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About aburke3

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  1. Hello all, I'm trying to measure a 0-40mV signal with a differential setting using channels AIN2 and AIN3 in addition to measuring a 0-5V signal on AIN1. I've read tutorials but can't seem to get my 100 gain setting for channels 2 and 3 to work, the output I'm getting doesn't seem to be multiplied by 100. I pulled the following code from a combination of tutorials, could someone troubleshoot this? From https://labjack.com/support/datasheets/u6/high-level-driver/example-pseudocode/analog-inputs //Configure all analog inputs for max resolution. Like most //settings, this will apply to all further measurements until //the parameter is changed or the DLL unloaded. AddRequest (lngHandle, LJ_ioPUT_CONFIG, LJ_chAIN_RESOLUTION, 12, 0, 0); //Configure AIN1 for +/- 10 volt range. AddRequest (lngHandle, LJ_ioPUT_AIN_RANGE, 1, LJ_rgBIP10V, 0, 0); //Configure AIN2 for +/- 0.1 volt range. This applies to any //reading, single-ended or differential, where the positive //channel is AIN2. AddRequest (lngHandle, LJ_ioPUT_AIN_RANGE, 2, LJ_rgBIPP1V, 0, 0); //Request a single-ended read from AIN1. AddRequest (lngHandle, LJ_ioGET_AIN, 1, 0, 0, 0); //Request a differential read of AIN2-AIN3. AddRequest (lngHandle, LJ_ioGET_AIN_DIFF, 2, 0, 3, 0); //Request a single-ended read of AIN2. Here we use the DIFF //IOType, but pass x1=199 which does a single-ended measurement. AddRequest (lngHandle, LJ_ioGET_AIN_DIFF, 2, 0, 199, 0); //Execute the requests. GoOne (lngHandle); //Since multiple requests were made with the same IOType //and Channel, and only x1 was different, GetFirst/GetNext //must be used to retrieve the results. The simple //GetResult function does not use the x1 parameter and //thus there is no way to specify which result is desired. //Rather than specifying the IOType and Channel of the //result to be read, the GetFirst/GetNext functions retrieve //the results in order. Normally, GetFirst/GetNext are best //used in a loop, but here they are simply called in succession. //Retrieve AIN1 voltage. GetFirstResult returns the IOType, //Channel, Value, x1, and UserData from the first request. //In this example we are just retrieving the results in order //and Value is the only parameter we need. GetFirstResult (lngHandle, 0, 0, &dblValue, 0, 0); //Get the AIN2-AIN3 voltage. GetNextResult (lngHandle, 0, 0, &dblValue, 0, 0); //Get the AIN2. GetNextResult (lngHandle, 0, 0, &dblValue, 0, 0);