Constant Voltage Operations; Constant Current Operations; Timed Operations - Fisher Scientific FB300-2 Manual Del Operador

To stop a run in progress, press the Run key or the gray ON/OFF key. The display will change to
"OFF" signifying that the output is no longer energized. Pressing run again resumes the run from
the previous point (i.e. for a timed run). Pressing any other key will return to setup mode in either
constant voltage or constant current mode as appropriate.
During a run, the display will automatically cycle between voltage, current, and time displays.
Voltage and current is displayed as actually measured by the FB300. When displaying the
controlled setpoint, i.e. voltage for constant voltage control, the arrow keys can be used to modify
the setpoint. The limit parameter cannot be changed during a run. The time parameter displays
elapsed time for an untimed run, and time left for a timed run.

Constant Voltage Operations

Press the constant key (labeled K) until the LED indicating "Volts" is illuminated. Each time the
constant key is pressed, the FB300 will display the last saved setpoint value for that particular
mode. Use the UP and DOWN arrow keys to change the setpoint to the desired value (10-300
volts). The FB300 will not allow setting a voltage setpoint outside of the allowed range. Press
and hold either arrow key to quickly change the setpoint.
The limit parameter, in this case current, is normally set to the power supply maximum value of
400 mA. To set a lower limit value, press the Set key until the LED indicating "mAmps" is
illuminated. Use the UP and DOWN arrow keys to change the limit to the desired value (4-400
mA). The FB300 will not allow setting a current limit outside of the allowed range.
In addition, the FB300 will never exceed the maximum power output specification of 75W. When
starting a run, the power supply calculates a maximum limit parameter, above which the power
supply maximum power output rating would be exceeded. If this value is lower than the limit
setpoint entered, the FB300 will use this lower limit parameter.

Constant Current Operations

Press the constant key (labeled K) until the LED indicating "Amps" is illuminated. Each time the
constant key is pressed, the FB300 will display the last saved setpoint value for that particular
mode. Use the UP and DOWN arrow keys to change the setpoint to the desired value (4-400 mA).
The FB300 will not allow setting a current setpoint outside of the allowed range. Press and hold
either arrow key to quickly change the setpoint.
The limit parameter, in this case voltage, is normally set to the power supply maximum value of
300 volts. To set a lower limit value, press the Set key until the LED indicating "Volts" is
illuminated. Use the UP and DOWN arrow keys to change the limit to the desired value (10-300
volts). The FB300 will not allow setting a voltage limit outside of the allowed range.
In addition, the FB300 will never exceed the maximum power output specification of 75W. When
starting a run, the power supply calculates a maximum limit parameter, above which the power
supply maximum power output rating would be exceeded. If this value is lower than the limit
setpoint entered, the FB300 will use this lower limit parameter.

Timed Operations

It is possible to enter an amount of time for the power supply to provide power, after which it will
automatically shut off. Use this feature for timed runs.
Press the Set key until the LED indicating "Time" is illuminated. Use the UP and DOWN arrow
keys to change the time duration to the desired value (0-999 minutes). A time duration of zero
effectively disables timed run mode.
When running a timed run, the time parameter displays the time remaining in the run. When
running a non-timed run, the time parameter displays the elapsed time during the run
FB300-2 MANUAL Page 6 7608001 Rev A 8/02