Agilent Technologies 8753ES Option 011 Service Manual page 313

Service Key Menus and Error Messages
Service Key Menus
Node 1 Mn Pwr DAC (main power DAC)
Perform step A3 to set up a power sweep on the analog bus. Then press
Meas
.
ANALOG IN 1 x1 Scale Ref AUTO SCALE
Node 1 is the output of the main power DAC. It sets the reference voltage to the ALC loop.
At normal operation, this node should read approximately −4 volts at 0 dBm with a slope of
about −150 mV/dB. This corresponds to approximately 4 volts from −15 to +10 dBm.
Figure 10-3 Analog Bus Node 1
Chapter 10 10-23