Agilent Technologies 8719ES User Manual page 68

Making Measurements
Measuring Amplifiers
4. To produce a normalized trace that represents gain compression, perform either step 5
or step 6. (Step 5 uses trace math and step 6 uses uncoupled channels and the display
function
D1/D2 to D2 ON
DATA →MEMORY
5. Press
Display
6. To produce a normalized trace, perform the following steps:
• Press
Display
both channels simultaneously.
• Press
Chan 2
• To uncouple the channel stimulus so that the channel power will be uncoupled,
press:
Sweep Setup
This will allow you to separately increase the power for channel 2 and channel 1, so
that you can observe the gain compression on channel 2 while channel 1 remains
unchanged.
• To display the ratio of channel 2 data to channel 1 data on the channel 2 display,
press:
Chan 2 DISPLAY
This produces a trace that represents gain compression only.
7. Press
Marker MARKER 1
8. Press
Scale Ref
9. Press .
Power
10.Increase the power until you observe approximately 1 dB of compression on channel 2,
using the step keys or the front panel knob.
11.To locate the worst case point on the trace, press:
Marker Search SEARCH:MIN
1-54
.)
DATA/MEM
DUAL | QUAD SETUP
Trans:FWD S21 (B/R)
Meas
COUPLED CH OFF
MORE D2/D1 to D2 ON
and position the marker at approximately mid-span.
to change the scale to 1 dB per division.
SCALE/DIV
x1
to produce a normalized trace.
and select
DUAL CHANNEL ON
or on ET models:
to view
TRANSMISSN