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3.28 Insulation Resistance Measurements
Connect the black TL45 test lead to the
INSULATION
terminal.
Connect the red TL45 test lead, or the optional TL180 test probe, to
the
INSULATION
terminal.
Set the rotary switch to the
INSULATION
position.
Press the
RANGE
50V~1KV
button to select the required test voltage (50V,
100V, 250V, 500V or 1000V). The selected test voltage will be
displayed on the LCD.
Press the
SEL
ZERO
button to activate the smooth function if a noisy
measurement requires stabilising. The LCD will display the
SMOOTH
symbol.
Taking all necessary safety precautions connect the TL45 test
leads, or if applicable, the TL180 test probe and black TL45 test
lead, to the circuit being measured.
If there is a live circuit warning (see section 3.13) do not continue
with the test and remove all connections from the circuit under test.
Press either the
INSULATION
TEST
button, or if using the TL180 test probe,
the test button on the test probe, and hold it down for the duration
of the test.
Note: It is not necessary to hold down the test button if the lock
function is active (see section 3.14).
Read the measured insulation resistance from the main display
and the actual test voltage from the sub-display.
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The measured insulation resistance will be held on the display after
the test has ended.
Overrange on the insulation resistance measurement function
is indicated by a fl ashing “ > ” symbol followed by the maximum
reading of the selected test voltage. E.g. “ > 3G
:
” for a test voltage
of 500V.
4. MAINTENANCE
4.1 Battery Replacement
To avoid shock or injury, disconnect the CMi210 from any
external circuits and remove the test leads before proceeding.
The battery compartment is underneath the unit and can be
accessed by undoing the 2 screws and lifting off the cover.
Fit 5 new 1.5V, AA alkaline batteries (IEC LR6, NEDA 15A)
observing correct polarity.
Replace the battery compartment cover and screws.
Note:
Do not mix old and new batteries.
4.2 Fuse Replacement
To avoid shock, injury or damage to the CMi210, disconnect
it from any external circuits and remove the test leads and
batteries before proceeding.
Replace only with the fuse specifi ed.
The fuse is inside the battery compartment.
The battery compartment is underneath the unit and can be
accessed by undoing the 2 screws and lifting off the cover.
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Replace only with the original type 0.5 A/1000V 6.3x32mm fast
blow ceramic fuse.
Replace the battery compartment cover 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 TL45 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 certifi cation.
Martindale Electric is pleased to offer you this service. Please
contact our Service Department for details.
Email: [email protected]
Tel: 01923 650660
4.5 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,
abrasive solvents, or detergents which can cause damage to the
unit. If a mild detergent is used, the unit should subsequently
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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.
4.6 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, batteries, leads and poor connections.
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.
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