Using The Features - Greenlee GT-540 Instruction Manual

Using the Features

• Low Impedance Auto V·
selects the proper measurement based on the input.
– If there is no input, "Auto" appears on the display.
– If voltage above approximately 2 volts AC or DC is present, voltage is
displayed.
– If both AC and DC voltages are present, the larger voltage is
displayed.
– If no voltage is present and there is resistance less than 6 M ,
resistance is displayed.
This mode features low input impedance to mask stray or "ghost"
voltage pickup. The input impedance is approximately 4 k at low
voltage, increasing to approximately 500 k at 1000 V.
• Intelligent Automatic Power Off (APO) To extend battery life, the tester
shuts itself off after approximately 3 minutes of inactivity. Inactivity
occurs when buttons are not pressed or the selector is not turned. The
tester will not enter APO when there are significant readings over 10%
of the range or non-OL readings for resistance and continuity. To restore
power, press any button or turn the selector to OFF and back on again.
• SELECT (GT-540 only) Press momentarily to toggle between functions.
• HOLD Press momentarily to hold the present value on the display.
Press again to exit this mode.
• EF Press momentarily to detect the electric field that surrounds current-
carrying conductors. Signal strength is displayed as a series of dashes
on the display.
– Use the tester's built-in antenna (located along the top, near the LCD)
for tracing live circuits or locating a break in a wire.
– For more precision, such as distinguishing between current-carrying
and ground wires, connect a test lead to the + input terminal and use
it as a probe.
• RANGE (GT-540 only) Press once to enter the manual ranging mode.
The icon will disappear from the display. Press repeatedly to
step through the ranges. Press and hold to return to the automatic
ranging mode.
8
Mode In this mode, the tester automatically