GW Instek GDB-03 - Manual (Page 5)

GETTING STARTED
3
The 2 channel and 4 channel models differ in the position of the
horizontal controls, the math, reference and bus keys as well as the
position of the EXT trigger.
2-Channel model 4-Channel model
CH1
input
CH2
input
CH3
input
CH4
input
Horizontal
controls
Math, Reference
Bus keys