BAD Offset Null

Hi all. I measure the strain with gauges of half-bridge. I use offset null, but if I change rate samples each time I have nonzero values. I now what is a ghost, but is at - it a method or calculations now which is exactly the rate for me to get the values null on unloaded of the strain gauges?

P.S. I get about rates zero on = 15000 s/s

http://digital.NI.com/public.nsf/allkb/73CB0FB296814E2286256FFD00028DDF

I'm guessing you already read that, will depend on so the real answer to how fast you can taste on the impedance of the system and how fast can stabilize a load high-impedance switching between channels.

Tags: NI Software

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    Hello

    I'm trying to use the example
    load_cell_null_off_shuntcal.VI with a scale of full-bridge (Honeywell
    Model 31, not amplified). I'm using LabView 8.6, cDAQ-9172 and NI9237. The
    load cell is connected to the pins 2,3,6 and 7.

    Entries for the front side of the VI
    are: excitation10V internal; mV/V 2.1492 (calibration sheet); weight max 10
    lbs; resistance bridge 350 ohms (Honeywell specifications); 9237 shunt internal
    100 kohm resistance; map of shunt R4 (default setting). I chose
    "Do not offset null" and "shunt cal.

    This is the error I get:

    Error-200077 occurred at DAQmx
    Do a calibration Shunt (bridge) .vi:1 or the possible reasons:

    Measurements: Requested value is not
    support for this property value.

    Property:
    AI. Bridge.ShuntCal.GainAdjust

    You asked:-61.980405e3

    Valid values begin with: 500.0e - 3

    Valid values ending with: 1.500000

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    .VI (bridge) contains a "Call library function node" which I did not
    find out how interrogate.

    Someone else has experience
    with this error? Do you have any advice on:

    1)
    How to 'see' the calculations being
    carried out inside the "call library function node"?

    2)
    What the correct shunt element
    a full-bridge load cell location is? (although changing this location only)
    does not eliminate the error, I can't find this info).

    3)
    What can I do wrong with
    my entries to cause this error?

    Thank you

    Claire.

    Hi Claire,

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    See the example

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