Extech Instruments 380395 Manuale utente

User's Guide

Digital High Voltage Insulation Tester

Model 380395 or 380396

MAX

MIN

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Introduction

Congratulations on your purchase of the Extech 380395 (120V) or 380396 (220V) High Voltage

Insulation Tester. This meter provides four Insulation Resistance test ranges plus Continuity,

AC/DC Voltage, Polarization Index and Dielectric Absorption Ratio measurements. This meter is

shipped fully tested and calibrated and, with proper care and use, will provide years of reliable

service.

Features

Auto ranging 6000 count LCD display with bargraph

Selectable LCD backlight level function facilitates working in dimly illuminated areas.

MAX/MIN, PEAK, Relative, and Data hold functions for DC/AC voltage measurements.

Designed to the following safety standards:

IEC 61010-1 (CAT IV 600V Pollution degree 2)

IEC 61010-031 (Requirements for hand-held probes)

Insulation test range: 0.1Mto 60G.

Insulation test voltages: 500V, 1000V, 1500V, and 5000V.

AC/DC voltage: 0.5 V to 600 V.

200mA Continuity.

Resistance: 0.1 to 6k.

Auto-discharge function & voltage output warning function.

Electric charges stored in capacitive circuits are automatically discharged after measurements.

Discharge status can be checked using the real time voltage bargraph.

LIVE circuit warning symbols plus audible warning.

Live circuit detection prevents insulation test if voltage > 30 V is detected.

Auto-power off function and battery check.

Programmable Test Timer measurement function.

Polarization Index measurement (PI).

Dielectric Absorption Ratio measurement (DAR).

Power source: Eight (8) 1.5V ‘C’ Cell Batteries.

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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.

Danger: identifies conditions and actions that pose hazard(s) to the user.

Warning: alerts the user to avoid electric shock.

Caution: identifies conditions and actions that may damage the Insulation Resistance

tester.

Operating Caution: identifies conditions where the user needs to take extra care during the

operation of the Insulation resistance tester

Danger: Use of this instrument in a manner not specified by the manufacturer may impair

safety features/protection provided by the equipment. Read all of the safety information

carefully before using or servicing the instrument.

This symbol indicates that the meter uses double or reinforced insulation.

Safety Notes

Do not exceed the maximum allowable input range for any of the meter’s functions.

Set the function switch OFF when the meter is not in use.

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

Warnings

Set the function switch to the appropriate position before measuring.

Do not measure current on a circuit whose voltage exceeds 600V.

When changing ranges always disconnect the test leads from the circuit under test.

Do not use the Insulation resistance tester if it is damaged or if metal parts are exposed. Also,

check the meter for cracks or missing plastic.

Be careful when working above 30V AC rms or 30V DC. Such voltages pose a shock hazard.

Discharge all circuit loads under test after measuring high voltage.

Do not replace the batteries with the tester in a wet environment.

Place the test leads in the proper input terminals. Ensure that the test leads are firmly

connected to the Insulation Resistance tester’s input terminals.

Ensure that the Insulation Resistance tester is switched off when opening the battery

compartment.

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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 batteries.

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.

Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty

of a definitive connection to the recessed electrical contacts. Other means should be used to

ensure that the outlet 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.

Do not use the Insulation resistance tester near explosive gas, vapor or dust.

When using the test leads, keep fingers away from the lead contacts. Keep fingers behind the

test lead finger guards.

Do not use the tester if its cover or any of its parts are removed.

When performing resistance tests, remove all power from the circuit under test.

When servicing the Insulation Resistance tester, use only the supplied test leads and power

adaptor.

Do not use the Insulation resistance tester if the battery indicator shows a low battery.

Do not use or store the meter in areas of high humidity, high temperature, potentially explosive

or flammable environments, or in strong magnetic fields.

Soft cloth and mild detergent should be used to clean the surface of the Insulation resistance

tester when servicing. Do not use abrasives or solvents.

Dry the Insulation resistance tester before storing if it is wet.

