Pulse Loading; Capacitive Loads; Reverse Current Loading - HP E3610A Operating And Service Manual

Pulse Loading Consklerations
The power supply will automatically cross over from
constant-voltage to constant-current operation in response
to an increase(over the preset limit) in the output current.
Although the preset limit may be set higher than the
average output current, Ngh peak currents(a8 occur in pulse
loading) may exceed the preset current limit and cause
crossover to occur. If this crossover limiting is not desired,
set the preset limit for the peak requirement and not the
average.
Capacitive Loads
An internal capacitor, across the output terminals of the
power supply, helps to supply high-current pulses of short
duration during constant voltage operation. Any capacitance
added externally will improve the pulse current capability.
but will decrease the safety provided by the current limiting
circuit. A high-current pulse may damage load components
t>efore the average output current is large enough to cause
the current limiting circuit to operate.
Reverse Current Loading
Active loads connected to the power supply may actually
deliver a reverse current to the power supply during a
portion of its operating cycle. An external source can not be
allowed to pump current into the supply without loss of
regulation and possible darnage to the output capacitor. To
avoid these effects, it is necessary to preload the supply
with a dummy load resistor so that the power supply
delivers current through the entire operating cycle of the
load devices.
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