Agilent Technologies Portable Generator Waveform File Creation for N5183A Models

Creating and Downloading Waveform Files

Programming Examples

if (outfile==NULL) perror (“Error opening file to write”); for(index=0; index<numsamples; index++)

{

fprintf(outfile, “%d, %d\n”, idata[index], qdata[index]);

}

fclose(outfile);

//The E443xB, E4438C, E8267C or E8267D all use big-endian

//processors. If your software is running on a little-endian

//processor such as Intel, then you will need to swap the

//bytes in the data before sending it to the signal generator.

//The arrays ibuffer and qbuffer are used to hold the data

//after any byte swapping, shifting or scaling.

//In this example, we’ll assume that the data is in the format

//of the E443xB without markers. In other words, the data

//is in the range 0-16383.

//0 gives negative full-scale output

//8192 gives 0 V output

//16383 gives positive full-scale output

//If this is not the scaling of your data, then you will need

//to scale your data appropriately in the next two blocks.

//ibuffer and qbuffer will hold the data in the E443xB format.

//No scaling is needed, however we need to swap the byte order

//on a little endian computer. Remove the byte swapping

//if you are using a big endian computer.

for(index=0; index<numsamples; index++)

{

int ivalue = idata[index];
int qvalue = qdata[index];
ibuffer[index*2]	= (ivalue >> 8)	& 0xFF; // high byte of i
ibuffer[index*2+1]	= ivalue & 0xFF;		// low byte of i
qbuffer[index*2]	= (qvalue >> 8)	& 0xFF; // high byte of q
qbuffer[index*2+1] = qvalue & 0xFF;			// low byte of q

}

//iqbuffer will hold the data in the E4438C, E8267C, E8267D

//format. In this format, the I and Q data is interleaved.

//The data is in the range -32768 to 32767.

//-32768 gives negative full-scale output

252 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide