DCA-20PC-1-DC1-BL-C - Murata Power Solutions

Figure 1. Simpliﬁ ed Schematic

FEATURES



Built-in shunts for digitally measuring dc currents

from 200uA to 20A



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

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!

Two shunt-conﬁ gurations are offered: grounded-shunt (“low side”), 5-40V-powered models

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!

DCA-20PC Series ammeters are housed in subminiature, 1.38˝ x 0.88˝ (35mm x 22mm),

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.

Built-in shunts, Precision electronics, miniature size, wide power supply inputs, low power

consumption, and no-hassle 3-wire installation make DCA-20PC Series the ideal choice for all

your 200uA to 20A ammeter-applications.

A/D

CONVERTER

LED DISPLAY

INPUT

AMPLIFIER

POWER

CONVERTER

TB1

–5V

+5V

TB2

POWER

GROUND

SIGNAL

GROUND

Open on isolated-supply models

Applies to isolated-supply models only

–V+VLOAD (+)+SHUNT

BUILT-IN

SHUNT

–

–SHUNT

(–V)

–+

EXTERNAL

LOAD

EXTERNAL

DC SUPPLY

1212

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

DCA-20PC Series

LED Display, Subminiature DC Ammeters with Built-In Shunts

MPM_DCA-20PC.C01 Page 1 of 6

Performance/Functional Speciﬁ cations

Typical at TA = +25°C, unless otherwise noted.

Input Range:

Full-scale load current

1 = 199.9µA

2 = 1.999mA

3 = 19.99mA

4 = 199.9mA

5 = 1.999A

6 = 19.99A

DCA-20PC - 1 - DC1 - R L - C

Accessories:

DMS-20-CP Panel Cutout Punch

➀ The noted full-scale values are the external load currents that the ammeter is

designed to measure. This current enters TB-1 (-SHUNT), passes through the am-

meter’s built-in shunt and exits via TB1-2 (+SHUNT). For all models, this same full-

scale load current can also be routed, if the user so chooses, through TB2-1 and

TB2-2 (connection to positive rail of power supply). See detailed wiring diagrams.

Measuring positive and negative currents (bipolar operation): In applications

where both positive and negative currents must be measured, Murata Power Solu-

tions recommends using ‘-DC4’ 8-36V isolated supply models. Negative current

ﬂ ow is denoted by the illumination of the display’s negative (-) sign; the absence

of a negative sign implies positive current ﬂ ow. Contact MPS if you have any ques-

tions regarding bipolar operation of DCA-20PC ammeters.

➁ For all models, the application of 1.5 times the rated full-scale load current is

permissible as long as this overcurrent condition does not exceed 6 seconds and

occurs no more than once in a 60 second interval (10% duty cycle).

➂ Breakdown (isolation) voltage applies only to ‘-DC4’ isolated-power models. Break-

down voltage is tested with TB1-1 tied to TB1-2 (-SHUNT shorted to +SHUNT),

and TB2-1, TB2-2, and TB2-3 all tied together (+V shorted to -V). 500Vdc is then

applied between the two shorted terminal-block pairs; the maximum permissible

leakage current is 5uA.

➃ Zero reading is measured with TB1-1 (-SHUNT) shorted to TB1-2 (+SHUNT).

➄ The Operating power supply voltage is applied to TB2-1-2 (+V) and TB2-3 (-V)

on ‘-DC4’ models, and to TB1-1 (-SHUNT) and TB2-2 (+V) on ‘-DC1’ models. On

all models, TB2-1 and TB2-2 are internally tied together (+V). Operating supply

current is the current which powers the meter’s analog and digital circuits; it is

measured with zero load-current passing through the ammeter’s built-in shunt

(i.e., with the display reading “000” and one decimal point enabled).

On 5-40Vdc powered (‘-DC1’), grounded-shunt models, the ammeter’s operating

supply current enters TB1-1 (-Shunt) but is not included in the displayed reading

(i.e., it does not pass through the built-in shunt).

A DMS-BZL4-C bezel assembly with sealing gasket is

supplied with each ammeter.

