Can someone provide insight on how the 'cross channel spectrum (ODS)' measurements in vb8 correspond to the options in MEscope? I initially thought it was similar to 'transmissibility', involving comparing magnitude and phase differences between a reference location and multiple test locations. However, the trace table in MEscope also includes options like 'ODS FRF', which may be more accurate. It is puzzling how comparing locations with a cross channel measurement can be considered a Frequency Response Function (FRF) since there is no direct input-output relationship. I am seeking guidance on selecting the most appropriate measurement type for my ODS data import. Thank you, Gary.
Hey Gary, I may have misunderstood your question, but there is a feature labeled 'cross spectrum' available in the ME'Scope trace window. If you're looking to bring in ODS phase and magnitude data from a single frequency, you can achieve this by using a shape table instead of a trace. I hope this information is beneficial to you! Best regards, Gerard.
I ultimately decided to utilize a shape table due to the lack of enabled cross-channel spectrum for ODS on my older VB7 instrument, which does not have a USB port for downloading UFF data. Despite having to manually input the data, the shape table worked effectively. Regards, Gary.
Hey Gary, you're on the right track differentiating between transmissibility and FRFs; they are indeed different concepts. The 'cross channel spectrum' measurements in vb8 can be paralleled to 'ODS FRF' in MEscope rather than 'transmissibility'. While they may seem similar, an ODS FRF is a set of frequency response functions that includes forces. These forces aren't usually measured, but they can be synthesized from the response measurements. In contrast, 'transmissibility' simply refers to the comparison of output to the input, which is signal derived. When exporting your ODS data, you'd want to stick with an output that represents the FRF measurement for each DOF, as it contains more comprehensive information. Transmissibility should only be the choice if you don't intend to include force as part of your data. I hope this helps!
Hey Gary, your query about the correlation between the 'cross-channel spectrum' in vb8 and options in MEscope is quite insightful. The ODS FRF feature you identified in MEscope is indeed a form of frequency response measurement, but it manifests slightly differently than traditional transmissibility. It works to capture dynamic characteristics, associating motions at different points or in different directions, without needing to have a clearly determined input-output relation as in conventional FRF. As for choosing the most suitable method, I would suggest that depends mostly on your test conditions, the type of information you want to extract, and the complexity of the system you're studying. If you're dealing with multiple test locations without well-defined inputs, using ODS FRF might just be a wise way to go.
Hi Gary, you're on the right track thinking about the correspondence between vb8 and MEscope. Indeed, 'transmissibility' would be similar to a cross-channel measurement, as it is a comparison between a reference and test points. Regarding 'ODS FRF', it might seem confusing, but think of it as an extension of regular FRF that includes motion influence. So, while there isn't a direct input-output relationship, it gives a broader picture of your structure's behavior by compiling the responses from multiple channels (as opposed to a single point for a regular FRF). So choosing between these depends on the specifics of your setup - if you want a full overview with more detailed response, 'ODS FRF' could give you that. But for a simpler comparison between two locations, 'transmissibility' might suffice. Good luck with your data import!
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Answer: - The cross channel spectrum measurements in VB8 involve comparing magnitude and phase differences between a reference location and multiple test locations, whereas options like 'transmissibility' and 'ODS FRF' in MEscope may offer different analysis approaches.
Answer: - The term 'ODS FRF' in MEscope may provide more accurate results for Frequency Response Function analysis, even when comparing locations without a direct input-output relationship.
Answer: - When selecting a measurement type for ODS data import, consider the specific analysis requirements and the capabilities of each measurement option available in the software tools being used.
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