw and lifting off the 

cover.

12

Figure 2

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13

Fit 2 new 1.5V, AAA alkaline batteries (IEC LR03, NEDA 24A) 

observing correct polarity.

Replace the battery compartment cover and screw.

Note:

 Do not mix old and new batteries.

4.2 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 test leads supplied.

4.3 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: [email protected]

Tel: 01923 650660

4.4 Cleaning

  

 

To reduce the risk of surface leakage, this instrument must be 

kept in a clean condition.

 

 Prior to cleaning, ensure that the instrument is disconnected 

from any voltage source.

If contamination is found, clean with a damp soft cloth and if 

necessary a mild detergent or alcohol. Do not use abrasives, 

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14

abrasive solvents, or detergents which can cause damage to the 

unit. If a mild detergent is used, the unit should subsequently be 

thoroughly cleaned with a water dampened soft cloth. After cleaning, 

dry and allow to remain in a dry environment for 2 hours before use.

4.5 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, batteries, leads and for poor connections.

4.6 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.

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Summary of Contents for CM57

Page 1: ...e Updated instructions and product information are available at www martindale electric co uk 1 1 Meaning of Symbols and Markings Caution risk of danger refer to instructions Caution risk of electric shock Equipment protected by double or reinforced insulation Class II Application around and removal from hazardous live conductors is permitted CAT II Measurement Category II is applicable to test an...

Page 2: ...s Cautions Avoid severe mechanical shock or vibration and extreme temperature When using test leads avoid excessive stresses to the cable entry points at the probe and 4mm plug connector To avoid possible corrosion from leaking batteries remove the batteries when the unit is not in use for an extended period 2 INTRODUCTION 2 1 Inspection Examine the shipping carton for any sign of damage Inspect t...

Page 3: ...nd release the trigger to close the jaws Position the clamp meter so the conductor is central within the clamp jaws Read the measured ac current from the display Note Clamping around more than one conductor will result in an incorrect measurement 3 11 Voltage Measurements Connect the black test lead to the COM terminal and the red test lead to the terminal Set the rotary switch to the V position T...

Page 4: ...can be accessed by removing the screw and lifting off the cover 12 Figure 2 13 Fit 2 new 1 5V AAA alkaline batteries IEC LR03 NEDA 24A observing correct polarity Replace the battery compartment cover and screw Note Do not mix old and new batteries 4 2 Test Lead Replacement If the test leads become damaged they should be replaced The replacement test leads must have the same or better overvoltage c...

Page 5: ... 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...

Page 6: ... up to 2000m Pollution degree 2 SAFETY Conforms to BS EN 61010 1 BS EN 61010 2 032 CAT III 600V Class II double insulation Specification CM57 AC Smart Clamp Multimeter EMC Conforms to BS EN 61326 1 SPECIFICATION FOR TL16 TEST LEADS Maximum voltage 1000V AC DC Maximum current 10A continuous Connector 4mm banana plug with fixed shroud Environmental Temperature Operating Storage 0 C to 40 C Altitude ...

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