英文的意思是：根据人类的反应时间从开始到结束，时间间隔的测量用秒表通常有约0.2的不确定性 。如果要计算的话，你可以设定一个开始的时间和结束的时间， 实际的结束时间要考虑0.2秒的不确定性。我认为应该考虑两种情况：多0.2或少0.2秒。
For example, you can compare the voltage output of a multifunction calibrator (e.g. Fluke 5700A) to a 3.5 digit Multimeter, the resolution of unit under test will have a considerable influence on the measurement result and associated uncertainty. In another example, you can compare the length...
tt and ts - stopwatch; last significant digit 0.01 sec. T (temperature) – digital thermometer; last significant digit 0.1 F Data acquisition procedure: measure T and l measure diameters Dt,and fall times tt for 10 teflon spheres measure diameters Ds and fall times ts for 10 steel...
Ameasureofdris Substituting(2)in(1),andassumingthatbias/precisionerrorsarecorrelated (2) s’sarenotknown;useestimatesforthevariancesandcovariancesofthedistributionsofthetotal,bias,and precision errors The total uncertainty of the results at a specified level of confidence is ...