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A conventional laboratory power supply (i.e.
one which has variable voltage and variable current limit) has
two modes of operation - constant voltage or constant current.
On a PowerFlex PSU, however, it is possible
to set a current limit that is higher than the capability at a
specific voltage. This provides maximum flexibility, but gives
the potential for the PSU to enter a power limit
mode.
As an alternative to PowerFlex operation the
CPX400 can be used as a conventional fixed range power supply
of either 60V/7A or 20V/20A at the press of a button.
Fixed range mode ensures that, whatever the
load, the output can only be in constant voltage or constant
current mode and never in power limit. Additionally finer
resolution is provided on the current or voltage controls
respectively.
A further button offers full customisation
of voltage and current limits which can be set to suit the users
application. This has the advantage that the controls cover the
exact voltage and current range required, providing easier
setting and reduced risk of error.
For example, the range could be set to 30V
and 14A to create a 30 volt PSU of maximum current capability.
Alternatively it could be set to 5V and 3A if this was all that
was required for a particular application.
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