Tektronix 1720

Operating Instructions
1720/1721
2–13
1720/1721 (rear)
Color bar signal
Black burst
75W Termination
1410–Series (rear)
Figure 2-7: Connection for using black burst signal for External Reference.
Push the REF button and check that the front-panel EXT indicator lights. Check
for a stable display of vectors (CH-A INPUT).
Push and hold the REF button until the front-panel TEST indicator lights.
Check for a test circle display. See Figure 2-8.
Leave the 1720/1721 REF in TEST.