DCA5-20PC-11-DC4-BS-C Murata Power Solutions Inc, DCA5-20PC-11-DC4-BS-C Datasheet - Page 5

• Manufacturer Part Number: DCA5-20PC-11-DC4-BS-C
• Description: DC Ammeter 1200A Ext. Shunt
• Manufacturer: Murata Power Solutions Inc

Specifications of DCA5-20PC-11-DC4-BS-C

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
8. Operation With 100mV Shunts: Many DCA5-20PC Series ammeters
9. Noisy Power Supplies: Some power supplies contain high-frequency
PANEL INSTALLATION
All connections and modifi cations must be made after the ammeter
is securely attached to the panel, with all load and supply voltages
de-energized (off).
The installed wire-positions should be such that minimal forces are applied
to TB1, TB2, and the ammeter itself. In high-vibration environments, the
use of wiring strain-reliefs is recommended.
To insure a secure panel-mount installation, MPS recommends using the
DMS-BZL4-C (with sealing gasket) bezel assembly supplied with each
can also operate with 100mV shunts. This is due to the fact that when
they are driven by a 100mV input, the display readings are double
those of a 50mV input. However, a 50mV shunt cannot be used in
a 100mV application because its maximum current rating will be
exceeded.
For our customer’s convenience, DATEL offers a series of 50mV and
100mV chassis-mount dc shunts that can be used with DCA5-20PC
ammeters. Part numbers for accessory shunts can be found in the
Ordering Information section. A data sheet describing these shunts is
available at www.datel.com.
Table 1 indicates the obtainable readings of the seven DCA5-20PC
models that can be operated with 100mV shunts. Be sure to enable the
correct decimal point (see decimal point selection instructions).
switching devices that may conduct and/or radiate signifi cant noise
onto the low-level 50/100mV shunt signal. Even though the DCA5-
20PC incorporates built-in fi ltering at its shunt input, some portion of
this noise may be amplifi ed and subsequently measured by the DCA5-
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Step 1.
2
Step 2.
www.murata-ps.com/dpm
Figure 7. Panel Installation
Step 3.
ammeter. See the Mechanical Specifi cations section for detailed panel
cutout and ammeter dimensions.
Following the four-step sequence shown in Figure 7 below, being careful
not to apply excessive force or twisting motions, insert the ammeter into
the panel opening. When using the DMS-BZL4-C’s sealing gasket, make
sure it is positioned between the ammeter’s fl ange and the panel’s front
surface. Be sure to use and securely tighten all four screws supplied with
the bezel assembly.
4
Model
DCA5-20PC-1
DCA5-20PC-2
DCA5-20PC-3
DCA5-20PC-4
DCA5-20PC-7
DCA5-20PC-8
DCA5-20PC-9
20PC’s sensitive circuitry. The amplifi ed noise introduces errors that are
particularly noticeable at zero load current (i.e., the ammeter may not
display a relatively steady “000” reading).
Connecting an external, unpolarized capacitor across TB1’s “+” and
“–” inputs, and/or across the shunt’s 50mV output terminals, can help
reduce noise-related display errors. In certain situations, the use of
twisted pair or shield wiring may be required. As a general rule, avoid
using excessively long leads between the ammeter and the shunt.
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3
With respective decimal point enabled
Table 1. 100mV Shunt Readings
50mV & 100mV Input, LED-Display,
03 May 2010 MPM_DCA5-20PC.B06 Page 5 of 6
DCA5-20PC Series
100mV Shunt Readings
10.00A/100.0A/1000A
1.999A/19.99A/199.9A/1999A
60.0A/600A
150.0A/1500A
50.0A/500A
800A
1200A
Subminiature DC Ammeters
Step 4.
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