Pendulum CNT-91 - AM Signals

// Find the instrument
if ( Args.bUSB )
{
// Look on USB for something made by Pendulum with model
// code 0x0091.
// For this sample program we'll just pick the first
// found, if any.
sprintf(Command, "USB?*INSTR{VI_ATTR_MANF_ID==0x14EB &&
VI_ATTR_MODEL_CODE==0x0091}");
}
else // GPIB
sprintf(Command, "GPIB::%d::INSTR", Args.nAddr);
Status = viFindRsrc(defaultRM, Command, &fList, &numInstrs,
Desc);
if (Status != VI_SUCCESS)
{
fprintf(stderr, "Didn't find instrument\n");
viClose(defaultRM);
return(-1);
}
// Open communication with the device.
if (viOpen(defaultRM, Desc, VI_NULL, VI_NULL, &Instr) !=
VI_SUCCESS)
QuitMsg("Couldn't open connection to the instrument\n");
// Set short timeout for message-based communication (1 s)
if (viSetAttribute(Instr, VI_ATTR_TMO_VALUE, 1000) !=
VI_SUCCESS)
QuitMsg("Failed to set timeout\n");
// Clear the instrument
if (viClear(Instr) != VI_SUCCESS)
QuitMsg("Couldn't clear the instrument\n");
// Check IDN.
if (WriteDev("*idn?") != VI_SUCCESS) Quit();
if (ReadDev(Buffer, BUFSIZE, &ReadLength) != VI_SUCCESS)
Quit();
Buffer[ReadLength] = 0; // Null terminate.
printf("%s\n", Buffer);
// Initialize the instrument.
printf("Testing %s with pacing: %g\n", Args.Func,
Args.Pacing);
printf("Press any key to cancel.\n");
fflush(stdout);
if (WriteDev("*cls;*rst") != VI_SUCCESS) Quit();
if (WriteDev("*ese 0;*sre 0") != VI_SUCCESS) Quit();
// Set Meas Func
Programming Examples
4-20 Error Code