AMETEK DLM 600W Series - Manual (Page 53)

DLM 600W Series
M362161-01 Rev J 3-7
3.4.2 Constant–Current Mode of Operation
The power supply will operate in constant–current mode whenever the load resistance
times the current limit setting is less than the voltage setting. In this mode, the power
supply maintains the output current precisely regulated to the current setting while the
load voltage varies with load requirements. This condition is maintained as long as the
load resistance is less than the voltage setting divided by the current setting. If the load
resistance increases to where the load voltage attempts to exceed the voltage setting,
the output voltage is then regulated to the set value and the output current decreases.
This is the automatic crossover to constant–voltage mode of operation.
3.4.3 Adjustment of Constant–Voltage Operation
Follow these steps to set the power supply for constant–voltage mode of operation:
1. Turn the front panel POWER switch to the ON position and the OUTPUT switch to
the OFF position.
2. Press in the V/I PREVIEW switch to display the programmed setting of the output
voltage and current. Set the displayed values to the desired output voltage and
an output current that would exceed the load current. The current setting must be
greater than the maximum peak current required by the load. If the load current
attempts to exceed the limit value, the power supply will enter the constant–
current mode of operation: The output voltage will decrease and no longer will be
regulated.
3. Turn the front panel OUTPUT switch to the ON position. The VOLTAGE indicator
should be ON and the CURRENT indicator should be OFF.
3.4.4 Adjustment of Constant–Current Operation
Follow these steps to set the power supply for constant–current mode of operation:
1. Turn the front panel POWER switch to the ON position and the OUTPUT switch to
the OFF position.
2. Press in the V/I PREVIEW switch to display the programmed setting of the output
voltage and current. Set the displayed values to the desired output current and
an output voltage that would exceed the maximum compliance voltage required
by the load. The voltage setting must be greater than the maximum peak voltage
required by the load. If the load voltage attempts to exceed the limit value, the
power supply will enter the constant–voltage mode of operation: The output
current will decrease and no longer will be regulated.
3. Turn the front panel OUTPUT switch to the ON position. The CURRENT indicator
should be ON and the VOLTAGE indicator should be OFF.