Agilent Technologies 8753ES Option 011 Service Manual page 322

Service Key Menus and Error Messages
Service Key Menus
Node 16 1V/GHz (source oscillator tuning voltage)
Perform step A11 and then press
ANALOG IN
Meas 16 x1 Scale Ref
.
AUTO SCALE
This node displays the tuning voltage ramp used to tune the source oscillator. You should
see a voltage ramp like the one shown in Figure 10-11. If this waveform is correct, you can
be confident that the A11 phase lock assembly, the A3 source assembly, the A13/A14
fractional-N assemblies, and the A7 pulse generator are working correctly and the
instrument is phase locked. If you see anything else, refer to the Chapter 7 , "Source
Troubleshooting."
Figure 10-11 Analog Bus Node 16
10-32 Chapter 10