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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:
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:
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 1-19.
2. Press to divide the data by the memory.
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 1-19.
2. Press to subtract the memory from the measurement data.
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 to uncouple the channels.
2. Make sure that both channels must have the same number of points.
3. Press to ratio channels 1 and 2, and put the
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 for the procedure to identify the
1 dB compression point.
Display
MEMORY
Display
DATA and MEMORY
Display
DATA/MEM
Display
DATA-MEM
Sweep Setup
COUPLED CH OFF
Display
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D2/D1 TO D2 ON