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

Using the Guard Terminal

For basic insulation tests and where there is little possibility of surface
leakage affecting the measurement, it is unnecessary to use the guard
terminal.
In cable testing, there may be surface leakage paths across the insulation
between the bare cable and the external sheathing due to the presence of
moisture or dirt. Where it is required to remove the effect of this leakage,
particularly at high testing voltages, a bare wire may be bound tightly around
the insulation and connected via the third test lead to the guard terminal ‘G’.

The guard terminal is at the same potential as the negative terminal. Since the
leakage resistance is effectively in parallel with the resistance to be
measured, the use of the guard causes the current flowing through surface
leakage to be diverted from the measuring circuit. The instrument therefore
reads the leakage of the insulator, ignoring leakage across its surface.

SPECIFICATION

Insulation Ranges

Measuring Ranges: 0 - 20,000 MΩ at all test voltages
Test Voltages (d.c.): 100 V; 250 V; 500 V; 1kV on open circuit
Test V. Accuracy: ±5%
Short Cct. Current: 220 µA nominal on all ranges

Accuracy: ±3% of scale length on a 3.08 inch arc length
Low resistance Range
Measuring Range: 0 - 5000 Ω

Open Cct. Voltage: 3 V ± 5%
Short Cct. Current: 30 mA ± 10%
Accuracy: ±3% of scale length on a 3.08 inch arc length

Default Voltage measurement
Range: 0 - 600 V a.c.

Accuracy: ±2.5% of scale length
General Specifications
Overload rating: 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*.

Terminal Characteristics

Leakage path

to ‘+’ve

terminal

to ‘G’

terminal

to ‘-’ve

terminal

Tightly bound bare wire

Temp. Range:

Operating: 14°F to 122°F

Storage: 4°F to 158°F

Humidity:

Operating: 70% RH at 68°F, 50% RH at 104°F

Storage: 95% RH at 95°F

Automatic Discharge: Capacitive circuits are automatically discharged when

the ‘Test’push is released following an insulation

test.

Power Supply: Low voltage brushless a.c. generator
Fuses: 2 x 500 mA (F) 500 V H.B.C. 10 kA min 11⁄4“ x 1⁄4“

To check these fuses, short all three test leads together and set the rotary
selector switch on any Insulation test position. Press the ‘Test’push and keep
it pressed while turning the generator handle. The needle should register
approximately 2 MΩ. Azero reading indicates that the ‘G’ fuse has ruptured.
An Infinity reading indicates that the +ve fuse has ruptured.

Fuse Replacement: Held in a screw type holder located in the base of the
instrument. Use a flat blade screwdriver to release the center part of the
holder, and remove the ruptured fuse. Replace with fuse(s) of the correct type,
size and rating.

Weight: 2.2 lb
Dimensions: 81⁄4” (including generator handle) x 5” x 5”

Cleaning: Wipe disconnected instrument with a clean cloth

dampened with soapy water or Isopropyl Alcohol IPA)

*Relates to transient overvoltage likely to be found in fixed installation wiring.

ACCESSORIES

Supplied Part Number

User Guide 6172-382
Test lead set comprising:-

1 black, 1 red, 1 green test lead, with alligator clips 6220-436

Test Record Card (5 supplied) 6172-111

Optional

Carrying case 217740
Fuses (500mA) x 5 6121-289
Fused probe kit

FPK8 6111-287

Test lead set 6220-436
Test Record cards (Pack of 20) 6111-216

Publication - ‘A Stitch in Time’ AVTM21-P8B

0.5A(F) 500V
HBC(10 kA)

Guard fuse

Positive fuse

REPAIR AND WARRANTY

The instrument contains static sensitive devices, and care must be taken in
handling the printed circuit board. If an instrument’s protection has been
impaired it should not be used, but sent for repair by suitably trained and
qualified personnel. The protection is likely to be impaired if for example; it
shows visible damage; fails to perform the intended measurements; has been
subjected to prolonged storage under unfavourable conditions, or has been
subjected to severe transport stresses.

NEW INSTRUMENTS ARE GUARANTEED FOR 1 YEAR

FROM THE DATE OF PURCHASE BY THE USER.

Note: Any unauthorized prior repair or adjustment will automatically invalidate

the Warranty.

INSTRUMENT REPAIR AND SPARE PARTS

For service requirements for Megger Instruments contact :-

Megger or Megger Limited

Valley Forge Corporate Center Archcliffe Road
2621 Van Buren Avenue Dover
Norristown, PA19403 Kent, CT17 9EN
U.S.A. England

Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
or an approved repair company.

Approved Repair Companies.

A number of independent instrument repair companies have been authorised
for repair work on most Megger instruments, using genuine Megger spare
parts. Consult the Appointed Distributor / Agent regarding spare parts, repair
facilities, and advice on the best course of action to take.

Returning an Instrument for Repair

If returning an instrument to the manufacturer for repair, it should be sent
freight pre-paid to the appropriate address. Acopy of the invoice and of the
packing note should be sent simultaneously by airmail to expedite clearance
through Customs. Arepair estimate showing freight return and other charges
will be submitted to the sender, if required, before work on the instrument
commences.

M

Archcliffe Road
Dover
Kent CT17 9EN Tel: [phone]
England Fax: [phone]

2621 Van Buren Avenue
Norristown
PA19403 Tel: [phone]
U.S.A. Fax: [phone]

4271 Bronze Way
Dallas
TX 75237-1017 Tel: [phone] (U.S.A. only)
U.S.A. Tel: [phone] (International)

Fax: [phone]

Megger

29 Allée de Villemomble,
93340 Le Raincy
Paris Tel: [phone]

France Fax: [phone]

This instrument is manufactured in the United Kingdom.
The company reserves the right to change the specification or design without prior notice.
Megger is a registered trademark.

Part No. 6172-382 - Edition 5 - Printed in England - 0703