The calculation of Sleep and Off Mode power for products powered by a low-voltage dc source must follow the method of calculating On Mode power for such products. Hence:
PSLEEP = PL - PS
POFF = PL - PS
PSLEEP is the calculated Sleep Mode power, in watts,
POFF is the calculated Off Mode power, in watts
PL is the ac power consumption, in watts, of the low-voltage dc source with the unit under test (UUT) as the load, and
PS is the marginal loss of the ac power supply of the source, in watts.