Operator`s manual

Signametrics 138
DMMSetReference
SMU2060  SMU2064 
Description Set measurement reference value for deviation measurements.
#include "SMU2060.h"
int DMMSetReference(int nDmm, double dRef)
Remarks This function sets a measurement reference. Unlike DMMSetRelative, which uses the
current measurement as a reference, DMMSetReference provides the facility to set the
reference to dRef. Once set, it is subtracted or divided from subsequent measurements. It
effects both, normal measurements and percent diviation measurements using
DMMRead and DMMGetDeviation functions respectively. The latter can be used for
production sorting. For instance, to reject 1.00k reistors that diviate by 0.5%, set the
reference to 1,000.0. While measuring resistance, ascertain that absolute values returned
by DMMGetDeviation are smaller than 0.5 (0.5%). To cancell the effect of this fuction,
set relative to FALSE using the DMMSetRelative function.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
dRef
double Reference value.
Return Value Integer error code..
Value
Meaning
DMM_OKAY
Operation successfully completed.
Negative Value
Error code
Example double error;
int status = DMMSetReferebce(0, 1000.0); // set 1k reference
DMMSetRelative
SMU2060  SMU2064 
Description Set the DMM relative reading mode for the present function
#include "SMU2060.h"
int DMMSetRelative(int nDmm, int bRelative)
Remarks This function selects relative or absolute reading mode for the DMM. If the bRelative
parameter value is TRUE (1), the DMM will change to relative reading mode. If
FALSE, the DMM will change to absolute reading mode.