Keysight Technologies E3646A - Page 170

5 Application Programs
Example Program for C and C++
146 E364xA User’s and Service Guide
void OpenPort();
void main()
{
double voltage; /* Value of voltage sent to power supply */
char Buffer[256]; /* String returned from power supply */
double current; /* Value of current output of power supply */
OpenPort();
/* Query the power supply id, read response and print it */
sprintf(Buffer,"*IDN?");
SendSCPI(Buffer);
printf("Instrument identification string:\n %s\n\n",Buffer);
SendSCPI("*RST"); /* Set power-on condition */
SendSCPI("Current 2"); /* Set current limit to 2A */
SendSCPI("Output on"); /* Turn output on */
printf("Voltage Current\n\n"); /* Print heading */
/*Step from 0.6 to 0.8 volt in 0.02 steps */
for(voltage = 0.6; voltage <=0.8001; voltage +=0.02)
{
printf("%.3f",voltage); /* Display diode voltage*/
/* Set output voltage */
ErrorStatus = viPrintf(power_supply,"Volt %f\n",voltage);
if(!bGPIB)
delay(500);/* 500 msec wating for RS-232 interface*/
CheckError("Unable to set voltage");
/* Measure output current */
ErrorStatus = viPrintf(power_supply,"Measure:Current?\n");
CheckError("Unable to write device");
delay(500); /* Allow output to wait for 500 msec */
/* Retrieve reading */
ErrorStatus = viScanf(power_supply,"%lf",&current);
CheckError("Unable to read voltage");
printf("%6.4f\n",current); /* Display diode current */
}
SendSCPI("Output off"); /* Turn output off */
ClosePort();
}
/* Build the address required to open communication with GPIB card or RS-232.*/
/* The address format looks like this: "GPIB0::5::INSTR". */
/* To use the RS-232 interface using COM1 port, change it to "ASRL1::INSTR" */
/* address format */