Triplett MG420 Manuel utilisateur

User Manual

MG420

Analog Megohmeter/Insulation Tester

5 Commonwealth Ave5 Commonwealth Ave

Woburn, MA 01801Woburn, MA 01801

Phone 781-665-1400Phone 781-665-1400

TollToll Free 1-800-517-8431Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Introduction

Congratulations on your purchase of the Triplett MG420 Analog

Megohmmeter/Insulation Tester. The MG420 features three Insulation

test ranges with a live circuit indicator, as well as low resistance and AC

voltage measurements. The Power Lock On feature allows hands-free

operation.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates

the user must refer to the manual for further information.

This symbol, adjacent to a terminal, indicates that, under

normal use, hazardous voltages may be present

Double insulation

Safety Notes

Do not exceed the maximum allowable

input range of any function. Set the

function switch OFF when the meter is

not in use.

Remove the battery if meter is to be stored for longer than 60 days.

Circuits under test must be de-energized and isolated before

connections are made (except for voltage measurements).

Circuit connections must not be touched during a test. Use extreme

caution when working near bare conductors and bus bars.

Accidental contact with conductor could result in electrical shock.

After insulation tests, capacitors must be discharged.

Warnings

Set function switch to the appropriate position before measuring.

When changing ranges always disconnect the test leads from the circuit

under test.

Cautions

Improper use of this meter can cause damage, shock, injury or

death. Read and understand this user manual before operating

the meter.

Always remove the test leads before replacing the battery.

Inspect the condition of the test leads and the meter itself for any

damage before operating the meter. Repair or replace any damage

before use.

Use great care when making measurements if the voltages are

greater than 25VAC rms or 35VDC. These voltages are

considered a shock hazard.

Voltage checks on electrical outlets can be difficult and misleading

because of the uncertainty of connection to the recessed electrical

contacts. Other means should be used to ensure that the terminals

are not "live".

If the equipment is used in a manner not specified by the manufacturer,

the protection provided by the equipment may be impaired

Description

1. Analog display –See Display Description below

2. Batt Check key –Checks battery level (with

TEST key)

3. 0 ADJ key –Adjusts Zero point for

Analog display

4. Backlight key –Turns on Backlight

5. TEST/LOCK key –Enables Battery

Check, Resistance, and Megohmmeter

functions (can be locked by rotating

clockwise)

6. Function Selector knob –Selects desired

range and function

Top View

1. V Test Lead Input

2. COM Test Lead Input

Display Description

1. Red: Megohmmeter Scale: Multiply reading by 0.5 (for 250V

range), 1 (500V), 2 (1000V)

2. Green: Low Resistance Scale (0 to 3 )

3. Green: Resistance Scale (0 to 500

4. Blue: AC Voltage

Measurement Scale (0 to

600V)

5. BATT GOOD Indicator

6. Live Circuit Indicator LED

Operation

CAUTIONS

Observe all safety precautions when the FUNCTION switch is set to

the 250V, 500V or 1000V positions.

Connect the meter test leads to the circuit under test before operating

the TEST key.

Do not touch the clip ends of the test leads when the TEST key is

pressed.

Some electrical equipment, especially cables, may retain an

electrical charge when disconnected from the line. It is good practice

to discharge such equipment with grounding straps, or other suitable

devices, before touching or making connections. The meter

automatically discharges the test circuits when the spring loaded

TEST key is released.

IMPORTANT NOTE

Remove all power to the circuit under test when making

resistance measurements. If any voltage is present in the test

circuit the red on the meter scale plate will light. Immediately

disconnect test leads and turn off power to test circuit.

Live Circuit Indicator LED

If the Live Indicator status LED is lit, voltage is present on the device

under test. DO NOT proceed to test with voltage present. Shock to the

user and damage to the meter or device under test can result if testing is

done with voltage present. Proceed with testing only when the voltage is

removed from the device under test.

Connecting Test Leads

For all measurements, connect the red test lead to the V input terminal

and the black test lead to the COM input terminal.

Battery Check

1. Set the range selector switch to the BATT.CHECK position

2. Press and hold the TEST key.

3. Press the Batt Check key.

4. Observe the meter pointer. If the pointer falls in the BATT GOOD

range of the bottom scale, batteries are good. If the pointer falls

outside of (to the left of) the BATT GOOD area, replace the

batteries.

Test Lead Check

1. Set the FUNCTION switch to the 3 range.

2. Touch the test lead tips together and press the TEST key.

3. Resistance should read less than 0.5 .

4. With the leads not touching, the display should read infinity.

5. Readings displayed other than the readings described above are

indicative of a test lead problem. The test leads must be replaced

before using the meter. Failure to do so could result in damage to

equipment and electrical shock.

Megohm Measurements

1. Disconnect all power from the circuit to be tested.

2. Connect the red test lead to the V input terminal and the black

test lead to the COM input terminal.

