SMU 6341 and SCB-68: problem with several entries... * URGENT *.

Hello

I have an urgent problem, I would really appreciate help with.

I have a terminal block (SCB-68) connected to a multifunction data acquisition (6341). There are 4 entries in the Terminal:

1 sensor laser displacement, coming from a controller as a signal of analog voltage output ("1V" and "0V" on the controller). Connected to AI 0 and GND.

2. The accelerometer (PKI, coming from a then the voltage signal conditioner) connected to GND AI and AI 10.

3 load cells (PKI, coming from a then the voltage signal conditioner) connected to AI 11, 12, 13 and 14, each connected to the GND PIN is close.

Problem:

By MAX, if I read in 6 channels above my data acquisition (6341), my displacement sensor (#1) and the accelerometer (#2) behave very well. However, among the channels (AI 11 and AI 12) load cell switch in tension, as if they follow the movement sensor voltage (#1). For example, there is usually a mV - 800 in AI 11 voltage change.

This problem disappears when I'm not reading travel (HAVE 0, #1) laser. that is as soon as I remove this channel of my task, the readings of cell and accelerometer support back to normal (base voltage ~ 0V). Yet once if I ask again the laser channel, I see a vertical movement in the readings of load cell 2 (displacement varies with the current tension HAVE 0).

Attempts of fixation:

-tried to change the differential using AI laser sensor 0 and AI 9

-tried to delete the field of laser 120V Power

Any ideas at all would be greatly appreciated!

SCB-68:

http://sine.NI.com/NIPs/CDs/view/p/lang/en/NID/1180

SMU-6341:

http://sine.NI.com/NIPs/CDs/view/p/lang/en/NID/207415

This is the general idea.  If you must use high impedance sources and that you have enough channels available, placing a channel of the grounding of entry between each other usually helps.  You must analyze these chains grounded.  Just grounded isn't them enough.

Example: Sensor has = AI0, ground = AI1, sensor B = AI2, ground = AI3, sensor C = AI4, AI5 = ground.  Read AI0:5.

Lynn

Tags: NI Hardware

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