How are the various quantities measured?
100,000 cts digital multimeters 31
How are the various quantities measured? (continued)
2. Direct measurement
of current
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] or
- direct current measurement DC [F2] or
- alternating current measurement superposed on a direct voltage AC+DC [F3],
at high impedance.
Direct measurement
of a current,
key:
1. Press function A, then select the coupling according to your measurements:
AC, DC, AC+DC (AC+DC is default)
2. Connect the black lead to the COM terminal, the red lead to A, and the probe
tips in series between the source and the load as shown below:
3. Read the measurement indicated on the main display unit.
4. Look up the graph of the trend values >88s if it is activated.
5. Look up the secondary measurements if they are activated (activated by
Meas… MEAS+).
6. It is possible to display the specifications of the range for metrology or a
RELative measurement.
7. Surveillance of voltage SURV or Recording MEM of data internal to the
multimeter "OL" is displayed if the current available I >20A.
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
How are the secondary
quantities obtained
in current measurement
A? By pressing
Meas… MEAS+
Selecting the line
(shaded, opposite)
1. in IAC and IAC+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 IDC :
- the MATH function associated: .......................................................... MATH
- the resistive power, its reference and MATH function : ...................... W_REF_MATH
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