Extech 380366 Operating Manual
User's Manual
Autoranging Datalogging Insulation Tester
(Megohmmeter)
with PC Interface
Model 380366
Introduction
Congratulations on your purchase of the Extech 380366 Datalogging Insulation Tester.
The 380366 measures insulation resistance to 4000MΩ and includes Continuity and
Voltage tests. The built-in datalogger remotely stores approx. 16,000 readings for later
transfer to a PC. The tester can also take and record readings to a PC in real time. This
professional tester, 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
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
Datalogger memory 16,000 readings
Datalogger Sample
Rate
Power source Eight 1.5V AA cells
Power consumption 20 to 90mA depending upon function (40 hours typical)
Environmental CAT III; Altitude: 2000 meters; for indoor use only
Operating conditions 32 to 104oF (0 to 40oC); < 80% RH
Storage conditions 14 to 140oF (-10 to 60oC); < 80% RH
Dimensions/Weight 7.5 x 5.5 x 3” (190 x 140 x 77mm) / 2 lbs (900g)
Environmental specifications
• Installation Category III 600V
• Pollution Degree 2
• Altitude up to 2000 meters
• Intended for indoor use only
Low resistance range with audible continuity < 40Ω
Programmable: 1 to 65,400 sec/sample or single manual
record
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Range Specifications
Resistance / Audible Continuity
Range Resolution Accuracy Max. open
400 Ω 0.1 Ω
Short circuit current: 280mA (min. 200mA)
AC Voltage (40 to 500Hz)
Range Resolution Accuracy Input
600VAC 1V ±1.5%rdg + 3d 4.5MΩ 750Vrms
Megohm (Auto Range)
Voltage Ranges Maximum
250V +20% ~ -0%
500V +20%~ -0%
1000V
Voltage Range 1mA Test Current Short Circuit
Note: Accuracies are specified as % reading + digits at (73°F ± 9°F) 23
4, 40, 400,
4000MΩ
250V @250KΩ
500V @500KΩ
1000V
±1%rdg + 5d 12.8V 220Vrms
Audible tone when Resistance <40Ω;
Resolution
1kΩ
4000MΩ
±3%rdg + 5d (<2000MΩ)
±5%rdg + 5d (>2000MΩ)
circuit voltage
impedance
Resistance
Accuracy
@1MΩ
Overload
Protection
Overload
Protect.
Voltage
Accuracy
+10%~ -0%
Current
< 1.5mA
o
C ±5oC < 80% RH
Meter Description
1. LCD Display
2. Megohmmeter TEST pushbutton
3. Test LOCK and DATA HOLD button
4. RECORD button
5. LCD Backlight / Wake button
6. Function select switch
7. Storage compartment
8. RS-232 interface jack
9. Test Lead input jacks (HI & LO)
10. Test Leads
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380366 V1.6 11/04
Operation
Warning
Ensure that the circuit under test does not include components that can be damaged by 1000VDC; such
devices include power factor correction capacitors, low voltage mineral insulated cables, electronic light
dimmers, and ballasts/starters for fluorescent lamps.
Connecting Test Leads
For all functions (Megohmmeter, Resistance, Continuity and AC Voltage), connect the red
test lead to the HI terminal and the black lead to the LO terminal.
Test Lead Check
1. Connect the red test lead to the HI input terminal; black lead to the LO terminal.
2. Set the rotary switch to the resistance/ continuity position ( .
3. Touch the test lead tips together. Resistance should be less than 1Ω and the audio
tone should sound.
4. With the leads not touching, the display should read “-OL-“. (over range).
5. If any readings are displayed other than the readings just described, the test leads
should be considered faulty and must be replaced before using the meter. Failure to
do so could result in damage to equipment and electrical shock.
Insulation Resistance Measurements (Megohmmeter Tests)
Warning: Do not perform Insulation Resistance measurements if AC Voltage is present on circuit under test.
1. Connect the red test lead to the HI input terminal; black lead to the LO terminal.
2. Set the rotary switch to the desired function.
3. Connect the tips of the test leads to the equipment under test.
4. Press and hold down the red TEST button. Release the test button to stop the test. The
meter will then hold the resistance reading. This is indicated by the H icon in the upper
left corner of the display.
5. To clear the display, press the LOCK/HOLD button twice.
Note that the charge stored on the device under test will be automatically discharged
when the testing process is finished
3-Minute Test
For hands-free operation, use the Test Lock feature.
1. Connect the red test lead to the HI input terminal; black lead to the LO terminal
2. Set the rotary switch to the desired function.
3. Connect the tips of the test leads to the equipment under test.
4. Press the LOCK button. The LOCK icon will be displayed. Press the red TEST button.
A 3-minute continuous test will begin. The red TEST button can be pressed at any
time to end the test. If the TEST button is not pressed the meter automatically stops
the test after 3 minutes. The meter will then hold the resistance reading. This is
indicated by the H icon in the upper left corner of the display.
5. To clear the display, press the LOCK/HOLD button twice.
Note: The symbol will appear in the upper right corner of the display and an audible
tone will sound whenever the high voltage is applied to the test leads.
Ω)
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