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Thread: Data logging voltmeter

  1. #1

    Cool Data logging voltmeter

    It should have a setup to measure DC voltage ( 0 ~10mV)
    Resolution should be 0.1mV.
    It should have memory to save the voltage values.
    The data have to be retrieved and viewed in the PC in the usable format(preferably Excel format).
    Rechargeable battery setup.(not mandatory)
    Compact & easy operation.

    These are my requirements... Does Anyone knows any company to design this??

    With regards,
    solomon
    +91 9178454959

  2. #2
    Junior Member Newbie
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    Should be doable , what is the source of this voltage.

    And do you have a ballpark budget for the project.

  3. #3
    Member Advanced User MGear's Avatar
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    Seems to be quite an interesting device. What application are you using it for?

  4. #4
    Senior Member Cyborg
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    What is your budget ?

  5. #5
    Senior Member T-1000
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    Its not as easy as it looks.

    You haven't mentioned the accuracy you need. Since your resolution is 0.1mV or 100uV, I'll assume half of that (+/-50uV accuracy). At these levels, noise is going to be a major factor. And whoever is going to design will need to look into some killer Op-Amps, professional PCB designing and isolation between the PC and this setup. PC SMPS is a major source of noise.

    Once the analog part is done, things should get easier.

    1. Can you tell us how much current is this measurement device allowed to draw?
    2. What kind of PC interface - Serial, USB, etc.?
    3. How many memory points?
    4. What is the form factor, i.e. volume/size/dimensions of the device?
    5. What is the BOM price you are looking at?

    Regards,
    Mohit.
    http://www.BioZen.co.in
    Last edited by MohitM; 05-20-2010 at 05:45 PM.
    --
    Mohit Mahajan,
    www.BioZen.co.in

  6. #6
    Senior Member Cyborg
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    And in addition to above,

    1. What is the sampling rate you are expecting ?
    2. For how much time?
    3. What is a sensitivity of your sensor / source. Note this is different than resolution.
    Sensitivity means responce of your sensor to delet smallest delta change in parameter which sensor is measuring.
    This is usefull to decide the ADC resolution like 8 bit / 12 bit /16 bit/24bit etc.
    4. What will be the distance between the sensor and your this Data logging voltmeter ?
    Cabling is really too difficult if distance is too long because of your sensor's output is voltage rather it has to be industry standard 4-20 mA loop
    Last edited by Ulhas; 05-21-2010 at 08:26 PM.

  7. #7

    Default Thank you for your reply

    * It is not going to be connect with the PC all the time.
    * I am going to take the hundreds of voltage reading offline in a multimeter which has memory to store the data and come to my PC to see the those values and compare it.
    * Regarding noise and all, nowadays for this application we are using DM-352 MOTOWANE multimeter(It has no memory)
    * Sampling rate: No need for that because it is not going to take the reading automatically. There should be a save button to save the voltage value.

    Please provide me your email id so that i can mail the project ppt.

  8. #8

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    Regarding Budget: Its not a big deal but project should be successful... The product should be rugged to the industrial environement...

  9. #9
    Senior Member Cyborg
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    Quote Originally Posted by eanandsolomon View Post
    * It is not going to be connect with the PC all the time.
    * I am going to take the hundreds of voltage reading offline in a multimeter which has memory to store the data and come to my PC to see the those values and compare it.
    * Regarding noise and all, nowadays for this application we are using DM-352 MOTOWANE multimeter(It has no memory)
    * Sampling rate: No need for that because it is not going to take the reading automatically. There should be a save button to save the voltage value.

    Please provide me your email id so that i can mail the project ppt.
    Email id :- "usrrsr@yahoo.com"

  10. #10

    Default

    can anyone suggest me some project design centers for this application??

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