/// VIBRATION TESTING \\\
Software features stepped sine measurements
The latest software release for SignalCalc signal analysers and controllers features the latest generation of stepped sine
Stepped sine analysis included in the latest SignalCalc 900 software
analysers and controllers now features the latest generation of stepped sine, as well as numerous new features and improvements, including being easier to use. Stepped sine measurement can be pro-
T
grammed to operate in an open or closed loop. In open loop, the system excites the structure by sending a constant sine output from the internal signal generator. Whereas in closed loop, the system controls to a con-
16 /// Climatic & Vibration Testing \\\ 2022
he recently released Version 1.6 soft- ware from Data Physics for the com- pany’s SignalCalc 900 Series signal
stant level from a specific input channel. It is common in stepped sine measure-
ments to break the measurement into a se- ries of bands, each with its own setup. It is possible to select finer resolution in areas of particular interest, boost the source level where the system response is known to be low, just move more slowly near resonances, or control to a constant input channel level.
Stepped sine analysis /// Stepped sine testing measures system fre-
quency responses under particularly chal-
lenging conditions when the system under test exhibits an enormous dynamic range or the signal-to-noise ratios are poor or when the system must be measured while operating or when non-linearities compli- cate the picture. These are the areas where stepped sine becomes the most appropri- ate method. In a stepped sine test, the analyser directs
an internal signal generator to create a steady sine wave at one frequency and the system response is measured just at that frequency. The data point is stored, the signal generator
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