Tutorial 6
E364xA User’s and Service Guide 177
The output will also change due to changes in the load. As the load increases the
output current will cause a small drop in the output voltage of the power supply
due to the output impedance R. Any resistance in the connecting wire will add to
this resistance and increase the voltage drop. Using the largest possible hook up
wire will minimize the voltage drop. Using the remote sense leads at the load will
compensate for lead resistance in the load leads.
Figure 6-6 Simplified diagram of 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.
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