Extech Instruments 380260 User manual
User Guide
Model 380260
Insulation Tester / Megohmmeter
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Introduction
Congratulations on your purchase of Extech’s Insulation Tester/Megohmmeter. The Model 380260
provides three test ranges plus continuity and AC/DC voltage measurement. A handy test lock feature
and a data hold function are also included. 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
Meter Description
1. LCD Display
2. Hold Button
3. Test Button
4. Rotary Switch
5. Backlight Button
6. Lock Button
7. Input Terminals
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Operation
Connecting Test Leads
For all measurements, connect the red test lead to the Vinput terminal and the black test lead to
the COM input terminal.
Test Lead Check
1. Set the rotary switch to the 200range.
2. Touch the test lead tips together.
3. Resistance should read less than 0.5and the audio tone should sound.
4. With the leads not touching, the display should read infinity indicated by “1”.
5. Readings displayed other than the readings described above are indicative of a test lead
problem. The test leads 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 the device
under test.
1. Connect the red test lead to the Vinput terminal; black lead to the COM terminal.
2. Set the function switch to the desired Mtest voltage position.
3. Connect the tips of the test leads to the equipment under test. If there is a voltage present, a
constant beep will sound and the voltage will be displayed.
4. The display will show “1“until the TEST button is pushed. Press and hold the TEST button. The
upper right display shows the test voltage applied and the flashing high voltage symbol will
be displayed. The main display shows the resistance.
5. Keep the test leads connected to the equipment under test and release the TEST button. The
circuit will discharge through the meter. Keep the test leads connected until the circuit is
completely discharged and the upper right display shows 0 volts.
Lock Function
For hands-free operation, use the LOCK feature.
1. With the test leads connected to the equipment under test, simultaneously press the TEST and
LOCK keys.
2. The LOCK icon” ” will appear on the display. A beeper will sound every 2 seconds to
indicate that the meter is in Lock mode.
3. Press the LOCK key to disable the Lock function and end the test.
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.
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Notes on IR (Megohmmeter) testing:
1. The maximum measurement range for the 380260 is 2000M. Frequently, insulation
resistance will exceed this value. When this happens, the display will indicate “1”, meaning
the resistance is very high and the insulation being tested is good.
2. If the device being tested is highly capacitive, the display will indicate an increasing
resistance value over time. Always wait until the reading has stabilized before recording the
value.
AC/DC Voltage Measurement
1. Set the Rotary switch to the ACV or DCV position.
2. Connect the red test lead to the Vterminal and the black test lead to the COM terminal.
3. Connect the test leads to the circuit under test.
4. Read the voltage value on the LCD.
Resistance Measurement
WARNING
Do not run this test unless ACV = 0. Do not use this mode to check diodes.
1. Set the Rotary switch to the 200kposition.
2. Connect the red test lead to the Vterminal and the black lead to the COM terminal.
3. Connect the tips of the test leads to the circuit under test.
4. Read the resistance value on the display.
Low Resistance (Continuity) Measurement
1. Set the Rotary switch to the 200position.
2. Connect the red test lead to the Vterminal and the black lead to the COM terminal.
3. Connect the tips of the test leads to the circuit under test.
4. Read the resistance value on the display. When the resistance of a circuit is less than approx.
40 the audible tone will sound.
Auto Power Off
To conserve battery life, the meter will automatically turn off after approx. 15 minutes of non-use. To
turn the meter back on, turn the rotary switch to OFF, then to the desired function.
Hold Function
The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or
to exit the hold function
Backlight
Press the key for to turn on the display backlight function. The backlight will automatically turn off
after 15 seconds.
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Notes:
1. The STARTER must be in the ON position during the
Motor Starter Mains
Switch Line
GND
Applications
Measuring Power Tools and Small Appliances
This section applies to any device under test that uses a line cord. For
double insulated power tools, the meter’s leads should be connected to
the device’s housing (chuck, blade, etc.) and the lines of the power
cord.
Testing AC Motors
Disconnect the motor from the line by disconnecting the wires from the motor terminals or opening
the mains switch.
