Triplett MG430 Manuale utente

User Manual

MG430

Digital Insulation Tester/Megohmeter

Introduction

Congratulations on your purchase of Triplett’s Digital Insulation Tester/Megohmmeter. The MG430

provides three test ranges plus continuity and AC/DC voltage measurement. A handy test lock feature

and a data hold function are also included. This professional meter, with proper care, will provide

years of reliable service.

Safety

• 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 conductors could result in electrical

shock.

• Use caution when working near voltages above 60VDC or 30VACrms.

• After insulation tests, capacitors must be discharged.

• Test leads (including alligator clips) must be in good working order, clean and without broken

or cracked insulation.

• When servicing, use only specified replacement parts.

International Safety Symbols

Caution, refer to this manual before using this meter

Dangerous Voltages

Meter is protected throughout by double or reinforced insulation

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Meter Description

1. LCD Display

2. Hold Button

3. Test Button

4. Rotary Switch

5. Lock Button

6. Backlight Button

7. Input Terminals

Operation

Warning

Ensure that the circuit under test does not include components that can be damaged by 1000VDC; such

devices include power factor correction capacitors, low voltage mineral insulated cables, electronic light

dimmers, and ballasts/starters for fluorescent lamps.

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.

Test Lead Check

Set the rotary switch to the 200range.

Touch the test lead tips together.

Resistance should read less than 0.5 and the audio tone should sound.

With the leads not touching, the display should read infinity indicated by “1”.

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.

Insulation Resistance Measurements (Megohmmeter Tests)

Warning: Do not perform Insulation Resistance measurements if AC Voltage is present on the

device under test.

1. Connect the red test lead to the V input terminal; black lead to the COM terminal.

2. Set the function switch to the desired M test voltage position.

3. Connect the tips of the test leads to the equipment under test. If there is a voltage present, a

constant beep will sound and the voltage will be displayed.

4. The display will show “1“until the TEST button is pushed. Press and hold the TEST button.

The upper right display shows the test voltage applied and the flashing high voltage symbol

will be displayed. The main display shows the resistance.

5. Keep the test leads connected to the equipment under test and release the TEST button. The

circuit will discharge through the meter. Keep the test leads connected until the circuit is

completely discharged and the upper right display shows 0 volts.

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Lock Function

For hands-free operation, use the LOCK feature.

1. With the test leads connected to the equipment under test, simultaneously press the TEST

and LOCK keys.

2. The LOCK icon” ” will appear on the display. A beeper will sound every 2 seconds to

indicate that the meter is in Lock mode.

3. Press the LOCK key to disable the Lock function and end the test.

Notes on IR (Megohmmeter) testing:

5. The maximum measurement range for the 380260 is 2000MΩ. Frequently, insulation

resistance will exceed this value. When this happens, the display will indicate “1”, meaning

the resistance is very high and the insulation being tested is good.

6. If the device being tested is highly capacitive, the display will indicate an increasing

resistance value over time. Always wait until the reading has stabilized before recording the

value.

AC/DC Voltage Measurement

1. Set the Rotary switch to the ACV or DCV position.

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

3. Connect the test leads to the circuit under test.

4. Read the voltage value on the LCD.

Resistance Measurement

WARNING

Do not run this test unless ACV = 0. Do not use this mode to check diodes.

1. Set the Rotary switch to the 200k position.

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

3. Connect the tips of the test leads to the circuit under test.

4. Read the resistance value on the display.

Low Resistance (Continuity) Measurement

1. Set the Rotary switch to the 200Ω position.

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

3. Connect the tips of the test leads to the circuit under test.

4. Read the resistance value on the display. When the resistance of a circuit is less than approx.

40Ω the audible tone will sound.

Auto Power Off

To conserve battery life, the meter will automatically turn off after approx. 15 minutes of non-use. To

turn the meter back on, turn the rotary switch to OFF, then to the desired function.

Hold Function

The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or

to exit the hold function

Backlight

Press the key for to turn on the display backlight function. The backlight will automatically turn off

after 15 seconds.

