-13-
TDK-Lambda
HWS1500 Series
INSTRUCTION MANUAL
5-9. Output Ripple & Noise
Maximum ripple & noise value in specifications is measured according to measurement circuit specified by
JEITA-RC9131A. When Load lines are longer, ripple & noise becomes larger. In this case, electrolytic capacitor, film
capacitor, etc. might be necessary to use across the load terminal. The output ripple & noise cannot be measured
accurately if the probe ground lead of oscilloscope is too long.
5-10. Series Operation
For series operation, either method (A) or (B) is possible.
There might be a step in the rise waveform during series operation.
(Note1) Please connect a diode for by-pass when using method (A) of the series operation.
Please use the diode with rated forward current is equal or more than load current and that the rated
maximum reverse voltage is higher than output voltage for each power supply.
C3
R:50Ω
C1:4700pF
C2:100uF
C3:0.47uF
Bandwidth
100MHz
Co-axial cable
1.5m 50Ω
Oscillo-Scope
R
C1
+S
+
－
－
S
Power Supply Unit
+
Power
supply
－
+
Power
supply
－
+
Load
－
+
Load
－
+
Power
supply
－
+
Power
supply
－
+
Load
－
Method (A)
Method (B)
(Note1)
C2
Load
150mm