If the mains switch is opened, and the motor also has a motor-starter, then the starter must be held
in the ON position. With the mains switch opened, the measured resistance will include the
resistance of the motor wire and all other components between the motor and the main switch. If a
weakness is indicated, the motor and other components should be checked individually. If the motor
is disconnected at the motor terminals, connect one meter lead to the grounded motor housing and
the other lead to one of the motor leads. Refer to diagram at below.
Testing DC Motors
1. Disconnect the motor from the line.
2. To test the brush rigging, field coils and armature, connect one meter lead to the grounded
motor housing and the other lead to the brush on the commutator.
3. If the resistance measurement indicates a weakness, raise the brushes off of the commutator
and separately test the armature, field coils and brush rigging (one at a time). Leave one lead
connected to the grounded motor housing while testing the motor components. This also
applies to DC Generators.
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Testing Cables
1. Disconnect the cable under test from the line.
2. Disconnect the opposite end of the cable to avoid errors as a result of
leakage from other equipment.
3. Check each conductor to ground and/or lead sheath by connecting one
meter lead to ground and/or lead sheath and the other meter lead to
each of the conductors in turn.
4. Check insulation resistance between conductors by connecting meter
leads to conductors in pairs. Refer to diagram at right.
Specifications
Range Specifications
Accuracies are specified as % reading + digits at 23oC ± 5oC < 80% RH
MEGOHMMETER RANGES
Range Resolution Accuracy Terminal Voltage
200M250V 0.1M±3% + 5d 250V + 10% ~ -0%
200M500V 0.1M±3% + 5d 500V + 10% ~ -0%
0-1000M1000VDC1M±3% + 5d 1000V + 10% ~ -0%
1000-2000M1000VDC 1M±5% + 5d 1000V + 10% ~ -0%
Range Test Current Short Circuit Current
200M250V
1mA
250k(load)
<1mA
200M500V 500k(load)
0-1000M1000VDC1M
1000-2000M1000VDC
AC VOLTAGE (40Hz-400Hz)
Range Resolution Accuracy Input Impedance Overload
Protection
750VAC 1V ±1.2% + 10d 10M750Vrms
DC VOLTAGE
Range Resolution Accuracy Input Impedance Overload
Protection
1000VDC 1V ±0.8% + 3d 10M1000Vrms
RESISTANCE
Range Resolution Accuracy Max. Open Circuit
Voltage
Overload
Protection
2000.1±1% + 2d 4.5V 250Vrms
200k0.1k±1% + 2d 3V 250Vrms
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General specifications
Display LCD with dual display
Sampling rate 2.5 readings per second
Continuity beeper, short circuit current <200mA, open circuit voltage 4.5V
Over range indicator ‘1’ displayed
Zero adjust Automatic
Low battery indicator Low battery symbol displayed when battery voltage is low
Environmental Installation category II, Pollution Degree 2, Altitude up to 2000
meters, Indoor use only
Power source Six (6) 1.5 ‘AA’ batteries
Fuse 250mA/600V ceramic 3AG Fast blow
Operating conditions 0 to 40oC (32 to 104oF); 80% RH
Storage conditions -10 to 460oC (14 to 140oF); <80% RH
Dimensions 200 x 92 x 50mm (7.8 x 3.6 x 1.9”)
Weight 700g (24.6oz)
IEC 1010 CAT III-1000V
Approvals
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Maintenance
Battery Replacement
When the low battery symbol appears on the LCD, the six 1.5V ‘AA’
batteries must be replaced.
1. Turn the meter off and remove the test leads
2. Unsnap the tilt stand from the rear of the meter
3. Remove the four Phillips head screws holding the battery cover
4. Remove the battery compartment cover
5. Replace the batteries observing polarity
6. Affix the rear cover and secure the screws.
7. Reattach the tilt stand
You, as the end user, are legally bound (EU Battery ordinance) to return all used
batteries, disposal in the household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your community or wherever batteries
/ accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Cleaning
Periodically wipe the case with a dry cloth. Do not use solvents or abrasives to clean this instrument.
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