Agilent Technologies 8753ET User Manual page 74

Making Measurements
Measuring Amplifiers
COUPLED CH ON
Sweep Setup
13. To place the marker exactly on a measurement point, press:
Marker Fctn MARKER MODE MENU
14. To set the CW frequency before going into the power sweep mode, press:
Seq SPECIAL FUNCTIONS
15. Press
Sweep Setup
If interpolation is on (the default setting), the calibration will be applied to the power sweep.
16. Enter the start and stop power levels for the sweep.
Now channel 1 is displaying a gain compression curve. (Do not pay attention to channel 2 at this time.)
17. Press
Chan 2 Display
18. If
D2/D1 to D2 ON
19. Press
Meas INPUT PORTS
Now channel 2 displays absolute output power (in dBm) as a function of power input.
20. Press
Scale Ref SCALE/DIV
21. Press
Chan 1 1
NOTE A receiver calibration will improve the accuracy of this measurement. Refer to
"Calibrating for Increased Measurement Accuracy."
22. Press
Marker Fctn
23. To find the 1 dB compression point on channel 1, press:
Marker Search SEARCH:MAX
SEARCH:TARGET
Notice that the marker on channel 2 tracked the marker on channel 1.
24. Press
Chan 2 Marker
25. To take the channel 2 marker out of the  mode so that it reads the absolute output power of the
amplifier (in dBm), press:
 MODE MENU
Marker
1-60
MARKER CW
SWEEP TYPE MENU
DUAL | QUAD SETUP
was selected, press
MORE
.
B
10 x1
to change the scale of channel 1 to 1 dB per division.
x1
MARKER MODE MENU
Marker
1
x1
MKR MODE MENU
 MODE OFF
MARKERS:DISCRETE
POWER SWEEP
DUAL CHANNEL ON
D2/D1 to D2 OFF
to change the scale of channel 2 to 10 dB per division.
MARKERS:COUPLED
MKR ZERO Marker Search
MARKERS:UNCOUPLED
.
.
.
Chapter 6 ,
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