The influence of type 1 A‐weighted tolerances and frequency‐band limits on level measurements is investigated theoretically and is verified experimentally. Three A‐weighting circuits, each of which satisfied type 1 tolerances, were tested with pulse trains with various crest factors; depending on the frequency‐band limits of the measuring system, erroneous level readings could be obtained. For example, at a constant repetition rate of 10 kHz and a crest factor of three, the measured levels obtained with the A‐weighting circuits spanned a range of 4 dB when the frequency‐band limit was increased from 30 to 100 kHz.