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Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 77
Programming Examples
GPIB Programming Interface Examples
viScanf(vi, "%t", rdBuffer); // Reads response into rdBuffer
// Prints the source frequency
printf("Source CW frequency is : %s\n", rdBuffer);
printf("Press any key to continue\n");
printf("\n"); // Prints new line character to the display
getch();
viPrintf(vi, "POW:AMPL?\n"); // Querys the power level
viScanf(vi, "%t", rdBuffer); // Reads the response into rdBuffer
// Prints the source power level
printf("Source power (dBm) is : %s\n", rdBuffer);
printf("Press any key to continue\n");
printf("\n"); // Prints new line character to the display
getch();
viPrintf(vi, "FREQ:MODE?\n"); // Querys the frequency mode
viScanf(vi, "%t", rdBuffer); // Reads the response into rdBuffer
// Prints the source freq mode
printf("Source frequency mode is : %s\n", rdBuffer);
printf("Press any key to continue\n");
printf("\n"); // Prints new line character to the display
getch();
viPrintf(vi, "OUTP OFF\n"); // Turns source RF state off
viPrintf(vi, "OUTP?\n"); // Querys the signal generator's RF state
viScanf(vi, "%1i", &num); // Reads the response (integer value)
// Prints the on/off RF state
if (num > 0 ) {
printf("Source RF state is : on\n");
}else{
printf("Source RF state is : off\n");
}
// Close the sessions
viClose(vi);
viClose(defaultRM);
}
Generating a CW Signal Using VISA and C
This example uses VISA library functions to control the signal generator. The signal generator is set
for a CW frequency of 500 kHz and a power level of −2.3 dBm. Launch
Microsoft Visual C++ 6.0, add the required files, and enter the code into your .cpp source file.
visaex4.cpp performs the following functions:
• verifies the GPIB connections and interface are functional
• resets the signal generator
• queries the instrument (CW frequency, power level, frequency mode, and RF state)
• reads responses into the rdBuffer (CW frequency, power level, and frequency mode)