17-May-04
EPR-16 – LinkSwitch 2.75 W Charger/Adapter
9.4 Output Ripple Measurements
9.4.1 Ripple Measurement Technique
For DC output ripple measurements, a modified oscilloscope test probe must be utilized
in order to reduce spurious signals due to pickup. Details of the probe modification are
provided in Figure 17 and Figure 18.
The 5125BA probe adapter is affixed with two capacitors tied in parallel across the probe
tip. The capacitors include one (1) 0.1 µF/50 V ceramic type and one (1) 1.0 µF/50 V
aluminum electrolytic.
Probe Ground
Probe Tip
Figure 17 – Oscilloscope Probe Prepared for Ripple Measurement.
(End cap and ground lead removed).
Figure 18 – Oscilloscope Probe with Probe Master 5125BA BNC Adapter.
(Modified with wires for probe ground for ripple measurement and two
parallel decoupling capacitors added).
Power Integrations
Page 21 of 36
Tel: +1 408 414 9660 Fax: +1 408 414 9760
www.powerint.com
POWERINT [ Power Integrations ]
