Stopwatch and Timer Calibrations - National Institute of Standards ...
Stopwatch and Timer Calibrations - National Institute of Standards ...
Stopwatch and Timer Calibrations - National Institute of Standards ...
- No tags were found...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
The Totalize Method <br />
Figure 16. Mean reaction times (four operators, 10 runs each) for the totalize<br />
method.<br />
6.B.3. Uncertainty Due to the Counter<br />
For this method, the uncertainty <strong>of</strong> the counter is related to the counter resolution.<br />
The internal time base <strong>of</strong> the counter is not used, because the gate time is controlled<br />
by the manual start/stop function. This method does not use the counter gate or<br />
trigger, so the uncertainties associated with these functions are also eliminated.<br />
The counter is simply used as an event counting device, <strong>and</strong> the uncertainty is<br />
equivalent to ±1 least significant digit on the display.<br />
6.B.4 Device Under Test (DUT) Resolution Uncertainty<br />
Since the totalize method involves observing data from the DUT, the resolution<br />
<strong>of</strong> the DUT must also be considered. For digital indicating devices, resolution<br />
uncertainty is understood to be half <strong>of</strong> the least significant digit, with a rectangular<br />
45