Remove the test leads and set the Range selector switch to the OFF position after use.

Safety Category Information

This Insulation resistance tester complies with IEC61010 standard safety measurement

requirements: pollution degree 2, over-voltage category (CAT. IV) 600V, with double insulation.

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Meter Description

1. Insulation resistance Test/Lock switch

2. REL /down button

3. HOLD button

4. BATT /up button

5. MAX /MIN /STOP button

6. LCD Display

7. DC power adaptor Input

8. EARTH Input

9. Vinput and IR GUARD terminal

10. VCOM input and High voltage

shielding terminal

11. LINE: 500V to 5000V High

Voltage Output

12. PI /DAR /PEAK button

13. Backlight /AUTO OFF button

14. Function Selector Switch

Display Description

1. Timed Test Indicators

2. AC/DC Indicators

3. Polarization Index and

Dielectric Absorption

Ratio Indicators

4. Analog Bargraph

5. Auto Range Indicator

6. Low Battery Indicator

7. High Voltage Indicator

8. Auto discharge Indicator

9. Continuity Buzzer Indicator

10. PASS /FAIL Indicator

11. Live Circuit Voltage Indicator

12. Units Indicator

13. Function Indicators

MAX

MIN

7891011

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Insulation Resistance Testing

CAUTIONS:

Ensure that no electrical charge exists on the circuit under test.

Insulated gloves should be worn while testing.

Use extreme caution to avoid touching the tips of the test leads or the circuit under test

when the PRESS TO TEST button is pressed; High Voltage is present.

Do not make measurements when the battery cover is removed.

Always connect the Earth Cord (black) to the Earth terminal of the circuit under test.

CAUTION: When the live circuit warning indicates “>30V” or the warning buzzer sounds and

the display flashes, the measurement cannot be made even if the

“Press to Test” button is pressed.

DANGER

Do not touch the circuit under test immediately after testing. Voltage stored in the circuit may

cause electric shock.

Leave the test leads connected to the circuit under test and never touch the circuit until the

discharge is complete.

PRESS TO TEST Knob

All insulation resistance tests are initiated with the PRESS TO TEST

knob.

1. Press and HOLD the knob to perform a test. Release the knob to

end the test.

2. Press and TURN the knob 90 degrees clockwise to the LOCK

position to lock the meter in the continuous test mode. To end a test,

either rotate the knob 90 degrees counterclockwise or press the

STOP button.

3. Always return the knob to the vertical position before beginning a

test.

Emergency Stop

To stop a test at any time, press the STOP button or rotate the PRESS TO TEST knob in a counter-

clockwise direction.

The STOP button also clears the display and beeper after a discharge is complete.

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Insulation Resistance Test

Manual Test

1. Connect the Black Earth test lead to the Earth

connector and the Red test lead to the LINE and

COM connectors.

2. Set the Function Selector switch to the desired

insulation test voltage.

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

4. Press and hold the PRESS TO TEST button to

run the test. The buzzer will beep during the

test.

5. Read the measured value on the LCD display.

6. Release the button to end the test and

discharge the device. While the circuit is

discharging, the icon will

flash. The measured value, HOLD and the

measurement time will remain in the display.

7. Press the STOP button to clear the display.

8. Set the Function Selector switch to OFF position and remove the test leads from the circuit.

Locked Test

1. Repeat steps 1 to 3 as above.

2. Press and turn the PRESS TO TEST button to the lock position to run the test. The buzzer will

beep during the test.

3. Read the measured value on the LCD display.

4. Rotate the PRESS TO TEST button to the PRESS TO TEST position to end the test and

discharge the device. While the circuit is discharging, the icon will flash. The

measured value, HOLD and the measurement time will remain in the display.

5. Press the STOP button to clear the display.

6. Set the Function Selector switch to OFF position and remove the test leads from the circuit.

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Timed Insulation Test

The timed insulation test feature allows the user to specify the period of time the test will run. The

run time can be set from 1 to 15 minutes in 1 minute increments.

