When using industrial electric heating equipment, it is often found that the equipment is not working properly or not working in the heating equipment. The existing problems need to be investigated one by one, but for the heating equipment, we need to check the heating tube if it is not heated. Usually used The testing equipment is a multimeter. If you use a multimeter to detect damage to the heating tube, replace it directly, which can reduce the troubleshooting and make the equipment work as quickly as possible. But it is worth discussing how to use the multimeter correctly.
Calculate the resistance value of the heating tube according to the parameters, and then measure it with the appropriate resistance file of the multimeter according to the resistance value. In fact, the resistance generally has a cold state and a hot state, and the multiple of the difference is 10 times larger depending on the material. Therefore, the test is not a constant standard, as long as it is not 0 (short-circuit the test leads first, look at the displayed data, and measure the resistance value of the heating tube after subtracting the data when the short-circuit is connected), or the resistance value is greater than 100 ohms. It shows that the heating tube is good, otherwise there will be problems.
Of course, you can use a multimeter to measure AC and DC (multimeters are divided into digital multimeters and pointer multimeters):
Digital multimeter to measure AC voltage: connect the black test lead to the ground (marked in the socket of the test lead), and connect the red pen to the AC (or V letter plus one) hole; the gear refers to 750 in the AC~ column (some is 1000) ( If it is to measure the mains 220V) range. Then the two pens touch the two holes of the power socket respectively, and the reading is the AC voltage value.
Digital multimeter to measure DC voltage: measure AC at the same time, only the red pen is connected to + hole, the red pen is also in contact with the power supply + pole, the gear is in DC (or there is a short horizontal line under the V letter) gear, the range depends on the specific situation, from Big to small. For example, when testing a AA battery, select the 2V range. If the polarity is reversed, there will be a negative display before the reading.
Pointer meter to measure AC voltage: connect the black pen to negative or ground, the red pen to +, the gear is set to AC~500V, insert two pens into the digital multimeter, and the number pointed to by the pointer should be read corresponding to the maximum range on the right: optional If it is 500V, the reading should look at the row with the largest number marked 50 on the right side of the reading plate. If the pointer points to 20, then the reading is 200V.
Pointer multimeter to measure DC voltage: same as digital multimeter measurement method, the reading is the same as the above measurement of AC voltage; when the positive and negative poles of the DC voltage cannot be determined, it can be measured as AC first, but the reading is not concerned, but the test leads are reversed. In the performance test, see which of the two measurements the pointer needs to deflect, then the positive and negative polarity that the test pen touched this time is the correct positive and negative polarity. Then set the gear to the appropriate range of the DC voltage and take the reading again.
The difference between AC voltage and DC voltage
AC voltage is a voltage whose direction and size change periodically; DC voltage is a voltage whose direction and size remain constant.
Notice:
1. The AC voltage changes periodically rather than randomly;
2. Direct current is based on voltage rather than current.
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