Specifications

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4.3 Communicating with an instrument using the VISA-COM library

The next step is to assign the message-based session to a specific instrument

using the resource manager. There are easy and difficult methods to do this, the

hardest of which would be an automated scan of the resources available.

The code example shown below details how you connect to an instrument

where the GPIB address is known.

4.4 10-second BER measurement example using the N4962A serial BERT 12.5 Gb/s and N4963A clock synthesizer

13.5 GHz with a VISA-COM library in Visual C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Ivi.Visa.Interop;

namespace TG1B1A_VISA_demo

{

class Program

{

static void Main(string[] args)

{

// resource manager and message-based session manager

ResourceManager rMgr = new ResourceManagerClass();

FormattedIO488 src = new FormattedIO488Class();

FormattedIO488 BERT = new FormattedIO488Class();

// measurement setup

string srcAddress = “GPIB::16”; // GPIB address of N4963A CLOCK

SYNTHESIZER13.5 GHZ

double srcFreq = 10e9; // frequency in Hz

string BERTAddress = “GPIB::5”; // GPIB address of N4962A SERIAL BERT 12.5

GB/S

string BERTPattern = “PRBS7”; // PRBS pattern

double BERTAmplitude = 0.5; // output amplitude

double BERTGateTime = 10; // measurement gate time

double BERTErrThreshold = 1e-5; // pre-measurement error threshold

bool BERTErrInj = false; // error injection

string BERTErrInjRate = “1E2”; // error injection rate

// connect to instruments

src.IO = (IMessage)rMgr.Open(srcAddress, AccessMode.NO_LOCK, 2000, null);

src.IO.Timeout = 2000;

BERT.IO = (IMessage)rMgr.Open(BERTAddress, AccessMode.NO_LOCK,

2000, null);

BERT.IO.Timeout = 2000;

// setup clock

Console.Write(“N4963A CLOCK SYNTHESIZER13.5 GHZ “ + srcAddress + “ setup..”);

src.IO.Clear();

src.WriteString(“*RST;*OPC?”, true);

string temp = src.ReadString();

src.WriteString(“:FREQ “ + srcFreq, true);

src.WriteString(“:AMPL 1 1.5”, true);

src.WriteString(“:AMPL 2 1.5”, true);

src.WriteString(“:AMPL 3 0.8”, true);

src.WriteString(“:AMPL 4 0.8”, true);

src.WriteString(“:OUTP ON”, true);

Console.WriteLine(“done”);