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triangle, pulse trains, spikes, as well as distorted waveforms with
the presence of harmonics. Harmonics may cause :
1) Overheated transformers, generators and motors to burn out
faster than normal
2) Circuit breakers to trip prematurely
3) Fuses to blow
4) Neutrals to overheat due to the triplen harmonics present on
the neutral
5) Bus bars and electrical panels to vibrate
Crest Factor
Crest Factor is the ratio of the Crest (instantaneous peak) value
to the True RMS value, and is commonly used to define the
dynamic range of a True RMS DMM. A pure sinusoidal waveform
has a Crest Factor of 1.414. A badly distorted sinusoidal
waveform normally has a much higher Crest Factor.
4) OPERATION
CAUTION
Before and after hazardous voltage measurements, test the
voltage function on a known source such as line voltage to
determine proper meter functioning.
AutoV (LoZ) mode
AutoV
automatically selects measurement function of DCV or
ACV, based on their input levels via the test leads. The input also
provides a low ramp-up impedance (LoZ) to drain ghost voltages*.
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●
With no input, the meter displays “- - - -” when it is ready.
●
When a signal above the voltage threshold of 1V DC or
AC up to the rated 1000V is present, the meter displays the
voltage value in appropriate DC or AC, whichever larger in
peak magnitude.
*Ghost-voltage Buster:
Ghost-voltages are unwanted stray signals
coupled from adjacent hard signals, which confuse common
multimeter voltage measurements. The
AutoV
mode provides low
(ramp-up) input impedance (approx. 2.1kΩ 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
g r o u n d ) i n e l e c t r i c a l i n s t a l l a t i o n a p p l i c a t i o n s .
*Only
HOLD, EF & Backlight
push-button features are available
in AutoV mode.
Note :
