Legacy Hardware and Apps
DT800 vibration measurement

Good morning Ulusoy,

The accelerometer will need an power supply as per the spec sheet (2 to 10 VDC) . You can the read the output as a Voltage and scale the output to G's.

That is all I can tell you unless you give more details of your project. The speed of sampling will depend on the frequency of vibration you are trying to measure.

Cheers,
Roger

Good morning Ulusoy, The accelerometer will need an power supply as per the spec sheet (2 to 10 VDC) . You can the read the output as a Voltage and scale the output to G's. That is all I can tell you unless you give more details of your project. The speed of sampling will depend on the frequency of vibration you are trying to measure. Cheers, Roger

Hi Roger,

OK, power supply (2 to 10 VDC) connect
Span options what sort to adjust?

I no english

Hi Roger, OK, power supply (2 to 10 VDC) connect Span options what sort to adjust? I no english

Good morning Ulusoy,

The scaling will depend on the model of accelerometer you have purchased. According to the specification sheet these devices output +/- 40 mV full scale.

So if you purchased a 50 G accelerometer then +40 mV = +50 G and -40 mV = -50 G

So your scaling will be:
Lower Physical = -50
Upper Physical = 50
Lower signal = -40
Upper signal = 40
Units = G

Cheers,
Roger

Good morning Ulusoy, The scaling will depend on the model of accelerometer you have purchased. According to the specification sheet these devices output +/- 40 mV full scale. So if you purchased a 50 G accelerometer then +40 mV = +50 G and -40 mV = -50 G So your scaling will be: Lower Physical = -50 Upper Physical = 50 Lower signal = -40 Upper signal = 40 Units = G Cheers, Roger

Hi, Roger,

I had a look at the spec of the accelerometer in question. (I had a similar problem!) Why do you use Zero Acceleration Output of +- 40 mV in you calculations of a full scale deflection? Shouldn't you be using the Sensitivity value?

Cheers,
Chris

Hi, Roger, I had a look at the spec of the accelerometer in question. (I had a similar problem!) Why do you use Zero Acceleration Output of +- 40 mV in you calculations of a full scale deflection? Shouldn't you be using the Sensitivity value? Cheers, Chris

Good morning Chris,

Most accelerometers I have used have a 0 Volt out put at 0 G. I know there are all sorts of other outputs but this was meant to be an example of how to scale an output.

As the link didn't have a specification for that accelerometer and I could not find one quickly I simply chose some figure that were typical for some accelerometers as an example.

If you have the actual figure then you can post them here so we all know.

Cheers,
Roger

Good morning Chris, Most accelerometers I have used have a 0 Volt out put at 0 G. I know there are all sorts of other outputs but this was meant to be an example of how to scale an output. As the link didn't have a specification for that accelerometer and I could not find one quickly I simply chose some figure that were typical for some accelerometers as an example. If you have the actual figure then you can post them here so we all know. Cheers, Roger

Hi Roger,

No big problem, just that looking at the spec for 1201, it gives (for +-100g unit) ZERO ACCEL OUTPUT as <+-40mV and SENSITIVITY as 0.9 mV/g.

The way I read it, this should mean the output at +100g (ie full scale) would be +90 mV above ZERO OUTPUT. Am I wrong????

Chris

Hi Roger, No big problem, just that looking at the spec for 1201, it gives (for +-100g unit) ZERO ACCEL OUTPUT as &lt;+-40mV and SENSITIVITY as 0.9 mV/g. The way I read it, this should mean the output at +100g (ie full scale) would be +90 mV above ZERO OUTPUT. Am I wrong???? Chris

Good afternoon Chris,

Yes, +/-100 G at 0.9 mV/g gives us +/- 90 mV full scale. The next part is any zero offset. If at zero g the output is +10 mV then

Upper out put +100 g = 90 mV Range + 10 mV offset = 100 mV full scale
and -100 g = -90 mV Range + 10 mV = -80 mV full scale.

So now your span will be:
Lower Physical = -100
Upper Physical = 100
Lower signal = -80
Upper signal = 100
Units = G

Cheers,
Roger

Good afternoon Chris, Yes, +/-100 G at 0.9 mV/g gives us +/- 90 mV full scale. The next part is any zero offset. If at zero g the output is +10 mV then Upper out put +100 g = 90 mV Range + 10 mV offset = 100 mV full scale and -100 g = -90 mV Range + 10 mV = -80 mV full scale. So now your span will be: Lower Physical = -100 Upper Physical = 100 Lower signal = -80 Upper signal = 100 Units = G Cheers, Roger
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