Extech Instruments 380360 Manuale utente

Model 380360 Version 1.7 September 2003

User Guide

Model 380360

Insulation Tester / Megohmmeter

Introduction

Congratulations on your purchase of Extech’s Insulation Tester/Megohmmeter. The Model

380360 provides three test ranges plus continuity and an AC voltage test. A handy 3-minute

test lock feature and a data hold switch are also included. This professional meter, with

proper care, will provide years of reliable service.

Model 380360 Version 1.7 September 2003

Safety

1. Circuits under test must be de-energized and isolated before connections are made

(except for voltage measurements).

2. 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.

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

4. After insulation tests, capacitors must be discharged.

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

broken or cracked insulation.

6. 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

Specifications

General specifications

Display 0.65” 3-1/2 digit (2000 count) LCD

Sampling rate 2.5 readings per second

Test ranges 2000MΩ/1000VDC, 200MΩ/500VDC, 200MΩ/250VDC

AC Voltage range 600VAC

Resistance range 200Ω

Over range indicator ‘1____’ displayed

Zero adjust Automatic

Low battery indicator ‘BT’ symbol displayed when battery voltage is low

Power source Six (6) 1.5 ‘AA’ batteries

Power consumption 20 to 95mA (depending upon function)

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

Dimensions 6.5 x 3.9 x 2.2” (165 x 100 x 57mm)

Weight 1.1 lbs (500g)

Model 380360 Version 1.7 September 2003

Range Specifications

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

RESISTANCE

Range Res. Accuracy Max. open

circuit Volt

Overload

Protect.

200Ω0.1 Ω ±1% + 2d 3.3V 500Vrms

CONTINUITY

Range Res. Audible tone Max. open

circuit Volt

Overload

Protect.

200Ω0.1Ω< 100Ω3.3V 500Vrms

AC VOLTAGE

Range Res. Accuracy Input impedance Overload

Protect.

600VAC 1V ±0.8% + 3d 10MΩ750Vrms

MEGOHMMETER RANGES

Range Res. Accuracy Terminal voltage

200MΩ / 250VDC 250V + 10% ~ -0%

200MΩ / 500VDC 0.1MΩ500V + 10% ~ -0%

0 to 1000MΩ / 1000VDC

±3% + 5d

1000 to 2000MΩ / 1000VDC 1MΩ±5% + 5d 1000V + 10% ~ -0%

Range Test Current / Load Short circuit Current

200MΩ / 250VDC 250KΩ

200MΩ / 500VDC 500KΩ

0 to 1000MΩ / 1000VDC

1000 to 2000MΩ / 1000VDC

1mA

1MΩ

< 1.5mA

Model 380360 Version 1.7 September 2003

Meter Description

1. LCD Display

2. Rotary function switch

3. Data hold switch

4. Test button

5. Manual / Lock select switch

6. HI input terminal

7. COM input terminal

8. LO input terminal

9. Positive test lead

10. Negative test lead

Operation

Connecting Test Leads

For the MΩrange, connect the red test lead to the HI input terminal and the black test lead

to the LO input terminal. For the 200Ωand 600VAC functions, connect the red test lead to

the HI (right) input jack and the black lead to the COM (center) jack.

Test Lead Check

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

2. Set the rotary switch to the 200Ω range.

3. Set the HOLD switch to the left off position and the

MANU/LOCK switch to the MANUAL position.

4. Touch the test lead tips together.

5. Press the red TEST button.

6. Resistance should read less than 1Ωand the audio tone

should sound.

7. With the leads not touching, the display should read 1__

indicating over-range.

8. 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.

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.

4 8 7

Model 380360 Version 1.7 September 2003

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 HI input terminal; black lead to the LO terminal.

2. Set the HOLD switch to the left off position and the MANU/LOCK switch to the

MANUAL position.

3. Set the rotary switch to the desired test voltage (250V, 500V,

or 1000V).

4. Connect the tips of the test leads to the equipment under test.

5. Press and hold the TEST button. Release the test button to

stop the test.

6. Read the measurement value on the LCD display.

3-Minute Test Lock

For hands-free operation, use the TEST LOCK feature.

