Q:How to measure small resistance with magnetoelectric instrument?

It is widely used to measure various kinds of weak DC current. It can be used to measure DC voltage, measure AC voltage after rectifier device, etc.If used to measure the resistance, as long as is a magnetoelectric instrument connected to a DC power supply, when measuring resistance, resistance in series circuit to produce small current, magnetic pointer and deflection, if already on the table for calibration, it correctly display the measured resistance value, but to be measured the resistance is not easy too.

Q:What are the differences between the six bit digital multimeter, the two-wire method and the four wire method?

The two-wire mode: the two-wire system is at the two ends of the resistor with a lead wire, this way is simple, but the cost is low;The wire itself also has a resistance, and the resistance varies with the ambient temperature, which results in additional errors in the resistance measurement.

Q:What is usually used to measure the insulation resistance of electrical equipment?

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Q:Connection of swing meter of insulation resistance measuring instrument

What is the proper line reading for measuring the insulation value to the ground?Shake the end of the table, see the answer to question 1, shake the other end of the wire, the core of the wire to be measured, the shielding line suspended

Q:How does the 380V measure the voltage with a multimeter?

First, locate the gear of the three meter in less than 500V;

Q:How can you check the resistance with a multimeter?

The multimeter is placed in the proper resistance position, and the resistance is placed on the insulation separately. The resistance is measured at the two ends of the measuring rod to stabilize the contact resistance, such as in the indicating group value and the error range, then normal.

Q:Why not use the multimeter ohmmeter to measure the insulation resistance of electrical equipment?

Because the power supply voltage of the multimeter is low, the insulation resistance when the voltage is low can not reflect the real value of the high voltage, so it cannot be measured by ohmmeter or ohm gear.

Q:How to measure the thermal resistance.I have a thermistor here, I wonder if I can use it, and I don't know how to measure it

The resistance value of thermistor changes with the change of temperature, and the resistance coefficient of positive temperature coefficient thermistor (MZ) increases with the increase of temperature, and the negative temperature coefficient (MF) decreases with the increase of temperature

Q:What are the good methods and ingenious measuring methods for varistors to measure their good or bad?

First you must know the varistor voltage value, with an appropriate voltage source in series with a resistor voltage applied to the protection of the varistor varistor, voltage measurement value, whether in nominal value, if it is, that element is good. If the deviation from the nominal value is great, then there is a problem with this varistor.

Q:Operation procedure of transformer insulation resistance test?

The meter shall be selected according to the voltage level of the equipment, and the 2500 volt shaker shall be used for the 10KV-35KV transformer