Operator`s manual

Signametrics 24
Private Sub ReadBotton_Click() 'Read Botton Click action.
Dim i As Long 'Any time this botton is pressed
Dim dReading As Double 'the DMM takes a reading and displays it.
i = DMMRead(nDmm, dReading) 'Take a reading
TextReading.Text = dReading 'display it in a Text box.
End Sub
5.4 Windows DLL Default Modes and Parameters
After initialization, the Windows DLL default modes and parameters on your DMM are set up as follows:
 Auto ranging: Off
 Function: DC Volts
 Range: 240V
 Relative: Off
 Measurement Rate: 2rps
5.5 Using the DLL with LabWindows/CVI
When using the SM2060 DLL with LabWindows/CVI, you should read the LabWin.txt file included with the
software diskette.
An example application of SM2060 DLL calls from LabWindows/CVI ® is shown below. It
contains functions measure_ohms() and measure_vdc(), with sample calls to the SM2060.
NOTE: Although these measurement functions use LabWindows/CVI® and the LabWindows/CVI(R)
Test Executive, they are not necessarily coded to LabWindows® instrument driver standards.
/* function: measure_ohms, purpose: measure 2-wire ohms */
int measure_ohms(double OHMreading) {
short ret, i;
DMMSetFunctions (0, OHMS2W);
DMMSetAutoRange (0, TRUE);
/* to settle auto-range and function changes ignore three readings */
for( i = 0 ; i < 4 ; i++ ) ret = DMMReadNorm (0, & OHMreading);
return ret;
}
/* function: measure_vdc, purpose: measure DC Volts */
int measure_vdc(double Vreading) {
short ret, i;
DMMSetFunctions (0, VDC);
DMMSetAutoRange (0, TRUE);
/* to settle auto-range and function changes ignore three readings */
for( i = 0 ; i < 4 ; i++ ) ret = DMMReadNorm (0, &Vreading);
return ret; }
5.6 Windows Command Language
The following section contains detailed descriptions of each function of the Windows command language. Those
commands that pertain to only the SM2060 are indicated. Most functions return an error code. The code can either
be retrieved as a string using DMMErrString function, or looked up in the SMU2060.H header file. The
DMMUser.H file contains all the pertinent definitions for the DMM ranges functions etc. The following description
for the various functions is based on “C” function declarations. Keep in mind that the Windows DLL containing
these functions assumes all int values to be windows 32bit integers (corresponds to VisualBasic long type). TRUE
is 1 and FALSE is 0 (which is also different from VisualBasic where True is –1 and False is 0).
Grayed out functions are either, untested or unimplemented.