How to measure 220 voltage with three phase clamp meter?

There are two pen jacks, and you can measure the voltage by plugging in the watch pen.

Usually, when measuring current with an ordinary ammeter, it is necessary to cut off the circuit and shut down before the ammeter can be connected for measurement, which is very troublesome, and sometimes the normal operation of the motor does not allow this. In this case, a clamp ammeter is used.

It is much more convenient to measure the current without cutting off the circuit.

How it works:

The conductor of the circuit under test that passes through the core becomes the current transformer.

, in which a passing current is induced in a secondary coil. So that the ammeter connected to the secondary coil has an indication and measures the current of the line to be measured. Clamp table.

Different capacities can be changed by the toggle of the transfer switch. However, live operation is not allowed when dialing.

Clamp table general accuracy.

Not high, usually graded. For ease of use, there are also transfer switches of different ranges for measuring different levels of current and voltage.

Clamp meters are usually used to measure current, and only one wire can be clamped at a time for measurement, so there is no three-phase and single-phase.

If you want to measure the voltage of 220V with a clamp meter, it must be a multi-purpose clamp meter with a voltage measurement function, like a multimeter, and measure it with a meter pen when you hit the corresponding gear.

Whether it is the early pointer type or the commonly used digital clamp ammeter, it has the function of measuring AC voltage, as long as you dial the AC voltage gear, you can measure it with a meter pen. This kind of meter is called clamp ammeter or clamp meter for short, not called three-phase electric clamp meter, which is easy to cause misunderstanding. (For a three-phase three-wire load, the three phase wires are stuck at the same time, and the measured value is zero because the vector sum is zero).

Three-phase current needs to be detected by one phase and one phase, after all, there is a phenomenon of three-phase current imbalance.

Measurement method: 1. First of all, correctly select the voltage level of the clamp ammeter, check whether its appearance is well insulated, whether there is damage, whether the pointer swings flexibly, and whether the jaws are corroded. The rated current is estimated based on the power of the motor to select the range of the meter.

2. Before using the clamp ammeter, you should read the manual carefully to find out whether it is an AC or AC or DC clamp meter.

3. Due to the low accuracy of the clamp ammeter itself, the following methods can be used when measuring small currents: first wrap the wire of the tested circuit around a few times, and then put it into the jaws of the clamp meter for measurement. In this case, the current value indicated by the clamp meter is not the actual value being measured, and the actual current should be the reading of the clamp meter divided by the number of turns of the wire winding.

4. The jaws of the clamp meter should be closed tightly during measurement, if there is noise after closing, the jaws can be opened and re-completed once, if the noise can not be eliminated, the joint surface on the magnetic circuit should be checked whether it is smooth and clean, and it should be wiped clean when there is dust.

5. The clamp meter can only measure the current of one phase wire at a time, and the measured wire should be placed in the clamp window**, and the multi-phase wire cannot be clamped into the window for measurement.

6. The voltage of the tested circuit should not exceed the value indicated on the clamp meter, otherwise it is easy to cause grounding accidents or cause electric shock hazards.

7. Measure the working current of the cage asynchronous motor in operation. According to the size of the current, you can check and judge whether the motor is working normally, so as to ensure the safe operation of the motor and prolong the service life.

8. When measuring, you can measure once per phase, or once in three phases, at this time the number on the table should be zero, (because the three-phase current phasor sum is zero), when there are two phase wires in the jaws, the current value of the third phase is displayed on the table, and whether the motor has an overload phenomenon by measuring the current of each phase (the measured current exceeds the rated current value), whether there is a problem with the power supply voltage inside the motor or (the device that can convert other forms into electrical energy is called the power supply), that is, whether the three-phase current imbalance exceeds the limit of 10%.

9. Before measuring the clamp meter, the size of the measured current should be estimated first, and then decide which range to use. If it is not possible to estimate, you can use the maximum range first and then change it to a smaller one to get an accurate reading. It is not possible to use a small current to measure a large current. In case of damage to the meter.

The purpose of a clamp meter is to measure current, and a clamp meter with a simple function cannot measure voltage.

Only a clamp meter with an auxiliary function can measure the voltage, and its usage is no different from that of a regular multimeter.

The image below is a clamp table with auxiliary functions.

According to the above figure, insert the watch pen into the jack, and dial the gear to the "AC voltage gear" (this table is two AC gears, choose the more well-known gear), and you can measure the 380V voltage.

Voltage measurement requires a clamp meter to have a voltage measurement function, in fact, the voltage measurement does not have to use a clamp meter, ordinary multimeter can also be.

Specific method: Hit the clamp meter to the voltage level of the appropriate range. Insert the stylus and straddle the stylus between the phase lines. The line voltage can be measured.

In the first step, the phase voltage on the secondary side of the voltage transformer can be directly measured (the method is the same as above), and the phase voltage can be directly measured (the input end of the clamp meter. However, it is necessary to insert the meter pen and select the appropriate range, and its "bayonet" can only measure the AC current, a special clamp card meter. Make the pointer stay on the right, and use it in the same way as an ordinary multimeter, gradually from high to low in the case of unknown voltage level;

The second step is to measure the voltage in parallel through the meter pen, and the clamp meter to measure the voltage is through the clamp meter that comes with the multimeter to measure the voltage, and the transfer switch is modulated to the appropriate range.

First, the use of digital clamp tables.

1. Mechanical zeroing should be done before measuring.

2. Select the appropriate range, choose the large range first, then choose the small range or look at the nameplate value estimate.

3. When the minimum range measurement is used, and its reading is not obvious, the measured wire can be wound around a few turns, and the number of turns should be subject to the number of turns of the jaw**, then the reading = the indicated value of the range.

The number of full deviation turns.

4. After the measurement is completed, the transfer switch should be placed at the maximum range.

5. When measuring, the measured wire should be at the top of the jaw, and the jaw should be closed tightly to reduce the error.

Second, the precautions for digital clamp tables.

1. The voltage of the tested line should be lower than the rated voltage of the clamp meter.

2. When measuring the current of the high-voltage line, wear insulating gloves, wear insulated shoes, and stand on the insulating mat.

3. The jaws should be closed tightly and cannot be charged to change the range.