1. Connect the ac dc power supply plug to AC220V: (for some power supplies whose input current exceeds 10A, the input power cord should be handled by the user according to the site, and the cable connector must be crimped to prevent poor contact and ignition)

2. Turn on the ac dc power supply switch;

3. First, adjust the output voltage knob at no-load, observe the output voltage display meter, adjust to the working voltage value, and observe whether there are abnormal noises, ignitions, odors and other abnormal phenomena inside the machine. When the no-load test is completed and normal, only Accessible load.

4. Connect the positive pole of the load to the positive output terminal (red terminal), and the negative pole to the negative terminal of the output (black terminal). If the ammeter exceeds the rated value and the steady current indicator light is on, it means overload or short circuit, and the load should be adjusted to restore the instrument normal.

If it is used as a constant current source, first adjust the voltage regulation knob clockwise to the maximum, and at the same time turn the constant current adjustment knob counterclockwise to the minimum. Then connect the load, and then adjust the steady current adjustment knob clockwise to make the output current reach the required steady current value. At this time, the steady flow indicator light (cc) is on.

5. When ac dc power supply is used as a regulated power supply, the constant current adjustment knob needs to be adjusted to the maximum clockwise, and the current limiting protection point can be arbitrarily set at this time. The setting method is: turn on the power supply, connect an appropriate variable load, and adjust the load resistance so that the output current is equal to the current value of the current limiting protection point. At this time, adjust the steady current adjustment knob respectively so that the steady current indicator is in a critical state, and then adjust the current potentiometer so that the steady current indicator is just off. At this time, the current limit protection point is set. During use, when the load is applied or the load is started, the output voltage drops greatly. It may be that the machine is working in a current-limiting state or the load current exceeds the maximum current that the machine can withstand.