Ac Voltage Measurements (Frequency, Duty Cycle); Dc Current Measurements - Multimetrix DMM 240 Notice De Fonctionnement

Chapter II

3.2 AC voltage measurements (frequency, duty cycle)

measurements
Risk of Electrocution. The test probes may not be long enough
to reach the live parts in certain sockets contacts are too deeply
recessed. As a result, the reading may show 0 volts when the wall
socket is live. Make sure the test probes are touching the live parts
before assuming that no voltage is present.
Do not measure AC voltages if a motor on the circuit is being
switched ON or OFF. Voltage surges may occur that can
damage the multimeter.
1. Set the function switch to the VAC/Hz% position.
2. Insert the black test lead banana plug into the
negative COM terminal.
Insert red test lead banana plug into the positive
+ terminal.
3. Apply test probes to the points of the circuit to
be tested.
4. Voltage measured is displayed on screen.
5. Press the Hz% key to indicate "Hz".
6. Read the frequency in the display.
7. Press the MODE key again to display "%".
8. Duty cycle is displayed in percentage.

3.3 DC current measurements

Do not make 20 A current measurements for longer than 30 s.
Exceeding 30 seconds may cause damage to the multimeter
and/or the test leads.
1. Insert the black test lead banana plug into the
negative COM terminal.
2. For current measurements up to 6000µA DC,
set the function switch to the µA position and
insert the red test lead banana plug into the
µA/mA terminal.
3. For current measurements up to 600mA DC,
set the function switch to the mA position and
insert the red test lead banana plug into the
µA/mA terminal.
4. For current measurements up to 20A DC, set
the function switch to the 10A position and
insert the red test lead banana plug into the
10A terminal.
DMM240
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