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Prosig Support Blog

The place to come for support for Prosig's DATS, P8000 & PROTOR products

Prosig Support Blog
3397class="post-3397 post type-post status-publish format-standard hentry category-dats category-signal-processing category-tutorial tag-alias tag-anti-alias tag-anti-aliasing tag-iso2631 tag-iso8041 tag-measurement tag-sample-rate tag-vibration tag-whole-body"

What Sample Rate Do I Use To Measure Whole Body Vibration?

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What sample rate should I use if I am measuring whole body vibration?

Strict ISO8041 compliance imposes a minimum sample rate of 900 samples per second. This ensures the amplitude and phase characteristics of the applied weightings meet the required criteria. To take account of the anti alias hardware filter we would recommend 1200 samples/second. If non-strict compliance is used the minimum sample rate is 300 samples/second.

ISO2631-1 recommends a minimum data duration of 227 seconds. However, for greater reliability, 600 seconds is now considered essential. That is, a 600 second or longer signal will be more representative and will provide better quality results.

Dr Mike DoneganAdd a Comment3277class="post-3277 post type-post status-publish format-standard hentry category-dats category-signal-processing category-tutorial tag-background-noise tag-gaussian tag-measure tag-measurement tag-noise tag-random tag-sine-wave tag-spectra tag-spectrum tag-spectrum-level tag-vibration"

Relative signal levels of a sinusoid with and without background noise

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In the process of looking at some order data, a question about the accuracy of the measurement of the signal level of discrete frequency signals which were close to the general noise level.  To answer this question, a small DATS worksheet was created which generated 2 signals.  The first signal was a 35 Hz sinusoid which, by itself the spectrum level was measured to be approximately -9 dB (ref 1 V) as seen in Figure 1.

Spectrum level of 35Hz sinusoid
Fig 1: Spectrum level of 35Hz sinusoid

Continue reading Relative signal levels of a sinusoid with and without background noise

John MatheyAdd a Comment3311class="post-3311 post type-post status-publish format-standard hentry category-dats category-p8000 tag-eddy-current-probe tag-electrical-runout tag-lvdt tag-measurement tag-proximity-probe tag-rotor-runout tag-runout tag-total-runout tag-turbine"

What sensors are required to perform a Rotor Runout Measurement?

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The DATS Rotor Runout Measurement package can be used on any shaft where the following probes are available…

  1. A LVDT (Linear Variable Differential Transformer) probe. This is basically a contact probe. This will allow the measurement of the shaft total runout*.
  2. If an electrical runout measurement is also required then an additional eddy current probe (also known as a proximity probe) is needed. This is a non contact probe and can be used in conjunction with the LVDT to measure the electrical runout only.
  3. A once per revolution tachometer is also required. This could be optical, proximity, magnetic and so on.

With these three sensors it is possible using the DATS Rotor Runout Measurement package to find both electrical and mechanical runout.

* Total runout is a composite tolerance including the effects of cylindricity and concentricity, co-axiality, straightness and parallelism along the axis.

James WrenAdd a Comment3305class="post-3305 post type-post status-publish format-video hentry category-dats category-tutorial category-video tag-acoustics tag-analysis tag-cursors tag-measurement tag-noise tag-sound tag-vibration tag-video post_format-post-format-video"

[Video] Using reference cursors to measure data

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A tutorial by James Wren (Prosig UK) on how to use the reference cursors in the DATS software to precisely measure features in your data.

James WrenAdd a Comment3242class="post-3242 post type-post status-publish format-video hentry category-p8000 category-tutorial category-video tag-calibrate tag-calibration tag-measurement tag-prosig tag-strain tag-strain-gauge tag-test tag-video post_format-post-format-video"

[Video] Calibrating a strain gauge for use with a Prosig P8000 system

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James Wren (Prosig UK) steps through how to calibrate a strain gauge for use with a Prosig P8000 system.

 

James WrenAdd a Comment3226class="post-3226 post type-post status-publish format-video hentry category-p8000 category-tutorial category-video tag-acquisition-software tag-can-bus tag-measurement tag-measurement-setup tag-noise tag-p8000 tag-vibration post_format-post-format-video"

[Video] A simple CAN-bus measurement setup

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A simple tutorial that explains how to use the DATS Acquisition software to set up a Prosig P8000 to capture data from a CAN-bus.

James WrenAdd a Comment2968class="post-2968 post type-post status-publish format-standard hentry category-dats category-tutorial tag-accelerometer tag-accelerometers tag-angles tag-balance tag-balancing tag-centre-of-gravity tag-measurement tag-multi-plane-balancing tag-sensors tag-shaft-balancing tag-shaft-bearing tag-speed-range tag-tachometer tag-vertical-planes tag-vibration tag-vibrations"

How do I balance a shaft?

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“How do I balance a shaft?” seems like a fairly straightforward question, but there are a number of things that we need to understand first. Here we look at a number of key concepts that need to be understood in order perform balancing.

What does balance mean?

Well broadly speaking to balance a shaft, mass must be added or removed at certain angles. The concept being that the centre of gravity and rotational centre of the shaft will be equal when the shaft is balanced. Continue reading How do I balance a shaft?

James Wren1 Comment3107class="post-3107 post type-post status-publish format-video hentry category-tutorial category-video tag-brake-discs tag-brake-testing tag-brakes tag-braking tag-dtv tag-measurement tag-noise tag-runout tag-vibration tag-video post_format-post-format-video"

[Video] Brake Runout & DTV Measurement

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James WrenAdd a Comment2851class="post-2851 post type-post status-publish format-video hentry category-p8000 category-tutorial category-video tag-can-bus tag-canbus tag-capture tag-gps-card tag-measurement tag-p8000 tag-recording tag-video post_format-post-format-video"

[Video] Setting up a P8000 system to capture CAN-bus data

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The P8012, P8020 & P8048 can all be fitted with the 8440 CAN-bus/GPS card. Setting up the P8000 to capture CAN-bus data is extremely simple. In the following video, James Wren demonstrates how it is done.

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