Megger 210170 Manuel utilisateur

M210170

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.

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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 Ωwith 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 kΩscale.

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 MΩwith 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 MΩscale.

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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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 MΩat 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

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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. A zero 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

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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 :-

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. A copy of the invoice and of the

packing note should be sent simultaneously by airmail to expedite clearance

through Customs. A repair estimate showing freight return and other charges

will be submitted to the sender, if required, before work on the instrument

commences.

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