RIGOL MSO/DS1000Z Series - Manual (Page 110)

RIGOL Chapter 5 To Trigger the Oscilloscope
5-36 MSO1000Z/DS1000Z User’s Guide
Trigger Level:
When SCL is an analog channel, press SCL and use TRIGGER LEVEL to modify
the trigger level of the SCL channel. When SDA is an analog channel, press SDA and
use TRIGGER LEVEL to modify the trigger level of the SDA channel. For the
details, please refer to the introduction of " Trigger Level".