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FAQ

Current and power conversion of clamp type meter

Three-phase 380V circuit, maximum current *380*1.732* power factor = power

How can the air outlet of the air conditioner in the air conditioner flow out?

The pipe dew: because the insulation material on the pipeline is too poor or too thin, or not completely wrapped, when the refrigerant in the pipe through, causing condensation.

How to maintain and maintain the communication and power room?

1, multimeter. As one of the necessary testing tools in the daily maintenance, the multimeter is mainly used for testing voltage, current, frequency and other related parameters, requiring the resolution of at least 41/2 bits (10000 words). At present, the maintenance personnel is usually used by the American FLUKE company F80, F180 series of high precision digital multimeter, the multimeter resolution can reach 44/5 (50000 words), can fully meet the "Regulations" on the accuracy of the measurement requirements. At the same time, this kind of multimeter with anti dropping, anti burning, antimagnetic, anti sputtering, intelligent alarm and good maintenance, very suitable for field use.

How does three-phase motor check current?

The instrument features: the use of high resolution A/D intelligent processing technology, high precision, high performance, and the characteristics of multi function manual range and automatic range overload protection with automatic shutdown function has the function of reading is relatively keeping function test function with non-contact infrared temperature measurement function, anti slip surface plug alarm (sound and light FM747 only) with the RS232C standard interface real-time display of data changes in measurement process (FM757 only) anti dropping, anti burning, waterproof, antimagnetic, high precision, high range multi purpose

30mA leakage breaker trip home is always with what method to find the leakage point, with clamp ammeters how?

Check the leakage with shaking table or pointer multimeter 10K resistor file. In the case of power failure, the insulation resistance between the fire line and the ground wire of each branch is measured. When there is leakage, the meter will indicate a relatively small resistance value and the insulation will indicate infinity.

With the operation of the motor current clamp meter measuring three-phase, single-phase current is very low, what is the reason?

Is there a problem with the removal of the caliper?. If you have checked, no problem, you can determine the correct data, low current, or motor without load or light load, or the power of the motor itself is small.

A multimeter what brand is good

This kind of table has simple structure, shock resistance, multifunction and cheap price. In choosing, mainly consider the sensitivity and range. Brand words like Fluke, VICTOR's victory, UNI-T, Xin Ling CLIN, Huayi MASTECH, HIOKI - these are good, are on the list of top ten brands of China network to buy the ten brands list, is a recognized brand, you can choose from.

Electric drills, electric saws and so on. Under what circumstances should carbon brushes be used?

If the power tools are stationary or not turned, they should be changed basically, unless the motor is burned;