EPR-93 Datasheet, PDF (30/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 93 - 32 W/81 W Peak Supply Using PeakSwitch- (PKS606Y)

EP-93 – 30 V, 1.07 A, 2.7 A (peak), Universal Input Supply
22-Jun-2006
12 Output Ripple Measurements
12.1.1 Ripple Measurement Technique
For DC output ripple measurements, a modified oscilloscope test probe must be used to
reduce spurious signals due to pickup. Details of the probe modification are provided in
Figure 30 and Figure 31.
The Probe Master 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. The aluminum electrolytic type capacitor is
polarized, so proper polarity across DC outputs must be maintained (see below).
Probe Ground
Probe Tip
Figure 30 – Oscilloscope Probe Prepared for Ripple Measurement (End Cap and Ground Lead Removed).
Figure 31 – Oscilloscope Probe with Probe Master 5125BA BNC Adapter (Modified with Wires for Probe
Ground for Ripple Measurement, and Two Parallel Decoupling Capacitors Added).
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