01-18-2019, 10:39 AM
Good question . 
I am also looking for a convincing answer. 
I have one capacitor of 4.5 cm disk design and I measured its capacitance - it turned out about 3 pF. But I well remembered that I dropped it from a faulty receiver, where I changed it to a 47 pF capacitor and then the receiver started working. It is highly likely that it was faulty. Therefore, I have a version that the abbreviation CM is the same as PF, but it denotes ceramic capacitors.
I am also looking for a convincing answer. I have one capacitor of 4.5 cm disk design and I measured its capacitance - it turned out about 3 pF. But I well remembered that I dropped it from a faulty receiver, where I changed it to a 47 pF capacitor and then the receiver started working. It is highly likely that it was faulty. Therefore, I have a version that the abbreviation CM is the same as PF, but it denotes ceramic capacitors.
