Like all switching power supplies, BEAR BP Series power converters have residual noise on their
outputs. This noise is specified as the peak-to-peak AC ripple
and is measured with a 20 MHz bandwidth.
To measure actual ripple voltage, BEAR test
engineers take care to assure minimum
pickup from the converter's stray magnetic fields. We place a 100nF capacitor across the output terminals of the converter and
position a passive 20 MHz
filter between the capacitor and a coaxial cable.
Figure 2 shows the output noise
voltage on a 3.3 V 10 W BP Series BEAR Power Supply to be about 25 mV p-p,
or less than 1%.
Figure 2. Output noise
voltage on a 3.3 V 10 W BP Series BEAR Power Supply