How the color coding of resistors is recognized

Resistor - this is the most common element, embedded in any electronic circuit. It can be seen everywhere: from a simple washing machine to a modern computer. Two types of markings are used to indicate their properties: the first is the color marking of resistors by the method of applying multi-colored rings to the case, the second is alphanumeric.

Signed designation

On the case of resistors and capacitors of relatively large sizes, their nominal resistances (capacitances) are marked using abbreviated standard designations of units of quantities, and next - the probable deviation from the claimed value, for example: 1.5 Ohm 10%, 33 Ohm 20%. Such values encode the color marking of the resistors. Encryption of nominal values of small-sized products consists of a special set of alphanumeric characters. But at the same time, the mnemonic code, i.e. the colored rings, of which the color marking of the resistors consists, is universally applied. According to such a system, the unit of resistance Om is coded with the letter (E), 1000 Ohm - as (K), mega - already (M). The nominal capacitances of resistors from 100-910 Ohm are denoted in fractions of a kilo, and the range of 100,000-910000 is a mega-ohm. In the case of the expression of the nominal resistance by an integer, the alphabetic designator is placed after the numbers - ЗЗЕ (33 Ohm), 1М (1 МОhm). Recording a decimal fraction less than one puts alphabetic marks before the number, for example, M47 (470 kOhm). And in the case of a whole with a decimal fraction, the letter is written instead of a comma after: 1E5 (1.5 ohms), 1M5 (1.5 MOhm). The always present permissible deviation marks the trace of the resistance: 5%, 10%, 15%. Color marking of the resistor can combine both types of markings.

Color marking

It consists in marking the outer shell of the device with 3 or more colored concentric stripes. Each method of coloring has a certain numerical value, revealing the properties of the resistance of the resistor. Usually the last strip prescribes the value of the expected tolerance of the product, and the first strips speak of resistance. For example, for a 4-lane marking, the first two encode the size of the capacitance (Ohm), and the third serves as a multiplier for the value mentioned. The color marking of the resistors can be deciphered by placing the product so that the wide band and the subsequent rings behind it are closer to the left hand. Then you need to use comparative tables that help to clarify the significance of the differences.

Other standards

Color marking of imported resistors does not leave everything so unambiguously. The fact that for domestic products uses its own marking, but for foreign - another. Some manufacturers even change standards, creating their own color scheme. Unusual marking is used to distinguish those products that are manufactured according to the requirements of MIL, which differs from the markings of industrial and household purposes, can report on the properties of fire resistance, etc. For example, the firm "PHILIPS" indicates the value of the resistors as it is accepted everywhere, i.e. The first figures speak of the performance in ohms, and the last is the multiplier. Depending on the declared accuracy of the resistor, it is treated as 3-4 characters. Differences from the usual encoding lie in the semantic load of 7, 8 and 9 of the last digits.