Full Scale Load Current ➀Min. Typ. Max. Units

DCA-20PC-1 – – 199.9 µAdc

DCA-20PC-2 – – 1.999 mAdc

DCA-20PC-3 – – 19.99 mAdc

DCA-20PC-4 – – 199.9 mAdc

DCA-20PC-5 – – 1.999 Adc

DCA-20PC-6 – – 19.99 Adc

Overcurrent Rating (<6 sec.) ➁1.5x rated full-scale load current

Internal Shunt Resistance

DCA-20PC-1 – – 100 Ohms

DCA-20PC-2 – – 10 Ohms

DCA-20PC-3 – – 1.0 Ohm

DCA-20PC-4 – – 0.1 Ohm

DCA-20PC-5 – – 0.01 Ohm

DCA-20PC-6 – – 0.001 Ohm

Shunt Input to Power Supply Isolation ➂

DCA-20PC-X-DC4 models only 500 – – Volts

Performance

Sampling Rate 2.5 reading per second

Accuracy ±0.15%FS

Zero-Current Reading ➃“–001” “000” “001” Counts

Temperature Drift (0 = +60°C) – ±0.2 ±0.4 Cnts/°C

Operating Supply Voltage (TB2 Terminals 1, 2 and 3) ➄

DCA-20PC-X-DC1-XX +5.0 – +40 Vdc

DCA-20PC-X-DC4-XX +8 – +36 Vdc

Operating Supply Current (TB2 Terminals 1, 2 and 3) ➄

DCA-20PC-X-DC1-XX (@ 5-40V) – 10 15 mAdc

DCA-20PC-X-DC4-XX (@ 8V) – 100 150 mAdc

DCA-20PC-X-DC4-XX (@ 36V) – 25 40 mAdc

TB1 and TB2 Terminal Blocks

Wire Size 12-20AWG, (solid)

14-20AWG, (stranded) copper wire

Insulation Strip Length 0.250 inches

Screw Tightening Torque 4.4 pound/inches (0.5Nm)

Rated Current 20A with 12AWG solid copper wire;

15A with 14AWG solid or stranded

copper wire

Display

Display Type and Size 3½ digit, 0.37"/9.4mm high red, blue or

green LED

Overrange Indication "–1_ _ _" for negative Vin

"1_ _ _" for positive Vin

Display Reading/Decimal Point Model dependent

Physical/Environmental

Operating Temperature 0 – +60 °C

Storage Temperature –20 – +75 °C

Add -C for RoHS

Ordering Information

Physical/Environmental (continued)

Humidity (non-condensing) 0 – 85 %

Case Material Polycarbonate

Dimensions 1.38"W x 0.88" x 1.0" nominal

Weight 0.6 ounces (17 grams)

Power Supply:

DC1 = +5-40Vdc, non-isolated power

(available with -RL, -BL, or -PGL LEDs)

DC4 = +8-36Vdc, isolated power

(available with -RL, -BS, or -GS LEDs)

LED Color:

BL = Low-Power Blue

BS = Super Blue

GS = Standard Green

PGL = Low-Power Green

RL = Low-Power Red

See www.murata-ps.com/dpm-availability for model-speciﬁ c availability.

www.murata-ps.com/support

DCA-20PC Series

LED Display, Subminiature DC Ammeters with Built-In Shunts

MPM_DCA-20PC.C01 Page 2 of 6

TECHNICAL NOTES

Figure 2A. Low-Side Shunt Connections for "-DC1"

5-40Vdc Non-Isolated Supply Models

Figure 3. Low-Side Shunt Connections for "-DC1"

Models Modiﬁ ed for 36-75Vdc Non-Isolated Power

(See Technical Note 6)

To ensure safe and reliable operation, DCA-20PC dc ammeters

must be installed and serviced by qualiﬁ ed technical personnel.

DC ammeter applications can expose a user to potentially lethal

currents and voltages. Power and load connections must be made

with all associated power sources de-energized. Contact Murata

Power Solutions if you have any questions regarding installation

or operation of any of our digital instruments.

DCA-20PC ammeters’ power supply and shunt terminals are not

internally fused. Therefore, the supply wires connected to both the

meter and the load must be fused according to the maximum current

rating (or lower) of the wire gauge used, in accordance with applicable

regulatory codes.

