Chapter II
Portable digital multimeter
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2. DESCRIPTION
This multimeter is one of the ASYC II (Advanced SafetY Concept, third generation) family,
designed for a high degree of user safety, maximum protection and a hitherto unrivalled
performance.
2.1. Selector
switch
It is a standalone, handheld professional measuring instrument, capable of measuring the
following quantities (accessed by the ten-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,
∗
dBm,
∗
temperature.
2.2. Keypad
An ten-key keypad lets you :
∗
select the autoranging mode (RANGE key)
∗
freeze a value (HOLD key)
∗
measure fast peaks (Pk +/- key)
∗
set the measurement relative to a reference value (REL key)
∗
select a function derived from the main function, or switch on the multimeter again after it
has been shut down automatically (SEL/ON key)
∗
select time-domain measurements: frequency, duty cycle, (Hz key)
∗
select survey mode to detect minimum, maximum or average value (SURV key)
∗
expand the bargraph scale (ZOOM key)
∗
activate sending data to a printer (PRINT key)
∗
activate back lighting of the display unit ( key)
2.3. Display
The display shows (display backlight when required in poor lighting conditions) :
∗
clearly legible figures (14 mm high)
∗
a readout of the parameter being measured through a 34-segment bargraph
∗
perform 50 000-count measurements (high resolution)
∗
perform 5 000-count measurements (low resolution)
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.
