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4. Technical description
4.1 Materials
The main components in the EPS 301 power supply are made of the following materials.
Instrument box Aluminium
Display holder Polypropene (PP). UL94V0
Keyboard Polyester
Output sockets Acetalplastic (POM). UL94V0
Rubber feet Polyurethane
4.2 Front panel
On the front panel there is a numerical display illustrated with the symbols, V, mA, and h.m., a
keyboard with six membrane keys, a light emitting diode that lights when voltage is applied (HV on) and
output sockets for two electrophoresis units.
4.3 Display
A four digit numeric display guides you through the programming, shows actual parameter values during
the electrophoresis and final parameter values afterwards. It also shows error messages.
Figure 1, inside front cover, shows the display in the End position when power is switched on.
4.4 Keyboards
SET/ENTER
Puts the instrument into its program mode. Pressing SET/ENTER in the program mode enters a value, if
valid, and moves the program to the next parameter.
In the RUN mode, pressing SET/ENTER allows you to make changes in the program during a run.
Valid values are: voltage 5-300 V, current 10-400 mA, time 0.01-23.59 h, or timer off - - - -.
UP/DOWN
Changes the parameter value V, mA, and h.m. when the display is flashing. Numerical values are
changed in an accelerating manner when the key is held down. Clicking / changes the value in pre-set
increments. The values will automatically change from maximum to minimum value or vice versa, except
for the time (h.m.) where the signs - - - - are placed between the minimum and maximum values
indicating that the timer is switched off.
RUN
Starts the run and puts the program into RUN mode. The light (HV on) is switched on.
VIEW
In run mode, VIEW switches between the actual values for voltage, current and elapsed time. Pressing
VIEW for more than three seconds starts automatic switching between the actual values for voltage,
current and elapsed time. This automatic switching is stopped by pressing VIEW or RUN.
In End mode, VIEW switches between the end parameter values.
STOP
Stops the run and puts the instrument in End mode. The voltage and the light (HV on) are switched off.
By pressing VIEW the end parameter values are displayed.
enter
set
run
STOP
view
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EPS 301 - User Manual