1-20
Making Measurements
Using Display Functions
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 S ubt ra ct t he Mem ory Trace fr om 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 1-58 for the procedure to identify the 1 dB compression
point.
Blanking the Display
Pressing switches off the analyzer display while
leaving the instrument in its current measurement state. This feature may be helpful in prolonging the life of
the LCD in applications where the analyzer is left unattended (such as in an automated test system). Turning
the front panel knob or pressing any front panel key will restore normal display operation.
Pressing will blank the displayed frequency notation for security
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