Wiring Insulation should be stripped to within +/-10% of the stated

dimensions. All wires must be inserted into the terminal block openings

such that the screw terminal does not pinch any insulation. After ﬁ nal

assembly, inspect all terminal block connections for shorts between

adjacent conductors; this step is particularly important when using

stranded wire.

3. Terminal Block Torque Ratings and Wire Size: It is important to

tighten all TB1 and TB2 screw-terminals to their torque speciﬁ cation

of 4.4 pound-inches (0.5Nm). Proper tightening will minimize thermal/

electrical losses and ensure reliable operation. Under severe operation

conditions (for example, vibration, high continuous load currents, and

wide variations in ambient temperature), 25% over-tightening is permis-

sible. Applications subject to vibration should use stranded wire.

Proper terminal block torque is extremely important on all 20A models

(DCA-20PC-6 part numbers). Loose connections can overheat, thereby

posing a potential ﬁ re hazard to the terminal blocks, the load and

supply wiring, the ammeters themselves, and nearby equipment. 20A

models must use either 14AWG stranded or 12 AWG solid copper

wires only. However, in some applications, regulations can limit the

continuous current ﬂ owing in 14AWG solid or stranded copper wire to

15A maximum.

4. High-Side versus Low-Side Shunts: Incorrect shunt connections

are one of the most common problems encountered when applying

digital dc-ammeters. Incorrect shunt connections can cause permanent

damage to the ammeter and its associated equipment.

1. Calibration: DCA-20PC ammeters are factory calibrated using a high-

precision current source. Under normal indoor operating conditions,

periodic recalibration is not necessary. The calibration potentiometer,

located on the back of the ammeter, is a ¾ turn type; do not force its

adjustment screw past the two end stops. If recalibration is necessary,

it must be performed by qualiﬁ ed personnel. Calibration is performed

by applying a precision current source to TB1’s -SHUNT and +SHUNT

terminals. For best results, use a load current that is approximately

95% of the ammeter’s full-scale rating.

The calibration current source and power supply inputs must be con-

nected per the appropriate model-speciﬁ c wiring diagram shown later

in this data sheet. Using an insulated slotted tool, adjust the calibra-

tion potentiometer until the display is within ±1 count of the desired

reading. Please note, the potentiometer provides an adjustment range

of approximately ±1%. Contact Murata Power Solutions if additional

information is required regarding calibration or setup of DCA-20PC

ammeters.

2. Wiring and Fusing: Power supply (TB2) and input (TB1) wiring must be

rated for the electrical and environmental conditions under which the

ammeters will be operated. They must also comply with any regula-

tory or application-mandated requirements pertaining to the user’s

installation. Connections to DCA-20PC ammeters must be made with

all power sources de-energized. Refer to the Functional Speciﬁ cations

section for detailed wire type and wire gauge information.

CAL

DCA-20PC-X-DC1-XX

SHUNT

MUST BE

IN LOW

SIDE

TB2-1 & TB2-2

INTERNALLY

SHORTED

TB2

TB1

–SHUNT

(–V)

–

LOAD CURRENT

LOAD

DC SUPPLY

5-40Vdc

+SHUNT

J3 MUST BE

INSTALLED

(FACTORY

SETTING

FOR 5-40Vdc

SUPPLIES)

CAL

DCA-20PC-X-DC1-XX

SHUNT

MUST BE

IN LOW

SIDE

TB2-1 & TB2-2

INTERNALLY

SHORTED

TB2

TB1

–SHUNT

(–V)

–

LOAD CURRENT

LOAD

DC SUPPLY #1

5-40Vdc

+SHUNT

J3 MUST BE

INSTALLED

(FACTORY

SETTING

FOR 5-40Vdc

SUPPLIES)

–+

DC SUPPLY #2

(For Load Only)

CAL

DCA-20PC-X-DC1-XX

SHUNT

MUST BE

IN LOW

SIDE

TB2-1 & TB2-2

INTERNALLY

SHORTED

REMOVE J3

FOR 36-75Vdc

SUPPLIES

TB2

TB1

–

LOAD

DC SUPPLY

36-75Vdc

–SHUNT

(–V) +V

LOAD CURRENT

+SHUNT

Figure 2B. Low-Side Shunt Connections for "-DC1"

