Where:
f = frequency of the dynamometer speed sensing device, accurate to at least four significant figures.
droll = nominal roll diameter, accurate to the nearest 1.0 mm, consistent with § 1066.225(d) .
n = the number of pulses per revolution from the dynamometer roll speed sensor.
Example:
f = 2.9231 Hz = 2.9231 s-1
droll = 904.40 mm = 0.90440 m
vact = 8.3053 m/s
Example:
vact = 8.3053 m/s
vref = 8.3000 m/s
verror = 8.3053 - 8.3000 = 0.0053 m/s
40 C.F.R. §1066.235