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
bare conductors
shock.
3.
Use caution when working near voltages above 60VDC or 30VACrm
4.
After insulation tests, capacitors
Test leads (including alligator clips) must be in good working order, clean and withou
5.
or cracked insulation.
When servicing, use only specified replacement pa
6.
Intern
ational Safety Symbols
Caution, refer to this manual before using this meter
Dangerous Voltages
and bus bars. Accidental contact with conductors
must be discharged.
rts.
could result in electrical
s.
working near
t broken
Meter is protected throughout by double or reinforced insulation
2
Model 380363-EU-EN-V-3.1-1/12
Meter Description
10
1. LCD
2. LOCK
3.
4.
5. TEST button
6. Rotary
7.
8.
9. ZERO
10. Input terminals
The tilt stand and
of the instrument
Display
but
ton
MEMORY contro
UP arrow key
itch
sw
DOWN arro
READ memory bu
w key
adjust butt
battery compartment are located at the rear
l button
tton
on
1
2
3
4
5
6
Operation
Connecting Test Leads
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.
9
8
7
For all measure
the COM input terminal.
Test Lead Check
1. Set the rotary switch to the Ω range.
2.
Touch the test lead tips together.
3.
Resistance should read less than 0.5Ω and the au
With the leads not touching, the display should read OL indicating over-rang
4.
Readings displayed other than the readings described above are evidence of a prob
5.
the test leads must be replaced be
to equipment an
the instrument fo
ments connect the red test lead to the VΩ input terminal and the black test lead to
dio tone should sound.
fore using the meter. Failure to do
d electrical shock. If replacing the test leads does not solve the problem, return
r repair.
3
e.
lem and
so could result in damage
Model 380363-EU-EN-V-3.1-1/12
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