Although the bridge method of the direct current bridge has a high accuracy in measuring resistance, there are still some common errors, mainly including the following aspects:

1. 1.

   Precisión de los resistores：

• The accuracy of known resistors directly affects the accuracy of the measurement results. If the value of the known resistor is inaccurate, the measurement results will also be affected. Therefore, choosing high-precision resistors is key to reducing errors.1.

2. 2.

   Temperature effects：

• The resistance value of a resistor can change with temperature. During measurement, if the ambient temperature changes or the resistor itself generates heat, it can lead to changes in the resistance value, affecting the measurement results. To reduce the impact of temperature on the measurement results, temperature compensated resistors can be used or measurements can be performed in a constant temperature environment.1.

3. 3.

   Effect of contact resistance：

• The resistance of the wires and contact points also affects the measurement results. These resistances are usually small, but they can have a significant impact in high-precision measurements. To reduce the influence of contact resistance, high-quality wires and contact points should be used, and the contact points should be kept clean and firmly connected.1.

4. 4.

   Stability of power supply voltage：

• The stability of the power supply voltage has an important impact on the accuracy of the measurement results. If the power supply voltage fluctuates significantly, it can lead to inaccurate measurement results. To improve the accuracy of the measurement, a stable power supply can be used, and the measurement should be performed when the power supply voltage is stable.1.

5. 5.

   Accuracy of measuring instruments：

• The accuracy of the measuring instruments used (such as voltmeters, ammeters) can also affect the measurement results. If the measuring instruments are not very accurate, the error in the measurement results will also increase accordingly. To improve the accuracy of the measurement, high-precision measuring instruments can be used and regularly calibrated.1.

6. 6.

   Accuracy of bridge balance：

• The balanced state of the bridge is crucial for the measurement results. If the bridge is not completely balanced, the measurement results will be inaccurate. To ensure the balance of the bridge, a high-precision balance adjustment device can be used, and the balance state of the bridge can be carefully adjusted.1.

7. 7.

   Environmental factors：

• Environmental factors (such as humidity, atmospheric pressure, electromagnetic interference, etc.) can also affect the accuracy of the bridge method for measuring resistance. To reduce the influence of environmental factors, measurements can be made in a controlled environment and shielding measures can be taken to reduce electromagnetic interference.1.

Changzhou Tesco Electronics Co., Ltd.OperatingFull range of DC resistance testers,Insulation resistance testers,Multichannel temperature data acquisition instruments.