Extech Instruments 380363 Manual de usuario

User Guide

Model 380363

Insulation Tester / Megohmmeter

Introduction

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

380363 provides three test ranges plus continuity and AC/DC voltage measurement. Manual

datalogging stores up to 9 data sets. This professional meter, with proper care, will provide

years of reliable service.

Model 380363 Version 2.0 July 2005

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 3-3/4 digit (4000 count) LCD

Sampling rate 1 reading per second

Test ranges Resistance: 4MΩ, 40MΩ, 400MΩ, 4000MΩ, 10GΩ

Test Voltages: 250V, 500V, 1000V

AC/DC Voltage range 999V

Resistance range 9999Ω

Lo Resistance range 40Ω

Over range indicator ‘OL’ displayed when measurement exceeds range

Zero adjust Automatic

Memory Nine (9) data records

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)

Fuse protection 0.5A / 600V fast blow fuse

Operating conditions 32 to 122oF (0 to 50oC); 80% RH

Dimensions 9.3 x 4.6 x 2.1” (235 x 116 x 54mm)

Weight 1.15 lbs (520g)

Safety ratings Pollution degree 2; indoor use; CE marked;

Meets IEC 61010-1 and IEC 61557 standards

Category Rating CAT III-1000V

Model 380363 Version 2.0 July 2005

Range Specifications

MEGOHMMETER RANGES

Range Test Voltages Resolution Accuracy

4MΩ0.001MΩ

40MΩ0.01MΩ

400MΩ0.1MΩ

4000MΩ1MΩ

10GΩ

250V (+30% ~ -0%)

500V (+30% ~ -0%)

1000V (+30% ~ -0%)

00.01GΩ

3%+5 (<1000M)

5%+5 (>1000M)

(% reading + digits at

23oC ± 5oC < 80% RH)

Analog Bar Graph 0 to 10G

Nominal Current ≧1mA

Circuit Protection Test inhibited if input ≧30V AC or DC

AC VOLTAGE (40Hz-500Hz)

Range Res. Accuracy Input impedance Overload

Protection

999VAC 1V ±2% + 2d 9MΩ1000Vrms

DC VOLTAGE

Range Res. Accuracy Input impedance Overload

Protection

999VDC 1V ±1% + 2d 9MΩ1000Vrms

RESISTANCE & CONTINUITY

Range Res. Accuracy Max. open circuit

Volt

Overload

Protect.

Resistance: 999.9Ω0.1Ω±1% + 3d 3V 1000Vrms

Continuity 100Ω ± 80Ω)

LOW RESISTANCE Ω

Range Res. Accuracy Max. open

circuit Volt

Overload

Protection

40Ω0.01Ω±2% + 2d 6V >30V AC/DC

Model 380363 Version 2.0 July 2005

Meter Description

1. LCD Display

2. LOCK button

3. MEMORY control button

4. UP arrow key

5. TEST button

6. Rotary switch

7. DOWN arrow key

8. READ memory button

9. ZERO adjust button

10. Input terminals

The tilt stand and battery compartment are

located at the rear of the instrument

Operation

Connecting Test Leads

For all measurements connect the red test lead to the VΩinput terminal and the black test

lead to the COM input terminal.

Test Lead Check

1. Set the rotary switch to the Ω range.

2. Touch the test lead tips together.

3. Resistance should read less than 0.5Ωand the audio tone should sound.

4. With the leads not touching, the display should read OL indicating over-range.

5. Readings displayed other than the readings described above are evidence of a

problem and the test leads must be replaced before using the meter. Failure to do so

could result in damage to equipment and electrical shock. If replacing the test leads

does not solve the problem, return the instrument for repair.

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.

Model 380363 Version 2.0 July 2005

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 VΩinput terminal; black lead to the COM terminal.

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

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

present, it will be displayed. A repetitive beep and the flashing high voltage symbol

will be displayed if the voltage is over 30V.

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

button. The upper right display shows the test voltage applied. The main display

shows the resistance. If the display reads OL, the measurement is beyond the range

of the instrument.

