Use a multimeter to measure the condition of a heating tube

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Multimeters are divided into analog multimeters and digital multimeters. The following are the methods for using these two types of multimeters to measure the condition of a heating tube:
# Analog Multimeter
1. **Preparation for Resistance Measurement**
- Set the multimeter to the resistance range. Generally, select the R×10Ω or R×1Ω range. If the heating tube has a relatively large power and a small resistance, you can choose the R×1Ω range; if the resistance is relatively large, you can choose the R×10Ω range.
- Perform ohmic zero adjustment. Short-circuit the red and black test leads and adjust the zero adjustment knob to make the pointer point to the zero position on the resistance scale.
2. **Resistance Measurement**
- Touch the red and black test leads of the multimeter to the two terminals of the heating tube respectively, and read the resistance value indicated by the pointer of the multimeter.
- If the pointer does not move, it indicates that there may be an open circuit inside the heating tube; if the resistance value indicated by the pointer is zero or close to zero, there may be a short-circuit situation.
- For a normal heating tube, according to its power and rated voltage, the resistance value can be estimated by the formula \(R = \frac{U^{2}}{P}\). For example, for a heating tube with a voltage of 220V and a power of 1000W, its resistance is approximately \(R=\frac{220^{2}}{1000}=48.4\Omega\). If the actual measured value does not differ much from the estimated value, it is basically normal.
3. **Insulation Performance Inspection**
- Touch one test lead of the multimeter to the terminal of the heating tube, and the other test lead to the metal shell of the heating tube.
- Under normal circumstances, the resistance value should be close to infinity. If the resistance value is small, it indicates that the insulation performance of the heating tube is poor, and there may be a risk of electric leakage.
# Digital Multimeter
1. **Setting for Resistance Measurement**
- Press the power switch of the multimeter and turn the function knob to the resistance measurement range, usually indicated by the symbol "Ω". According to the approximate resistance value of the heating tube, select an appropriate range. If you are not sure, you can first select a larger range, such as the 2000Ω range.
2. **Resistance Measurement**
- Connect the red and black test leads of the multimeter to the two terminals of the heating tube respectively, and observe the resistance value displayed on the display screen of the multimeter.
- If "OL" or "∞" is displayed, it indicates that the heating tube may be open-circuited; if the displayed value is 0 or an extremely small value, the heating tube may be short-circuited.
- Compare with the theoretically calculated value to determine whether the heating tube is within the normal resistance range.
3. **Insulation Detection**
- Connect the red test lead to the terminal post of the heating tube, and the black test lead to the shell of the heating tube.
- Check the resistance value displayed on the multimeter. Normally, a very large value should be displayed. If the displayed value is small, it indicates that there is a problem with the insulation.

Before measuring the heating tube, make sure that the heating tube has been powered off and cooled down to avoid electric shock and scalding. At the same time, the measurement results can only be used as a preliminary judgment. If you still have doubts about the condition of the heating tube, it is recommended to conduct further inspection or replace the heating tube. #tiktokrefugee#cat#tiktokban#china#抖音难民#EfficientWinding#PowerTransformers #TransformerManufacturing #ElectricalComponents #EngineeringExplained #transformador #eléctrico #tecnología #fábrica #foryou #viral #videocorto #manufactura #máquina #energía #shorts #tendencias #cableado #trabajofábrica #ingenieríaeléctrica #transformadordeenergía #transformadoreléctrico #fabricación #proceso #fabricante #procesodefabricación #EnvolturaAltaTensión #EEUU #Canadá #Australia #ReinoUnido #vlogdiario #diario #trabajoadistinta #Tesla #TrabajoDiario #cableeléctrico #ingenieríadeenergía #transformador #envolturaenfoil #naciónbajavoltage #ingenieríaeléctrica #EnvolturaBajavoltage #EnvolturaFoil #IngenieríaEléctrica