3
Make sure the clamp meter and test leads are dry, clean and free
from dust, grease and moisture while in use to avoid the danger
from electric shock due to surface leakage.
Always test this unit on an appropriate proving device or a known
good voltage source before and after using it to determine if a
hazardous voltage exists in a circuit to be tested.
Do not use
the
unit if it does not function correctly during proving.
Measuring/testing for a voltage/current that exceeds the specified
limits of the unit may damage the unit and may expose the operator
to a shock hazard. Always check the unit’s specified limits before
use.
As a clamp meter or multimeter the unit must only be used on
CAT III and CAT II installations up to 600V to earth, and within the
operating temperature and humidity range specified.
If the removable probe tip caps are not fitted to the probes of the
test leads, their measurement category becomes CAT II 1000V,
and they
must not be used
on CAT III or CAT IV installations to
avoid the risk of shorting high energy circuits and arc flash.
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.
Do not use
if the battery compartment cover is not fitted.
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When using test leads,
always
keep your fingers behind the finger
guard on the test lead probe.
When positioning the clamp jaws around a hazardous live conductor
always
keep your fingers behind the clamp safety protection barrier.
When making current measurements using the clamps, disconnect
the test leads from the clamp meter terminals.
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 the
unit and any accessories for damage. If there is any damage then
consult your distributor immediately.
2.2 Description
The Martindale CM57 has a SMART function that automatically
detects if AC or DC voltage is being measured when set to the
voltage function. The SMART function also automatically determines
if resistance or capacitance is being measured or if a diode is being
tested.
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The Martindale CM55 has the following measurement functions:
True rms AC current to 600A
True rms AC voltage to 600V
DC voltage to 600V
Resistance to 6M
:
Capacitance to 600μF
Frequency to 100kHz
Continuity with audible indication
Diode testing
Further functions are:
Non-contact voltage detector
Display hold
Auto power off
Auto ranging
Display backlight
2.3 Accessories
The CM57 comes with the following accessories:
Carrying case
Set of TL16 test leads
2 x 1.5V AAA batteries
Instructions
2.4 Battery Installation
Refer to section 4.1 (Battery Replacement) for the battery
installation instructions.
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3. OPERATION
3.1 General
If the clamp meter displays
OL
then the measurement limits of the
range have been exceeded.
3.2 Low Battery Indication
If the
symbol is displayed, the batteries need replacing as
measurement accuracy can no longer be guaranteed (see section
4.1 Battery Replacement).
3.3 Description of Clamp Meter Elements
1
Clamp current sensing jaws
2
NCV sensing area
3
Clamp safety protection barrier
4
Clamp trigger
5
Rotary function selector switch
6
Backlight button
7
Frequency selector button
8
Hold button
9
Liquid crystal display
10
COM input terminal
11
Positive input terminal
Figure 1
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