5.1.6 Test measurements Either the

5.1.6 Test measurements Either the r.m.s. value of the voltage, U2 , is measured using the measuring instrument of Figure D.1, or the r.m.s. value of the current is measured using the measuring instrument of Figure D.2. The D.1 instrument gives a more accurate measurement than the D.2 instrument if the waveform is non-sinusoidal and the fundamental frequency exceeds 100 Hz. Alternatively, the peak value of the voltage, U2 , is measured using the measuring instrument described in Clause D.1.If the voltage, U2 , is measured using the measuring instrument described in Clause D.1, the following calculation is used: TOUCH CURRENT(A) = U2 / 500 NOTE Although r.m.s. values of TOUCH CURRENT have traditionally been measured, peak values provide better correlation with the response of the human body to non-sinusoidal current waveforms. None of the values measured in accordance with 5.1.6 shall exceed the relevant limits in Table 5A, except as permitted in 2.4 (see also 1.5.6 and 1.5.7) and 5.1.7.