The calibration procedure is very simple and can be done at any time.
The basic principle consists in setting two points – lower and upper. For example, to calibrate the input voltage, it is enough to set two voltages. The low point is about 6 volts and the high point is about 30 or 40 volts.
To calibrate, you need a multimeter that can measure voltage and current. Voltage up to 30 or 50 volts, current up to 5 or 20 amperes, depending on the DPS model. Do not use a load during calibration. The load is your multimeter.
Hope your multimeter is good enogh to work as a reference voltmeter and ampermeter.
Before connecting the multimeter, set the appropriate measurement range. To avoid damage of the multimeter by high current or voltage, connect the multimeter only when the selected item is flashing, and disconnect it immediately after fixing (“Apply” button) the new value.
After entering a new correct value, you must click “Apply” button to fix the value. At this moment, the new calibration value and the current values of the ADC and DAC of the controller are fixed. The fixed value turns blue on the DPS screen.
First, apply a low input voltage to the input of the power supply – about 6 volts.
Click “Start U input Low” button. Set the range of the voltmeter to 20 volts. Connect the voltmeter to the input terminals of your DPS. Enter the value in volts that the voltmeter shows then click “Apply” button to fix it. Unplug the voltmeter.
Next set the range of the voltmeter to 200 volts. Then apply a high input voltage to the input of the power supply – about 30 or 40 or 50 volts. Click “Start U input High” button. Connect the voltmeter to the input terminals of your DPS. Enter the value in volts that the voltmeter shows then click “Apply” button to fix it. Unplug the voltmeter.
Click “Start U output Low” button. Set the range of the voltmeter to 2 volts. Connect the voltmeter to the output terminals of your DPS. Enter the value in volts that the voltmeter shows then click “Apply” button to fix it. Unplug the voltmeter.
Next click “Start U output High” button. Set the range of the voltmeter to 200 volts. Connect the voltmeter to the output terminals of your DPS. Enter the value in volts that the voltmeter shows. Now click “Apply” button. Then, if necessary, the non-linearity compensation process will automatically start, during which you will see the inscription “WAIT”. This may take a few seconds. Unplug the voltmeter.
To calibrate the output current you need an ampermeter.
Set correct range of the current depending on your DPS model.
First set the range of the ampermeter to 2 amps. Click “Start I output Low” button. Connect the ampermeter to the DPS output. Enter the value that the ampermeter shows then click “Apply” button to fix it. Unplug the ampermeter.
Now for the first time for high current select 3A at the left pane (Later you can select others amperage).
Set the range of the ampermeter to 5 or 10 or 20 amps. Click “Start I output High” button. Connect the ampermeter to the DPS output. Enter the value that the ampermeter shows then click “Apply” button to fix it. Unplug the ampermeter.
To complete the calibration and save your changes into the device, click “Save” button.
After changing the firmware, it is necessary to do a full calibration of all parameters.
Later, you can refine the parameters individually by selecting only one or a few menu items.
To increase the accuracy of the calibration, the whole procedure must be repeated 2 or 3 times.