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The power supply unit does not display anything or does not reach the voltage

The power supply units regulate the current flow via the voltage, which is a result of Ohm's law. If no load is connected, no current can flow.

If the current limit is set to zero, the voltage will also drop to 0.

Setting the voltage

  • Turn the voltage coarse and fine control until the desired output voltage is shown on the display
  • Make sure that the set voltage does not exceed the maximum supply voltage of the load to be operated
  • If the voltage cannot be increased any further, the current limit is probably set too low, increase it
  • The current flow then results from the ohmic resistance

 

Setting the current limit

  • Set a very low voltage of approx. 1 V- to avoid sparking and create a short circuit with the connected test leads
  • The power supply unit then switches from constant voltage mode to constant current mode (the display shows C.C instead of C.V)
  • Now turn the coarse and fine current control until the desired output current is shown on the display
  • Once the current limit has been successfully set, the short circuit can be released again
  • Then increase the voltage back to the desired value
  • When you work with the current limitation, the voltage is reduced according to the applied resistance

If no power is flowing, check the connection.