Specifications

Signametrics 94
Remarks This Secondary function sets the AC peak voltage level for the AC based Capacitance
measurem sets an internal register to ldVols rather than setting the
output level itself. This value is used on any of the AC Caps calibration and
m t is necessary to perform open
calibration of the AC Capacitance ranges to be used. Since the DMM is optimized for the
al mmended not to use this function and keep the default 0.45V peak
value.
Parame
ent function. It actually
measure ent. Following setting of this function, i
defalut v ue, it is reco
ter
Type/Description
int Identifies the DMM. DMMs are numbered starting with zero.
nDmm
ldVolts
double Peak value of AC voltage to be set. Can be 0.1V to 5.0V
Value
Return Value Integer error code.
Meaning
OKAY
Operation succe
DMM_
ssfully completed.
DMMSetACVSource
SMX2040  SM
Description Set the ACV so
#include "sm20
#include "User
ldVolts, double FAR ldFreq)
Remarks This Secondary ets the AC voltage source to RMS amplitude of ldVolts, and
the frequency to ldFreq. The DMM must be in VAC_SRC operation for this function to
properl n VAC_SRC operation, and the
DMMSetACVSource is applied, reading the DMM (DMMRead, DMMReadStr) will
e meas e output voltage. This function acts on the main 12 bit
source DAC. If better accuracy is needed it can be accomplished by selecting the
adjusted any time the DMM is read, making small corrections until the
Volts. However, for the ClosedLoop mode to update the source
to read the DMM multiple times. Update rate should not exceed 5
o ACV measurement ranges are available in
V. If the Autorange mode is enabled, the
elect the appropriate range.
Parame
Negative Value
Error code
Example DMMSetACCapsLevel(0, 0.35); // Set source to 0.7V peak-to-peak
X2042  SMX2044 ;
urce output level and frequency.
4032.h"
DMM.h"
int DMMSetACVSource(int nDmm, double FAR
function s
execute y. When the DMM is i
return th urement of th
ClosedLoop mode (DMMSetSourceMode). This mode engages the Trim DAC, which
augments the 12 bit DAC to produce 16 effective bits. In the ClosedLoop mode, the
source level is
reading is equal to ld
level, it is necessary
rps when using the Closed Loop mode. Tw
VAC_SRC mode, the 3.3 V and the 330 m
DMM will automatically s
ter
Type/Description
zero.
ldVolts
double FAR AC RMS voltage to be set. Range: 0.05 to 7.25 V RMS
ldFreq
double FAR DC voltage to be set. Range: 2 Hz to 76 kHz
Return Value Integer error code.
nDmm
int Identifies the DMM. DMMs are numbered starting with
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