static void Main(string[] args)
{
// Setup variables
string SigGenAddress = @"GPIB0::10::INSTR";
string THDMeterAddress = @"GPIB0::1::INSTR";
ResourceManager ResMgr = new ResourceManager();
FormattedIO488 THDMeter = new FormattedIO488();
FormattedIO488 SigGen = new FormattedIO488();
AmplitudeCalibration AmpCal = AmplitudeCalibration.Off;
bool ACUnset = true;
int NumMeasurements = 0;
// Create the datafile
StreamWriter ReportFile = new StreamWriter(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + @"\3325BHarmonicDistortion.csv");
// Setup the VISA connection for the Keithley 2015
THDMeter.IO = (IMessage)ResMgr.Open(THDMeterAddress, AccessMode.NO_LOCK, 2000, null);
THDMeter.IO.TerminationCharacterEnabled = true;
THDMeter.IO.Timeout = 20000;
// Setup the VISA connection for the HP 3325B
SigGen.IO = (IMessage)ResMgr.Open(SigGenAddress, AccessMode.NO_LOCK, 2000, null);
SigGen.IO.TerminationCharacterEnabled = true;
SigGen.IO.Timeout = 20000;
// Initial HP 3325B settings and get the IDN to confirm its connected
SigGen.IO.Clear();
SigGen.WriteString("*RST;", true);
SigGen.WriteString("FU1;", true);
SigGen.WriteString("FR100HZ;", true);
SigGen.WriteString("AM999MV", true);
SigGen.WriteString("*IDN?;", true);
System.Threading.Thread.Sleep(1000);
string temp = SigGen.ReadString();
Console.WriteLine("3325B ID is: {0}", temp);
// Initial Keithley Settings and get IDN to confirm its connected
THDMeter.IO.Clear();
THDMeter.WriteString("*RST;", true);
THDMeter.WriteString("*IDN?;", true);
System.Threading.Thread.Sleep(1000);
temp = THDMeter.ReadString();
Console.WriteLine("2015THD Meter ID is: {0}", temp);
// Request amplitude calibration setting
Console.WriteLine("The 3325B amplitude can drift over time.\n\nPress 1 to turn calibration ON.\nPress 2 to turn calibration OFF.");
do
{
ConsoleKeyInfo key = Console.ReadKey();
switch (key.KeyChar)
{
case '1':
AmpCal = AmplitudeCalibration.On;
ACUnset = false;
break;
case '2':
AmpCal = AmplitudeCalibration.Off;
ACUnset = false;
break;
}
} while (ACUnset == true);
// Get the number of measurements
Console.WriteLine("\n\nEnter the number of measurements (AC On takes ~12s, AC Off takes ~10s)");
var loops = Console.ReadLine();
while (!int.TryParse(loops, out NumMeasurements))
{
Console.WriteLine("Please enter an integer number (for example 123)");
loops = Console.ReadLine();
}
// Setup for THD reading
THDMeter.WriteString(@":INIT:CONT OFF;", true);
THDMeter.WriteString(@":SENSe:FUNCtion 'DISTortion';", true);
THDMeter.WriteString(@":SENSe:DISTortion:TYPE THD;", true);
THDMeter.WriteString(@":SENSe:DISTortion:FREQuency:AUTO ON;", true);
THDMeter.WriteString(@":SENSe:DISTortion:HARMonic 04;", true);
THDMeter.WriteString(@":UNIT:DISTortion DB;", true);
THDMeter.WriteString(@":SENSe:DISTortion:SFILter NONE;", true);
THDMeter.WriteString(@":SENSe:DISTortion:RANGe:AUTO ON;", true);
// Create report header
Console.WriteLine("\n\n{0,14}{1,14}{2,14}{3,14}{4,14}", "Measurement", "THD", "2nd", "3rd", "4th");
ReportFile.WriteLine("{0},{1},{2},{3},{4},{5}", "Measurement", "Time", "THD", "2nd", "3rd", "4th");
// Take 10 measurements
for (int loopCount = 0; loopCount < NumMeasurements; loopCount++)
{
// Take a measurement
var m = TakeMeasurement(THDMeter, SigGen, loopCount, AmpCal);
// Write report line
Console.WriteLine("{0,14}{1,14}{2,14}{3,14}{4,14}", m.MeasurementNumber, m.THD, m.Harmonic2, m.Harmonic3, m.Harmonic4);
ReportFile.WriteLine("{0},{1},{2},{3},{4},{5}", m.MeasurementNumber, m.MeasurementDateTime.TimeOfDay, m.THD, m.Harmonic2, m.Harmonic3, m.Harmonic4);
}
// Close the report file
ReportFile.Close();
Console.WriteLine("\nEnter any key to exit");
Console.ReadKey();
}
private static Measurement TakeMeasurement(FormattedIO488 src, FormattedIO488 gen, int measurement, AmplitudeCalibration AmpCal)
{
// HP 3325B drifts so Check to see if the user wants amplitude calibration
if (AmpCal == AmplitudeCalibration.On)
{
gen.WriteString("AC;");
System.Threading.Thread.Sleep(2000);
}
// Take a THD reading
src.WriteString(@":INIT;", true);
System.Threading.Thread.Sleep(6000);
src.WriteString(@":SENSe:DISTortion:THD?;", true);
System.Threading.Thread.Sleep(1000);
double thd = src.ReadNumber();
//src.WriteString(@": INIT;");
src.WriteString(@":SENSe:DISTortion:HARMonic:MAGNitude? 2,2;", true);
System.Threading.Thread.Sleep(1000);
double harm2 = src.ReadNumber();
src.WriteString(@":SENSe:DISTortion:HARMonic:MAGNitude? 3,3;", true);
System.Threading.Thread.Sleep(1000);
double harm3 = src.ReadNumber();
src.WriteString(@":SENSe:DISTortion:HARMonic:MAGNitude? 4,4;", true);
System.Threading.Thread.Sleep(1000);
double harm4 = src.ReadNumber();
return(new Measurement(measurement, thd, harm2, harm3, harm4, DateTime.Now));
}
