Extech Extech 380360 Manual
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
User Guide
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Model 380360
Insulation Tester / Megohmmeter
Introduction
Congratulations on your purchase of Extech’s Insulation Tester/Megohmmeter. The Model
380360 provides three test ranges plus continuity and an AC voltage test. A handy 3-minute
test lock feature and a data hold switch are also included. This professional meter, with
proper care, will provide years of reliable service.
Test Equipment Depot, 99 Washington Street, Melrose, MA 02176
781.665.1400 | 800.517.8431 | Fax: 781.665.0780
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
Specifications
General specifications
Display 0.65” 3-1/2 digit (2000 count) LCD
Sampling rate 2.5 readings per second
Test ranges
AC Voltage range 600VAC
Resistance range
Over range indicator ‘1____’ displayed
Zero adjust Automatic
Low battery indicator ‘BT’ symbol displayed when battery voltage is low
Power source Six (6) 1.5 ‘AA’ batteries
Power consumption 20 to 95mA (depending upon function)
Operating conditions 32 to 104oF (0 to 40oC); 80% RH
Dimensions 6.5 x 3.9 x 2.2” (165 x 100 x 57mm)
Weight 1.1 lbs (500g)
2000MΩ/1000VDC, 200MΩ/500VDC, 200MΩ/250VDC
200Ω
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Model 380360 Version 1.7 September 2003
Range Specifications
Accuracies are specified as % reading + digits at 23
o
C < 80% RH
RESISTANCE
Range Res. Accuracy Max. open
circuit Volt
200Ω 0.1 Ω
±1% + 2d 3.3V 500Vrms
Overload
Protect.
CONTINUITY
Range Res. Audible tone Max. open
circuit Volt
200Ω 0.1Ω < 100Ω
3.3V 500Vrms
Overload
Protect.
AC VOLTAGE
Range Res. Accuracy Input impedance Overload
Protect.
600VAC 1V ±0.8% + 3d
10MΩ
750Vrms
MEGOHMMETER RANGES
Range Res. Accuracy Terminal voltage
200MΩ / 250VDC
200MΩ / 500VDC
0 to 1000MΩ / 1000VDC
1000 to 2000MΩ / 1000VDC
0.1MΩ
1MΩ
±3% + 5d
±5% + 5d
250V + 10% ~ -0%
500V + 10% ~ -0%
1000V + 10% ~ -0%
Range Test Current / Load Short circuit Current
200MΩ / 250VDC 250KΩ
200MΩ / 500VDC 500KΩ
0 to 1000MΩ / 1000VDC
1000 to 2000MΩ / 1000VDC
1mA
< 1.5mA
1MΩ
Application Note for Large Installations
In large wiring installations where the insulation of outlets is being tested, more than one
insulation resistance measurement may have to be made to take into account parallel
resistances. Divide large systems into subgroups and test subgroups individually. Also, in
large installations, the capacitance of the insulation will be high, thereby taking longer to
charge when being tested. Care must be taken not to finish a measurement until the
insulation capacitance is fully charged (a steady, stable reading is an indication that this is
the case). Be careful not to turn the range switch while the test button is pressed.
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Model 380360 Version 1.7 September 2003
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