1520 strain no reading

Experimental set-up:

SCXI chassis, the module of 1520, 1314 accessory; 6062E pcmcia.

Half bridge 350 ohm (type II), and even that (checked by manual measurement with multimeter) shunt resistors. Self excitation (2, 5V).

I want to measure the strain but cannot. When I started to acquisition, an initial value is shown, say,-200. The value decreases at a constant rate until it reaches autour-970, remains constant.

I checked manually:

P - P voltage +: 2.49V

Voltage output - P: - 1.24

Output voltage - P'+: 1.24

Voltage at the terminals of R4: 1.24 V

Voltage at the terminals of the R3: 1.24 V

P + - Vout resistance: 350 ohms

Resistance P - Vout: 350 ohm

If I try the offset null calibration, I get error-200380 (see attachment).

So it looks like an open circuit, but I interpret manually tension through R, what happens?

I am amazed on the solution that I found:

After checking with the multimeter is everything as should be, I changed full bridge configuration in order to access with the meter at each point in the bridge and provide measures.

Everything was going fine manually but still not in LV

So, after a while, I changed .vi DAQmx Read of multiple channels of wave rippling single channel, as I was measuring only one channel.

Now everything works fine.

I am amazed, I supoused that channel Multiple consisted only a single channel.

Tags: NI Software

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