Chapter II
Digital Earth Tester
29
2. DESCRIPTION OF THE INSTRUMENT
2.1. General description
This portable, accumulator pack (or 9V-battery) powered, digital earth tester is fully-featured
to meet the needs of electricians and inspection authorities.
With this safe and easy-to-use instrument, you can carry out all the essential measurements
on an electrical installation: resistance measurements on earth and R Loop, insulation and
continuity, AC voltage, AC current, leak current and RCD differential circuit breaker.
2.1.1. Powering up, powering down and auto-shutoff
x Turn the switch to "I" and the instrument is ready to be used. Then choose the
required function using the selector switch, plug in the required leads, according to
the chosen function, and, if necessary, press the pushbutton (earth, insulation, RCD).
x To power down the instrument, unplug the leads and turn the switch to "O".
x The device shuts down automatically if the instrument is not used for 10 minutes. The
scrolling of the 5 indicators for the RCD ratings (number 16) provides warning of
imminent shutdown, enabling you to defer the shutdown by pressing the "TEST"
button.
x After automatic shutdown, the device is restarted by positioning the switch on "O" and
then on "I".
2.1.2. Selector switch
A 6-way rotary switch enables you to measure the following values:
x 20 : continuity (with buzzer)
x 20 : earth measurements
x 2,000 : earth measurements
x 200 M: insulation measurements at 500 V
DC
x 200 A
AC/2 AAC current measurements by clamp on 2 VAC input
x 600 V
AC voltage and differential circuit breaker opening measurements (RCD test).
2.1.3. "TEST" pushbutton
The pushbutton:
x activates insulation, earth measurements and RCD test. It powers the specific
circuit, providing protection between the terminals and the high voltage in the
instrument.
Keep the pushbutton pressed down until complete stabilization of the display.
Do not release the ³7(67´SXVKEXWWRQ The result is valid as long as
this button is pressed down.
x starts the RCD test (see paragraph 3.7, p. 41).
x postpones the automatic shutdown.
2.1.4. Voltage presence lamp
An indicator LED (number 7) is used to report the presence of external negative AC or DC
voltage on the M: terminals.
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