How to measure the resistance of a household 220V socket

The resistance of the household 220V socket can be measured, and the resistance is normal to 0 because the conductive part of the socket is generally made of copper, and the length is short, so the resistance is very small, but there are many shoddy modern products, and there may be sockets with great resistance, so that it is easy to heat up when used, and even lead to fire, so it is necessary to measure.

The easiest way to measure, use a multimeter ohm 1 gear, so that even if the resistance is very small, it can be displayed, the measurement must remove the socket, connect the binding post behind the socket with a copper wire, and then measure from the front jack with a multimeter pen with two meters, the normal resistance should be zero, and the resistance is more than or close to 1 ohm is abnormal.

In fact, whether there is resistance can also be directly on the socket to use high-power electrical appliances to test, such as connecting a 1500w electric kettle, after using the socket does not heat, you can basically determine that it is very good, if the heat depends on whether it is the cause of the plug, change the plug and try again, still heated, you should detect its resistance, the resistance is too large do not use.

Your concept of this question is not clear, the socket is used to provide power, and if you want to measure, you can only measure the voltage.

Of course, theoretically the power supply has resistance, but you can't use the meter to measure directly, if you use the resistance meter to measure, the result will burn the meter, this kind of thing many beginners will do, to prevent.

Measure the resistance! Personally, I think it's more appropriate to use a megohmmeter! Do not measure resistance with electricity! The charge will break the coil and line of the megohmmeter or multimeter, and it will also endanger the personal safety of the operator!

Measure the resistance at different times when it is charged. You can wait for the power outage to measure, and besides, some loads are connected to it, and there is no way to measure it.

The resistance of the household 220V socket can be measured, and the resistance is normal to 0 because the conductive part of the socket is generally made of copper, and the length is short, so the resistance is very small, but there are many shoddy modern products, and there may be sockets with large resistance, so that it is easy to heat up when used.

It can even lead to fires, so measurements are necessary.

The easiest way to measure, using a multimeter.

Ohm 1 gear, so that even if the resistance is very small, it can be displayed, the measurement must remove the socket, connect the binding post behind the socket with a copper wire, and then measure from the front jack with two multimeter pens, the normal situation should be zero resistance, and it is not normal for the electric mega orange to sell resistance more than or close to 1 ohm.

In fact, whether there is resistance can also be directly on the socket with high-power teaser inspection, such as connecting a 1500w electric kettle, after using the socket does not heat, you can basically determine that it is very good, if the heat depends on whether it is the reason for plugging in the imitation head, change the plug and try again, still heat, you should detect its resistance, the resistance is too large, do not use.

1. Adjust the baseline to zero.

2. Use standard probes, do not add measurement accessories at will.

3. Use equipment with a high following frequency.

4. Do a good job of anti-interference measures.

Choose an oscilloscope with the right bandwidth (not a larger bandwidth, the better), choose the right voltage probe, and choose the right trigger settings.

The grounding resistance and insulation resistance should be measured with a special shake meter.

Ordinary resistance is measured with a multimeter resistance level.

Precision resistance, to be measured with a bridge.

The resistance of water is measured with a conductivity meter.

The resistance of the gas is not easy to measure, and the ionized gas can be used by voltammetry.

How to use a multimeter to measure resistance value:

1.Choose the right magnification stop.

The scale mark of the multimeter ohmic block is uneven, so the magnification block should be selected so that the pointer stays in the thinner part of the scale mark, and the closer the pointer is to the middle of the scale, the more accurate the reading. In general, the pointer should be pointed between 1 3 2 3 on the scale.

2.Ohmic zeroing. Before measuring the resistance, the two pens should be shorted and the "ohmic (electrical) zero knob" should be adjusted at the same time so that the pointer is just pointing to the zero position to the right of the ohmic tick mark.

If the pointer cannot be adjusted to the zero position, it means that the battery voltage is insufficient or there is a problem inside the meter. And every time you change the magnification gear, you have to zero the ohms again to ensure the accuracy of the measurement.

3.Reading: The reading of the meter head multiplied by the magnification is the resistance value of the measured resistance.

Method: Read step by step.

Multimeter method: Use the multimeter to directly connect the two ends of the resistance to be measured, select the appropriate resistance level, and read the value of the multimeter.

Bridge measurement method: The value of the resistance to be measured can be improved by using a resistance bridge to measure the value of the resistance to be measured. The resistance bridge is generally composed of a proportional resistance arm and a balanced bridge, and the output of the balanced bridge is zero by adjusting the resistance value of the proportional arm, and the resistance value of the proportional arm to be adjusted is the resistance value of the resistance to be measured.

Network analysis: In the field of RF, network analysis is an effective method to measure the parameters of components such as resistance, capacitance and inductance in a quiet disassembly circuit. This method determines the component parameters by measuring the s-parameters (i.e., scattering parameters) of the circuit, which can be used to measure complex circuits.

Current lapping comparison method: when using this method, there is a resistance (standard resistance) in the measuring circuit, its resistance value is known, by connecting the resistance to be measured and the standard resistance in series or parallel in the electric Qizhi jujube circuit, the current of the two is measured, because the current in the series circuit is equal, so the resistance value of the resistance to be measured can be obtained by comparing the current values of the two.

Resistance measurement methods include: direct method, comparative method, indirect method and multimeter measurement.

1. Direct method: The method of measuring resistance in ohms of a direct-reading instrument such as a multimeter is called the direct method.

2. Comparative method: The method of measuring resistance by comparing instruments such as DC bridges is called comparative method.

4. Use multimeter measurement: first select the measurement gear and range, then wither, then measure, and finally judge the quality or bad.

The classifications of resistance measurements are:

1. Direct measurement.

This is a method of measuring resistance using a specialized measuring instrument. In order to improve the accuracy of the measurement, the resistance can also be measured with a DC single-arm bridge, which is also a direct measurement. Some small resistors can be measured with a DC double-arm bridge to read the data directly.

Resistance values between 100 and 1000 can be measured directly with a micro-ohmmeter crack. The use of a megohmmeter can directly measure large resistances, but the error is large.

2. Indirect measurement.

When the measured quantity cannot be measured directly, the physical quantity with a certain functional relationship with the measured can be measured first, and then the size of the measured can be calculated according to the functional relationship, which is called indirect measurement.

For example, if we want to measure the resistance of the tungsten filament in an incandescent bulb, but the incandescent lamp is charged when it is operating, and the resistance of the tungsten filament in the bulb varies with temperature, we cannot directly measure the resistance value of the tungsten filament in the bulb with a multimeter. In this case, we can use a voltmeter and an ammeter to measure the physical quantities that have a certain functional relationship with the tungsten wire resistance in the bulb: voltage u and current i, and then calculate the tungsten wire resistance r in the bulb according to Ohm's law.