Calibration parameter are showed and can be adjusted just when the oscilloscope is connected on the phone.

1. Factory Reset

Set the calibration parameters according the calibration data stored in the oscilloscope (it works just for few models, check this possibility in the oscilloscope specific webpage).

2. Calibrate Zero Level (or Offset)

Allow to set the output to 0V when the probe is connected to its ground. It practically reduce the offset error.

3. Calibrate Multiplier (or Gain)

Allow to reduce the gain error of the oscilloscope, by using an accurate reference voltage.
You can also repeat this procedure with different reference voltages. In this case, for each channel, start from lower reference voltages to higher ones.

First it is necessary to calibrate the Zero Level, then the Multiplier Factor

4. Reset

Reset the calibration data.

5. Load

Load the calibration data from a file.

6. Save

Save the calibration data to a file.

For each channel is possible to calibrate the Zero Level (b) (so that when the probe is connected to the GND the result of the measure is 0 Volts) and the Multiplier factor (m). Assuming the ADC measured values are on a straight line the Multiplier factor allow to adjust the inclination of the ADC line according the equation y=(x+b)m.
First it is necessary to calibrate the Zero Level, then the Multiplier Factor.