Extech Instruments 380385 Manuale utente

User's Manual

10KV Digital High Voltage Insulation Tester

Model 380385

380385 V1.5 3/04

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.

Introduction

Congratulations on your purchase of the Extech High Voltage Insulation Tester. This

device has four pre-set voltage test ranges (up to 10kV) and measures insulation

resistance to 500GΩ. Other voltage test values can be selected using the ±500V step

buttons. This professional meter, with proper care, will provide years of safe reliable

service.

Safety

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

2. Circuit connections must not be touched during a test.

3. After insulation tests, capacitors must be discharged.

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

broken or cracked insulation.

5. When servicing, use only specified replacement parts.

6. Environmental conditions:

•Indoor use only; Installation category III 300V

•Pollution degree 2

•Altitude up to 2000 meters

•Relative Humidity 80% max.; Temperature 0 to 40oC

International Safety Symbols

Caution, refer to this manual before using this meter

Dangerous Voltages; risk of electric shock

Meter is protected throughout by double or reinforced insulation

380385 V1.5 3/04

Specifications

General specifications

Display 2 x 20 character alphanumeric multi-function dot matrix

Range selection 20 ranges in 500V steps with automatic ranging.

Preset buttons for 1KV, 2.5KV, 5KV, and 10KV

Bargraph Displays voltage ramp, soak, and decay

Automatic discharge After automatic & manual stop or upon completion of test

Low battery indicator "Replace battery" displayed when battery voltage is low

Power source Eight 1.5V ‘C’ cells; Battery life 40 hrs (no load at 10kV)

Auto Power off After 5 minutes of inactivity

EnersaveTM mode Shorter test time to conserve battery life

Test Leads Supplied. RED (length = 108”) with GREEN guard lead.

BLACK lead is 42”.

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

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

Dimensions 13 x 10.2 x 6.3” (330 x 260 x 160mm)

Weight 7.9 lbs (3.6kg)

Range Specifications

DC Test

Voltages

Resistance

Ranges (in GΩ)

Short Circuit

Current

Accuracy Resolution

0.5KV 25

1KV 50

1.5KV 75

2KV 100

100mA

2.5KV 125

3KV 150

3.5KV 175

4KV 200

4.5KV 225

5KV 250

120mA

5.5KV 275

6KV 300

6.5KV 325

7KV 350

7.5V 375

8KV 400

8.5KV 425

9KV 450

9.5KV 475

170mA

10KV 500 360mA

± (3% + 2d)

1MΩ

Note: Voltage Regulation is +20% -5% unless current limited.

380385 V1.5 3/04

Meter Description

1. Test lead jacks

2. Dot Matrix Display

3. Keypad

4. Battery compartment (on bottom)

5. Test lead compartment latch

Preparation

Warning: Ensure that the circuit under test does not include devices or components that

can be damaged by 10KVDC; such devices include power factor correction capacitors, low

voltage mineral insulated cables, electronic light dimmers, ballasts and starters for

fluorescent lamps.

Connecting the Test Leads to the meter

The Black (Earth), Red (Line), and Green (Guard) test leads connect to the meter

directly above the dot matrix display (the meter jacks are color coded). NOTE: The Green

(Guard) lead is attached to the Red lead and should be used (refer to applications section

next).

Connecting the Test Leads to the device under test

The Black (Earth) lead is connected to the conductive material. The Red (Line) and

Green (Guard) leads are connected to insulating, sheathing, and covering material as

shown in the following applications section.

380385 V1.5 3/04

Operation

Powering the meter

Press the ON button to turn the unit on. Press the OFF button to turn the unit off.

Insulation Resistance Measurements

Warning: The circuit under test must be completely de-energized and isolated before

making test connections.

1. After turning the unit on, the display will prompt the user

to select a test voltage (diagram at right).

2. Select the test voltage by pressing one of the preset

voltage buttons (1KV, 2.5KV, 5KV, 10KV) or by pressing the Voltage Adjust buttons

(500+, 500-) to step through the available test voltages in 500V steps.

3. The resistance range for the selected voltage is indicated on the dot matrix display as

shown above.

4. Press the TEST START / STOP button again.

5. The display will prompt the user to connect the leads.

Press the TEST START/STOP button to start testing.

6. The elapsed test time appears on the upper line (right

hand side) of the display. The resistance reading is shown on the upper left hand side

of the display. The lower line shows the test voltage in bargraph format (see diagram

at right).

7. The HOLD icon will appear in place of the bargraph

when the test is complete and the voltage has been

discharged.

WARNING: DO NOT REMOVE THE TEST LEADS BEFORE THE HOLD DISPLAY

APPEARS.

