Tip 1: How to measure the capacitance of a capacitor with a multimeter

for measuring the capacitance of the capacitor is suitable almost any digital multimeter.Some of these devices allow to measure capacitance directly, others require resort to indirect methods of measurement.
Guide
1
To measure the capacitance multimeter having the appropriate function, connect it to the condenser, and then select the switch is the most accurate measure of the limits of capacity.If the display message overload occurs, switch the device on a tougher limit.Perform this switch as long as there will be no evidence.Read them.
2
If a bridge consoles for measuring capacity, use the meter as a device for determining the balance of the bridge.The relevant findings of the bridge, connect it through the detector with the filter capacitor, and the multimeter to select microammeter DC.Connect a capacitor to the bridge, balance a minimum of the last reading, then read the testimony of the scale of the bridge.
3
If the multimeter measurement function does not have the capacity an
d bridge consoles not, use the following method.Take a standard signal generator.Install it on a certain signal amplitude equal to a few volts.Including sequences multimeter operating mode microammeter milliamp or alternating current (depending on the measuring conditions), the test generator and condenser.Set a frequency to the meter showed a current of not more than in the first case, 200 mA, while the second - 2 mA (if the frequency is too low, it will not show anything).Then, divide the peak value of the voltage, expressed in volts per square root of two, to get the current value of it.The current move in amps, and then divide the voltage across the current, and you get the capacitance of the capacitor, expressed in ohms.Then, knowing the frequency and the capacitance, calculate the capacitance of formula:

C = 1 / (2πfR), where C - capacitance in farads, π - mathematical constant "pi», f - frequency in hertz, R - capacitive reactance in ohms.
4
Move calculated so that the capacity to more convenient units: PF, or microfarad nF.

Tip 2: How to measure the capacitance

The most common need for measuring capacitance arises from the owners of vehicles when checking battery availability.There are some simple steps to correctly measure their capacity .
How to measure the capacitance
Guide
1
battery is a galvanic cell in which an electric current is generated by chemical reactions in the battery.
2
Thus, the principle of the battery is not much different from ordinary batteries.Battery capacity - is the amount of electricity that can give a new or fully charged battery.
3
Battery capacity is measured in ampere-hours or milliampere-hours.Thus, if the capacitance battery is 2000ma hour (milliamp-hours), which means that the battery can supply a current 2000 mA for 1 hour or 200 mA for 10 hours.
4
To determine the capacity, the battery must first fully charge, then discharge given current track and time to fully discharge.Then you need to calculate the product of current and time for which the battery is discharged, and the obtained value will capacity th battery.
5
Likewise measured capacity batteries.The point of measurement capacity of the battery or batteries is that you can find the time during which the battery or the battery is fully discharged.After that, the battery will require recharging, and the battery will become completely unusable.
Sources:
  • what is measured battery
Note
not measure this way the capacity of electrolytic capacitors.

safe way discharges the capacitor before measuring.
Sources:
  • how to determine the capacitance of the capacitor

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