Agilent Technologies HP 8719D Service Manual page 288

switches the counter to monitor the analog bus.
switches the counter to monitor the Al4 fractional-N
VCO frequency at the node shown on the "Overall Block
Diagram, n in the "Start Troubleshooting" chapter.
switches the counter to monitor the Al4 fractional-N VCO
frequency after it has been divided down to 100 kHz for
phase locking the VCO.
1 O-29
Service Key Menus and Error Messages