Extech 380320 Operating Manual
User's Guide
Analog High Voltage
Megohmmeter
Model 380320
Introduction
Congratulations on your purchase of the Extech 380320 Analog High Voltage
Megohmmeter. The 380320 features three Insulation test ranges with a live circuit
indicator, as well as low resistance and AC voltage measurements. The Power Lock On
feature allows hands-free operation. This professional meter is shipped fully tested and
calibrated and, with proper use, will provide years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer
to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous
voltages may be present
Safety Notes
Warnings
Cautions
Double insulation
• Do not exceed the maximum allowable input range of any function.
• Set the function switch OFF when the meter is not in use.
• Remove the battery if meter is to be stored for longer than 60 days.
• Circuits under test must be de-energized and isolated before connections are made
(except for voltage measurements).
• Circuit connections must not be touched during a test. Use extreme caution when
working near bare conductors and bus bars. Accidental contact with conductor could
result in electrical shock.
• After insulation tests, capacitors must be discharged.
• Set function switch to the appropriate position before measuring.
• When changing ranges always disconnect the test leads from the circuit under test.
• Improper use of this meter can cause damage, shock, injury or death. Read and
understand this user manual before operating the meter.
• Always remove the test leads before replacing the battery.
• Inspect the condition of the test leads and the meter itself for any damage before
operating the meter. Repair or replace any damage before use.
• Use great care when making measurements if the voltages are greater than 25VAC
rms or 35VDC. These voltages are considered a shock hazard.
• Voltage checks on electrical outlets can be difficult and misleading because of the
uncertainty of connection to the recessed electrical contacts. Other means should be
used to ensure that the terminals are not "live".
• If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
2
380320 V1.0 06/09
Meter Description
1. Analog display – See Display Description
below
2. Batt Check key – Checks battery level (with
TEST key)
3. 0 ADJ key – Adjusts Zero point for Analog
display
4. Backlight key – Turns on Backlight
5. TEST/LOCK key – Enables Battery Check,
Resistance, and Megohmmeter functions
(can be locked by rotating clockwise)
6. Function Selector knob – Selects desired
range and function
Top View
1. VΩ Test Lead Input
2. COM Test Lead Input
Display Description
1
2
3
1
4
5
6
2
1. Red: Megohmmeter Scale: Multiply reading by 0.5 (for 250V range), 1 (500V), 2
(1000V)
2. Green: Low Resistance Scale (0 to
3Ω)
3. Green: Resistance Scale (0 to 500Ω)
4. Blue: AC Voltage Measurement Scale
(0 to 600V)
5. BATT GOOD indicator
6. LIVE CIRCUIT Indicator LED
3
380320 V1.0 06/09
1
2
3
4
5
6
Loading...