Technical Product Specification

Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS System Power Sub-system
74 Intel order number G38159-002 Revision 1.2
2.4.2.13 Common Mode Noise
The Common Mode noise on any output does not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
 The measurement shall be made across a 100Ω resistor between each of DC outputs,
including ground, at the DC power connector and chassis ground (power subsystem
enclosure).
 The test set-up shall use a FET probe such as Tektronix model P6046 or equivalent.
2.4.2.14 Ripple/Noise
The maximum allowed ripple/noise output of each DC/DC Converter is defined in below Table
95. This is measured over a bandwidth of 0Hz to 20MHz at the PDB output connectors. A 10F
tantalum capacitor in parallel with a 0.1F ceramic capacitor are placed at the point of
measurement.
Table 88. Ripple and Noise
+3.3V
+5V
-12V
+5VSB
50mVp-p
50mVp-p
120mVp-p
50mVp-p
The test set-up shall be as shown below.
AC HOT
POWER SUPPLY
AC NEUTRAL
V
OUT
RETURN
V
AC GROUND
LOAD
SCOPE
LOAD MUST BE
ISOLATED FROM
THE GROUND OF
THE POWER
SUPPLY
10uF
.1uF
GENERAL NOTES:
1. LOAD THE OUTPUT WITH ITS MINIMUM
LOAD CURRENT.
2. CONNECT THE PROBES AS SHOWN.
3. REPEAT THE MEASUREMENTS WITH THE
MAXIMUM LOAD ON THE OUTPUT.
SCOPE NOTE:
USE A TEKTRONIX 7834 OSCILLOSCOPE WITH 7A13 AND
DIFFERENTIAL PROBE P6055 OR EQUIVALENT.
Note:
When performing this test, the probe clips and capacitors should be located close to the load.
Figure 31. Differential Noise test setup
2.4.2.15 Timing Requirements
Below are timing requirements for the power on/off of the PDB DC/DC converters. The +3.3V,
+5V and +12V output voltages should start to rise approximately at the same time. All outputs
must rise monotonically.