American Society for Testing Materials,
which develops standards for electrical, scientific and technical
devices.
EMC
ElectroMagnetic Compatibility:
Equipment operating without causing any electromagnetic interference
or being influenced by any interference.
EMF
ElectroMagnetic Field: The magnetic
field of energy generated by the conductance of electricity.
EMI
ElectroMagnetic Interference: An
electrical disturbance from a natural source, such as lightning,
or an electrical device that causes an undesired effect on
another electrical device. It is the opposite of EMC.
GHz
GigaHertz: 1,000 MHz, or 1,000,000,000
cycles per second.
GSM
Global System for Mobile communications:
The European digital cellular communications standard.
Impedance
Resistance measured in an electrical
circuit stated in Ohms.
Insertion Loss
The attenuation vs. frequency of
a device placed into a circuit, connector, or network. It
is usually expressed as the log of the ratio of a voltage
before vs. after the device is inserted.
MHz
MegaHertz: 1,000 kHz, or 1,000,000
cycles per second.
PCS
Personal Communication Service:
An FCC licensed communication service, usually based on digital
microcellular communications. Portable cell phones are the
most common application
Peak Pulse Current
The maximum allowable
pulse current that does not change the capabilty of a surge
protection device by more than 10 percent.
RF
Radio Frequency: The band of the
electromagnetic spectrum in which radio signals can be transmitted,
defined by the FCC as 10 kHz to 3,000 GHz.
VSWR
Voltage Standard Wave Ratio: A
measure of the degree to which a load is impedance matched
to its transmission line. A perfect match has a value of 1.0.
This is the ratio of maxmum voltage to minimum voltage in
standing wave pattern. It varies from 1 to (plus) infinity.