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.

Test Lock Function

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

1. With the test leads connected to the equipment under test, press the LOCK key to

enter the LOCK mode. The LOCK icon “ “ will appear on the display.

2. Press the TEST key to start the test. A beeper will sound every 2 seconds to indicate

that the meter is in Lock mode.

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

Notes on IR (Megohmeter) testing:

1. The maximum measurement range for the 380363 is 10G. Frequently, insulation

resistance will exceed this value and the meter will show the overload display

symbol OL, indicating that the insulation under test is good.

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

resistance value over time. Allow the reading to stabilize before ending a test.

Manual Data Store and Read Mode

To Clear Memory

1. Turn the meter off.

2. Press and hold down the MEM key, and turn the meter on.

3. The display will show “MEM0” in the upper left hand corner - indicating that the

memory has been erased.

Entering data into memory

1. Press the MEM key to enter the displayed data into memory (a beep will sound).

2. The display will show “MEM” and the memory address number in the upper left

hand corner. Total memory size is 9 sets.

3. When memory is full, the meter will sound two quick beeps.

Reading memory data

1. Press the READ key to enter Read Mode. The display will show the “READ” icon

and the memory address number in the upper left hand corner.

2. Use the and arrow keys to scroll through the stored readings.

3. Press the READ key again to exit this mode.

Model 380363 Version 2.0 July 2005

AC/DC Voltage Measurement

1. Set the Rotary switch to the ~V position.

2. Connect the red test lead to the VΩ 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. The meter shows DC voltage in the upper right

and AC voltage on the main display.

Resistance Measurement and Audible Continuity Test

WARNING

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

1. Set the Rotary switch to the Ωposition.

2. Connect the red test lead to the VΩ 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. 100Ω± 80Ω, the audible tone will sound.

LOΩLow Resistance Measurement

1. Set the Rotary switch to the Loposition.

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

3. Touch the test leads together and press the key to zero the display.

4. Connect the probes to the ciruit under test. If there is a voltage present, it will be

displayed. A repetitive beep and the flashing high voltage symbol will be displayed if

the voltage is over 30V. Remove the voltage before proceeding to the next step.

5. Press and hold the TEST key until a stable reading is displayed.

6. Release the TEST key. The upper right hand display will hold the reading until a new

test is started or a different function is selected.

7. Swap the red and black probes to reverse the polarity of the test current. The reading

should remain the same. This test is useful to detect corroded connections which can

cause different readings in both polarities.

Model 380363 Version 2.0 July 2005

Using the LOCK Function to measure resistance

The Lock function can be used to make several resistance measurements in succession

without the need to push and hold the TEST key for each measurement.

1. Press the LOCK key to enter the LOCK mode, and then press the TEST key.

2. Zero out the test lead resistance.

3. Connect the probes to the test locations in succession.

4. Press the LOCK key to disable the lock function.

Note: The meter cannot indicate if the circuit is live in this mode. Ensure that the circuit is de-

energized before connecting the test leads or the fuse may blow.

Auto Power Off

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

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

Analog Bar Graph

The analog bar graph displays resistance on a logarithmic scale and voltage on a linear

scale. The value always tracks the main display.

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 off and remove the test leads

2. Remove the four (4) Phillips head screws on the rear of the meter

3. Remove the meter’s rear cover

4. Replace the batteries observing polarity

5. Affix the rear cover and secure the rear screws

Fuse Replacement

If the meter turns ON but does not measure correctly, check the internal fuse.

1. Turn the meter off and remove the test leads

2. Remove the four (4) Phillips head screws on the rear of the meter

3. Remove the meter’s rear cover

4. Check and replace the fuse if necessary (0.5A / 600V fast blow)

5. Affix the rear cover and secure the rear screws

Cleaning

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

instrument.

Model 380363 Version 2.0 July 2005

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 to the lines 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.

Notes:

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

Motor Starter Mains

Switch Line

GND

Model 380363 Version 2.0 July 2005

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. 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.

Model 380363 Version 2.0 July 2005



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

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.

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