APPLICATIONS

Any reconfiguration of J3 must be made prior to connecting the power

supply and shunt to the ammeter.

6. Replacing Analog Panel Meters: DCA5-20PC ammeters can be

used as replacements for analog panel meters that are driven by

50 or 100mV shunts, if a suitable dc voltage is available for powering the

ammeter. In retrofit applications, it is extremely important to determine the

shunt’s electrical configuration (i.e., high or low side). If any doubt exists as

to the shunt’s location, use only ‘-DC4’ isolated-supply models. Rewiring

must be performed with all power sources de-energized.

Figure 5. High-Side Shunt Connections for "-DC4"

8-36Vdc Isolated-Power Models

1

1

1

2

2

CAL

TB1

TB2

J3 J1 J2

1

1

2

2

3

M1

–IN

–

+IN

+

–V

+V

LOAD

50mV SHUNT

DC SUPPLY

8-36Vdc

POWER

GROUND

(0Vdc)

LOAD CURRENT

Figure 4. Typical Low-Side Shunt Connections for "-DC1" Models

Measuring a Battery’s Charge/Discharge Current

1

1

1

2

2

CAL

TB1

TB2

J1 J2

J3

1

1

2

2

3

1

2

LOADS

SOLAR

PANELS

CHARGE

DISCHARGE

50mV SHUNT

12 V

BATTERY

–IN

–

+IN

+

–+

–+

–V

+V

J3 MUST BE INSTALLED

(FACTORY SETTING) FOR

5-40Vdc SUPPLIES

J1 AND J2 POSITIONS

DEPEND ON INPUT RANGE

DCA5-20PC-X-DC1-XX

Figure 6. Using "-DC4" Isolated-Power Models to Maintain Isolation

Between Two Power Supplies

1

1

1

2

2

CAL

TB1

TB2

J1

J3

J2

1

1

2

2

3

M1

–IN

–

–

+IN

+

+

–V

+V

50mV SHUNT

LOAD CURRENT

DC SUPPLY #1

8-36Vdc

DC SUPPLY

#2

LOAD

SHUNT CAN BE IN

LOW OR HIGH SIDE

Figure 7. Decimal Point Selection Using J2 and J1

(Applies to All Models)

1

1

1

2

2

CAL

TB1

TB2

J1 J2

J3

1

1

2

2

3

1

2

J2 CONFIGURATION

DP2 OFF

DP3 OFF

DP2 ON

(1X.XX)

DP3 ON

(1XX.X)

SG3

SG2

SG1

1

2

3

1

2

3

1

2

3

DP1 OFF

1

2

DP1 ON

(1.XXX)

1

2

J1 CONFIGURATION

ALL MODELS

7. Decimal Point Selection: As shown in the Ordering Information guide, DCA5-

20PC ammeters are multiple input-range devices. For example, with a 50mV

input, DCA5-20PC-1-DC1 models can be configured to display “5.00”, “50.0, or

“500” Amps by simply removing or relocating decimal-point-selector jumper J2

(see Figure 7). Decimal points serve as placeholders only; they have no affect

on displayed accuracy or resolution. If jumper J2 is not available, solder gaps

SG1, SG2, or SG3 can be used to select DP1 (“1.XXX”), DP2 (“1X.XX”), or

DP3 (“1XX.X”), respectively.

www.murata-ps.com/support

DCA5-20PC Series

50mV & 100mV Input, LED-Display, Subminiature DC Ammeters

MPM_DCA5-20PC.C01 Page 4 of 6