MagTek InSpec 9000 - Manual (Page 73)

Appendix B. Glossary
63
The second category is referred to as:
Adjacent Bit-Cell Variation
Bit to Bit Jitter - BBJ
Bin+1 - (Bit Cell to Bit Cell jitter)
Sin+1 - (Subinterval to Subinterval jitter)
Long Term Jitter
See
"Jitter"
Low-Co or LoCo
Colloquial term for low coercivity magnetic recording material. Typically, the value of
low coercivity media is considered to be between 250 to 800 oersted (typically 250 to
600 for ISO 7811-2 compliance).
LTJ
See
"Jitter"
Magnetic Field
A physical phenomenon in which a force is created either from the flow of electric
current in a conductor or from the presence of magnetic poles of a permanent magnet.
Oersted
Unit of measure of coercivity.
Parity Bit
An extra bit included on each character code to provide a means to test for correct read
back. The ISO defined tracks include an ODD parity bit for each character. For
example: Track 1 character "A" has the following serial 6-bit data code: 100001 This
code has an even number on ONE bits. Therefore the parity bit added after the last data
bit is a ONE bit in order to have the entire character code possess an ODD number of
ONES bits. The entire 7-bit character code for the character "A" (Track 1) is: 1000011.
PTB - Physikalisch-Technische Bundesanstalt
PTB certifies Reference cards for signal amplitude and maintains traceability to the
Primary Standard.
Reference Card
This card provides the Signal Amplitude reference for comparison of all cards used in the
ISO interchange. The Reference Card is certified at a PTB (Physikalisch-Technische
Bundesanstalt) which maintains traceability to the Primary Standard as established by the
United States National Institute for Standards and Technology (NIST) - formerly
National Bureau of Standards (NBS).