ABSTRACT
CHAPTER OUTLINE The PPM .......................................................................................................................................91 DIN Scale .....................................................................................................................................92 Nordic Scale ................................................................................................................................92 BBC Scale ....................................................................................................................................92 Test Level ....................................................................................................................................93 Extra Functionality....................................................................................................................93
Bibliography.................................................................................................................................94
THE PPM The PPM (Peak Program Meter) is more level orientated and thus works signif-
icantly faster than the VUmeter. The instrument’s time constant, the integration
time, that is, the time it takes the reading to reach a point 2 dB below the refer-
ence indication, is 5 ms. In earlier standards the integration time was listed as 10
ms. However, this is rather a question of definition. It still takes 10 ms to reach
a reading 1 dB below the reference indication. In any event, the short integration
time ensures that peaks of short duration basically can be read at (nearly) the
correct level.
