Chapter II
Portable digital multimeter
24
2. DESCRIPTION
This multimeter is one of the ASYC II (Advanced SafetY Concept, second generation) range,
designed for a high degree of user safety, maximum protection and unrivalled performance.
2.1. Selector
switch
It is a standalone, handheld professional measuring instrument, capable of measuring the
following quantities (accessed by the nine-position rotary selector switch) :
∗
AC voltages with AC (or RMS) capacitive coupling
∗
AC voltages with AC+DC (or TRMS) direct coupling
∗
DC voltages
∗
AC currents with AC (or RMS) capacitive coupling
∗
AC currents with AC+DC (or TRMS) direct coupling
∗
DC currents
∗
resistance values
∗
continuity (with beeper)
∗
capacitance
∗
diode threshold voltage
∗
frequencies
∗
duty cycles
∗
pulse counting
∗
pulse width
∗
dBm
∗
resistive power
2.2. Keypad
An ten-key keypad lets you :
∗
select the autoranging mode (RANGE)
∗
store a value (HOLD)
∗
measure fast peaks (Pk +/-)
∗
set the measurement relative to a reference value (REL)
∗
select a function derived from the main function, or switch on the multimeter again after it
has been shut down automatically (SEL/ON)
∗
select time-domain measurements: frequency, duty cycle, stopwatch, pulse counter (Hz)
∗
activate sending data to a printer (PRINT)
∗
activate back lighting of the display unit
∗
activate the MIN- MAX- AVG detection mode (SURV)
∗
expand the bargraph scale (ZOOM)
2.3. Display
The display shows :
∗
clearly legible figures (14 mm high)
∗
an analogue readout of the parameter being measured through a 34-segment bargraph
∗
perform 50 000-point measurements (high resolution)
∗
perform 5 000-point measurements (low resolution)
Display back light when required in poor lighting condiitons. Automatic switch-off.
2.4. Power
supply
It is powered by a standard 9 V battery which provides approximately 500 hours of operation.
2.5. Input
terminals
Measurements are performed using two measuring leads supplied with the instrument connected
to input terminals 1, 2, 3 and 4, as indicated in § 3.1.
