Frequency Variation - A change in frequency of more than 3 Hz.
COS phi - A measure of the phase shift between the current wave and the voltage wave observed at the terminals of a load supplied with AC power at a given frequency.
Self-Discharge - The loss of useful capacity of a battery on storage due to internal chemical action (local action).
Microsecond - 1,000,000th of a second (mS).
RS422A (Recommended standard RS422A) - Standard RS232C is sufficient for transmissions in a normal environment. For transmissions in a disturbed environment or over long distances, standard RS422A offers a differential operation option, with a balanced voltage, ensuring far superior performance. What is more, it can be used for multipoint links, with generally up to ten connection points (one sender and up to ten receivers).
Power factor (l) - Ratio between the active power P supplied to a load and the apparent power S supplied to said load by an AC power supply.
Thermistor - A temperature sensitive resistor, usually made from specially processed oxides.