InSpec Sampler Controller SECTION 32: DEFINITION OF TERMS & SYMBOLS
Addition of foreign matter, solid, liquid or gaseous (ionized gases), that may produce a
reduction of dielectric strength or surface resistivity.
Plastic Leaded Chip Carrier
Programmable Read Only Memory
Positive Temperature Coefficient
Rout-mean-square (rms value of an AC sine wave is 0.707 times the peak value.)
Physical Link Layer Telecommunications Protocol
Physical Link Layer Telecommunications Protocol
Receive – Telecommunications (RS232
Receive (non-inverted) – Telecommunications (RS422 or RS485
Receive (inverted) – Telecommunications (RS422 or RS485
Supervisory Control and Data Acquisition
Safety Extra-Low Voltage circuit
An SELV circuit is defined as a circuit that is so designed and protected that under
both normal and single fault conditions, its voltages do not exceed a safe value.
Under normal conditions, the voltage of such a circuit cannot exceed 33 V rms and
46.7 V peak or 70 V DC In the event of a single fault, the voltage cannot exceed 55V
rms and 78 V peak or 140 V DC.
Single Pole, Single Throw (Switching Terminology)
Transient Voltage Suppressor
Transmit – Telecommunications
Transmit (non-inverted) – Telecommunications (RS422 or RS485)
Transmit (inverted) – Telecommunications (RS422 or RS485
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