MULTITEST M72 - M73 - M74 - M75
EN - 7
4.1.1. Turning on
When the instrument is turned on, it emits a brief sound and all
display segments are lit for just one second. Then the model
number and the firmware release appear on the display (see
picture referred to M75). Finally the instrument is ready for
operation.
4.1.2. Auto Power Off
The instrument automatically turns off 10 minutes after last pressure of keys. To resume
operation turn on the instrument again. When the instrument must be used for long
periods, the operator may need to disable the Auto Power Off function. In order to do so:
keep pressed the FUNC HOLD key and turn on the instrument; this way the Auto Power
Off function is deactivated. On next switch on autopower off will be automatically restored.
On the instrument’s LCD the symbol is displayed only when auto power off is active.
4.1.3. Current measurement through external transducer
The instrument measures current through a clamp transducer to be connected to the input
terminals. Unlike traditional multimeters it’s therefore not necessary to interrupt the current
circuit to insert the measuring device. Besides it’s possible to use more clamps having
different full scales according to the current to be measured from time to time. To set the
full scale of the clamp being used, turn on the instrument by keeping pressed MODE
PEAK: the instrument displays the value of the set full scale. To modify such value press
the arrow keys to select the desided full scale, then press MODE PEAK to validate the
modification.
The instrument is supplied with full scale already pre-set for the provided clamp.
4.1.4. Phase sequence and phase conformity measurement
Additional functions (patented) distinguishing this instrument from other multimeters
available on the market are phase sequence and phase conformity measurements
(indispensable to interconnect two three-phase triads) with one test probe.
The instrument performs tests by simply touching the cable under test with the built in test
probe. Note! The instrument performs test by only touching the conductors under voltage
with the single test probe, therefore without having to connect both test probes. The
traditional 2-terminal measurement is however available.
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