6 Tutorial
Output Characteristics
162 E364xA User’s and Service Guide
Figure 6-6 Simplified diagram of the common mode and normal mode
sources of noise
When the load changes very rapidly, as when a relay contact
is closed, the inductance in the hook up wire and in the
power supply output will cause a spike to appear at the
load. The spike is a function of the rate of change of the
load current. When very rapid changes in load are expected,
a capacitor with a low series resistance, in parallel with the
power supply, and close to the load is the best way to
minimize these voltage spikes.
OUTPUT
TERMINAL
OUTPUT
VOLTAGE
COMMON
MODE
NOISE
<1.5 μArms
NORMAL
MODE
NOISE
R
<5 mVpp
[1]
<0.5 mVrms
[1]
<8 mVpp
[2]
<1 mVrms
[2]
[1] E3646A/E3648A models
[2] E3647A/E3649A models
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