Agilent Technologies HP 8719D Service Manual page 230

Check Al4 Fractional-N Checks With ABUS
(SYSTEM) .sEvIcE !!F!! llgFM,OG f)lus...~N IMEAS) %wO~ fN h&x m?
Figure 7-3.. ""
Figure 7-3. Fractional-N Tuning Voltage Waveform at Abus Node 21
frequencies of column one in 'Ibble 7-l.
Front Panel
Displayed Counter Value
50 MHz
match 'lhble 7-1, Al4 or the pulse generator may be at fault.
Source Troubleshooting