Signametrics
100
Remarks
This
Secondary
function sets the DC voltage source to
ldVolts
. The DMM must be in
C
ction to execute properly. When the DMM is in
VDC_SRC
operation, and the
DMMSetDCVSource
is applied, reading the DMM
(DMMRead
or
DMMReadStr
) will return the measurement of the output voltage. This function acts on
n be accomplished by
selecting the ClosedLoop mode (
DMMSetSourceMode
). This mode engages the Trim
DAC, which augments the 12 bit DAC to produce 16 effective bits. In ClosedLoop
urce level is adjusted every time the DMM is read, making small corrections
equal to
ldVolts.
However, for the ClosedLoop mode to update the
read the DMM multiple times. Update rate should not
d Loop mode. The DMM reads voltages using the 33
Parame
VDC_SR
for this fun
the main 12 bit source DAC. If better accuracy is needed it ca
mode, the so
until the reading is
source level, it is necessary to
exceed 10 rps when using the Close
V range.
ter Type/Description
umbered starting with zero.
ldVolts
Return Value
nDmm
int
Identifies the DMM. DMMs are n
double FAR
DC voltage to be set. Can be –10.5 to 10.5 V
Integer error code.
Value Meaning
DMM_OKAY
Ope
lue
Erro
Example
double reading; int I;
urce to 1.25V
/ Closed loop mode
for(I=0;I<100;I++) DMMRead(0,&reading); // update 100 times
DMMSetExternalShunt
SMX2040
SM
2044
Description
ue of
rnal shunt
int
DMMSetExternalShunt(int
nDmm, double ldShunt)
Rem
condary
function sets the value of the external shunt resistor being used. The
ed in measurement functions such as Leakage and Extended
resistance, Synthesized resistance etc. It is available with S/W versions 1.75 or higher.
lue, such that 10,000.0 correxponds to a 10k
Ω
shunt.
Parame
ration successfully completed.
Negative Va
r code
DMMSetDCVSource(0, 1.25); // Set so
DMMSetSourceMode(0, CLOSED_LOOP); /
X2042
SMX
;
Set the val
the leakage function exte
#include "sm204032.h"
arks
This
Se
shunt value is utiliz
ldShunt
sets the shunt va
ter Type/Description
nDmm
int
Identifies the DMM. DMMs are numbered starting with zero.
ldShunt
double
Shunt resistance value. A value greater than zero and smaller
Return Value
Value
the 200e6 (200 Mega Ohms) is allowed.
Integer error code.
Meaning
DMM_OKAY
Operation successfully completed.
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