Hi, in a circular buffered acquisition the scan backlog indicates the number of acquired data to be retrieved from the allocated buffer. If the scan backlog overcomes the buffer size an error (code:-10846)is generated, this situation occurs when you are not reading fast enough from the buffer untill you fill it. Therefore you have to keep the scan backlog at a low and above all stable level. Maybe the question is: how do I know if my application will meet this stable condition? Just try it and indeed check the scan backlog: if it remains at 0 or at a low level and doesn't increase continously, the application is robust; otherwise it needs to be optimized. There are many different ways to optimize a buffered acquisition, but maybe it is not the subject of your question. Anyway, these are general informations for buffered acquisition; you can find more details in the LV Data Acquisition Basics Manual. Hope it helps, Alberto
