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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 (500 mA
or 300 V).
All manuals and user guides at all-guides.com
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 maximum mA (30 mA per gel) and maxi-
mum V (180 V) settings, 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 indi-
cator light under "A".
2 Press the UP and DOWN buttons to increase the
LED display value to 60 (2 minigels × 30 mA each).
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
300 V. Press the UP and DOWN buttons to adjust
this value down to 180 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 the timer value 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 60 mA
constant current (2 minigels × 30 mA each). The
voltage output will be <180 V, but may rise during
the electrophoresis run, owing to gradual deple-
tion of the buffer during the run. If the voltage
never exceeds 180 V during the run, then the gels
will run at 60 mA for the entire run. If the volt-
age increases to 180 V, then the power supply
will automatically "crossover" to constant voltage
mode, in order to keep voltage from exceeding
180 V. Now, output current will slowly decrease
below the set limit of 60 mA because the 180 V
set limit is now the limiting value in the circuit.
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