By Jeff C Gust; Robert M Graham; Michael A Lombardi; Physics Laboratory (U.S.). Time and Frequency Division
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Cellular phone networks, for example, sometimes introduce delays that are larger and more 35 ◆ Stopwatch and Timer Calibrations subject to variation from phone call to phone call than wired land networks. Therefore, cell phones should not be used for stopwatch calibrations. Calls made from outside the continental United States are sometimes routed through a communications satellite, introducing delays of about 250 ms. If the first call went through a satellite, and the second call didn’t (or vice versa), a significant uncertainty would be introduced.
11] While it is not possible to guarantee this stability during all phone calls, it is probably safe to say that the stability should be much less than 1 ms during typical calls, which are limited to about 3 min in length. This uncertainty is so small it can be ignored for our purposes. If the radio signals listed in Table 5 are used as a reference instead of a telephone signal, the arrival time of the signal will vary slightly from second to second as the length of the radio signal path changes but not enough to influence the results of a stopwatch or timer calibration.
Boss Page 1 of 2 Figure A1. Sample calibration certificate, page 1. 49 ◆ Stopwatch and Timer Calibrations XXX Calibration Laboratory City, State File: 47821 Date: November 18, 2002 General Traceability Statement: Values and the associated uncertainties supplied by the XXX Calibration Laboratory are traceable to one or more of the following: 1. The values of the units (either base or derived) maintained and disseminated by the National Institute of Standards and Technology (United States of America) or, in special cases and where appropriate, to the National Standards Laboratory of another nation; 2.