Model 380353 V1.4 02/05
5
Operation
CAUTIONS
Observe all safety precautions when the FUNCTION switch is set to either the 100M
Ω
(500V) or the 400M
Ω
(1000V) position.
Connect the meter test leads to the circuit under test before operating the TEST switch.
Do not touch the clip ends of the test leads when the TEST switch is pressed.
Some electrical equipment, especially cables, may retain an electrical charge when
disconnected from the line. It is good practice to discharge such equipment with
grounding straps, or other suitable devices, before touching or making connections.
The meter automatically discharges the test circuits when the spring loaded TEST
switch is released.
IMPORTANT NOTE
Remove all power to the circuit under test when making resistance measurements. If
any voltage is present in the test circuit the red on the meter scale plate will light.
Immediately disconnect test leads and turn off power to test circuit.
Function switch
The FUNCTION switch is a five position rotary switch and is used to select the desired
range or function.
Test switch
The TEST switch is normally OFF. It is a spring loaded, momentary action for safety. The
test voltage generated by the meter is automatically discharged when the TEST switch is
released.
Connecting Test Leads
For all functions connect the red test lead to the LINE terminal and the black lead to the
EARTH terminal.
Test Lead Check
Set the rotary switch to the low resistance position (
Ω
). Connect the leads to the meter and
short the clip ends of the test leads and read the green resistance scale on the display.
Depress the TEST switch and the resistance should read between 0 and 0.5
Ω
. The
display should read maximum range with the leads open (not shorted). If any readings are
obtained 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.
Live Circuit Status LED
If the Live Circuit status LED is lit, voltage is present on the device under test. DO NOT
proceed to test with voltage present. Shock to the user and damage to the meter or device
under test can result if testing is done with voltage present. Proceed with testing only when
the voltage is removed from the device under test.
Power Test Status LED
When the meter is actively testing, the Power Test status LED will blink. When this status
LED is flashing DO NOT touch the test leads or any exposed parts in the testing area.
Hazardous voltages exist that can cause shock. If the Power Test LED fails to light, the
batteries must be replaced. Refer to the Maintenance section near the end of this manual.
Mechanical zero adjust
The pointer should indicate zero on the green 50
Ω
scale when the FUNCTION switch is in
the
Ω
position, when the test leads are shorted together, and when the TEST switch is
depressed. If the pointer does not indicate zero, adjust the white plastic mechanical zero
screw located on the lens cover.
