Could anyone explain to me how to convert rpm or hertz into cycles/rev for measurements of bearing frequencies.

rpm = rev/minute
cpm = cycles/minute

cpm = rpm when vibration frequency is at rotational speed (1xSS)

Hertz = cycles/second

Hertz * 60 = rpm = cpm

Not sure what you mean by cycles/rev.

Walt

If I understand what you mean by cycles/rev is vibration frequency in orders of speed, you simply divide the vibration peak frequency by rotational frequency. Almost all analysers have built in features to express X axis in terms of orders of speed (i.e. cycles/rev).