Keysight N5244/45AS Option H85 User's And Service Manual page 40

N5244/45AS Option H85
Example: Making High Power Measurements With Option H85
24.Configure the test setup as shown in
of the amplifier under test to confirm the proper operation of the measurement test setup.
Figure 35 Forward High Power Measurement Configuration
RCVR A IN
CPLR ARM
Fix Attenuator
SOURCE OUT
CPLR THRU
RCVR R1 IN
Booster Amplifier
RF
INPUT
25. Continue with any other high power measurements.
Ratio measurements, such as gain, will be correctly displayed. However, the
NOTE
displayed absolute power levels on the analyzer will not be correct. To correctly
interpret power levels and the gain of the booster amplifier, the attenuator setting
must be taken into consideration.
If no calibration has been performed or if the instrument is in an un-calibrated state, the
following must be taken into consideration when interpreting the measured data:
• The value of attenuation added to receiver A and B.
• The R channel reference level supplied from the coupler arm of the 20 dB coupler.
This procedure can be repeated to setup the reverse high power configuration.
36
Figure
Fix
Attenuator
RF
OUTPUT
Coupler
Arm
20 dB
Coupler Coupler
Main Output
35. Turn On the DUT and measure the S21 gain
DUT
Out
N5245-90002 User's and Service Guide
RCVR B IN
CPLR ARM
Fix Attenuator
SOURCE OUT
CPLR THRU
In
Isolator