Problem of reliability data acquisition PXI-4071

Hello

I'm having a problem of reliability using my 4071 Pxi digitizer mode.

I have a number of tests that use the SMU-6363 (usually configured for DC) analog output to provide a stimulus for our own device, which has a number of a/d converters. We use the PXI system for calibration and testing.

1. I select a voltage ranging from tensions.

2. program the PXI-6363 to drive this tension

3 TIME about 10ms to settle. Note there no discrete capacitors or resistors in the circuit. Everything is parasitic and would generally be under the nF mark and less than 10 ohms

3. configure and Initiate() acquisition of data with the PXI-4071. In general, I use a sample rate of 1000 s/s and get about 30 samples (worth 30 ms). Activation is immediate and I used the default a queue time, 0, set the time and it doesn't seem to make a difference.

4. measure the voltage with the CDA. For debugging purposes I have sometimes made twice once before calling Initiate() and once after. The after is normal. The time required to measure the ADC is shorter than the acquisition time, but regardless of stimulation by the SMU-6363 is constant

5. extract the waveform.

6. the average waveform and compare the value of ADC measured by applying tolerances etc.

Here's the problem: it works well most of the time. But only 0.1% of the time (1 on an acquisition of 1000), I get 8-12 samples that are close to 0. It sounds like a problem of time settling (on the surface), but no matter the amount of wait time data, I always get this behavior. Not only that, but the tension before the call to Initiate() in height CDA, it always confirms that the motor voltage is already set to the programmed value. Nevertheless the acquisition presents near data 0.

So far our independent ADC always reports the expected before and during acquisition (100%) voltage. It's like the DMM input is disconnected during the acquisition during a period of time, because we have confirmed that the voltage is already present prior to the acquisition (component can). I have no errors the insider or FetchWaveForm calls. I still have all my samples. And 99.9% of the time that everything works as expected.

The DMM and ADC are connected to the same point and both are referenced to ground, and as I said before only the parasitic capacitance and resistance (cable). We use a matrix of switching (PXI-2530 (b) to make these connections. We almost always use 51/2 digits and 10V range for data acquisition.

Hello

I thought about it and was going to repost but am distracted.

The device with the ADC also has a mux and switches the mux to an internal node. It only switches when measuring and is open at other times. There is a race condition where the acquisition starts too early and maintains the acquisition after that the switch is open. Unfortunately I don't have the option to trigger.

I forgot the internal mux that I had designed the test years ago and I did some updates to improve the stability of the test. That's why we start the ADC measurement when acquiring.

I just added a routine to reject samples below a threshold

Tags: NI Hardware

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Shaheen.

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Kind regards

Leonard Brown
Technical sales engineer
Teledyne LeCroy
1-800-553-2769

Problem of reliability data acquisition PXI-4071

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