ISO/IEC 7811-2:2018 pdf download – Identification cards — Recording technique — Part 2: Magnetic stripe: Low coercivity.
3.1 primary standard set of reference cards established by the Physikalisch-Technische Bundesanstalt (PTB) and maintained by PTB, Q-Card, and Card Testing International secretariat that represent the values of U R and I R designated RM7811-2 3.2 secondary standard reference card designated RM7811-2 that is related to the primary standard as stated in the calibration certificate supplied with each card Note 1 to entry: Secondary standards can be ordered from Q-Card, 301 Reagan Street, Sunbury, PA 17801, USA. The source of secondary standards will be maintained at least until 2018. 3.3 unused un-encoded card card possessing all the components required for its intended purpose, which has not been subjected to any personalization or testing operation, and which has been stored in a clean environment with no more than 48 h exposure to daylight and at temperatures between 5 °C and 30 °C and humidity between 10 % and 90 % without experiencing thermal shock 3.4 unused encoded card card according to 3.3 that has only been encoded with all the data (magnetic, embossing, electronic, etc.) required for its intended purpose 3.5 returned card card according to 3.4 after it has been issued to the card holder and returned for the purpose of testing 3.6 flux transition location of the greatest rate of change with distance of the magnetisation 3.7 reference current I R minimum recorded current amplitude under the given test conditions that causes, on the reference card, a readback signal amplitude equal to 80 % of the reference signal amplitude U R, at a density of 8 flux transitions per millimetre (200 flux transitions per inch) as shown in Figure 6
3.11 average signal amplitude U A sum of the absolute value of the amplitude of each signal peak (U i ) divided by the number of signal peaks (n) for a given track over the length of the magnetic stripe area 3.12 reference signal amplitude U R maximum value of the average signal amplitude of a reference card corrected to the primary standard 3.13 physical recording density number of flux transitions per unit length recorded on a track 3.14 bit density number of data bits stored per unit of length 3.15 bit cell distance between two clocking flux transitions as shown in Figure 10 3.16 subinterval distance that is nominally half the distance between two clocking flux transitions as shown in Figure 10 4 Conformance A prerequisite for conformance with this document is conformance with ISO/IEC 7810. An identification card is in conformance with this document if it meets all mandatory requirements specified herein. Default values apply if no others are specified. 5 Physical characteristics of the identification card 5.1 General The identification card shall conform to the specification given in ISO/IEC 7810. WARNING — The attention of card issuers is drawn to the fact that information held on the magnetic stripe may be rendered ineffective through contamination by contact with dirt and certain commonly used chemicals including plasticizers. It should also be noted that any printing or screening placed on top of the magnetic stripe must not impair the function of the magnetic stripe.