FAQs from Rohde & Schwarz

EMC32, Finals Adjustments of Turntable in EMI Auto Test does not work in limited range

Description

Using my Turntable the Final Adjustment works on full range (from -180 to +180°) , also if I have defined a "predefined range" of 60°-

Resolution

This may happen and this function is intended. For better understanding, here some background information:

1. The turntable range from -180 to +180 deg does not support any additional range, e.g. -210 to + 210.
2. For example, assume our critical frequency from preview or zoom measurement is found @ -160 deg.
3. If you have set a search range of 60 deg, thus software needs to search from -160 deg - 30 deg = -190 deg to -160 + 30 deg = -130 deg.
4. Since the min angle is set to -180 the adjustment algorithm needs to measure in the ranges -180 deg to -130 deg and 170 deg to 180 deg to cover this search range.
5. Since it would take more time to stop the measurement at -130 deg, move to 170 deg and restart the measurement for only 10 deg it is hard coded that in this case we do a full range measurement. --> this has no disadvantages for the result.

There is a solution for you to avoid this.

a) Activate the "range clippling" here in the accessories settings. --> search range is reduced
b) extend the turntable range for additional 30 deg on both sides if the Hardware is capable to do this.

EMC32, Finals Adjustments of Turntable in EMI Auto Test does not work in limited range