Hi Mark,
This looks great.
Thank you,
-Matt
On 11/28/2012 05:05 PM, Mark Rivers wrote:
> Hi Matt,
>
> I made measurements of the noise floor as a function of input
> voltage for the Measurement Computing 1608G-A20.
>
> http://cars9.uchicago.edu/software/epics/measComp1608GDoc.html
>
> On the +- 10V full scale, the noise floor is 1 bit (300
> microvolts) between -2V and 2V and less than 3 bits (1 mV)
> over the full +- 10V range. The voltage source was the unit
> itself, so some of the noise might have been on the output,
> rather than the input.
>
> Mark
>
> ________________________________________ From:
> [email protected] [[email protected]]
> on behalf of Matt Rippa [[email protected]] Sent: Wednesday,
> November 28, 2012 8:54 PM To: S. Stein Cc:
> [email protected] Subject: Re: Data acquisition for ICP
> accelerometers
>
> Our accelerometers are also from PCB Piezotronics. We use
> model#'s 333B50 and some triaxial 356B18. Their resolution
> goes down to 50 ug so at some point I worry about the noise
> floor with the less expensive DAQ units. Have you had any
> concerns along these lines? I believe many sites are
> amplifying these signals to overcome this. The turn key
> systems I referred to are all significantly more expensive
> but the dynamic range is upwards of 144 dB.
>
> Josh, I'm certainly interested to learn more about your
> system.
>
> Thanks for all the input. -Matt
>
>
> On 11/28/2012 06:22 AM, S. Stein wrote:
>> As Mark pointed out, the APS has installed a few 3-axis
>> accelerometer systems as a way of monitoring effects of
>> large equipment near certain points of interest. These use
>> Piezo transducers from a company named "PCB Piezotronics"
>> coupled to an amplifier which - as Mark indicated - feed
>> into an inexpensive USB ADC from Measurement Computing.
>>
>> The system works under Windows currently due to the
>> libraries which were supplied being Win32 based. We do have
>> a student working on Linux drivers which have shown
>> promise; enough that we hope our next installations will be
>> under on a Linux OS.
>>
>> I'll be happy to give you more info if this interests you,
>>
>> --Josh
>>
>>
>> ----- Original Message ----- From: "matthew pearson"
>> <[email protected]> To: [email protected],
>> [email protected] Sent: Wednesday, November 28, 2012
>> 4:50:23 AM Subject: RE: Data acquisition for ICP
>> accelerometers
>>
>> Hi,
>>
>> This probably doesn't meet your requirements, but thought
>> I'd mention it...
>>
>> On at least one beamline at DLS we have a few Bruel &
>> Kjaer charge accelerometers mounted inside a UHV double
>> crystal monochromator. We use their Nexus amplifier to read
>> the signals and feed them into a 16-bit ADC, and we control
>> the amplifier via RS232. Then we do a FFT on the amplifier
>> waveform data. But we only have a few channels to deal
>> with, and we don't actively monitor the data (just analyse
>> it on a ah-hoc basis when we have time).
>>
>> However, we've only just started to use them so we don't
>> have much experience with them so far. I'm not sure which
>> actual accelerometer we're using, but the manufacturer has
>> a range of different types. We use them for looking for
>> mechanical vibrations in the 1-100Hz range.
>>
>> http://www.bksv.com/products/transducers/conditioning/charge/2692c.aspx?JsEnabled=0
>>
>>
>>
Emma Shepherd developed the streams based Epics support for
>> the amplifier.
>>
>>
>> Cheers, Matt
>>
>>
>>> -----Original Message----- From:
>>> [email protected] [mailto:tech-talk-
>>> [email protected]] On Behalf Of Matt Rippa Sent: 28
>>> November 2012 02:39 To: [email protected] Subject:
>>> Data acquisition for ICP accelerometers
>>>
>>> Hi,
>>>
>>> Has anyone worked with vibration monitoring and analysis
>>> in EPICS? We're looking for a digitizing system with 24
>>> or more channels and dynamic range of 96 dB or higher.
>>> Our sensors are ICP accelerometers with resolution down
>>> to 50 ug's (uV) and sensitivity of 1V/g.
>>>
>>> It seems there are plenty of 'turn-key' systems out
>>> there with Windows only. For example, this is a good fit
>>> but no linux/epics.
>>>
>>> http://www.spectraldynamics.com/index.php/products/puma
>>>
>>> Thanks, -Matt
>>
>>
>
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