Aemc instruments 1025, 1020 User Manual

Megohmmeters
Model 1020
Model 1025

Chauvin Arnoux, Inc. d.b.a. AEMC® Instruments

99-MAN-100110 Rev 02 06/97

Megohmmeters

!

MΩ

500 V

Ω

+ Earth

- Line

TEST

TIMER

DATA HOLD

Man.

3 Min.

1000 V

MΩ

250 V

VAC

~

/ΩV

AC

~

OFF

ON

M Ω

MEGOHMMETER

MODEL 1025

Model 1020
Model 1025

USER MANUAL

Owner’s Record

The serial number for the Megohmmeter Model 1020 or Model 1025
is located on the back of the instrument. Please record this number
and purchase date for your records.

MEGOHMMETER MODEL 1020
CATALOG # 2111.91
SERIAL #:
PURCHASE DATE:
DISTRIBUTOR:

MEGOHMMETER MODEL 1025
CATALOG # 2111.87
SERIAL #:
PURCHASE DATE:
DISTRIBUTOR:

99-MAN-100110
2nd Revision
Printed 07/97

AEMC®Instruments
by Chauvin Arnoux, Inc.

Table of Contents

Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . . . . . .2

Receiving Your Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Safety Check/Voltage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Insulation Resistance Testing (MΩ Range) . . . . . . . . . . . . . . . . . .9

Test Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Spot Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Ratio Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

For Successful Insulation Resistance Testing . . . . . . . . . . .11

Insulation Measurement - Connections . . . . . . . . . . . . . . .12

Insulation Resistance Measurements on Motors . . . . . . . .15

Continuity Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Resistance Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Data Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Repair and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

(North/South America, Australia, New Zealand) . . . . . . . . .20

(Europe, Asia, Africa) . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Technical and Sales Assistance . . . . . . . . . . . . . . . . . . . . . . . . .22

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Warning

!

These safety warnings are provided to ensure the safety of per­sonnel and proper operation of the instrument.

• Read this instruction manual completely before attempting to
use or service this instrument and follow all safety information.

• Safety is the responsibility of the operator!

• Tests are to be carried out only on dead circuits! Check for live
circuits before making resistance measurements (safety
check).

• Always make connections from the instrument to the circuit
under test.

• The Megohmmeter Models 1020 and 1025 are sources of high
voltage, as is the sample connected to them. All persons per­forming or assisting in the tests must employ all safety precau­tions to prevent electrical shock to themselves and to others.

• AEMC®considers the use of rubber gloves to be an excellent
safety practice even if the equipment is properly operated and
correctly grounded.

• When testing capacitance samples, make sure that they have
been properly discharged and that they are safe to touch.
Dielectric insulation samples should be short-circuited for at
least five times the amount of time they were energized.

• Never open the back of the instrument while connected to any
circuit or input.

International Electrical Symbols

This symbol signifies CAUTION! and requests that the user
refer to the user manual before using the meters.

2

Megohmmeter Models 1020 and 1025

Receiving Your Shipment

Upon receiving your shipment, check to be sure that the contents
agree with the packing slip. Notify your distributor at once of any
shortages. If the equipment appears to be damaged, file a claim
immediately with your carrier, and notify your distributor at once, giv­ing a detailed description of the damages. Save the damaged pack­ing container to substantiate your claims.

Packaging

Megohmmeters Model 1020 (Cat. #2111.91) and Model 1025 (Cat.
#2111.87) are shipped with a carrying case, two color-coded leads,
six 1.5 V “AA” batteries, and an instruction manual.

Description

Model 1020 and Model 1025 are compact, light-weight, battery-oper­ated, digital megohmmeters. The Model 1020 tests at 250 V and 500
V up to 200 MΩ. The Model 1025 adds an additional voltage range of
1000 V, and measures up to 2000 MΩ.

The Models 1020 and 1025 also feature a continuity test range with
an audible beeper for resistances under 100Ω, and a 600 V AC range
for safety voltage check.

The press-to-test button has an associated locking feature for contin­uous tests up to three minutes, eliminating the need to hold down the
button manually.

Other features include a large 3-1/2 digit LCD, automatic zero, data
hold switch, and low battery indicator. These light-weight, easy-to-use
megohmmeters can be used for most commonly performed insulation
tests, such as on cables, switch gear, motors, DC generators, power
tools, and small appliances.

The Models 1020 and 1025 include test leads, batteries, carrying
case, and user manual.

Megohmmeter Models 1020 and 1025

3

Models 1020/1025 Features

• Model 1020 measures insulation at 250 and 500 V.

• Model 1025 measures insulation at 250, 500, and 1000 V.

• Continuity test

• Continuity beeper

• 600 V AC safety test voltage range

• Large, easy-to-read digital display

• Data hold switch

• Three-minute “lock-on” test button for hands-free operation

• Automatic discharge when test button is released

• Low battery indication

4

Megohmmeter Models 1020 and 1025

Models 1020/1025 Specifications

ELECTRICAL SPECIFICATIONS

INSULATION TESTS

DC Test Voltage:

250 V and 500 V (Model 1020)
250, 500, 1000 V (Model 1025)

Megohm Range:

0.1 to 200 MΩ (Model 1020 and 1025)
1 to 2000 MΩ (Model 1025 @ 1000 V)

Resolution:

250 and 500 V : 0.1 MΩ
1000 V : 1 MΩ

Short Circuit Current:

0.4 mA max. at 250 V

0.9 mA max. at 500 V

1.7 mA max. at 1000 V

Accuracy:*

0.1 to 1000 MΩ: 3% of reading ± 3 digits
1000 to 2000 MΩ: 5% of reading ± 3 digits (Model 1025 only)

Test Voltage Generation:

Solid state circuitry generating test voltage (± 10%).

RESISTANCE TESTS (Ω)

Range: 0.1 to 200Ω
Accuracy:* 1% of reading ± 2 digits
Maximum Open Circuit Voltage: 3.3 V
Overload Protection: 500V DC/AC

*Accuracies are at 23° C ± 5° C, below 80% RH

Megohmmeter Models 1020 and 1025

5

CONTINUITY TESTS (Ω)

HO

Range: 0 - 100Ω (with display and beeper)
Resolution: 0.1Ω
Operation Resistance: < 100Ω
Max. Open Circuit Voltage: 3.2 V
Overload Protection: 500 V DC/AC

VOLTAGE TESTS SAFETY CHECK (VAC)

~

Range: 0 - 600 V AC
Resolution: 1 V
Accuracy:* 0.8% of reading ± 3 digits
Input Impedance: 10 MΩ

GENERAL SPECIFICATIONS

Power Supply: Six 1.5 V “AA” batteries
Low Battery Indication: Indicator on LCD
Display: 3-1/2 digit LCD, 0.65” height
Overrange Indicator: Highest digit of (1) displayed
Operating Temperature: 32° to 104°F (0° to 40°C)
Storage Temperature: 14° to 140°F (-10° to 60°C)
Operating Humidity: 0 - 80% RH
Storage Humidity: 0 - 70% RH
Dimensions: 6.5 x 3.9 x 2.2” (165 x 100 x 57mm)
Weight: 1.1 lb (500 g) approx.

*Accuracies are at 23° C ± 5° C, below 80% RH

6

Megohmmeter Models 1020 and 1025