Black Box IEEE 1284 Guia do Utilizador descarregar pdf (Página 24)

Page 24 of 98 The Black Box Toolkit

Shown below is another calibration run from the same PC but with scheduling set to “High”

(the same mode experiment generators typically run in). Close attention should be paid to

the scale on the Y axis and the “Tick Variance” figure displayed in the spreadsheet. The

more processor cycles or ticks that are required per sample the worse any software will

perform. In short, other factors can begin to adversely affect timing precision even when

running a recognised experiment generator. For example, other unknown processes can

interrupt stimulus display or reaction time measurement leading to a spurious result.

Unknown processes can include virus checkers, network activity, unruly drivers etc.

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Black Box IEEE 1284 Guia do Utilizador Página 24