Extech 380353 Operating Manual

User's Manual

High Voltage Megohmmeter

Analog Insulation Tester
plus AC Voltage and Continuity Tests

Model 380353

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 [phone] 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 Extech’s High Voltage Megohmmeter. This meter is
geared toward high voltage insulation testing applications such as appliance testing. In
addition to Megohmmeter (Insulation Resistance) measurements, low resistance and AC
Voltage can be measured. 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
(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 conductor 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

Rated Environmental Conditions

Caution, refer to this manual before using this meter

Dangerous Voltages

Meter is protected throughout by double or reinforced insulation

• Indoor use only

• Installation Category III

• Pollution degree 2

• Altitude up to 2000 meters

• Ambient conditions: Temperature: 32 to 104

o

F (0 to 40oC); RH: 80% max.

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Model 380353 V1.4 02/05

Specifications

General specifications

Display Taut band multi-scale analog display with status indicators

Live circuit indicator LED lights when live circuit is sensed

Withstand voltage Meets IEC-1010 safety requirements for Cat. III 600V

Power source Eight (8) 1.5 AA cells

Power consumption Megohmmeter: 190mA; Continuity: 120 mA (approx.)

Fuse protection 250V (1A) for Insulation Resistance and Continuity Tests

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

Dimensions 6.7 x 6.5 x 3.6” (170 x 165 x 92mm)

Weight 2.1 lbs (970g)

Standards

Low Resistance

Range Accuracy Overload Protect.

0 to 50Ω

Open Circuit V: approx 600mV, Short circuit A: approx. 240mA

AC Voltage

Range Accuracy Line Frequency

600VAC ± 5% of full scale 40Hz to 1kHz

Insulation Resistance / Megohmmeter

Voltage (±10%) Range Accuracy

250VDC
500VDC

1000VDC

and zero adjust

C

C

±5% of reading 250V

0 to 50MΩ
0 to 100MΩ
0 to 400MΩ

Short circuit current: 2mA, Overload Protection: 250V

± 5% of reading

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Model 380353 V1.4 02/05