Microlog dBX order tracking considerations when using TCT.dBX or Data Bridge

Summary

The Microlog dBX CMVA 90 Data Collector module collects all data at a fixed frequency of 40 kHz, corresponding to a sampling rate of 102.4 kHz. This causes an issue when collecting ordered tracked spectra.

In the previous generation of Microlog (CMXA series), the sampling rate for order tracked Points is adjusted according to the measured speed. For example, a 10th-order Point measured at 45 Hz corresponds to a frequency range of 450 Hz.

Due to the fixed sampling rate in the Microlog dBX, it is not possible to achieve precisely these results.

Solution

The minimum number of orders that can be collected in the Microlog dBX is 100, although values of 200, 400, and 800 are also possible. Additionally, we can program a separate variable to control the number of orders displayed in the dBX when capturing data. This is achieved by truncating the resulting order spectrum. Consequently, due to data limitations, the communications library adjusts the requested resolution to maintain the desired number of lines in the result. 

When uploading data, the library is presented with the full order spectrum captured. However, it must truncate this data to match the Point setup. This creates an issue because both @ptitude Analyst and @ptitude Observer require spectra to be displayed in standard number of lines (100, 200, 400 etc.).

In most cases, if we truncate the full order spectrum to the requested number of orders, it will not be compatible with one of the standard spectrum lengths. To enable uploading to the host software, we must modify the truncation so that it includes at least the required number of orders and also fits within a standard spectrum length.

The result of this modification is that the order spectrum displayed in @ptitude Analyst or @ptitude Observer will not match the number of orders shown on the Microlog dBX screen, but rather a close approximation.
For instance, when uploading data from a 10 order Point, the resulting spectrum might appear as 10.5 orders. (The actual value depends on the specific Point setup and measured speed).

In some instances, particularly when collecting data with fewer than 5 orders, the uploaded spectrum may actually contain fewer orders than were originally requested.

Contacting SKF Technical Support Group

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