Principle of operation of an AC/DC clamp-on ammeter
Ø Generally Hall sensors are used to test DC currents. Because AC clamp meter cannot be used for electromagnetic induction method. The Hall sensor is placed as shown in the figure below. The magnetic flux generated is proportional to the main DC and AC currents in the clamp head this is the Hall sensor detects the magnetic flux and dissipates it as an output voltage.
Hall Sensor:It is a semiconductor that generates a proportional voltage to the bias current generated by the DUT and generates an output terminal magnetic field when the bias current is applied to the input terminal.
How does a clamp-on ammeter operate?
Ø Normally an AC clamp-on ammeter operates on the CT principle, which is often used to obtain magnetic flux from a current through a conductor. Assuming that the current through the conductor is the main current, we can obtain a current proportional to the main current by electromagnetic induction through the secondary coil of the clamp head (which is connected to the circuit of the object to be measured). This enables us to get a reading of the AC current (when using a digital clamp-on ammeter)
Refer to the flow chart below for details:
Comparison function:
ØSelect and set the standard insulation value in each measurement range and make a comparison with the reading.
Ø Obtain the result by comparing the fail or pass signal displayed on the screen and noting the beeping sound.
Ø Beep alerts can be associated with fail or pass according to the user's requirements.
