Stopwatch and Timer Calibrations - National Institute of Standards ...
Stopwatch and Timer Calibrations - National Institute of Standards ...
Stopwatch and Timer Calibrations - National Institute of Standards ...
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The Totalize Method <br />
Section 6<br />
The Totalize Method<br />
The totalize method partially eliminates the measurement uncertainty from human<br />
reaction time, but requires two test instruments: a calibrated signal generator,<br />
<strong>and</strong> a universal counter.<br />
6.A. Calibration Procedure for the Totalize Method<br />
The counter is set to TOTALIZE, with a manual gate. A signal from a calibrated<br />
synthesized signal generator is connected to the counter’s input, <strong>and</strong> the<br />
laboratory’s primary frequency st<strong>and</strong>ard is used as the external time base for the<br />
synthesizer <strong>and</strong> the counter (Figure 13). The frequency should have a period at<br />
least one order <strong>of</strong> magnitude smaller than the resolution <strong>of</strong> the stopwatch. For<br />
example, if the stopwatch has a resolution <strong>of</strong> 0.01 s (10 ms); use a 1 kHz frequency<br />
(1 ms period). This provides the counter with one more digit <strong>of</strong> resolution than<br />
the stopwatch.<br />
Figure 13. Block diagram <strong>of</strong> the totalize method.<br />
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