25
Direct measurement of current
5.2.
5.2.1.
Connecting the multimeter
5.2.2.
Main measurement A in series in a circuit
The current is the flow of electrons through a conductor. To measure the current, you must open the circuit to
be checked and connect the inputs of the multimeter in series in the circuit.
Selection of the coupling from among:
-
alternating current measurement AC [F1]
-
direct current measurement DC [F2]
-
alternating current measurement superposed on a direct voltage AC+DC [F3],
at high impedance
When the device is in use in the 10A range, it can withstand an overload of 20% for one hour.
A overload of 20A is acceptable for 30 seconds max., with a pause of at least 5 minutes between measurements.
Reminder : Breaking capacity of the fuse = circuit 11A/1000V/>18kA
5.2.3.
Secondary measurements
1.
in I
AC
and I
AC+DC
:
-
the MATH function associated:
MATH
-
the frequency, period and MATH function :
FREQ_PER_MATH
-
the Pk+ then Pk- measurement and crest factor :
PK+_PK-_CF
-
the resistive power, its reference and MATH function :
W_REF_MATH
2.
in I
DC
:
-
the MATH function associated:
MATH
-
the resistive power, its reference and MATH function :
W_REF_MATH
5.2.4.
Waveform & trend
During an AC current measurement, the waveform of a signal at a frequency between 10 Hz and 600 Hz
can be viewed using the
function
As default, the GRAPH mode displays the trend curve of the quantity measured (default time base
1min28s) vs time.
Summary of Contents for Metrix MTX 3292B
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