Datasheet

DCM305E
Earth Leakage Clampmeter
DCM305E
Earth Leakage Clampmeter
■ 0.001 mA resolution
■ Up to 100 A AC
■ TRMS reading
■ Low pass filter to aid stability of readings
■ Auto, data & peak hold
■ 40 mm jaw
DESCRIPTION
The DCM305E is designed to check earth leakage currents; however
the upper range enables TRMS AC current measurements of up to
100 A. TRMS meters can measure both pure, undistorted, sinusoidal
AC waveforms and non-sinusoidal AC waveforms which can contain
pulse trains, triangles, spikes and other ragged waves.
The instrument has six ranges: 6 mA, 60 mA, 600 mA, 6 A, 60 A,
100 A with a minimum resolution of 0.001 mA on the 6 mA range.
Either auto or manual ranging can be selected.
Harmonics / electrical noise on the cables / circuit under test can give
rise to incorrect readings so the DCM305E features a low pass filter
(50/60 Hz) which vastly improves measurements on these particular
circuits.
A compare function is also featured which has 3 pre-set leakage limits
(0.25, 0.50, 3.5 mA) which when selected offers a visual indication
and audible warning when the pre-set limit is exceeded.
For those hard to read measurements, where accessibility is a
problem, auto hold and data hold features have been incorporated
to aid measurements. A peak hold option is also featured on this
instrument.
An auto-backlight also aids easy viewing of the 6000 count display.
The 40 mm jaw has been designed to allow measurements on both
insulated and non-insulated conductors.
Safety has been enhanced with inclusion of a tactile hand barrier /
hand guard in the instrument case design.
To save battery life an automatic power off feature will switch the
clamp off if no readings have been made during a 20 minute period.
The instrument is pocket sized, light weight, rugged and easy to use,
making it an ideal choice for the electrical industry.
APPLICATIONS
A typical application for the DCM305E would be a measurement of
earth leakage current in a circuit where the RCD keeps tripping out
unexpectedly.
The measured result will quickly identify whether the earth leakage
current present is excessive causing the RCD to trip or if the RCD
itself is very sensitive / faulty. Earth leakage can be the result various
undetected faults in the installation or a faulty appliance.
Cable insulation deterioration, cable damage or the ingress of
moisture into areas where exposed terminals are present may give
rise to earth leakage current.
FEATURES
n 0.001 mA resolution
n 100 A range for standard AC current measurements
n Compare feature
n Low pass filter
n Analogue bargraph display for trending