FP2
Two-byte floating-point data type. Default data logger data type for stored data. While
IEEE4 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.
frequency domain
Frequency domain describes data graphed on an X-Y plot with frequency as the X axis.
VSPECT vibrating wire data is in the frequency domain.
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.
FTP
File Transfer Protocol. A TCP/IP application protocol.
full-duplex
A serial communications protocol. Simultaneous bi-directional communications.
Communications between a serial port and a computer is typically full duplex.
G
garbage
The refuse of the data communications world. When data is sent or received incorrectly
(there are numerous reasons why this happens), a string of invalid, meaningless characters
(garbage) often results. Two common causes are: 1) a baud-rate mismatch and 2)
synchronous data being sent to an asynchronous device and vice versa.
Appendix C. Glossary270
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