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

to the LO terminal

2. Set the rotary switch to the desired voltage test position

(250V, 500V, or 1000V).

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

4. Set the MANU/LOCK switch to the LOCK position.

5. Press and release the red TEST button. A 3-minute continuous test will begin. The

red TEST button can be pressed at any time to end the test. If the TEST button is not

pressed, the meter automatically stops the test after 3 minutes.

Notes on IR (Megohmeter) testing:

1. The maximum measurement range for the 380360 is 2000MΩ(2GΩ). Frequently,

insulation resistance will exceed this value. When this happens, the display will

indicate 1 MΩ, meaning the resistance is very high and the insulation being tested

is good.

2. 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.

Model 380360 Version 1.7 September 2003

Low Resistance and Audible Continuity Tests

WARNING

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

1. Set the Rotary switch to the 200Ωposition.

2. Connect the red test lead to the HI input terminal; black lead to the COM terminal.

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

4. Press the red TEST button and read the resistance on the LCD.

5. When the resistance of a circuit is less than approx. 100Ωthe audible tone will sound.

AC Voltage Tests

1. Set the Rotary switch to the red 600V position.

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

terminal.

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

4. Read the voltage value on the LCD.

Data Hold Function

The Data Hold function freezes the displayed reading. Move the HOLD switch to the

rightmost position to freeze the displayed reading. The ‘H’ will appear on left side of the

display when the meter is in the Data Hold mode. Move the switch to the left position to

exit the Data Hold mode (the ‘H’ indicator will switch off).

Maintenance

Battery Replacement

When the low battery symbol appears (BT) on the LCD the six 1.5V ‘AA’ batteries must be

replaced.

1. Turn the meter is off and remove the test leads

2. Remove the Phillips head screw on the rear of the meter

3. Remove the battery compartment cover

4. Replace the batteries observing polarity

5. Affix the rear cover and secure the rear screw

Cleaning

Periodically wipe the case with a dry cloth. Do not use solvents or abrasives to clean this

instrument.

Model 380360 Version 1.7 September 2003

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 ground

of the power cord. Refer to the diagram.

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.

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.

Testing Cables

1. Disconnect the cable under test from the line.

2. Disconnect the opposite end of the cable to avoid errors as a result of leakage from

other equipment.

3. Check each conductor to ground and/or lead sheath

by connecting one meter lead to ground and/or lead

sheath and the other meter lead to each of the

conductors in turn.

4. Check insulation resistance between conductors by

connecting meter leads to conductors in pairs. Refer to diagram at right. In the

diagram, note that the 3-conductor cable has two wires shorted to the ground shield.

This two-wire/shield connection is then connected to one side of the meter. The

remaining conductor is connected to the other side of the meter.

Appliance

HI LO

Meter test leads

Motor

GND

Starter Mains

Switch LINE

Notes:

1. The STARTER must be in the ON position during

the test.

2. The motor-to-meter connection must be made to

the motor housing (ground).

3. The meter-to-main switch connection must be to the

motor side of the main switch as shown.

LO HI

meter test leads

LO HI

Test leads

Model 380360 Version 1.7 September 2003



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: support@extech.com

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

Application Note for Large Installations

In large wiring installations where the insulation of outlets is being tested, more than one

insulation resistance measurement may have to be made to take into account parallel

resistances. Divide large systems into subgroups and test subgroups individually. Also, in

large installations, the capacitance of the insulation will be high, thereby taking longer to

charge when being tested. Care must be taken not to finish a measurement until the

insulation capacitance is fully charged (a steady, stable reading is an indication that this is

the case). Be careful not to turn the range switch while the test button is pressed.

Repair and Calibration

Extech offers repair and calibration services for the products we sell. Extech also provides

NIST certification for most products. Call the Customer Service Department for information

on calibration services available for this product. Extech recommends that annual

calibrations be performed to verify meter performance and accuracy.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one

year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to

return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781)

890-7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service

Department’ to request an RA number). A Return Authorization (RA) number must be issued before any product is returned

to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in

transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation

outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any

implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental

or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth

above is inclusive and no other warranty, whether written or oral, is expressed or implied.

including the right of reproduction in whole or in part in any form.

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