Operator`s manual

25 Signametrics
DMMCalibrate
Description Internally calibrate the DMM.
#include "SMU2060.H"
int DMMCalibrate(int nDmm)
Remarks This function performs self calibration of the various components of the DMM, as well
as an extensive self test. At the end of this operation it returns the DMM to the current
operating mode. Using this function periodically, or when the DMM internal temperature
varies, will enhance the accuracy of the DMM. Using this function does not remove the
requirement to perform periodic external calibration.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
Return Value The return value is one of the following constants.
Value
Meaning
DMM_OKAY
DMM is OK.
Negative Value
Error
Example status = DMMCalibrate(0); /* a quick internal cal.*/
Comments This performs an internal DMM calibration and is the same as the S-Cal command in the
VB Control Panel. It is not related to the external calibration represented in the
SM60CAL.DAT file.
DMMCleanRelay
Description Service function that cleans specified relay.
#include "SMU2060.H"
int DMMCleanRelay(int nDmm, int iRelay, int iCycles)
Remarks This function cleans iRelay by vibrating the contact iCycles times. This function is useful
for removing oxides and other deposits from the relay contacts. DC Current
measurements are particularly sensitive to K2 contact resistance and therefore should be
cleaned periodically. It is also useful for making sound in computer without a speaker.
Parameter
Type/Description
iRelay
int The relay to clean. 1 for K2, 2 for K2 and 3 for K3.
iCycles
int The number of times the relay contact is shaken. 1 to 1000.
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
Return Value Integer error code..