Operator`s manual

Signametrics 110
Remarks Read the cold junction temperature sensor for subsequent thermocouple measurements.
When measuring temperature using thermocouples it is necessary to establish a reference
or cold junction temperature. This is the temperature at which the thermocouple wires are
connected to the DMM or to the switching card’s cooper wires. One way to do this is by
measuring the cold junction sensor using this function. DMMReadCJTemp() function
reads the sensor output voltage (0 to +/-3.3V), and converts it to cold junction
temperature using the built in equation Temp = b + (Vcjs – a)/m. The default values of a,
b and m are designed specifically for the temperature sensor of the SM40T terminal
block. The value of the cold junction temperature is saved internally for subsequent
thermocouple measurements as well as return at the location pointed to by lpdTemp.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
lpdTemp
double * Points to the location to hold the temperature.
Return Value The return value is one of the following constants.
Value
Meaning
DMM_OKAY
Operation successfully terminated
Negative Value
Error code.
Example DMMReadCJTemp(0, &temp);
DMMReadCrestFactor
SMU2060  SMU2064 
Description Return ACV signal’s Crest Factor.
#include "SMU2060.h"
int DMMReadCrestFactor(int nDmm, double *lpdResult)
Remarks To use this function the DMM must be in ACV measurement function, and a valid range
must be selected. A double-precision floating-point Crest Factor is stored in the location
pointed to by lpdResult. This measurement is a composite function, utilizing several sub
functions, and could take over 10 seconds to perform. See the Crest Factor measurement
section of the manual for more detail.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
lpdResult
double * Points to the location to hold the Crest Factor.