Calc supports combining measurements over time allows visualization of certain aspects of the input signal or hiding of unwanted signals. All calculations can be reset by selecting the calculation mode again.
- OFF disables any calculation
- MIN HOLD sets the display to hold the minimum value measured. Reset the hold by selecting again. This setting is used to see stable signals that are within the noise
- MAX HOLD sets the display to hold the maximum value measured. Reset the hold by selecting again. This setting can be used for many measurements such as showing the power envelope of a modulated signal.
- MAX DECAY sets the display to hold the maximum value measured for a certain amount of scans after which the maximum will start to decay. The default number of scans to hold is 20. This default can be changed in the SETTINGS menu. This setting is used instead of MAX HOLD to reduce the impact of spurious signals
- AVER 4 sets the averaging to new_measurement = old_measurement*3/4+measured_value/4. By default the averaging is linear power averaging
- AVER 16 sets the averaging to new_measurement = old_measurement*15/16+measured_value/16. By default the averaging is linear power averaging
- AVER Does forever averaging. To restart, activate again. By default the averaging is linear power averaging
- QUASI PEAK sets a quasi peak hold mode
- TRACE->TinySA4/TABLE? support defining a static reference, limit or level correction trace
- BACK moves back to the trace menu
As there is no VBW setting for noise reduction, it is advised to use averaging instead.
The above picture shows the power enveloppe of a mobile phone base station that transmits between 945MHz and 955MHz. The yellow trace is set to max hold and the red trace shows the current transmit power.
