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Patient Reported Outcome Data on switch from standard to extended half life in Irish adults with haemophilia. Publication of has been archived on our website. Visit our publications for new and future releases! The Probe Check is a powerful tool to give insight into the operation of the instrument. If you are running into a problem with your velocimeter, running a probe check should be the first troubleshooting step. Note that the probe check data is only useful if it is collected while the probe is submerged. Before presenting different examples, here is a short description of how to run the probe check and where you can find the data afterwards:.
Note that when recording to disk, the data will be in binary mode.
The format is described in the System Integrator Manual. Look in the directory where your data file is located, and after conversion you will see a few additional files have been created. The figures below show Probe Check displays resulting from different problems.
These probe checks are from a Vectrino, but the same effects are in most cases valid for the Vectrino Profiler and the Vector as well.
If there are any specific differences, they will be mentioned. The first two images show a probe check presenting the result of what we want to see, from a Vectrino and a Vectrino Profiler respectively. Below is a presentation of the most common problems, together with our suggestions on how to improve the result of the check, if it is not related to a damaged probe. If you have older data files with good scattering conditions, this should come in handy.
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If not, use the examples above. Suggestion: Try using a deeper bucket. Multiple echoes from the bottom reflecting off the surface can also appear in the probe check data. These will typically be at roughly integer multiples of the actual distance to the bottom. Depending on the acoustic path length, an echo closer to the actual boundary position may be the result.
The Probe - Wikipedia
If you see interference in beam 3 and beam 4, try moving the probe upwards a bit in the water column. If the scattering level is sufficient, increase the output power.
- Using the Probe Tool.
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In the figure below, the red and blue curves representing beam 1 and beam 2 are not aligned with the other two curves. In this case, beam 2 was bent a bit out, beam 1 a bit in.
Check to confirm: Gently place the probe on a flat surface and confirm that all beams touch the surface at the same time. A bent receiver arm will change the calibration since the receiver arm geometry has changed.
If there are only minor changes, then you may not notice much difference, but it will introduce a bias to the measurements. Contact Nortek for further guidance. Switch to Finland. Before you perform a near-field analysis,you first need to know how the E and H fields are distributed.
The magnetic field probes include special electrically shielded probe tips. The various probe tip shapes are designed for tasks in near-field measurements. The upper limit frequency of a probe is determined by the size and design of the probe tip.
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