DC Power Supply Models AX501, AX502 and AX503
9
2.3
Control Descriptions
2.3.1 Power On/Off Button
Used to turn the power ON and OFF.
2.3.2 Voltage and Current Adjustments
• Voltage Adjustment:
- Sets the regulated voltage output by turning the large knob
(COARSE adjustment) to the right (increases output) or left
(decreases output).
- Sets the regulated voltage output by turning the small knob
(FINE adjustment) to the right (increases output) or left
(decreases output). The FINE adjustment range represents
approximately 10% of the main range.
- The value of the voltage output is displayed in real time on the
green display.
• Current Adjustment:
- Adjust the value of the current limit by turning the knob to the
right (increases output) or left (decreases output).
- The current value displayed is the value of the output current
on the red display.
2.3.3 Current “LIMIT” LED
The AX Series Power Supplies provides the ability to limit the current
output. When the “limit” is reached, the power supply will switch to “current”
regulation to ensure the current output and drops the voltage regulation.
Setting a Current Limit:
• Short the output terminals, and adjust the current to the desired
limit (you may need to have a little voltage for the current to flow).
The value of current flow will be displayed on the appropriate dis
-
play.
• Turn the voltage output off and connect to the sample. As the volt
-
age is increased, if the current reaches the set limit, the “LIMIT”
LED will turn on, and the current will no longer increase.
• The current limit may be overridden simply by increasing the cur
-
rent output manually.
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