Appendix APCI-3xxx
(standard)
68
Gain
The factor by which an incoming signal is multiplied.
Ground
A common reference point for an electrical system.
Impedance
The reciprocal of admittance. Admittance is the complex
ratio of the voltage across divided by the current flowing
through a device, circuit element, or network.
Inductive loads
The voltage over the inductor is U=L.(dI/dt), whereas L is
the inductivity and I is the current. If the current is switched
on fast, the voltage over the load can become very highly for
a short time.
Input impedance
The measured resistance and capacitance between the high
and low inputs of a circuit.
Input level
The input level is the logarithmic relation of two electric
units of the same type (voltage, current or power) at the
signal input of any receive device. The receive device is
often a logic level that refers to the input of the switch. The
input voltage that corresponds with logic “0” is here
between 0 and 15 V, and the one that corresponds with logic
“1” is between 17 and 30 V.
Interrupt
A signal to the CPU indicating that the board detected the
occurrence of a specified condition or event.
Level
Logic levels are defined in order to process or show
information. In binary circuits voltages are used for digital
units. Only two voltage ranges represent information. These
ranges are defined with H (High) and L (Low). H represents
the range that is closer to Plus infinite; the H level is the
digital 1. L represents the range that is closer to Minus
infinite; the L level is the digital 0. The rising edge is the
transition from the 0-state to the 1-state and the falling edge
is the transition from the 1-state to the 0-state.
Limit value
Exceeding the limit values, even for just a short time, can
lead to the destruction or to a loss of functionality.
MUX =
Multiplexer
An array of semiconductor or electromechanical switches
with a common output used for selecting one of a number of
input signals.
Noise immunity
Noise immunity is the ability of a device to work during an
electromagnetic interference without reduced functions.
Noise suppression
The suppression of undesirable electrical interferences to a
signal. Sources of noise include the ac power line, motors,
generators, transformers, fluorescent lights, CRT displays,
computers, electrical storms, welders, radio transmitters, and
others.
Operating voltage
The operating voltage is the voltage that occurs during the
continuous operation of the device. It may not exceed the
continuous limit voltage. Furthermore, any negative
operation situations, such as net overvoltages over one
minute at switching on the device must be taken in
consideration.
