AEMC 603, Руководство пользователя

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3.10 STARTING CURRENT OR OVERCURRENT (True InRush
®
)
MEASUREMENT
To measure a starting current or overcurrent, proceed as follows:
1. Set the switch to , correct the DC zero (see §3.9.2), then clamp the
jaws around the conductor to be measured.
2. Perform a long press on the button. The
InRh
symbol is
displayed, along with the triggering threshold. The clamp then awaits
detection of the True InRush
®
current. "------" is displayed and the A
symbol flashes.
3. After detection and acquisition for 100 ms, the RMS value of the True
InRush
®
current is displayed. Pressing the button will display the
PEAK+/PEAK- values subsequently.
4. A long press on the button or a change of function on the rotary
switch will exit the True InRush
®
mode.
NOTE:
The triggering threshold in A is 20A if the initial current is zero (starting of
installation). For an established current (overload in an installation) see §3.4.3.
3.11 FREQUENCY MEASUREMENT (HZ)
The frequency measurement is available in V and A for AC measurements. The
measurement is based on a count of zero crossings (positive-going edges).
3.11.1 Frequency Measurement (V)
To measure the frequency in voltage, proceed as follows:
1. Set the switch to and press the button. The
Hz
symbol is displayed.
2. Select AC by pressing the (yellow) button until the desired choice
is reached.
3. Connect the black lead to the
COM
terminal and the red lead to the "
+
"
terminal.
4. Connect the test probes or the alligator clips to the circuit to be
measured.
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