Ukuran dua aspek menggunakan a multimeter's ohm range:

Common electric heating tubes include finned electric heating tubes, finned electric heating tubes, finned electric heating tubes, PTFE electric heating tubes, quartz electric heating tubes, etc. They are inexpensive, easy to use, easy to install, pollution-free, and widely used in various heating situations.

1. Paip badan is bocor elektrik

2. There is no obvious damage to the tube body. The resistance value of the heating tube measured with a multimeter is 0, indicating that it is definitely broken

3. There are obvious holes, sand holes, and cracking on the surface of the pipe.

Ukuran dua aspek menggunakan a multimeter's ohm range:

1. The resistance of the two outgoing lines should be normal. For 220V, 1000W is about 48 ohms, 1500W is about 32 ohms, and so on.

2. Penebat rintangan antara any outgoing line and the casing should be several megaohms or more. Those who can pass the above two measurements are good.

A multimeter is a relatif precise instrument, and improper use can result in inaccurate measurements and extreme damage. However, as long as we master the usage methods and precautions of a multimeter, and act with caution, then a multimeter can be durable and long-lasting. When using a multimeter, the following precautions should be taken:

1. The measurement of current and voltage should not be rotated to the wrong gear. If the resistance or current range is mistakenly used to measure voltage, it is extremely easy to burn out the meter. When the multimeter is not in use, it is best to rotate the gear to the highest AC voltage to avoid damage due to improper use.

2. When measuring DC voltage and current, pay attention to the polarity of "+" and "-" and do not connect them incorrectly. If the pointer is found to be turned on or off, the meter rod should be replaced immediately to avoid damaging the pointer and meter head.

3. If the magnitude of the measured voltage or current is unknown, the highest gear should be used first, and then the appropriate gear should be selected for testing to avoid excessive deviation of the meter needle and damage to the meter head. The closer the selected gear is to the measured value, the more accurate the measured value will be.

4. When measuring resistance, do not touch the bare ends of the component (or the metal parts of the two gauge rods) with your hands to avoid parallel connection between the human resistance and the measured resistance, which may result in inaccurate measurement results.

5. When measuring resistance, if two meter rods are short circuited and the "zero ohm" knob is adjusted to the maximum, the pointer still cannot reach the zero point. This phenomenon is usually caused by insufficient battery voltage in the meter, and a new battery should be replaced to accurately measure.