Fisher FIELDVUEDVC6200f Instruction Manual page 334

DVC6200f Digital Valve Controller
Glossary
February 2017
Gain
The ratio of output change to input change.
Hardware Revision
Revision number of the Fisher instrument
hardware. The physical components of the
instrument are defined as the hardware.
Incoming Ramp Rate
The rate at which the valve will move during the
Incoming stroke of the Partial Stroke test. The
default value is 0.25%/second.
Instrument Level
Determines the functions available for the
instrument.
Leak Class
Defines the allowable leakage by a valve when it is
closed. Leak class numbers are listed in two
standards: ANSI/FCI 70‐2 and IEC 534‐4.
Linearity, dynamic
Linearity (independent) is the maximum
deviation from a straight line best fit to the
opening and closing curves and a line
representing the average value of those curves.
Memory
A type of semiconductor used for storing
programs or data. FIELDVUE instruments use
three types of memory: Random Access Memory
(RAM), Read Only Memory (ROM), and
Non‐Volatile Memory (NVM).
Minimum PST Pause Time
During a Partial Stroke test, allows the incoming
stroke to be initiated as soon as the travel reaches
the minimum travel movement.
Non‐Volatile Memory (NVM)
A type of semiconductor memory that retains its
contents even though power is disconnected.
NVM contents can be changed during
configuration unlike ROM which can be changed
only at time of instrument manufacture. NVM
stores configuration restart data.
334
Octet
See byte
Outgoing Ramp Rate
The rate at which the valve will move during the
Outgoing stroke of the Partial Stroke test. The
default value is 0.25%/second.
Partial Stroke Test (PST)
The process of taking the valve from the normal
end to a target position at a preconfigured ramp
rate before returning to the normal end while
gathering data
Parallel
Simultaneous: said of data transmission on two or
more channels at the same time.
Pressure Sensor
A FIELDVUE instrument internal device that
senses the output pressure from the pneumatic
relay.
Random Access Memory (RAM)
A type of semiconductor memory that is normally
used by the microprocessor during normal
operation that permits rapid retrieval and storage
of programs and data. See also Read Only
Memory (ROM) and Non‐Volatile Memory (NVM).
Ramp Rate
See Incoming Ramp Rate and Outgoing Ramp
Rate definitions.
Rate
Amount of change in output proportional to the
rate of change in input.
Read‐Only Memory (ROM)
A memory in which information is stored at the
time of instrument manufacture. You can
examine but not change ROM contents.
Seat Load
Force exerted on the valve seat, typically
expressed in pounds force per lineal inch of port
circumference. Seat load is determined by shutoff
requirements.
Software
Computer programs, procedures, and possibly
associated documentation and data pertaining to
the operation of a computer system.
Instruction Manual
D103412X012