I am building my own Dynamic balancing rig and trying to select appropriate accelerometers.
Sensitivity listings seem to be given in either mV/g (milivolts per g), LSB/g (least significant bit/g), counts/g, or mg/digit.
The only one I understand is mV/g. Would appreciate help deciphering the others and how they relate in terms of mV/g.
Thanks in advance.

 

Hi Karl,
Is this helpful.?
http://www.unit-conversion.info/acceleration.html

also
https://www.google.co.uk/url?sa=t&r...-05_comp.pdf&usg=AOvVaw29RRRx2hGG6gYzwr8Ggmiq
E

 

I appreciate your feedback, and is helpful information, but my issue is not with comprehending data output. rather it is in being able to choose a device of sufficient high sensitivity for my application when the manufacturers specs are not given in consistent units.

 

... when the manufacturers specs are not given in consistent units.

Can you give us an example data sheet?

 

I appreciate your feedback, and is helpful information, but my issue is not with comprehending data output. rather it is in being able to choose a device of sufficient high sensitivity for my application when the manufacturers specs are not given in consistent units.

It should not be that hard to make a spreadsheet that converts the other units into whichever you prefer and lets you compare them.

 

Practical understanding of key accelerometer specifications is a pretty good read on the subject. The latter specifications you mention, LSB/g (least significant bit/g), counts/g, and mg/digit it would appear would apply to an accelerometer read device or accelerometer which has a built in amplifier and some sort of digital output. When choosing an accelerometer for a specific task, such as a dynamic balancing machine, your concerns would be Sensitivity as expressed in mV/G, Frequency Response and the other parameters mentioned in the link. If you could provide a link to some of the parameters you mentioned being used it would help considerably.

Over the years I used primarily Endevco (now a division of Meggit) and B&K (BRÜEL & KJÆR) each offers very good engineering support and applications engineers only a phone call away. I used the Endevco stuff quite a bit and found their applications engineers to be very helpful when I had questions. There were occasions when I didn't know what I wanted or needed and they told me what I wanted and needed. Again, I see accelerometers as in their basic form an analog device so less a display terms like LSB should not apply. Now with a digital out charge amplifier I can see LSB but not as to a raw accelerometer output.

Ron

 

Practical understanding of key accelerometer specifications is a pretty good read on the subject. The latter specifications you mention, LSB/g (least significant bit/g), counts/g, and mg/digit it would appear would apply to an accelerometer read device or accelerometer which has a built in amplifier and some sort of digital output. When choosing an accelerometer for a specific task, such as a dynamic balancing machine, your concerns would be Sensitivity as expressed in mV/G, Frequency Response and the other parameters mentioned in the link. If you could provide a link to some of the parameters you mentioned being used it would help considerably.

Over the years I used primarily Endevco (now a division of Meggit) and B&K (BRÜEL & KJÆR) each offers very good engineering support and applications engineers only a phone call away. I used the Endevco stuff quite a bit and found their applications engineers to be very helpful when I had questions. There were occasions when I didn't know what I wanted or needed and they told me what I wanted and needed. Again, I see accelerometers as in their basic form an analog device so less a display terms like LSB should not apply. Now with a digital out charge amplifier I can see LSB but not as to a raw accelerometer output.

Ron

Thank you, this information is most helpful and has led to the understanding I was seeking. Seems I was comparing apples with oranges as it were - analogue output against digital. I have a good understanding of the other selection criteria for accelerometers, it was just the sensitivity I was stuck on. As I intend to monitor vibration (in an industrial setting) to a resolution in the order of 0.1 mm/sec, I was quite focussed on high sensitivity but could not understand some of what was being presented. As it is analog output I require, of which I have adequate understanding, I can now make an informed choice of device. Again, thank you.

 

Hi Karl,
Is this helpful.?
http://www.unit-conversion.info/acceleration.html

also
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwjFqd6M-b3YAhXPJVAKHf0EDiAQFgg8MAM&url=http://www.mfpt.org/PDFs/MFPT%2059%20%20ACCELERATION%20MEASUREMENTS%20SESSION%204-19-05_comp.pdf&usg=AOvVaw29RRRx2hGG6gYzwr8Ggmiq
E

Tuns out that the second link in your reply answered some other questions I did not even know I had yet, so thank you.