Agilent Technologies 8590L Service Manual page 133

Making Adjustments
20. Checking the External ALC for Option 010 or 011
17.Convert the ALC voltage recorded in the previous step to dBv using
the following equation.
ALC Voltage in dBv = ______________20 log (V)
The calculated ALC voltage, in dBV, should be ≥−0.75 dBV and
≤+0.75 dBV.
18.Adjust the SRC PWR to −34 dBV using the front-panel knob.
(Display reads −34 dBm.)
19.Note the voltage on the DMM. Wait until the reading stabilizes
before recording it in the space provided. This is the error at a source
power of −34 dBV.
ALC voltage at -34 dBV = ______________volts dc
20.Convert the ALC voltage recorded in the previous step using the
following equation.
ALC voltage in fBV = 20 log (V)
The calculated ALC voltage, in dBV, should be greater than or equal
to −34.75 dBV and less than or equal to −33.25 dBV.
134 Chapter 2