RadiMation Application Note 106

Powermeter parameter configuration

This application note describes how the measurement parameters of a Powermeter can be configured to get a fast and stable power measurement.

Each powermeter in RadiMation^® has a powermeter configuration tab in the device drivers. In this tab, the accuracy of power measurement can be optimized. This function allows to make multiple measurements, and wait until the value is stable. Using a measurement-loop.

Pre Wait Time

Wait time before starting the measurement-loop. Can be used to wait for a signal generator, and or amplifier to stabalize.

Measure

The minimum ammount of measurements in the measure loop. Continues to loop even if power level is stable.

Wait Time

The wait time before each measurement is taken, during the measurement-loop.

Max. Difference

If the measured power between each measurement in the measurement-loop, is less than this value. The measured power is stable. The loop will stop.

Max. Measure

The maximum ammount of measure times, for the measurement-loop

As can be seen on the screenshot. Both leveling, and monitoring settings can be set. The leveling is used, whenever RadiMation is measuring the power, to regulate the signal generator. For example, if you have a immunity power closed loop method. This will regulate the signal generator until certain power is measured. In this case, the leveling settings are used. If the powermeter is used as input. For example in the immunity multiband test, in the inputs table. Then the monitoring settings are used.

Example

See the measured power graph above. Each dot, is 1 measurement. In this case, you could set the measure time to 4, and maximum measure time to 10. The diference can be set to the highest(green) point and one previous point(orange). In this case, RadiMation will use the first(green) point, where the difference less than the allowed difference. The value of the green point will be used.

Warning:

With the available settings, you can make measurements very slow. In some cases, you can end up in measuring noise. Then the maximum measure times will be used. You may need to decrease the Max. Measure value in that case.

The ability of an EUT to be immune to incoming electromagnetic interference. This is equivalent to the term susceptibility that is used by some standards.