Table of Contents
How do you read a capacitor label?
If you have a capacitor that has nothing other than a three-digit number printed on it, the third digit represents the number of zeros to add to the end of the first two digits. The resulting number is the capacitance in pF. For example, 101 represents 100 pF: the digits 10 followed by one additional zero.
What do AC capacitor numbers mean?
The higher the voltage rating on your capacitor (or other electrical item) the faster the electrical current moves. The second rating is the microfarad (MFD) rating. A microfarad is a term to describe a capacitor’s level of capacity. That means the higher the microfarad rating, the more electrical current it can store.
What do the letters on a capacitor mean?
The letter represents the voltage rating according to the table below. The first two numbers represent the value in picofarads, while the third number is the number of zeroes to be added to the first two. For example, a 4.7 μF capacitor with a voltage rating of 25 volts would bear the marking E476.
What does the uF mean on a capacitor?
uF refers to the size of the capacitor. Capacitance is the charge that is necessary to raise the potential of a body one unit. A capacitance of 1 farad (f) requires 1 coulomb of electricity to raise its potential 1 volt (v). 1 micro farad (uF) = 0.0000001 F. Dannie Musser.
How do you decode a capacitor type?
How to Decode Capacitor Number Marking Step 1 – First Two Digits of Capacitor Number. The three digit code of the capacitor is 681J. Step 2 – Third Digit of Capacitor Number. The third digit says how many zeros we have to add in it to get the actual capacitance value. Step 3 – Fourth letter of Capacitor Number.
Can I use a 440v capacitor instead of a 250v?
Yes. You can always use a capacitor that has a higher voltage rating. However, you cannot use a higher or lower capacitance rating.
What does 25 70 21 Mean on a capacitor?
AMBIENT TEMPERATURE! CMRW, CMRW-S, UCW- -M and CDW lines are identified with 25/85/21, which indicates the minimum operating temperature of-25 ºC, maximum of 85 ºC and 21 severity days to humid heat. The CMLW and CDWV capacitors are identified with 25/70/21; therefore, the maximum temperature must not exceed 70 ºC.
What does 40 UF mean on a capacitor?
There is always a tolerance level on the microfarad (µF) rating. With this being said, that means that a 40 µF capacitor can rate from 37.6 to 42.4 µF and still be considered a passing capacitor. When engineers design motors, they take into consideration this type of tolerance range.
What wires go on AC capacitor?
HVAC Capacitor Wiring Color Codes & Connections – Basics Wire Color Typical Connections Blower Assembly / Fan Red Yellow From a fan motor controls the medium speed motor White Common wires connect to the grounded (neutral ) side of power source.
What should a capacitor read on a multimeter?
Use the multimeter and read the voltage on the capacitor leads. The voltage should read near 9 volts. The voltage will discharge rapidly to 0V because the capacitor is discharging through the multimeter. If the capacitor will not retain that voltage, it is defective and should be replaced.
What does 103 mean on a capacitor?
Capacitors will have a number on them like 103, 104, 224 . The last number represents the number of zeroes. All values are in picofarads. For example: 103 becomes 10 + 000 (3 zeroes) pF = 10000 pF = 10 nF.
What does 50 uF mean on a capacitor?
One farad is a very large value for normal household capacitors. Therefore, household capacitors are marked in μF or UF (microfarad). U is a replacement for μ. 50 UF means 50 microfarads. 0 (0).
What does 1000 uF mean?
The microfarad (symbolized µF) is a unit of capacitance, equivalent to 0.000001 (10 to the -6th power) farad. This unit is equal to . 000000000001 (10^-12) µF. In RF scenarios, capacitances range from about 1 pF to 1,000 pF in tuned circuits, and from about 0.001 µF to 0.1 µF for blocking and bypassing.
What does 10 uF mean on a capacitor?
The micro-Farad, nano-Farad or Pico-Farad ranges are where the Capacitors are used in electronics. A ten micro-FaradCapacitor is written as 10uF. A 100n Farad Capacitor is written as 100n. It could be marked as 0.1, meaning 100nF.
Can use higher uF capacitor?
An electric motor start capacitors can be replaced with a micro-farad or UF equal to or up to 20% higher UF than the original capacitor serving the motor.
How are capacitors letter coded?
Generally, the actual values of Capacitance, Voltage or Tolerance are marked onto the body of the capacitors in the form of alphanumeric characters. For example, a capacitor can be labelled as, n47 = 0.47nF, 4n7 = 4.7nF or 47n = 47nF and so on.
How do I identify a capacitor?
Ceramic types of capacitors generally have a 3-digit code printed onto their body to identify their capacitance value in pico-farads. Generally the first two digits indicate the capacitors value and the third digit indicates the number of zero’s to be added.
How do you read a 3 digit capacitor?
The three-digit capacitance code works as follows: If the third digit is 0 through 6, add that many zeroes to the end of the number. (For example, 453 → 45 x 10 3 → 45,000.) If the third digit is 8, multiply by 0.01. (e.g. 278 → 27 x 0.01 → 0.27) If the third digit is 9, multiply by 0.1. (e.g. 309 → 30 x 0.1 → 3.0).
