Can't see the rise on a USB 6212 BNC channel time

Hello

I use an acquisition of data NI USB 6212 BNC to monitor the rise time. A single channel (AO0) is used to define a voltage all followed another channel (AI1). The problem I have is that I'm not able to see the rise on AI1 time, only a jump to the specified voltage.

I started to edit one of the material examples. Initially, I have connected the two channels via a BNC connector to BNC cable but thought I better with a simple circuit. I set up a resistance on a model and connected my channels accordingly with crocodile clips. Unfortunately, the result remained the same and all I see is a jump to the previous setting in tension (usually 0) to the new I entered with a infinite slope (vertical line).

I am fairly new to DAQ and plan to work with it for a while. The simple circuit will be expanded considerably in filter tests and other applications, but for now, I have to get the basics. I would appreciate help, that you can offer; only currently, my thoughts are if this could be a sampling problem (I put it to 400000 above) and if I may add a ceiling to slow things down. I want to get this to work, however, so I could develop by looking at rates of filters and sweep of the go-around.

I enclose my screws in the hope that they will help you decipher the problem. Have tried different combinations on DAQ Read and Write with single or multiple and 1DB/Waveform channel, although I'm pretty green in their functioning, without success.

In hoping to hear talk about you,
Yusif Nurizade

Yusif Nurizade,

What type of signal you generate on the AO line? The default value in the output array is a single element zero. That didn't exactly have a rise time!

To measure rise times sampling on the line frequency should be fast enough to get samples of several over the course of the rising part of the measured waveform.

The signal on the AO line will always be in the steps from one value to another. This is the way of working with D/A converters. 6212 specifications indicate a speed of 5 V / us. If two successive samples were 0 to 10 v it would take exit 4 move us from one value to another. Same samplng HAVE it line 400 kech. / s, you would get no more than an intermediate value and would not be able to measure the rise time.

Try putting an R - C circuit with a time constant on the order of milliseconds between connections AO and AI. You should be able to measure it.

Lynn

Tags: NI Hardware

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