The role of Auto Range:

AutoRange will calculate the appropriate reference level by itself according to the signal's transmit power; if the Signal trigger mode is used, Auto Range will also calculate the appropriate trigger level to ensure that the instrument captures the complete frame header and ensures the accuracy of the analysis results Secondly, Auto Range will adaptively display the VSA result view (Fit to view) for easy observation.

Auto Range usage scenarios:

It is recommended to use this function first before any test, especially when the tester does not know the DUT's transmit power, it is necessary to click the Auto Range button as shown in the figure below.

Precautions for using Auto Range:

AutoRange's requirements for the input signal gap: Since the VSA MAX IFG (the maximum IFG time supported by Auto Range by default) is 200ms, the DUT transmission interval needs to be less than 200ms by default, otherwise the Auto Range result may be inaccurate; For Auto Range of large IFG signal, VSA MAX IFG needs to be adjusted. For example: when testing the ZigBee module, the IFG of the DUT transmitter is basically greater than 200ms. At this time, you need to modify the default value of VSA MAX IFG before Auto Range is turned on. The modification process is as follows:

Meter (version 2.7.2.37 and above) → Device settings → RF port mode → VSA Max IFG
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