49
Signametrics
he Threshold DAC to 186.7 V. This value is the peak value of
The Threshold DAC can be set for a negative or positive voltage value. See Threshold DAC above for more details.
Example One: To monitor and capture the AC line for positive spikes which exceed 10% of the nominal 120 V
MS value, first select ACV 250 V range, than set t
R
2
). En le
talizer and read it periodically to get th
120 V RMS plus 10% (120V + 10%) X
ab the To
e number of
s excee d.
utilized to count
times this value wa
de
Example Two: Defects in coils, inductors, or transformers can be manifested as an increas
timulated with a charged apacitor
ed decay, or greatly
attenuated resonance when s
c
. The Totalizer function can be
ransition
ow
t
s above a preset Threshold voltage as in the Figure 4-15 bel
.
Figure 4-15. Testing inductor Q by counting the number of transitions of decaying resonance
4.15 Sourcing Functions (SM20
.
64)
ions. All of the
oa ng with
urcing with
o connect several SM2064 units in parallel for increased
he sour
The
to fo a 16 b compo
AC
lution. For
lectin
y the 12-bit
s u
only.
+
, and the
V,
Ω
termina
he SM2064 has a fully isolated bipolar DC voltage source. Two modes of operation are available: fast settling or
losed loop. In the ClosedLoop mode the DMM monitors the voltage source output, and updates it using the
sedLoop mode offers the best
. In the fast
bit DAC is used. Up to
±
10.0 V can be sourced, with 10 mA
The SM2064 adds a number of sourcing functions, giving greater versatility for a variety of applicat
, DC, V C, IDC are isolated (fl
available sources V
A
,
ti
respect to the PC chassis). This allows so
a significant common mode voltage as well as the ability t
DC current, or in series for increased DC voltage.
tal-to-analog converters (DACs) are used for t
ce functions, a 12-bit DAC, and a Trim DAC.
Two digi
last augments the 12-bit DAC
rm
it
site D
and adds an additional 8 bits of reso
nction
otherwise onl
fu
s requiring high precision, use both DACs by se
g the ClosedLoop mode,
tilized. DCI source is limited to the 12-bit DAC
DAC i
All three source functions use the
V,
Ω
-
ls of the SM2064.
4.15.1 DC Voltage Source
T
c
composite 16 bit DAC, at a rate proportional to the set measurement rate. The Clo
accuracy and resolution. An aperture of 160ms or higher recommended for the ClosedLoop mode
settling mode, no adjustments are made and the 12-
maximum drive. The output source resistance of the DCV source is approximately 220
Ω
. See Figure 4-15 for
connection.