Agilent Technologies 8719ES User Manual page 34

Making Measurements
Using Display Functions
To View the Measurement Data and Memory Trace
The analyzer default setting shows you the current measurement data for the active
channel.
1. To view a data trace that you have already stored to the active channel memory, press:
Display MEMORY
This is the only memory display mode where you can change the smoothing and gating
of the memory trace.
2. To view both the memory trace and the current measurement data trace, press:
DATA and MEMORY
Display
To Divide Measurement Data by the Memory Trace
You can use this feature for ratio comparison of two traces, for example, measurements of
gain or attenuation.
1. You must have already stored a data trace to the active channel memory, as described in
"To Save a Data Trace to the Display Memory" on page
2. Press
DATA/MEM
Display
The analyzer normalizes the data to the memory, and shows the results.
To Subtract the Memory Trace from the Measurement Data Trace
You can use this feature for storing a measured vector error, for example, directivity. Then,
you can later subtract it from the device measurement.
1. You must have already stored a data trace to the active channel memory, as described in
"To Save a Data Trace to the Display Memory" on page
2. Press
DATA-MEM
Display
The analyzer performs a vector subtraction on the complex data.
To Ratio Measurements in Channel 1 and 2
You may want to use this feature when making amplifier measurements to produce a trace
that represents gain compression. For example, with the channels uncoupled, you can
increase the power for channel 2 while channel 1 remains unchanged. This will allow you
to observe the gain compression on channel 2.
1. Press
Sweep Setup
2. Make sure that both channels must have the same number of points.
3. Press
MORE
Display
results in the channel 2 data array. This ratio is applied to the complex data.
4. Refer to "Measuring Gain Compression" on page 1-53
1 dB compression point.
1-20
to divide the data by the memory.
to subtract the memory from the measurement data.
COUPLED CH OFF
D2/D1 TO D2 ON
1-19.
1-19.
to uncouple the channels.
to ratio channels 1 and 2, and put the
for the procedure to identify the