User`s guide

94 Agilent X-Series Signal Generators User’s Guide
Optimizing Performance
Using the Power Meter Servo
Using the Power Meter Servo
The Power Meter Servo mode uses power meter readings to adjust the output power of the source,
maintaining a constant DUT output power.
The servo loop measures the output power of the DUT, compares it to the user- provided reference
power, and adjusts the output of the source to achieve the user- provided power level within the
settling error. The servo loop will abort after twenty unsuccessful attempts to achieve the
user- provided power level.
Figure 5-14 Power Meter Servo Menus
For details on each key, use key help as
described on see page 44.
See page 88
Sets the allowed
settling error.
The system automatically adjusts
power level according to the power
meter reading.
Once performs the adjustment only at
the end of any transition (amplitude or
frequency change). After the
adjustment is performed and the
power error is corrected, no further
adjustments are performed until the
next transition.
Continuous performs the adjustment
as in Once mode, and continues to
adjust the power periodically if the
value differs by more than the
specified Settling Error.
N5173B/83B only
N5173B/83B
only
Sets the relative initial power
when leveling with the Power
Meter Servo mode. The
default of 0 dB means that the
system starts with the power
it thinks is needed (based on
output power, offset and
reference) but this might lead
to power overshoots in certain
cases (especially when the
offset is not set up correctly).
This value allows to specify
an additional safe-margin to
start the measure/adjust
cycles lower than the target
power to protect the device
from power overshoots.