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564 Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference
9 Programming Examples
/* Write image data to file. */
fp = fopen ("c:\\scope\\data\\screen.bmp", "wb");
img_size = fwrite(image_data, sizeof(unsigned char), img_size, fp);
fclose (fp);
printf("Wrote image data (%d bytes) to file.\n", img_size);
viSetAttribute(vi, VI_ATTR_TMO_VALUE, 5000);
/* MEASURE - The commands in the MEASURE subsystem are used to
* make measurements on displayed waveforms.
*/
/* Set source to measure. */
viPrintf(vi, ":MEASURE:SOURCE CHANNEL1\n");
/* Query for frequency. */
viQueryf(vi, ":MEASURE:FREQUENCY?\n", "%lf", &frequency);
printf("The frequency is: %.4f kHz\n", frequency / 1000);
/* Query for peak to peak voltage. */
viQueryf(vi, ":MEASURE:VPP?\n", "%lf", &vpp);
printf("The peak to peak voltage is: %.2f V\n", vpp);
/* WAVEFORM_DATA - Get waveform data from oscilloscope.
*/
get_waveform();
/* Make some calculations from the preamble data. */
vdiv = 32 * preamble [7];
off = preamble [8];
sdiv = preamble [2] * preamble [4] / 10;
delay = (preamble [2] / 2) * preamble [4] + preamble [5];
/* Print them out... */
printf ("Scope Settings for Channel 1:\n");
printf ("Volts per Division = %f\n", vdiv);
printf ("Offset = %f\n", off);
printf ("Seconds per Division = %f\n", sdiv);
printf ("Delay = %f\n", delay);
/* print out the waveform voltage at selected points */
for(i=0;i<1000; i = i + 50)
printf ("Data Point %4d = %6.2f Volts at %10f Seconds\n", i,
((float)waveform_data[i] - preamble[9]) * preamble[7] +
preamble[8],
((float)i - preamble[6]) * preamble[4] + preamble[5]);
save_waveform(); /* Save waveform data to disk. */
retrieve_waveform(); /* Load waveform data from disk. */
}
/*
* get_waveform
* ------------------------------------------------------------------
* This function transfers the data displayed on the oscilloscope to
* the computer for storage, plotting, or further analysis.
*/