16
KUSAM-MECO April 2011
®
TM
This innovative
AutoCheck
feature automatically
Hz
selects measurement function of
DCV, VFD-ACV
(with low pass filters) or
Resistance (
W
)
based on
the input via the test leads.
?
With no voltage signal but a resistance below
10M
W
(nominal) is present, the meter displays
the resistance value. When the resistance is
below the “Audible Threshold”, the meter further
gives a continuity beep tone.
?
With no input, the meter displays “Auto” when it
is ready.
?
When a signal above the voltage threshold
of 1V DCV or VFD-ACV up to the related 600V
is present, the meter displays the voltage value
in appropriate DCV or VFD - ACV, whichever
is larger in peak magnitude.
Note
:
When a measurement reading is being displayed
TM
in AutoCheck mode, press the RANGE or
SELECT button momentarily 1 time can lock the
range or function it was in. Press the button
momentarily repeatedly to step through the ranges
or functions.
*Range-Lock and Function-Lock Feature:
*As Hazardous- Alert:
When making resistance measurements in Auto-
TM
Check
mode, an unexpected display of voltage
readings alerts you that the object under test is
being energized.
17
KUSAM-MECO April 2011
®
*Ghost-Voltage Buster:
Gost-Voltages are unwanted stray signals coupled
from adjacent hard signals, which confuse
common multimeter voltage measurements. Our
TM
AutoCheck mode provides low (ramp-up) input
impedance (approx. 2.5K
W
at low voltage) to drain
ghost voltages leaving mainly hard signal values
on meter readings. It is an invaluable feature for
precise indication of hard signals, such as
distinguishing between hot and open wires
(to ground) in electrical installation applications.
WARNING:
TM
AutoCheck
mode input impedance increases
abruptly from initial 2.5k
W
to a few hundred K
W
's
on high voltage hard signals.
“LoZ”
displays on
the LCD to remind the users of being in such low
impedance mode. Peak initial load current, while
probing 600VAC for example, can be up to 340mA
(600V x 1.414 / 2.5k
W
), decreasing abruptly to
approx.3.4mA (600V x 1.414 / 250k
W
) with in a
TM
fraction of a second. Do not use Autocheck mode
on circuits that could be damaged by such low
input Impedance. Instead,use slide-switch selector
V or V high input impedance voltage modes to
minimize loading for such circuits.
