HP 8566B Adjustment Manual page 243

11. Down/Up Converter Adjustments
23. Connect the tip of the active probe to A4A4TP7, and adjust
displayed 18.4 MHz and 36.8 MHz signals on the second spectrum
analyzer. The level of the displayed 18.4 MHz signal should be
below -10 dBm.
If A4A6AlC31 has insufficient adjustment range, increase the
location of A4A5RlO. Refer to 'Ikble 3-3 for the acceptable range
of values for A4A5RlO and to lkble 3-4 for HP part numbers.
Adjustments 3-103