1. Connect the Black Earth test lead to the Earth connector and the Red test lead to the LINE and

COM connectors.

2. Connect the test leads to the device under test.

3. Set the Function Selector switch to the desired insulation test voltage.

4. Use the Time Set and arrow buttons to select the desired run time for the insulation test.

The selected time will be shown in the lower left corner of the LCD.

5. Press and hold the PRESS TO TEST knob (or lock it). The beeper will sound and the voltage

warning icon will flash at one second intervals during the test.

6. At the end of the timed period, keep the test leads connected the meter will

the device and the results will be held in the display

7. Release or unlock the PRESS TO TEST knob and press the STOP button to clear the display.

8. Set the Function Selector switch to the OFF position and remove the test leads from the circuit.

Polarization Index (PI)

The polarization index Test calculates the ratio of the resistance measurement after 10 minutes to

the resistance measurement after 1 minute: Results are determined by the type, age and condition

of the insulation material tested. Established standards and test procedures should be used to

establish pass/fail criteria for each application.

Polarization Index = Resistance after 10 minutes / Resistance after 1 minute

1. Connect the Black Earth test lead to the Earth connector and the Red test lead to the LINE and

COM connectors.

2. Connect the test leads to the device under test.

3. Set the Function Selector switch to the desired insulation test voltage.

4. Use the PI/DAR button to select TIME 1 (1:00) for the Polarization Index (PI) function.

5. Press and hold the PRESS TO TEST button and turn it clockwise to the LOCK position. The

beeper will sound during the test.

6. When the test has completed, the LCD will display PASS if the Polarization Index is greater

than 1. FAIL will be displayed if the Polarization Index is below 1.

7. Keep the test leads connected to the equipment under test and release the PRESS TO TEST

button. The circuit will discharge through the meter. While the circuit is discharging, the

icon will flash.

8. Press the STOP button to clear the results

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Dielectric Absorption Ratio (DAR)

The dielectric absorption test calculates the ratio of the resistance measurement after one minute to

the resistance measurement after 30 seconds: Results are determined by the type, age and

condition of the insulation material tested. Established standards and test procedures should be

used to establish pass/fail criteria for each application.

Dielectric Absorption Ratio = Resistance after 1 minute / Resistance after 30 seconds

1. Connect the Black Earth test lead to the Earth connector and the Red test lead to the LINE and

COM connectors.

2. Connect the test leads to the device under test.

3. Set the Function Selector switch to the desired insulation test voltage.

4. Use the PI/DAR button to select the Dielectric Absorption Ratio function (DAR) for TIME1.

5. Press and hold the PRESS TO TEST button and turn it clockwise to the LOCK position. The

beeper will sound during the test.

6. When the test has completed, the LCD will display PASS if the Dielectric Absorption Ratio is

greater than 1. FAIL will be displayed if the Dielectric Absorption Ratio is below 1.

7. Keep the test leads connected to the device under test and release the PRESS TO TEST

button. The circuit will discharge through the meter. While the circuit is discharging, the

icon will flash.

8. Press the STOP button to clear the results

Insulation Resistance Measurement Considerations

The Resistance of an insulator is determined by applying a test voltage to the insulator and then

measuring the subsequent current flow.

Notes:

The insulation resistance of a device may not be stable therefore the readings supplied by

the meter may vary.

An audible beep will be heard while a test is in progress, this is normal.

Measurements taken on a capacitive load may take some time to complete.

Insulation Resistance tests output a positive (+) voltage from the Earth terminal and a

negative (-) voltage from the Line terminal.

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Use of the Guard Terminal

When measuring a cable, leakage current flowing on the surface of cable’s jacket and the current

flowing inside the cable’s insulator combine and may cause measurement errors. In order to prevent

such errors, a conductive wire should be wound around the point where leakage current flows. The

conductive wire should then be connected to the Guard terminal as shown in accompanying figure.

Be sure to use only the Guard cable supplied with this instrument to connect the instrument to the

Guard terminal.

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