3. Set the FUNCTION switch to the desired test range

4. Connect the test leads to the circuit to be tested

CAUTION: If the LIVE CIRCUIT indicator lights up at this point,

DO NOT operate the TEST key. Remove the test leads and

disconnect all power from the circuit.

1. Press and hold the TEST key to make the measurement. Turn

the key clockwise to lock the test on.

2. Read the value on the MΩ scale and apply the range multiplier

to determine the Megohm resistance reading.

3. Release or unlock the TEST key and allow the device to

discharge before removing the test leads.

Range

Reading Multiplier

250V

0.5

500V

1000V

Resistance Measurements

WARNING: Do not run this test unless the voltage on the device under test

is zero. If the Live Circuit status LED lights when a test is initiated,

immediately abort the test and check that the circuit under test is not

powered.

1. Set the Function select switch to the appropriate Resistance (3 or

500Ω) position.

2. Connect the red test lead to the V input and the black lead to the

COM input.

3. Perform a zero adjustment using the 0 ADJ screw on the unit as

described below.

4. Connect the test lead tips to the circuit under test.

5. Press the TEST key. Lock by rotating clockwise if desired.

6. Read the resistance on the appropriate green display scale (3 or 500

7. Release or unlock the Test key.

Zero Adjust

1. Set the range selector switch to the 3Ω or 500Ω range.

2. Short the test leads together.

3. Press the Test key. Lock by rotating clockwise if desired.

4. Use the 0 ADJ control to align the display pointer with the 0 point on

the 3Ω or 500Ω scale.

5. Release or unlock the Test key.

AC Voltage Measurements

1. Set the Rotary switch to the OFF/VAC position.

2. Connect the red test lead to the V input and the black lead to the

COM input.

3. Connect the other end of the test leads to the circuit under test.

4. Read the voltage value on the meter.

Battery Replacement

1. If the Battery Check indicates low battery power, the 6 AA batteries

must be replaced.

2. Remove the test leads and turn the meter over.

3. Unsnap the tilt stand from the rear of the meter.

4. Remove the 4 Phillips head screws that secure the battery cover.

5. Remove the battery compartment cover

6. Replace the batteries, observing correct polarity.

7. Replace the battery compartment cover and secure the 4 screws.

8. Re-attach the tilt stand.

You, as the end user, are legally bound (Battery ordinance) to

return all used batteries and accumulators; disposal in the

household garbage is prohibited!

You can hand over your used batteries / accumulators at

collection points in your community or wherever batteries /

accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the

disposal of the device at the end of its lifecycle.

Specifications

General Specifications

Display

Multiband analog display with

zero adjust

Live Circuit Indicator

LED lights when live circuit is

sensed

Power supply

6 x 1.5V AA batteries

Power consumption

32mA

Fuse Protection

500mA

600V

Operating Temperature

0 to 40oC (32 to 104oF)

Operating Humidity

Below 80%

Altitude

Up to 2000 meters

Storage Temperature

-10 to 60oC (14 to 140oF)

Storage Humidity

Below 70%

Dimensions

200 x 92 x 50mm (7.9 x

3.6 x 2")

Weight

Approx. 700g. (24.7 oz) with

batteries

CAT rating

CATIII 1000V & CATIV

600V

RANGES

Range

Resolution

Accuracy

MIN. Open Circuit

Voltage

MIN Circuit

Current

3Ω

0.05Ω

+3%

4.1V

200mA

500Ω

1Ω

4.1V

AC Voltage

Range

Res.

Accuracy

Input impedance

Overload

Protect

600VAC

20V

±5%

1.2M

Ω

1000Vrms

Megohmmeter

Specifications

Range

Accuracy

Terminal

voltage

100 Ω250VDC

0.2M Ω-5M Ω

±5

250V +

10% ~ -0%

5M to 100 M Ω

±10

200M 500VDC

0.5M Ω-10M Ω

±5

500V +

10% ~ -0%

10MM

±10

400M 1000VDC

1 M Ω-20M Ω

Ω

±5

1000V +

10% ~ -0%

20M Ω

±10

Range

Test Current

/ Load

Short

circuit

Current

100M 250VDC

250K

Approx.

1.3mA

200M 500VDC

500K

400M 1000VDC

Warranty

Triplett / Jewell Instruments extends the following warranty to the original purchaser of

these goods for use. Triplett warrants to the original purchaser for use that the products

sold by it will be free from defects in workmanship and material for a period of (1) one

year from the date of purchase. This warranty does not apply to any of our products

which have been repaired or altered by unauthorized persons in any way or purchased

from unauthorized distributors so as, in our sole judgment, to injure their stability or

reliability, or which have been subject to misuse, abuse, misapplication, negligence,

accident or which have had the serial numbers altered, defaced, or removed.

Accessories, including batteries are not covered by this warranty

Test Equipment Depot -800.517.8431 -5 Commonwealth Ave, Woburn, MA 01801

TestEquipmentDepot.com

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