RIGOL DSA1030 - Manual (Page 25)

RIGOL
Quick Guide for DSA1000 Series 11
Figure 8 TRIGGER IN connection
4. 10 MHz IN/OUT
The BNC input or output of the 10 MHz reference clock, see figure below.
Figure 9 10 MHz IN/OUT connection
5. VGA port
This port provides a VGA signal output which is used through a VGA cable,
see figure below.