What will happen if ordinary resistors replace precision resistors?

What will happen if ordinary resistors replace precision resistors?

What is precision resistance?

Precision resistors refer to resistors whose resistance errors, thermal stability of the resistors, and distribution parameters of the resistors all reach the standard.

What are the differences between precision resistors and ordinary resistors

The difference in material properties: within a certain temperature range, the error of precision resistors is much smaller than that of ordinary resistors.

The essential difference: the temperature stability of the materials used to make precision resistors is higher than that of ordinary resistors. For example, the error of ordinary resistance is 1%~5%, while the error of precision resistance is only 0.1% or less.

(Error explanation: For example, a resistance of 0.1% is a comprehensive error. In fact, it means that at room temperature (such as 10°C-35°C), within 1 year, including all errors, the resistance should still be guaranteed to be 0.1% Within.) Difference in cost: Because precision resistors use materials with higher temperature stability, the cost is much higher than that of ordinary resistors.

The difference in digital models: ordinary resistors are marked with 3 numbers, the first two are valid numbers, and the latter is a power, for example: 152 means 15*10 square = 1500 ohm precision resistors are marked with 4 numbers, the first three Is a valid number, the latter is a power, for example: 1502 means 150*10 square = 15000 ohms

The difference in the color ring reading: the color ring reading method for ordinary resistance and precision resistance is the same, except that only the first two digits of ordinary resistance are digits, and the first three digits of precision resistance are digits, the fourth ring multiplying factor, the fifth ring error , So the precision resistance is also called five-color ring resistance.

Application difference: Due to the higher cost, precision resistors are mainly used in high signal conversion, bridge circuits, sampling circuits, precision voltage dividers, etc., compared to ordinary resistors.

Generally speaking, the application of resistance in the circuit is generally current limiting and voltage dividing. The current limiting part does not need to consider the precision resistance. The voltage dividing part can be divided into two types.

1. The voltage has little effect on the subsequent circuit, here the voltage divider resistor is ordinary;

2. The voltage has a great influence on the subsequent circuit. Here, a high voltage divider resistance is used.

All in all, precision resistors can replace ordinary resistors, and ordinary resistors cannot replace precision resistors. If you use ordinary resistors to replace precision resistors, it will cause differences in the results of experiments or tests, which will cause inconvenience to yourself.