TPF45000-385
POWER SUPPLY
OPERATION MANUAL
11
3 February 2022
Ripple and Noise Notes
Ripple and Noise is measured according to the description below in accordance with JEITA RC-9131C (Sections 7.16,
7.17 and 7.18).
The measurement connection is shown in Fig. 3-1.
C1 (0.1µF Ceramic Capacitor), C2 (47uF Aluminum Electrolytic Capacitor) must be connected in parallel at 30cm from
the output terminals, along the load cable. Attach a maximum 1.5m 50Ω coaxial cable from the ceramic capacitor electrodes
to a filter attachment installed on the oscilloscope. The filter attachment consists of C3 (4700pF film capacitor) in series
with R (50Ω resistor). Use 100MHz bandwidth oscilloscope or equivalent.
In general, output ripple voltage and output spike noise voltage can be reduced by increasing external capacitance.
Figure 2:
Output Ripple Voltage (including Spike Noise) Measurement Method
