Operator`s manual

101 Signametrics
Parameter Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
Return Value Integer TRUE, FALSE or an error code.
Value
Meaning
TRUE
Relative mode is selected.
FALSE
Relative mode is not selected.
Negative Value
Error code
Example int rel = DMMIsRelative(0);
DMMLongTrigger
SMU2060  SMU2064  SMU2064-R 
Description Arm DMM for long trigger operation. Only available with Option ‘R’
#include "SMU2060.h"
int DMMLongTrigger(int nDmm, int iTrigCnt, int iSampl, double dTd)
Remarks This function sets up the DMM for hardware trigger operation. The trigger source can be
from either the front panel (DIN-7 connector) or from the selected PXI trigger bus. In
response to this command the DMM enters a wait state for trigger. In response to a
positive trigger edge, it takes iSampl samples, spaced by dTd seconds from each other.
This is repeated for a total of iTrigCnt trigger events. All measurements are sent back
from the DMM to the PCI bus as soon as they become available. Failure to retrieve all
samples sufficiently fast will result in communication error. The value of iTrigCnt and
iSampl must be between 1 and 50,000. The time delay between samples, dTd, should be
set to a value that is greater than the set aperture and up to 3,600s. All samples must be
read using the DMMLongTrigRead() function. The total number of samples is iTrigCnt
* iSampl. The minimum trigger period must be greater than the set aperture or dTd.
This trigger mode is usable for VDC, VAC, Ohms, IAC IDC and Leakage. The DMM
Read Interval must be set to zero (default) during this operation. Aperture must be set
between 160ms and 2.5us. Use the DMMLongTrigRead() too monitor completion of
this operation, as sell as read the samples.
Parameter
Type/Description
nDmm
int Identifies the DMM. DMMs are numbered starting with zero.
iTrigCnt
int The number of trigger events the DMM will respond to. This
number must be between 1 and 50,000.
iSampl
int The number of samples the DMM takes following each trigger
event. This number must be between 1 and 50,000.
dTd
double Sample to sample delay time in seconds.
Return Value The return value is one of the following constants.
Value
Meaning