Boonton 52000 Series USB CW Power Sensor - Manual (Page 57)

Boonton 52000 Series 5
The RF in the burst is also assumed to be un-modulated. If it were
amplitude modulated, for example, then the measurements would
be likely to vary with time as the modulation and the voltage
measurement made in the power meter would not be synchronized.
Constant amplitude modes of modulation like phase or frequency
modulation are permissible.
What is a dB?
The dBm and dB are common units occurring in power
measurements. ‘dB’ is short for decibel. The dB is a method of
describing the ratio of two powers over a very wide range and is
defined as:
The table below gives some power ratios and their equivalent dB
values:
Power ratio dB
0.001 -30.00
0.01 -20.00
0.1 -10.00
0.25 -6.02
0.5 -3.01
1 0
2 3.01
4 6.02
10 10.00
100 20.00
1000 30.00