Operator`s manual

Signametrics 102
DMM_OKAY
Operation successfully terminated
Positive value > 100
Warning code.
Negative value
Error code.
Example double Buffer[3000];
DMMSetAperture(0, APR_625us);
DMMSetReadInterval(0, 0.0); // Must be zero to use this function
DMMLongTrigger(0, 100, 30, 0.01 ); //expect 100 triggers, take 30 samples
// for each trigger, space samples by 10ms.
for(i=0 ; i < 3000 ; i++){ // read a total of iTrigCnt * iSampl samples.
while( ! DMMLongTrigRead(0, &r)); // Wait and read 3000 samples
Buffer[i] = r ;
}
DMMLongTrigRead
SMU2060  SMU2064  SMU2064-R 
Description Read samples generated by DMMLongTrigger operation. Available with Option ‘R’
#include "SMU2060.h"
int DMMLongTrigRead(int nDmm, double * lpdReading)
Remarks This function does two things, it checks for the availability of a sample resulting from a
DMMLongTrigger operation, as well as reading it. If a sample is not ready a FALSE (0)
is retunred, if it is available it returns TRUE (1) as well as save the sample at a location
pointed to by lpdReading. Therefore, when ready is indicated the reading must be read
from this location and saved in a buffer. Failing to do so will result in this value being
overwritten by a subsequent sample. Use a tight loop to check for samples availability
and saving the sample at a safe location. All triggered samples must be read using this
function. The total number of samples is equal to iTrigCnt times iSampl. Look up these
parameters in the DMMLongTrigger() description above.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
lpdReading
double * The location at which the reading is saved when TRUE is
returned.
Return Value The return value is one of the following constants.
Value
Meaning
TRUE
A sample is ready. It is located at location lpdReading
FALSE
Not ready. A reading is available yet.
Positive value
Warning code
Negative value
Error code.
Example double Buffer[3000];
DMMLongTrigger(0, 100, 30, 0.01 ); //expect 100 trigger pulses, take 30 samples
// for each trigger, space samples by 10ms.