HP 8559A Operation And Service Manual page 205

5-22. 3 dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX lgO9A) (Cont'd)
Compare new frequency with frequency recorded in step 20. The difference between the two frequencies
should be 9.000 kHz to 11.000 kHz.
widths within limits; however, the final measurement of the 3 kHz bandwidth
must be between 2700 Hz and 3300 Hz. (If the 10 kHz bandwidth cannot be
brought within limits by adjustment of A9R72 XTL, change the value of fac-
tory-selected resistor A9R78*.)
Set RESOLUTION BW to 1 kHz. n n e signal generator to peak signal on oscilloscope display.
Adjust REF LEVEL FINE to place signal at 7.1 divisions. Record counter frequency.
Increase signal generator frequency until signal on oscilloscope display drops to the fifth graticule line.
Record new counter frequency.
The difference between the two frequencies recorded in steps 24 and 25 should be 450 Hz to 550 Hz.
Reconnect AlOWl to A5J2.
ADJUSTMENTS
NOTE
MHz
MHz