8. The meter automatically discharges the system at the end of the test.

9. The meter automatically powers down after 5 minutes.

The EnersaveTM Mode

EnersaveTM mode conserves battery life by performing a relatively short test (10 seconds).

The EnersaveTM mode is the default test mode. To bypass this mode and run a longer test

(100 seconds max), press and hold the TEST button for 3 seconds when starting a test.

Bargraph Voltage Display

The bargraph represents the voltage present on the test leads as it rises, soaks, and

decays. The bargraph appears on the lower left of the dot matrix display during a test.

Automatic Under/Over Range Resistance Detect

If the display shows the message “LOW MΩ”, the test should be interrupted immediately

by pressing the TEST button. This message indicates that the insulation under test has

broken down and the meter is trying to inject a high potential onto a short circuit. If ‘HIGH’

appears, it is likely that the test configuration is open. Check the test set-up then test

again.

Elapsed Timer

The test duration is indicated on the display. This is particularly useful in determining

whether an insulating material under test will break down in a given amount of time.

Select Voltage:

250000MΩV = 5000V

Connect Leads . . . .

. . . . . . Press TEST

R=9.998M

Ω

6.8s

0> ██████ <500V

380385 V1.5 3/04

Manual Test STOP

To stop a test in progress, press the TEST button. The test will immediately end and the

system will automatically discharge.

Automatic Test STOP

When in the default EnersaveTM mode, the test automatically stops after approx. 10

seconds. The test automatically stops after approx. 100 seconds if the meter is not in the

EnersaveTM mode.

Live Circuit Warning

If the test leads are connected to a live circuit (approx. 500V), a warning beeper will sound

and the meter will display “Live Warning…Circuit Live…”. In this case, correct the problem

and retest.

Automatic Discharge

At the end of a test, the meter automatically discharges the high voltage. The automatic

discharge status is reflected on the display. During discharge the beeper will sound and,

when completely discharged, the HOLD icon appears on the display.

Applications

Measuring Power Tools and Small Appliances

For small appliances, connect the Black (EARTH) lead to conductors and the Red (LINE)

lead to insulating material.

For single or double insulated power tools, one lead should be connected to the device’s

chuck, blade, etc. and the other lead to one of the AC power cord conductors (test both

conductors in turn). Refer to the power tool application diagram below.

Testing Motors

AC Motors

Disconnect the motor from the line by:

a. Disconnecting the wires from the

motor terminals or

b. Opening the main switch

If the main switch is opened, and the

motor also has a motor-starter, then

the starter must be held in the ON position. With the main 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 the RED lead to the grounded motor housing and the BLACK lead to

one of the motor leads.

Plug For 2 or 3 prong plugs, connect the

RED lead to one conductor at a time

Connect the BLACK

lead to the chuck

Connect RED lead

to grounded housing

Connect BLACK lead

to the motor leads

380385 V1.5 3/04

DC Motors

1. Disconnect the motor from the line.

2. To test the brush rigging, field coils and armature, connect the RED lead to the

grounded motor housing and the BLACK 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 by

connecting one lead to each individually, leaving the other connected to the grounded

motor housing. This also applies to DC Generators.

Testing Single Conductor Cables

1. Completely disconnect the cable

under test from its source and

destination.

2. Connect the test leads to the

cable as shown at right.

Testing Multi Conductor Cables

1. Completely disconnect the cable under test from its source and destination.

2. Refer to the diagrams below for three possible tests.

Transformer Testing

Transformer tests are performed with the transformer completely disconnected from the

line and the load. Note that the case ground should not be removed.

The five tests listed below will completely test a single-phase transformer. Note that at

least 1 minute should be allowed

between each test.

1. High voltage winding to low voltage

winding and ground

2. Low voltage winding to high

voltage winding and ground

3. High voltage winding to low voltage

winding (pictured at right)

4. High voltage winding to ground

5. Low voltage winding to ground

Core Insulation Sheath Covering

EARTH GUARD LINE

Testing one conductor to

all of the conductors Testing one conductor

to earth One conductor to all

minus ground

EARTH

LINE

EARTH

GUARD

LINE

EARTH

Connect the

BLACK lead here Connect the

RED lead here

380385 V1.5 3/04



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: [email protected]

Website: www.extech.com

Maintenance

Battery Replacement

When ‘REPLACE BATTERY’ appears on the display, replace the eight 1.5V ‘C’ batteries.

1. Ensure that the meter is powered down and that the test leads are not connected

2. Close the instrument cover and turn the instrument upside down

3. Remove the screw located on the bottom of the meter

4. Remove the battery compartment cover

5. Replace the eight batteries ensuring proper polarity

6. 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.

Repair and Calibration

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

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

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