Agilent Technologies HP 8719D Service Manual page 135

5. No adjustment is required when the frequency counter measurement results
are within specification:
n
for HP 8720D
n
for HP 8722D
n
Otherwise, locate the Al2 assembly (red extractors) and adjust the VCXO
ADJ (see Figure 3-9) for a frequency measurement within specif?cations.
Note
To increase the accuracy of this adjustment, the following steps
are recommended.
6. Replace the instrument covers and wait 10 to 16 minutes in order to allow
the analyzer to reach its precise operating temperature.
7. Recheck the CW frequency and adjust if necessary.
vcxo
A D J R e d