Principle of operation and use of the clamp-type ammeter
The important component of a clamp ammeter is the clamp core sensor, which opens and clamps the killed wire by pressing the trigger; It can pass through the clamp mouth without cutting. Passing through the iron core wire becomes the primary coil of the current transformer, where current is induced in the secondary coil through the current. Thus, the ammeter connected to the secondary coil will display the current of the tested circuit on the LCD. The ETCR series clamp ammeter automatically shifts gears and is easy to operate. Principle and operation of clamp ammeter
Usage of clamp ammeter:
1. Select the level requirements, range, and resolution of the clamp ammeter based on the condition of the tested circuit. Check if the clamp iron core is intact, if there is rust, and if the clamp opening and closing are sensitive
2. Before use, familiarize yourself with the instructions and operate according to the requirements
3. During on-site inspection, one single-phase line can be directly tested (line current measurement); Can clamp the main and neutral wires together (line leakage current); Three wire lines require single detection. By measuring
It can distinguish the absorption current, leakage current, and grounding current to determine whether the motor is overloaded
4. The voltage of the tested circuit should not exceed the value indicated on the clamp ammeter, otherwise it may cause grounding accidents or pose a risk of electric shock. The current of the tested circuit cannot exceed the limit of the ammeter. If the current value of the tested circuit is too high, a large range clamp meter needs to be replaced.
Tip for using a clamp ammeter: When testing low currents, first wrap the wires of the tested circuit a few times, and then clamp the test with a clamp ammeter. The obtained data is the reading of the clamp gauge divided by the number of turns the wire is wound. This way, the measured values are more accurate