Models using Two Power Supplies

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DCA-20PC Series

LED Display, Subminiature DC Ammeters with Built-In Shunts

MPM_DCA-20PC.C01 Page 3 of 6

TECHNICAL NOTES

Figure 4. High-Side Shunt Connections for "-DC4"

8-36Vdc Isolated-Power Models

Figure 5. Using "-DC4" Isolated-Power Models to Maintain Isolation

Between Two Power Supplies

Figure 6. Using "-DC4" Isolated-Power Models

in Low-Side Shunt Applications

Low-side shunts: Applications that employ a single power supply to

power both the load and the ammeter, and the external shunt is located

in the negative side of the supply (commonly referred to as “low side” or

“grounded shunt”) should use ‘-DC1’ non-isolated power DCA-20PC Series

ammeters. Figures 2 and 3 depict typical low-side shunt connections.

High-side shunts: ‘-DC4’ 8-36Vdc isolated-power models must be

used in all applications that employ a single power supply to power

both the load and the ammeter and the shunt is located in the high side

(positive terminal) of the power supply. Figures 4 and 5 depict typical

high-side shunt connections. As shown in Figure 5, ‘-DC4’ isolated-

power models can also be used in applications where one supply

powers the ammeter and a second supply powers the load, but the two

supply-grounds cannot be tied together. ‘-DC4’ models include a built-in

dc/dc converter to provide a minimum 500Vdc isolation between the

shunt (TB1) and power supply (TB2) inputs.

5. Replacing Analog Panel Meters: DCA-20PC ammeters can be used

as replacements for analog panel meters if a suitable dc voltage

is available for powering the ammeter. In retroﬁ t applications, it is

important to determine the shunt’s electrical conﬁ guration (i.e., high or

low side). If any doubt exists as to the shunt’s location, use only ‘-DC4’

isolated-supply models. All rewiring must be performed with the load

and power supply de-energized.

6. Operation With 36 to 75Vdc Power: As shipped, all ‘-DC1’ models’

rated operating supply range is +5 to +40Vdc. However, ‘-DC1’

models can be user conﬁ gured for 36 to 75Vdc operation by removing

(opening) jumper J3. Please note that this modiﬁ cation can only be

performed on ‘-DC1’ power models. Also, all ‘-DC1’ models – including

those that have been modiﬁ ed for 36-75Vdc operation – can only be

connected in low-side, grounded-shunt applications. See Figure 3 for

7. Decimal Points: DCA-20PC ammeters’ decimal points are factory con-

ﬁ gured for the respective full-scale input range. However, the decimal

points serve as placeholders only, they have no affect on the ammeter’s

displayed accuracy or resolution.

CAL

123

TB2

TB1

–

–V

LOAD

TB2-1 AND TB2-2

ARE INTERNALLY

SHORTED

DCA-20PC-X-DC4-XX

SHUNT IS IN

HIGH SIDE

–SHUNT +V

LOAD CURRENT

+SHUNT

DC SUPPLY

8-36Vdc

CAL

123

TB2

TB1

–

–V

LOAD

DC SUPPLY

8-36Vdc

TB2-1 AND TB2-2

ARE INTERNALLY

SHORTED

DCA-20PC-X-DC4-XX

SHUNT IS IN

LOW SIDE

–SHUNT +V

LOAD CURRENT

+SHUNT

CAL

123

TB2

TB1

–

–V+V

LOAD

CURRENT

LOAD DC SUPPLY #1

8-36Vdc

+SHUNT–SHUNT

TB2-1 AND TB2-2

ARE INTERNALLY

SHORTED

DCA-20PC-X-DC4-XX

DC SUPPLY

SHUNT IS IN

HIGH SIDE

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DCA-20PC Series

LED Display, Subminiature DC Ammeters with Built-In Shunts

MPM_DCA-20PC.C01 Page 4 of 6

TECHNICAL NOTES

PANEL INSTALLATION

Step 1. Step 2. Step 3. Step 4.

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 (with sealing gasket) bezel assembly supplied with each

Figure 8. Panel Installation

ammeter. See the Mechanical Speciﬁ cations section for detailed panel

cutout and ammeter dimensions.

Following the four-step sequence shown in Figure 8 below, being careful

not to apply excessive force or twisting motions, insert the ammeter into

the panel opening. When using the DMS-BZL4’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.

