Term. Flash
A type of memory media that does not require battery backup. Flash
memory, however, has a lifetime based on the number of writes to it. The
more frequently data are written, the shorter the life expectancy.
Term. FLOAT
Four-byte floating-point data type. Default CR1000 data type for Public or
Dim variables. Same format as IEEE4.
Term. fN1
fN1 or F
notch
. First notch frequency. A notch, when referring to digital signal
processing (DSP), is a region in the frequency response at which frequencies
input into the filter are highly attenuated or 'notched out.' Signals input into
the filter at fN1 are completely eliminated, whereas frequencies near the
notch are greatly attenuated but not completely filtered out. A more technical
term is transmission zero,or zero signal transmission through the filter at the
given frequency.
Term. FP2
Two-byte floating-point data type. Default CR1000 data type for stored data.
While IEEE four-byte floating point is used for variables and internal
calculations, FP2 is adequate for most stored data. FP2 provides three or four
significant digits of resolution, and requires half the memory as IEEE4.
Term. FTP
File Transfer Protocol. A TCP/IP application protocol.
Term. full-duplex
A serial communication protocol. Simultaneous bi-directional
communications. Communications between a CR1000 serial port and a PC is
typically full duplex.
Reading list: simplex
(p. 528), duplex (p. 248), half-duplex (p. 517), and full-duplex
(p. 516).
Term. frequency domain
Frequency domain describes data graphed on an X-Y plot with frequency as
the X axis. VSPECT
(p. 532) vibrating-wire data are in the frequency domain.
Term. frequency response
Sample rate is how often an instrument reports a result at its output;
frequency response is how well an instrument responds to fast fluctuations on
its input. By way of example, sampling a large gage thermocouple at 1 kHz
will give a high sample rate but does not ensure the measurement has a high
frequency response. A fine-wire thermocouple, which changes output
quickly with changes in temperature, is more likely to have a high frequency
response.
516
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