Tips for buying a watch with a clasp
1: Detection object
Choose the model based on different detection objects, such as AC current, DC current, or leakage current;
2: Detectable conductor specifications
There are different specifications ranging from 21mm diameter to 53mm diameter for testing purposes
3: Is it necessary to check the true efficacy value
The clamp ammeter using the average method cannot accurately detect non sinusoidal circuits such as motors and transformer circuits. To detect such circuits, a clamp ammeter using the true RMS method should be used
4: Other functions
A model that not only detects current, but also integrates detection function and recording output
The clamp current meter is abbreviated as a clamp meter. Its working part mainly consists of an electromagnetic ammeter and a through core current transformer. The iron core of a through type current transformer is made into a movable opening and forms a clamp shape, hence the name clamp ammeter. It is a portable instrument that can directly measure the AC current of a circuit without disconnecting the circuit. It is very convenient to use in electrical maintenance and has a wide range of applications.
What issues should be noted when using clamp watches?
(1) Before measurement, it is necessary to mechanically zero and inspect the appearance of the clamp gauge.
(2) Choose the appropriate range, first choose the large range, then choose the small range or estimate the nameplate value.
(3) When using the minimum range measurement and the reading is not yet clear, the measured wire can be wound a few turns. The number of turns should be based on the number of turns in the center of the clamp, and the reading=indicated value x range/full deviation x number of turns
(4) After the measurement is completed, place the conversion switch at the maximum range.
(5) When measuring, the measured wire should be placed in the center of the clamp and the clamp should be tightly closed to reduce errors.
black probe into the black wire interface, and the red probe into the yellow wire interface (to detect the 12V output voltage). After connecting all the connectors, the machine can be turned on for testing.
After booting up, we can observe that the data from the multimeter is constantly changing until the system is fully started before stabilizing. Record the voltage value at this time. Normally, it should be around 12V (approximately 11.95V to 12.15V, too low to ensure long-term stable operation of large loads, and without expansion potential. If it is too high, it will cause device heating and premature aging). Then press the rESET key to restart the machine. At this point, it is important to closely monitor the changes in the value of the multimeter. During the power on self-test, the multimeter value will reach a low point. Record the voltage value at this time. If the voltage difference between the highest and lowest values is not too large (within 0.3V), then this power supply is acceptable. If the pressure difference is too large, it indicates that the power supply has poor load capacity and should not be selected. I have personally encountered a 300W power supply, with a maximum value of 12.32V and a minimum value of only 11.73V, which frequently crashes during use.
Finally, observe the situation during use. Run various software and listen to music on the CD drive, allowing all components of the machine to operate. Pay attention to the voltage at this
