Hoefer PS2A200 User Manual
Page 15
Time parameters
The run duration can be programmed (00:01–
99:59 hrs), unlimited, or set for a specified number
of volt-hours. The timed/hold option (T/Hold)
delivers 5 V to the load at the end of the timed run
to minimize band diffusion in gradient gels.
Power supply output limits
The PS2A200 can be programmed to limit only
voltage (V), only current (mA), voltage and current
together (V&mA), or only power (W). The power
supply will operate at the set limits provided the
“load,” or power requirement, does not exceed
the power supply rating. When both current and
voltage limits are set, the load draws the required
power within those limits.
“Crossover” occurs when the second parameter
limit is reached as system resistance changes. At
this point the second parameter is held constant
and the previously unchanging parameter is
allowed to adjust downward as system resistance
changes. (System resistance is affected by discon-
tinuous buffers and changes in temperature.)
When the power supply is delivering power (the
HV lamp is lit), the location of the cursor indi-
cates which parameter is being held constant.
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