Magtek InSpec 9000 Manuel d'utilisateur télécharger pdf (Page 35)

Section 3. Operation

The value of the reference signal amplitude is traceable to the Primary Standard as established

by the United States National Institute for Standards and Technology (NITS), formerly the

National Bureau of Standards. Figure 3-12 shows the reference amplitude and the related

boundaries for within spec, marginal, or out of spec. These values as well as the values for the

other parameters below are listed in Appendix C (from 7811). Composite values (from 7811-2

and 7811-6) are listed in the ISO Limits under the View Menu.

Figure 3-12. Reference Amplitude

Bit Size

The bit size, or bit cell, is the distance between two clocking flux transitions. This distance is the

“zero” bit. The ISO standard abbreviates the bit size as Bin and calls it Individual Flux

Transitions Spacing Variation. Figure 3-13 shows the bit size, the subinterval, the adjacent bit

and the adjacent subinterval.

Sub. Int.

The Sub Int., or subinterval, is simply the distance of the bit cell divided by two. Two

subintervals form a “one” bit, shown in Figure 3-13 as Sin. The ISO standard abbreviates the

subinterval as Sin and calls it Subinterval Spacing Variation.

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Magtek InSpec 9000 Manuel d'utilisateur Page 35