Operator`s manual

93 Signametrics
he
Parame
Remarks This Secondary function sets the AC peak voltage level for the AC based Capacitance
measurement function. It actually sets an internal register to ldVols rather than setting t
output level itself. This value is used on any of the AC Caps calibration and
measurement. Following setting of this function, it is necessary to perform open
calibration of the AC Capacitance ranges to be used. Since the DMM is optimized for the
defalut value, it is recommended not to use this function and keep the default 0.45V peak
value.
ter
Type/Description
nDmm
.
ldVolts
voltage to be set. Can be 0.1V to 5.0V
Return Value
Value
int Identifies the DMM. DMMs are numbered starting with zero
double Peak value of AC
Integer error code.
Meaning
DMM_O
alue
Erro
Example
DMMSetACCapsLevel(0, 0.35); // Set stimulus to 0.35V peak
DMMSetACVSource
SM2040  SM M2042 ;
Description Set the ACV so
#include "sm2
#include "User
lts, double ldFreq)
Remarks This Secondary ets the AC voltage source to RMS amplitude of ldVolts, and
the frequency to he DMM must be in VAC_SRC operation for this function to
properl operation, and the
etACV (DMMRead, DMMReadStr) will
e meas e output voltage. This function acts on the main 12 bit
AC. If cy is needed it can be accomplished by selecting the
s mode engages the Trim DAC, which
he
l the
urce
multi ceed 5
ges are available in
_SR ode is enabled, the
atically select the appropriate range.
KAY
Operation successfully completed.
Negative V
r code
2042  S
urce output level and frequency.
04032.h"
DMM.h"
int DMMSetACVSource(int nDmm, double ldVo
function s
ldFreq. T
execute
DMMS
y. When the DMM is in VAC_SRC
Source is applied, reading the DMM
return th
source D
urement of th
better accura
ClosedLoop mode (DMMSetSourceMode). Thi
augments the 12 bit DAC to produce 16 effective bits. In the ClosedLoop mode, t
source level is adjusted any time the DMM is read, making small corrections unti
reading is equal to ldVolts. However, for the ClosedLoop mode to update the so
hould not ex
level, it is necessary to read the DMM ple times. Update rate s
ent ran
rps when using the Closed Loop mode. Two ACV measurem
VAC C mode, the 3.3 V and the 330 mV. If the Autorange m
DMM will autom
Parameter Type/Description
nDmm
ldVolts
C RMS voltage to be set. Range: 0.05 to 7.25 V RMS
int Identifies the DMM. DMMs are numbered starting with zero.
double A
ldFreq
double DC voltage to be set. Range: 2 Hz to 76 kHz