PANELPANELPANEL

PANEL

BEZEL

GASKET

(optional)

CAL

DCA-20PC-X-DC1-XX

TB2

TB1

–SHUNT

(–V)

–

LOAD CURRENT

LOAD

DC SUPPLY

5-40Vdc

+SHUNT

SHUNT

MUST BE

IN LOW SIDE

Figure 7. 3-Wire Connections for "-DC1"

5-40Vdc Powered Models

If desired, an alternative decimal point by can be enable by opening the

factory closed solder gap and then closing one of the other two solder

gaps. The closing of SG1, SG2, or SG3 selects DP1 (“1.XXX”), DP2

(“1X.XX”), or DP3 (“1XX.X”), respectively.

8. Noisy Power Supplies: Some power supplies contain high-frequency

switching devices that may conduct and/or radiate signiﬁ cant noise

onto the low-level signal developed across the internal shunt. Even

though DCA-20PC ammeters incorporate built-in input ﬁ ltering, some

portion of this noise may be ampliﬁ ed and subsequently measured by

its sensitive input 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 -SHUNT

and +SHUNT inputs 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 load.

9. ‘Power ON’ LED: DCA-20PC ammeters include a rear-mounted ‘Power

On’ LED. The bright illumination of this LED indicates that the meter’s

internal power converter is operational. It does not signify that the

ammeter and the external load are connected correctly.

10. Measuring positive and negative currents (bipolar operation):

In applications where both positive and negative currents must be

measured, Murata Power Solutions recommends using ‘-DC4’ 8-36V

isolated supply models. Negative current ﬂ ow is denoted by the

illumination of the display’s negative (-) sign; the absence of a negative

sign implies positive current ﬂ ow. Contact Murata Power Solutions

if you have any questions regarding bipolar operation of DCA-20PC

ammeters. detailed wiring information. Any reconﬁ guration of J3 must

be made prior to connecting the power supply and load to the ammeter.

www.murata-ps.com/support

DCA-20PC Series

LED Display, Subminiature DC Ammeters with Built-In Shunts

MPM_DCA-20PC.C01 Page 5 of 6

MECHANICAL DIMENSIONS: Inches (mm)

TOLERANCES: 2 PL DEC ±0.02 (±0.51)

3 PL DEC ±0.010 (±0.254)

CAL

TB2

TB1

CAL

123

TB2

TB1

FRONT VIEW

ALL MODELS

BACK VIEW

DCA-20PC-X-DC4 MODELS

–SHUNT

DP1 DP2 DP3

SG1

SG2

SG3

SG1

SG2

SG3

–SHUNT

+SHUNT +SHUNT

–V

BACK VIEW

DCA-20PC-X-DC1 MODELS

#2-56 INSERT

0.156 (3.96) DEEP

FRONT VIEW

1.280

(32.51)

0.187

(4.75)

DMS-BZL4 BEZEL

1.826 (46.38)

0.838

(21.29)

1.626 (41.30)

1.07

(27.18)

INTERNAL CORNER RADII:

0.032 (0.81) MAX.

0.093 (2.362) DIAMETER (4 REQUIRED)

ONLY WHEN USING SUPPLIED BEZEL ASSEMBLY 0.116 (2.95)

1.336 (33.93) 0.145 (3.68)

MECHANICAL SPECIFICATIONS

BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT

0.80

(20.3)

0.88

(22.4)

1.30

(33.0)

0.040

(1.02)

1.04

(26.4)

0.475

(12.1)

0.040

(1.02)

1.38

(35.1)

1.42

(36.1)

www.murata-ps.com/support

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply

the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁ cations are subject to change without

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 U.S.A.

ISO 9001 and 14001 REGISTERED

This product is subject to the following operating requirements

and the Life and Safety Critical Application Sales Policy:

Refer to: http://www.murata-ps.com/requirements/

DCA-20PC Series

LED Display, Subminiature DC Ammeters with Built-In Shunts

MPM_DCA-20PC.C01 Page 6 of 6

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Murata:

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DCA-20PC-4-DC4-BS DCA-20PC-2-DC4-BS DCA-20PC-6-DC4-BS DCA-20PC-3-DC4-BS DCA-20PC-1-DC4-BS

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