Operator`s manual

Signametrics 128
DMMSetCJTemp
SMU2060  SMU2064 
Description Set cold junction temperature for thermocouple measurement.
#include "SMU2060.h"
int DMMSetCJTemp(int nDmm, double dTemp)
Remarks This function sets the cold junction temperature 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 simply entering this value using this function. Another is by
measuring using a temperture sensor located at the connection point. dTemp must be
entered using the currently set temperature units. See DMMSetTempUnits function for
details.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
dTemp
double The cold junction temperature. Must be set between 0
o
C and
50
o
C or the corresponding
o
F.
Return Value The return value is one of the following constants.
Value
Meaning
DMM_OKAY
Operation successfully terminated
Negative Value
Error code.
Example DMMSetCJTemp(0, 22.5);
DMMSetCompThreshold
SMU2060  SMU2064 
Description Set the Threshold DAC level.
#include "SMU2060.h"
#include "USBDMMUser.h"
int DMMSetCompThreshold(int nDmm, double ldThreshold)
Remarks This function sets the output of the Threshold DAC. To use this function, the DMM must
be in AC volts. This function sets the detection threshold of the AC comparator. It is
compared by the comparator to the AC coupled input voltage. This function efffects the
following functions: Totalizer, Frequency counter, Period, Pulse width and Duty Cycle
measurements. ldThreshold range is determined by the selected ACV range. For instance,
when the 240 V AC range is selected, the allowed range of ldThreshold is –500 V to
+500 V. See the specification section for more details.
Parameter
Type/Description