Need help [continuous read from dmm Agilent 3458a] using Ivi.visa.interop

[Ironcoder]

Hi,

    I am trying to have a setup where i can read continous data(should i say synchronous read) from the multimeter 3458a, atleast 1000 readings per second. I am using Usb/GPIB to connet to the instrument. The 3458a manual mentions that its  possible to have 100,000 readings/sec over GPIB, i am barely getting 40 readings/ second. I am using IVI.Visa.interop to communicate with the instrument.

public void create_connection()

{

            ResourceManager rm = new ResourceManager();

            FormattedIO488 dmm = new FormattedIO488();

            string address = "GPIB0::25::INSTR";

            int numReadings = 1000;

            // Open path to DMM

            dmm.IO = (IMessage)rm.Open(address, AccessMode.NO_LOCK, 0, "");

             showreadings.text = "";   // text box

            for (int i = 0 ; i < numReadings ; i++)

                     showreadings.text +=  dmm.IO.ReadString(100);

}

  I configured the instrument to generate 1000 readings/s with aper and timer setting. But when i try to read in as shown above it takes more time.

  What is that i am doing wrong here?. why the data rate from the instruemtent to the pc is so slow?...do i need to use some other command for reading continously from the insturment?. Please help me out here, i am new to working with this instrument.

[Ironcoder]

int numReadings = 50;

txt_CommandLine.Text =

"";

DMM1.IO.Clear();

DMM1.WriteString(

"reset", true);

DMM1.WriteString(

"end on", true);

DMM1.WriteString(

"TARM SYN", true);

DMM1.WriteString(

"INBUF ON", true);

DMM1.WriteString(

"EXTOUT RCOMP", true);

DMM1.WriteString(

"oformat ASCII", true);

DMM1.WriteString(

"APER 0.00001", true);

DMM1.WriteString(

"TIMER 0.0001", true);

DMM1.WriteString(

"nrdgs " + numReadings.ToString() + ", AUTO" , true);

DMM1.WriteString(

"TBUFF ON", true);

txt_Aper.Text =DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff");

byte[] Data = DMM1.IO.Read(8 * numReadings); 

txt_QueryCommand.Text = DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff");

textBox3.Text += System.BitConverter.ToDouble(swapDouble(rawData, i * 8, 8), 0) + "\t{" + i + "}\r\n";

 using byte[] rawData = DMM1.IO.Read(8 * numReadings); to read stream of chacters somehow helps improve the reading rate but now the readings are stopped or required number of bytes are not retured all the time. if i define 100 readings , it may return 800(8*numReadings) bytes sometimes but for most of the time, number of bytes returned are less.. Has anyone done this ?..to read continous stream of reading/data from instrument ...please help, i am really stuck bad here =(