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Applications

Measuring Power Tools and Small Appliances

This section applies to any device under test that uses a line cord. For

double insulated power tools, the meter’s leads should be connected to

the device’s housing (chuck, blade, etc.) and the lines of the power

cord.

Testing AC Motors

Disconnect the motor from the line by disconnecting the wires from the motor terminals or opening

the mains switch.

If the mains switch is opened, and the motor also has a motor-starter, then the starter must be held

in the ON position. With the mains switch opened, the measured resistance will include the

resistance of the motor wire and all other components between the motor and the main switch. If a

weakness is indicated, the motor and other components should be checked individually. If the motor

is disconnected at the motor terminals, connect one meter lead to the grounded motor housing and

the other lead to one of the motor leads. Refer to diagram at below.

Motor

Starter

Mains

Line

Switch

GND

Notes:

1. The STARTER must be in the ON position during the

Testing DC Motors

1. Disconnect the motor from the line.

2. To test the brush rigging, field coils and armature, connect one meter lead to the grounded

motor housing and the other lead to the brush on the commutator.

3. If the resistance measurement indicates a weakness, raise the brushes off of the commutator

and separately test the armature, field coils and brush rigging (one at a time). Leave one lead

connected to the grounded motor housing while testing the motor components. This also

applies to DC Generators.

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Specifications

Range Specifications

Accuracies are specified as % reading + digits at 23oC ± 5oC < 80% RH

MEGOHMMETER RANGES

Range

Resolution

Accurac

Terminal Voltage

200M 250V

0.1M

±3% + 5d

250V + 10% ~ -0%

200M 500V

0.1M

±3% + 5d

500V + 10% ~ -0%

0-1000M 1000VDC

±3% + 5d

1000V + 10% ~ -0%

1000-2000M 1000VDC

±5% + 5d

1000V + 10% ~ -0%

Range

Test Current

Short Circuit

Current

200M 250V

250k (load)

200M 500V

1mA

500k (load)

<1mA

0-1000M 1000VDC

1000-2000M 1000VDC

AC VOLTAGE (40Hz-

400Hz)

Range

Resolution

Accuracy

Input

Impedance

Overload

Protection

750VAC

±1.2% + 10d

10M

750Vrms

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DC VOLTAGE

Range

Resolution

Accuracy

Input

Impedance

Overload

Protection

1000VDC

±0.8% +

10M

1000Vrms

RESISTANCE

Range

Resolution

Accuracy

Max. Open

Circuit

Overload

Voltage

Protection

200

0.1

±1% + 2d

4.5V

250Vrms

200k

0.1k

±1% + 2d

250Vrms

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General specifications

Display LCD with dual display

Sampling rate 2.5 readings per second

Continuity beeper <40 Ω, short circuit current <200mA, open circuit

voltage 4.5V

Over range indicator ‘1’ displayed

Zero adjust Automatic

Low battery indicator Low battery symbol displayed when battery

voltage is low

Environmental Installation category III, Pollution Degree 2,

Altitude up to 2000

meters, Indoor use only

Power source Six (6) 1.5 ‘AA’ batteries

Fuse 250mA/600V ceramic 3AG Fast blow

Operating conditions 0 to 40oC (32 to 104oF); 80% RH

Storage conditions -10 to 60oC (14 to 140oF); <80% RH

Dimensions 200 x 92 x 50mm (7.8 x 3.6 x 1.9”)

Weight 700g (24.6oz)

IEC 1010 CAT III-1000V

Approvals

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Maintenance

Battery Replacement

When the low battery symbol appears on the

LCD, the six 1.5V ‘AA’ batteries must be

replaced.

1. Turn the meter off and remove the test leads

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

3. Remove the four Phillips head screws holding the

battery cover

4. Remove the battery compartment cover

5. Replace the batteries observing polarity

6. Affix the rear cover and secure the screws.

7. Reattach the tilt stand

Warranty Information

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

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