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The E series is a system of preferred numbers (also called preferred values) derived for use in electronic components. It consists of the E3, E6, E12, E24, E48, E96 and E192 series, [1] where the number after the 'E' designates the quantity of logarithmic value "steps" per decade.
The standard resistor values are organized into a set of series of values known as E-series. The different values within each series are separated such that the top of the tolerance band of one value and the bottom of the tolerance band of the next one do not overlap.
The 120 ohm resistor has a value ranging between 110 and 130 ohms. Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270, 330 and so on (rounded appropriately); this is the E12 series shown in the table below.
Vishay. Standard Series Values in a Decade for Resistances and Capacitances. Revision: 22-Aug-12. 1. Document Number: 28372 For technical questions, contact: aluminumcaps@vishay.com. THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE.
21 lis 2016 · E most likely stands for an E series resistor e.g. E24 - preferred value resistor see resistorguide.com/resistor-values \$\endgroup\$ –
Standard Resistor Values. In 1952, the IEC (International Electrotechnical Commission) decided to define the resistance and tolerance values into a norm, to ease the mass manufacturing of resistors. These are referred to as "preferred values" or "E-series", and they are published in standard IEC 60063:1963.
To understand the system of standard resistor values, the mathematical basis behind these “E-series” sets of preferred values comes from the square root value of the actual series being used. For example, let’s look in detail at the ±20%, E6 series of colour coded fixed value resistors.
