Tolerance
is the permissible relative deviation of the capacitance
from the rated value, expressed in per cent. The
tolerance is to be measured at a temperature of +20°C
and is only valid at the time of delivery.
After a longer period of storage or use, the tolerance
can increase; but, according to standard specification,
it may never exceed twice the value measured at the time
of delivery.
The
following delivery tolerances are usual for wound
capacitors:
±1%; ±2.5%; ±5%; ±10%; ±20%.
In the case of
electrolytic capacitors for which the largest possible
capacitance matters, tolerances of +100/-20% also occur.
Note: The
tolerance (with the exception of 20%) is usually clearly
marked on the body of the capacitor, in case of very
small capacitor sizes, coding or ciphers according to IEC
60062 are also used. |
