User Guide
Model 380363
Insulation Tester / Megohmmeter
Introduction
Congratulations on your purchase of Extech’s Insulation Tester/Megohmmeter. The Model
380363 provides three test ranges plus continuity and AC/DC voltage measurement. Manual
datalogging stores up to 9 data sets. This professional meter, with proper care, will provide
years of 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
Specifications
General specifications
Display 3-3/4 digit (4000 count) LCD
Sampling rate 1 reading per second
Test ranges
AC/DC Voltage range 999V
Resistance range
Lo Resistance range
Over range indicator ‘OL’ displayed when measurement exceeds range
Zero adjust Automatic
Memory Nine (9) data records
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)
Fuse protection 0.5A / 600V fast blow fuse
Operating conditions 32 to 122oF (0 to 50oC); 80% RH
Dimensions 9.3 x 4.6 x 2.1” (235 x 116 x 54mm)
Weight 1.15 lbs (520g)
Safety ratings Pollution degree 2; indoor use; CE marked;
Category Rating CAT III-1000V
Resistance: 4MΩ, 40MΩ, 400MΩ, 4000MΩ, 10GΩ
Test Voltages: 250V, 500V, 1000V
9999Ω
40Ω
Meets IEC 61010-1 and IEC 61557 standards
2
Model 380363 Version 2.0 July 2005
Range Specifications
MEGOHMMETER RANGES
Range Test Voltages Resolution Accuracy
4MΩ 0.001MΩ
40MΩ 0.01MΩ
400MΩ 0.1MΩ
4000MΩ 1MΩ
10GΩ
250V (+30% ~ -0%)
500V (+30% ~ -0%)
1000V (+30% ~ -0%)
00.01GΩ
3%+5 (<1000M)
5%+5 (>1000M)
(% reading + digits at
o
23
C ± 5oC < 80% RH)
Analog Bar Graph 0 to 10G
Nominal Current
Circuit Protection
≧ 1mA
Test inhibited if input ≧ 30V AC or DC
AC VOLTAGE (40Hz-500Hz)
Range Res. Accuracy Input impedance Overload
Protection
999VAC 1V ±2% + 2d
9MΩ
1000Vrms
DC VOLTAGE
Range Res. Accuracy Input impedance Overload
Protection
999VDC 1V ±1% + 2d
9MΩ
1000Vrms
RESISTANCE & CONTINUITY
Range Res. Accuracy Max. open circuit
Resistance: 999.9Ω 0.1Ω
Continuity
±1% + 3d 3V 1000Vrms
100Ω ± 80Ω)
Volt
Overload
Protect.
LOW RESISTANCE Ω
Range Res. Accuracy Max. open
circuit Volt
40Ω 0.01Ω
±2% + 2d 6V >30V AC/DC
Overload
Protection
3
Model 380363 Version 2.0 July 2005