Hi Ben,
Just getting round to testing these now hope to ship today, few questions.
should C8 be DNI or is it ok to have populated, it was on BOM but is DNI in
schematics.
Also one board is failing test, when i short TH 5 and 6 instead of the
reading in shimmer connect dropping to zero i am getting 46, it drops ok on
all the other boards. would this be an issue with the corresponding op-amp.
Regards
Danny
Senior Test Technician
Realtime Technologies Ltd.
Clonshaugh Business Park,
Dublin 17, IRELAND.
W: www.realtime.ie
W: www.shimmer-research.com
-----Original Message-----
From: [email protected]
Sent: Saturday, May 19, 2012 5:00 PM
To: [email protected]
Subject: Shimmer-users Digest, Vol 62, Issue 11
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Today's Topics:
1. Raw Shimmer data (Maxim Michel)
2. Re: Raw Shimmer data (Benjamin Kuris)
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Message: 1
Date: Sat, 19 May 2012 15:25:09 +0200
From: Maxim Michel <[email protected]>
To: [email protected]
Subject: [Shimmer-users] Raw Shimmer data
Message-ID:
<caayqb3srvyckqcsh8xbw_jaiqq6mpbnoc-3jdkzyugpruw1...@mail.gmail.com>
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What does the raw data obtained by the accelerometer (value around 2000)
represent exactly?
Are these the amplitudes in mV which can be converted into G-forces?
I've read in the accelerometer datasheet every 800mV represents 1G at a
measuring range of 1.5G.
Is this the correct interpretation?
Thanks
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Message: 2
Date: Sat, 19 May 2012 09:41:25 -0400
From: Benjamin Kuris <[email protected]>
To: Maxim Michel <[email protected]>
Cc: [email protected]
Subject: Re: [Shimmer-users] Raw Shimmer data
Message-ID:
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Convert raw data (bits) into volts using the formula: Data(V) =
data(Bits) /4095(Bits) * 3V
Then look at the accelerometer datasheet. Doublecheck the accel
voltage test condition on the datasheet and scale the amplitude
accordingly if needed.
The measurement you mention (800mV/1G would be in reference to a
zero-output level which is typically at VDD/2 or 1.5V on a Shimmer.
For more information see the calibration guide and documentation on
the Shimmer website. Commodity MEMs accelerometers have significant
offset and gain. It is best to use manual methods or the calibration
application to correct for these.
-Ben
On Sat, May 19, 2012 at 9:25 AM, Maxim Michel <[email protected]> wrote:
What does the raw data obtained by the accelerometer (value around 2000)
represent exactly?
Are these the amplitudes in mV which can be converted into G-forces?
I've read in the accelerometer datasheet every 800mV represents 1G at a
measuring range of 1.5G.
Is this the correct interpretation?
Thanks
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