Spire Jewel 400W SP-ATX-400W-PFC User Manual
Product codes
SP-ATX-400W-PFC
Version:A/0 Page 8 of 17
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2.2.6 Output Ripple/Noise
The output ripple/noise requirements listed in Table 5 should be met
throughout the load ranges specified and under all input voltage conditions as
specified. Ripple and noise are defined as periodic or random signals over a
frequency band of 10 Hz to 20MHz. Measurements shall be made with an
oscilloscope with 20 MHZ bandwidth. Outputs should be bypassed at the
connector with a 0.1μF ceramic disk capacitor and a 10μF electrolytic capacitor
to simulate system loading. See Figure1.
throughout the load ranges specified and under all input voltage conditions as
specified. Ripple and noise are defined as periodic or random signals over a
frequency band of 10 Hz to 20MHz. Measurements shall be made with an
oscilloscope with 20 MHZ bandwidth. Outputs should be bypassed at the
connector with a 0.1μF ceramic disk capacitor and a 10μF electrolytic capacitor
to simulate system loading. See Figure1.
Figure1. Differential Noise Test Setup
Power Supply
Gene ral Notes:
1.Load the output with its minimum load current.
2.Connect the probes as shown.
3.Repeat the measurement with maximum load on the output.
AC Ground
V out
V return
Load
Scope
10 μ F
0.1 μ F
Loa d must be
isolat
ed from the
ground of the
power supply
AC Hot
AC Neutral
Table 5. DC Output Ripple/Noise
Output
Max. Ripple
(mVpp)
Max. Ripple& Noise
(mVpp)
+12 VDC
120
240
+5 VDC
50
100
+3.3 VDC
50
100
-12 VDC
120
240
+5 VSB
50
100