Peqlab peqPOWER 300, Инструкция по эксплуатации

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Instruction Manual peqPOWER 300 Volt Power Supply
Note: After stopping (using the STOP key) and restarting an operation, the timer resets and does not
take into account the time that electrophoresis was in progress before it was stopped.
CHOOSING LIMITING PARAMETER SETTINGS
Introduction
The peqPOWER 300 Volt Power Supply is capable of operating at limiting Voltage, or limiting Current.
We recommend operating the peqPOWER 300 Volt Power Supply at limiting voltage for most applica-
tions. See below for more details.
Voltage Limiting
For most electrophoresis methods, resistance increases throughout the run. Limiting the voltage provides
the following advantages:

Current and power decrease throughout the run, providing a greater margin of safety over time.

The same voltage setting can be used regardless of the number or thickness of gels being proc-
essed.
Current Limiting
Discontinuous buffer systems and, to a lesser extent, continuous systems increase resistance during the
run. If you use the current limiting setting on the peqPOWER 300 Volt Power Supply, the voltage will
increase as resistance increases to satisfy Ohm’s law (V=I*R). If no voltage limit is set and a local fault
condition occurs, such as a poor connection, very high local resistance may cause the voltage to in-
crease to the maximum capacity of the power supply. This may lead to local overheating and damage
to the electrophoresis cell or create unsafe conditions. When operating under constant current condi-
tions, set a voltage limit on the power supply at or slightly above the maximum expected voltage.
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