Hioki MEMORY HiCORDER 8855, Instruction Manual

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APPENDIX 4
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Appendix 2 Glossary
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A/D Conversion of an analog quantity into a digital quantity
Aliasing Phantom signal components; a phenomenon that occurs if sampling
frequency is low in relation to the frequency of the sampled signal (see
Appendix 3.2).
Analog
Continuous physical quantity such as voltage or current
Attenuator Device for reducing the level of a signal
Bit Smallest unit of binary information
Byte
Unit of information. 1 byte is made up of 8 bits.
Channel (CH) Input signal route
Chassis Metal frame of the instrument
Comment
Notations such as the recording paper and printable measurement conditions
that can be entered by the user.
Common mode
Voltage between ground and measurement input line
Cutoff frequency Point where the filter output amplitude is 1/ of the input.
Digital Discrete physical quantity
DIV (division)
Unit to indicate the measurement
Dynamic range Ratio of maximum vs. minimum amplitude that can be displayed
FFT Fast Fourier Transform
File
A collection of data on a medium such as tape
LED Abbreviation of "light-emitting diode"
Logic-level Waveform expressed as High and Low level
Logical formatting
Formatting that writes basic file structure information to the physically-
formatted disks, making them compatible for use with the 8855 system.
Low-pass filter
Filter that passes through only signals below a certain frequency
Memory A device for storing digital data
MS-DOS Personal computer operating system. MS-DOS is a registered trademark of
Microsoft Corporation.
Offset Amount of shift in relation to 0 V when scaling is used
Physical formatting Preparatory formatting necessary before use of floppy disks.
Position When referring to the position of the waveform along the measurement
range on the display, this refers more precisely to the origin, that is the
position corresponding to 0 V.
Pre-trigger The condition of the signal before triggering occurred
Probe Signal line for supplying the signal to the input
PT
Abbreviation of (voltage) "potential transformer"
Recording length Total amount of sampling data expressed as number of increments
Reference junction
compensation
When thermocouples are used, the temperature difference between the object
and the measuring equipment terminal is measured. Reference junction
compensation takes into account the terminal temperature so that the object
temperature can be directly read.
Appendix 2 Glossary