Velleman PS3003L - Manual (Page 4)

PS3003L HQ POWER 4
4. Operation
1) Using the device as a C.V. source
Turn both current adjustments (3) to the extreme right prior to activating the device. Activate the device. The
current-limit protection can be set arbitrarily. Connect a proper variable load and adjust its resistance to make
the current equal to the protection point. Meanwhile, fine-tune the current adjustments (3) to let the C.C.
indicator in critical state.
2) Connecting the Load
The load is connected as shown in the figure above. You can read the output current (2) and the output
voltage (1) from the display as soon as the device has been switched on. The C.V. indicator (8) is lit if the
device is in the C.V. mode. The C.V. LED is off and the C.C. LED will light if the Amp display indicates a value
that exceeds the installed value. When this happens, the device will automatically go into the current-limiting
mode. Install a load that will allow the device to function normally.
3) Using the device as a C.C. source
Use the power switch (7) to activate the device. Turn adjustments (4) to the extreme right and turn
adjustments (3) to the extreme left. Connect the load. Adjust (3) until the desired current is obtained.
5. Safety Prescriptions
• The PS3003L enjoys optimal protection thanks to the short-circuit protection and the current-limiting point.
However, the power loss of the power transistors is maximal in case of a short circuit. Consequently, the device
should be switched off in order to protect it from damage.
• Store the device in a dry and well-ventilated environment and wipe it clean regularly with a damp cloth. Remove
the power plug if the device is to be stored for a prolonged period of time.
• Cut off the input voltage prior to cleaning the device.
• This device is a large power source. The device should be well-ventilated when working at max. power in order to
avoid overheating. Keep in mind that the surface of the heat sink is too hot to touch when the device is being used
at max. power.
• Improper operation of the device and an excessive ambient temperature may cause certain internal components
to fail. When this happens, the actual output voltage may exceed the rated output voltage. PROCEED WITH
CAUTION WHEN USING THIS DEVICE AND AVOID UNNECESSARY DAMAGE TO THE LOAD.
• The 3-pins ground terminal of the power cord should be grounded securely in order to ensure safe operation of
the device.
For more info concerning this product, please visit our website www.hqpower.com.
The information in this manual is subject to change without prior notice.