Intel ATX User Manual

Electrical
Design Guide 17
3.2.5 Output Ripple Noise - Required
The output ripple and noise requirements listed in the below table shall be met
throughout the load ranges specified for the appropriate form factor and under all input
voltage conditions as specified in Table 3-1
.
Ripple and noise are defined as periodic or random signals over a frequency band of
10 Hz to 20 MHz. Measurements shall be made with an oscilloscope with 20 MHz of
bandwidth. Outputs should be bypassed at the connector with a 0.1μF ceramic disk
capacitor and a 10 μF electrolytic capacitor to simulate system loading.
Refer to Figure 3-1
for the differential noise measurement setup.
Table 3-5: DC Output Noise/Ripple
Output Maximum Ripple and Noise (mV p-p)
+12V1DC 120
+12V2DC 120
+5VDC 50
+3.3VDC 50
-12VDC 120
+5VSB 50
Figure 3-1: Differential Noise Test Setup

Intel ATX Specifications

General

Brand	Intel
Model	ATX
Category	Power Supply
Language	English