Extech 380365 Instruction Manual

User's Manual

Autoranging Insulation Tester

with PC Interface

Model 380365

2

WARRANTY

EXTECH INSTRUMENTS CORPORATION warrants the basic 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] for authorization. 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 Insulation Tester. Special features include
Autoranging measurement display, RS-232 PC Interface for data acquisition, and backlit
LCD display with analog indicator. 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 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

3

Specifications

General specifications

Display Backlit 3-3/4 digit (4000 count) LCD with analog indicator
Sampling rate 2.5 samples/sec. (digital); 10 samples/sec. (analog)
Audible Continuity
Over range indicator "OL” displayed when measurement exceeds range limits
Low battery indicator " - +" symbol displayed when battery voltage is low
Power source Eight 1.5V AA cells
Pow er consumption 20 to 90mA depending upon function
Operating conditions 32 to 104oF (0 to 40oC); < 80% RH
Storage conditions 14 to 140oF (-10 to 60oC); < 80% RH
Dimensions 7.5 x 5.5 x 3” (190 x 140 x 77mm)
Weight 2 lbs (900g)

Range Specifications

Resistance

Range Res. Accuracy Max. open

400Ω 0.1 Ω

Short circuit current: 280mA (min. 200mA)

Continuity

Range Res. Audible tone Max. open circuit Volt Overload Protect.

200Ω 0.1Ω < 40Ω

AC Voltage (40 to 500Hz)

Range Res. Accuracy Input impedance Overload Protect.

600VAC 1V ±1.5% + 3d

Megohmmeter (Auto Range)

Range Res. Accuracy Terminal voltage

4M /40M /400M / 4000MΩ /

250V

4M /40M /400M / 4000MΩ /

500V

4M /40M /400M / 4000MΩ /

1000V

Test Current / Load Short circuit I

4000MΩ / 250V 250KΩ
4000MΩ / 500V 500KΩ

4000MΩ / 1000V

Note: Accuracies are specified as % reading + digits at 23oC < 80% RH

200Ω range with audible tone when resistance < 40Ω

±1% + 5d 12.8V 220Vrms

1kΩ

1mA

circuit Volt

12.8V (200mA) 220Vrms

4.5MΩ

±3% + 5d
(<2000MΩ)
±5% + 5d
(>2000MΩ)

1MΩ

250V + 20% ~ -0%

500V + 20% ~ -0%

1000V + 10% ~ -0%

< 1.5mA

Overload

Protect.

220Vrms