Specifications

4.5 Example code output

If the autophase procedure is unable to find a clock phase location that yields a

BER result below the threshold, the output looks like:

N4963A CLOCK SYNTHESIZER13.5 GHZ GPIB::16 setup..done

N4962A SERIAL BERT 12.5 GB/S GPIB::5 setup..done

Autoalign and error check..14 degrees..failed

0.1, BER: 0.000100685; bits: 985661000; errs: 99241

When the autophase is able to successfully align the clock and data, the BER

measurement runs for 10 seconds and the output looks like:

N4963A CLOCK SYNTHESIZER13.5 GHZ GPIB::16 setup..done

N4962A SERIAL BERT 11.3 GB/S GPIB::5 setup..done

Autoalign and error check..12 degrees..passed

10s BER measurement

1.021, BER: 0; bits: 9839830000; errs: 0

2.054, BER: 0; bits: 20049800000; errs: 0

3.087, BER: 0; bits: 30251400000; errs: 0

4.121, BER: 0; bits: 40460300000; errs: 0

5.157, BER: 0; bits: 50729000000; errs: 0

6.19, BER: 0; bits: 60974700000; errs: 0

7.223, BER: 0; bits: 70917300000; errs: 0

8.257, BER: 0; bits: 81128300000; errs: 0

9.29, BER: 0; bits: 91336200000; errs: 0

10, BER: 0; bits: 98367900000; errs: 0

4.6 Useful code snippets

Once you’ve referenced the VISA-COM library in your Visual Studio project,

assigned a using command to simplify the object namespace, initialized a

resource manager object and a message-based session object, and connected

to an instrument, now what?

To reset the N4963A clock synthesizer13.5 GHz, set the frequency to a pre-

specified value, turn all output amplitudes to the maximum level, and enable all

outputs:

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);