Operation and Application
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Voltage and frequency affect each other, as shown above, different colorful lines
represent different frequency bands, and different frequency affect the maximum
output voltage. For example, when the frequency is 2.4kHz, the maximum output
voltage can only be within 216.1V. The voltage and current will be limited by the
total power.
And at different frequency, the output current is also limited by the voltage due
to the minimum load resistance. For example, when frequency is 1kHz,
minimum voltage of 30V or more is required for 100% current output.
4.6 Current Limit Mode and Power Limit Mode
The IT7800 series power supply defaults to constant voltage CV output mode.
The output voltage can be set in main interface.
When the actual current value is higher than the setting current limit value,
power supply works in current limit mode, and output voltage will be reduce.
When the actual power value is higher than the setting power limit value, power
supply works in power limit mode, and output voltage and current will be adjust.
The current limit value can be set in the Protection menu. Refer to 5.5 Protection
Function for detailed setting methods.
4.7 Sweep Function
The Sweep function is used to test efficiency of switching power supply and
capture the voltage and frequency at the maximum power point. The voltage
and frequency of power may be altered in the form of step ladder by setting the
initial voltage, final voltage, step voltage, initial frequency, final frequency, step
frequency and one-step time. As the test closes, voltage and frequency at the
maximum power point may be displayed. Sweep function is not applicable under
DC mode and ACDC mode.
The Sweep function is not supported in multi-channel mode.
Operating steps
1.
Press
[Shift] + [F-set]
（
Sweep
）
on the front panel to enter the sweep
interface, as shown in the figure below.
