How to measure voltage with a clamp-on ammeter
A clamp meter is an instrument used to measure the amount of current in an electrical line that is in operation, and can be used to measure current without disconnecting the power. Clamp meter is actually a current transformer, stuck wire is equivalent to the primary coil of the transformer, when there is current in the wire, it will produce magnetic flux in the core of the table, and then in the table is the secondary coil induced current, this current is equal to the current in the primary coil multiplied by the number of turns of the primary coil (which is a piece of wire, so it is a turn) divided by the number of turns of the secondary coil, and then according to the relationship, it can be convert the current in the wire.
Clamp ammeter is actually an electromagnetic inductor, the root of the energised wire to produce a magnetic field, the size of the current produced by the magnetic field strength is not the same, and then in the clamp meter converted current values, due to the three-phase voltage differences exist, so the current hole on each phase is different, so you can only measure the current of a single-phase, finished and then calculate the average current. Finally, whether it is three-phase 380v voltage or two-phase 220v voltage, the use of the same method.
Clamp multimeter clamp ring is set up for measuring current, but clamp multimeter since the name, not only measuring AC current a function.
Many clamp meter with resistance, AC and DC voltage and other functions, in short, ordinary multimeter on the function can be done on the clamp multimeter up. Many clamp meters with the function of measuring DC current, but most of them use the pen, not the clamp ring.
Set to current, directly with the caliper clamp to measure the current of the wire can be.
Some clamp meters can measure voltage, some can not measure voltage. Can measure the voltage, are equipped with a pen, insert the pen into the corresponding hole, adjust to the voltage gear, with two pens were put to measure the voltage point can be, such as a fire wire, a zero line.
