22.214.171.124 Testing Equipment
(a) The instruments shall be the recording type and shall be capable of detecting signals at intervals of 0.01 s.
(b) The measuring chain, including the recording device for recording measured values as a function of time, shall be designed with a system frequency of at least 1 000 Hz.
(c) The instruments shall provide data for plotting the buffer performance curves showing time intervals, travel of test weight, velocity of test weight, and retardation of test weight during the buffer stroke, and the data shall be accurate to within the following tolerances:
(1) Time increments and total time shall be recorded with an error of less than ±0.5%.
(2) The position of the test weight at each time interval shall be recorded with an error of less than ±0.1%.
(3) Time, travel, velocity, and retardation shall be determined by means of a device that provides the accuracy specified.