How to select a clamp meter
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Now, when buying a clamp meter, it’s necessary to decide on the appropriate specifications, such as the rated current and rated voltage of the clamp meter. When making a selection, how should I go about it? What data should I refer to? This is my first time dealing with these things. I checked some information just now; to ensure accuracy, the reading should be within the 1/3–2/3 range. Thank you all.
It depends on the circumstances under which you usually take the measurements.
What do you mean by the usual situation? Could you give an example? It’s my first time encountering this
For example, is it for high pressure or low pressure? Is it KV level, 380V level, or 24V level? What is the current level you usually measure?
KV level, for measuring high voltage, 10/110KV
For voltage and current measurements at 10/110 KV voltage levels, indirect measurement methods are generally used, as the voltage rating of instruments suitable for direct measurement is not greater than 1000 V. The measurement of high-voltage voltage and current requires the use of corresponding voltage and current transformers, along with voltage and current meters.
Regarding the method of indirect measurement, can a clamp meter be used? How should it be selected?
Indirect measurement uses an indicator gauge, which can display the readings without the need for a caliper gauge; if you insist on using a caliper gauge, you can tap into the wiring of the indicator gauge. Generally, the full-scale current meter for high-voltage testing is 5A at most; your meter can have a range of 0–20A. The value obtained from measurement is multiplied by the transformation ratio of the current transformer to give the actual current value.