Murata DCA-20PC Series Manual

www.murata-ps.com
FEATURES
„
Built-in shunts for digitally measuring dc currents
from 200uA to 20Al
„
Functionally complete – no additional components
required
„
Wide power supply inputs:
5 to 40Vdc for 5V/12/24V/28V applications
36-75V option for telecom supplies
„
8-36Vdc Isolated-supply models for high-side shunts
„
20mV internal shunt minimizes power loss
„
Includes load connections for easy 3 or 4-wire
operation
„
High resolution; Factory calibrated to ±0.1% accuracy
„
Large, easy-to-read, LED display with 0.37" (9.4mm)
high digits
„
Available with red, blue or green LED displays
„
Small 1.38˝ x 0.88˝ x 1.0˝ package
For full details go to
www.murata-ps.com/rohs
Murata Power Solutions' new DCA-20PC Series are the fi rst digital dc ammeters to include built-in
shunts for measuring dc currents up to 20A. Six ranges provide for precision measurement of
dc currents from 200uA to 20A. These ammeters are 100% self-contained; no calibration or
user-supplied components are required—they even include terminal blocks for your external load
circuit, a feature that enables simple 3-wire operation!
for cost-sensitive applications, and 8-36V isolated-supply models for high side or fl oating shunt
applications. A versatile power supply design accommodates all popular supply voltages from 5 to
75Vdc. Reverse-polarity-protected supply inputs ensure trouble free installation. And, because many
dc ammeters are installed in battery backup applications, power consumption is typically below 1
Watt for 8-36V models, and below 75mW for 5-40V models. To further reduce overall power con-
sumption, the voltage dropped across its built-in series shunt is only 20mV!
rugged packages that feature a large, 0.37˝/9.4mm high, LED display. A built-in, high-contrast
color fi lter ensures that legibility is not compromised: the display can be easily read at distances
up to 15 feet (5 meters). Available LED-display colors include brilliant blue, bright green, and
standard red.
consumption, and no-hassle 3-wire installation make DCA-20PC Series the ideal choice for all
your 200uA to 20A ammeter-applications.
LED DISPLAY
–
INPUT
AMPLIFIER
+
BUILT-IN
SHUNT
– +
1
2
*
TB1
**
–SHUNT +SHUNT
(–V)
Figure 1. Simplifi ed Schematic
Figure 1. DMS-PS-CM Series Simplifi ed Schematic
www.murata-ps.com/dpm
Two shunt-confi gurations are offered: grounded-shunt ("low side"), 5-40V-powered models
DCA-20PC Series ammeters are housed in subminiature, 1.38˝ x 0.88˝ (35mm x 22mm),
Built-in shunts, Precision electronics, miniature size, wide power supply inputs, low power
+5V
A/D
CONVERTER
–5V
*
SIGNAL
GROUND
Open on isolated-supply models
Applies to isolated-supply models only
LOAD (+)
+
–
EXTERNAL
LOAD
+
–
EXTERNAL
DC SUPPLY
DCA-20PC Series
LED Display, Subminiature DC Ammeters
with Built-In Shunts
POWER
CONVERTER
POWER
GROUND
3
1
2
2
1 2
TB2
**
+V –V
email: sales@murata-ps.com
23 Nov 2010 MPM_DCA-20PC.B05 Page 1 of 6