HP 8560A Service Manual page 65

7. Reduce the input power by 40 dB, to -58 dBm ( use an attenuator or a source with a
good relative amplitude accuracy).
8. If the signal is lower on the screen than expected (delta marker reads a change of greater
than 40 dB, such as -4ldB) then adjust A4R544 ( see Figure 2-7) for an even lower level
and press
the adjustment.
9. If the signal is higher on the screen than expected (delta marker reads a change of less
than 40 dB, such as reads -39 dB) then adjust A4R544 for an even higher level signal and
press
adjustment.
10. Repeat the adjustment and adjust current state until the delta marker reads -40 dB
Allow sufficient time for the analyzer to complete
. Allow sufficient time for the analyzer to complete the
5. DC Log Amplifier Adjustments
Adjustment Procedures 2-31