Megger 210170 Operating Manual
M 210170
Insulation &
Low Resistance Tester
User Guide
SAFETY WARNINGS
✱ Safety Warnings and Precautions must be read and understood
before the instrument is used. They must be observed during use.
✱ The circuit under test must be switched off, de - energized and
isolated
before Insulation or Continuity tests are made.
✱ Circuit connections must not be touched during a test.
✱ The test button must not be pressed while connecting the test
leads or while changing ranges.
✱ The ‘Test’button must not be pressed when making a voltage test.
✱ The Default Voltmeter, and Automatic discharge are additional
safety features and
should not be regarded as a substitute for
normal safe working practice.
✱ The 210170 is protected for connection to Power distribution
systems up to 300 V
Line - Ground, and 500 V Line - Line for
Installation Category III*.
✱ It is recommended that fused test leads are used when measuring
voltage on high energy systems.
✱ After insulation tests, capacitive circuits must be allowed to
discharge
before disconnecting the test leads.
✱ Test leads, prods and alligator clips must be in good order; clean,
and with no broken or cracked insulation.
✱ Replacement fuses must be of the correct size, type and rating.
Symbols used on the instrument
Caution: risk of electric shock
Caution: refer to accompanying notes
Equipment protected throughout by Double
Insulation (Class
II)
NOTE
THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT
PERSONS.
OPERATION
Default Voltage measurement
The 210170 will act as a default voltmeter (0 to 600 V a.c.) with any of the
Insulation test positions selected. The ‘Test’ push must not be pressed when
making a voltage test. Note:- The 210170 is internally fuse protected to 500
V. For fuse protection with supplies above 500 V, use Fuse Probe Kit FPK5.
1. Select any Insulation test position with the rotary selector switch.
2. Carefully connect the test leads to the circuit under test.
Do not press the
‘Test’push.
3. Read the voltage measurement from the voltmeter scale.
4. Carefully disconnect the test leads.
Low Resistance measurement (Ω)
1. Select Ω with the rotary selector switch.
2. Ensure that all test leads are clean and in good condition, and connect
them to the
isolated circuit under test.
3. Any pointer deflection indicates a live circuit
, and testing should be
aborted.
4. Press the ‘
Test’push, and keep it pressed while turning the generator
handle.
5. Read the measurement from the
kΩ scale.
6. Disconnect the test leads.
Insulation Testing (MΩ)
Automatic circuit discharge is effective when the test button is released, and
decaying voltage is indicated by the scale needle until the circuit is
discharged.
1. Select
MΩ with the rotary selector switch.
2. Ensure that all test leads are clean and in good condition, and connect
them to the
isolated circuit under test.
3. Any pointer deflection indicates a live circuit
, and testing should be
aborted.
4. Press the ‘
Test’ button, and keep it pressed while turning the generator
handle.
5. Read the measurement from the
MΩ scale.
6. Release the ‘
Test’push and monitor any scale needle movement to
confirm when any discharging voltage decays to zero.
7. When the circuit has discharged, disconnect the test leads.
Refer to Safety Warnings before using the instrument
MEASUREMENT SCALES
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