HP E1418A, User Manual

Page: 167 / 192

resets until the store is complete. You can use the *OPC? query as described
on page 56, if needed.
Return the
Module to Use
If you have changed the position of the Cal Store Enable Jumper (as
described on page 159) and you wish to prevent writing calibration
constants to non-volatile memory, set the jumper to the SECURE position.
Example Program
The following program, written in ANSI C illustrates a full calibration of all
channels for both voltage and resistance. The internal calibration resistor is
used. The SCPI drivers disk contains a calibration example file. This
example uses function calls to the HP VISA Transition Library for I/O
operations. Page 39 provides more details about this library.
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/** FUNCTION PROTOTYPES **/
void main (void);
void err_handler(ViSession vi, ViStatus x);
/* VTL error routine */
void sys_err(ViSession resource); /* Checks for SCPI programming errors */
void pause(); /* Waits for a keystroke to continue program execution */
int config_check (); /* Checks and reports the module configuration */
/* returns the number of channels in module */
float get_voltage (); /* Obtains the measured voltage */
float get_resistance (); /* Obtains the measured resistance */
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void main (void)
{
char cal_point [5],int_ext [4];
int num_chan,result,compare,i,condition [4];
float meas_volt,meas_res;
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/*** VOLTAGE OUTPUT ADJUSTMENT ***/
for
(i=1;i<n1;i++)
{
result = 0;
while (result < 1)
{
err=viPrintf(dac, “CAL%d:CONF:VOLT?\n”,i); /* Configure for calibration */
if(err < VI_SUCCESS) err_handler(dac, err);
err=viScanf(dac, “%d”, &result);
/* Enter integer returned */
/* returns a 1 when ready to calibrate */
if(err < VI_SUCCESS) err_handler(dac, err);
}
result = 1;
166 Voltage/Current Output Adjustment Appendix D