what does mV/V mean?

Before I order some expensive pressure sensors, I have a trivial question (just to make sure):

The specs read: Excitation voltage 10Vdc,24Vdc(8-36Vdc) Output options: 1.5mV/V, 2mV/V, 2.5 mV/V, 3.33 mV/V,4-20mA,0-10V,0-5V,0-20mA

What does mV/V mean?

Thanks, Mike

Reply to
siliconmike
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Simple :) it is a 4 resistor bridge sensor. If you supply the bridge with 1 volt , it outputs the given number of millivolts for full range signal. So if the bridge allows 10 volt supply, you get 10 times the specified Millivolts.

Reply to
Sjouke Burry

Ok, you have 1V across the widgit, and you stress the widgit, and it gives you say a reading of 5mV

do the identical with 3v across the widget and it will give you 3 times ie 3/1 the voltage, so15mV

martin

Reply to
martin griffith

You mean that for the 1.5mV/V option the sensor spits 15 mV at full scale pressure while on a 10V excitation? Isn't that a too noise-prone voltage for full scale?

Mike

Reply to
siliconmike

Welcome to the world of sensors---15mV is a princely voltage here. The world would beat a path to the door of someone with a clever idea for a stress sensor (or temperature sensor or...) directly giving large voltages.

For example, a typical thermocouple voltage is 3-5 mV/K.

Reply to
przemek klosowski

Yep, thats just it, and no, there is no noise problem,its a rather low impedance voltage floating differential output. So you need a differential amplifier for the bridge output. Better buy the sensor with a buildin amp, if they sell it.

Reply to
Sjouke Burry

Yep, thats just it, and no, there is no noise problem,its a rather low impedance voltage floating differential output. So you need a differential amplifier for the bridge output. Better buy the sensor with a buildin amp, if they sell it.

Reply to
Sjouke Burry

More like 10-50uV/K for the common types.

Reply to
Spehro Pefhany

it means 1/1000 or 0.001 obviously.

In this instance it means that for an input voltage of X you get an output voltage of Y = X x scale factor in mV/V

Graham

Reply to
Eeyore

Right.

Not with good signal conditioning and A/D conversion. A load cell can put out 30 mV full scale and weigh things to 0.01% accuracy and linearity.

John

Reply to
John Larkin

Hello Mike,

That's why we analog guys will always have something to do :-)))

15mV is actually a lot.
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Regards, Joerg

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Reply to
Joerg

"siliconmike" schreef in bericht news: snipped-for-privacy@m73g2000cwd.googlegroups.com...

15mV is plenty, and it comes from a pretty low impedance. Noise is not a big problem, there are not very high frequencies to be expected in a pressure sensor, so you can filter plenty.
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Thanks, Frank.
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Reply to
Frank Bemelman

15mV is *loads* !

Graham

Reply to
Eeyore

It IS included, reread the output options, they include 4-20 mA and 0-10 V, this is a fully conditioned sensor.

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 JosephKK
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Reply to
joseph2k

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