Hoefer PS200HC - Manual (Page 21)

4 Press the SELECT button to position the indicator
light under the Clock symbol. If desired, use the
UP button to set the timer to a desired duration. If
the run is continuous, set the timer value to “0”.
5 Press the START/STOP button to start the run.
Example: Set up conditions for running a semi-dry
transfer of a standard-size PAGE gel at 0.18 A and
30 V, with automatic crossover.
The power supply can automatically crossover between
two different maximum settings, if desired. This will
be illustrated below.
1 Press the CONSTANT button to position the
indicator light under “A”.
2 Press the UP and DOWN buttons to increase the
LED display value to 0.18.
3 Press the SELECT button to position the indicator
light under “V”. Observe that the volt limit has
been automatically set to the maximum value of
200 V. Press the UP and DOWN buttons to adjust
this value down to 30 V.
4 Press the SELECT button to position the indicator
light under the Clock symbol. If desired, use the
UP button to set the timer to a desired duration. If
the run is continuous, set timer to 0.
5 Press the START/STOP button to start the run.
Both Voltage and Current are monitored during
the run. The power supply initially outputs 0.18 A
constant current. The voltage output will be
<30 V, but may rise during the transfer run, due
to gradual depletion of the buffer during the run.
If the voltage never exceeds 30 V during the run,
then the gels will run at 0.18 A for the entire
run. If the voltage increases to 30 V, then the
power supply will automatically “crossover” to
constant voltage mode, in order to keep voltage
from exceeding 30 V. Now, output current will
slowly decrease below the original 0.18 A setting
because 30 V is now the limiting value in the
curcuit.
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Note: If this crossover condi-
tion occurs and is not desired,
change the voltage or current
setting to the power supply’s
operational maximum (2.0 A or
200 V).