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DCA-20PC Series
Performance/Functional Speci?cations
Typical at T A = +25°C, unless otherwise noted.
LED Display, Subminiature DC Ammeters
with Built-In Shunts
Full Scale Load Current ?
Min.
Typ.
Max.
Units
DCA-20PC-1
–
–
199.9
μAdc
Physical/Environmental (continued)
DCA-20PC-2
–
–
1.999
mAdc
Humidity (non-condensing)
0
–
85
%
DCA-20PC-3
DCA-20PC-4
DCA-20PC-5
–
–
–
–
–
–
19.99
199.9
1.999
mAdc
mAdc
Adc
Case Material
Dimensions
Weight
Polycarbonate
1.38"W x 0.88" x 1.0" nominal
0.6 ounces (17 grams)
DCA-20PC-6
Overcurrent Rating (<6 sec.) ?
Internal Shunt Resistance
– – 19.99 Adc
1.5x rated full-scale load current
Ordering Information
DCA-20PC - 1 - DC 1 - R L - C
DCA-20PC-1
–
–
100
Ohms
DCA-20PC-2
DCA-20PC-3
–
–
–
–
10
1.0
Ohms
Ohm
Add -C for RoHS
LED Color:
DCA-20PC-4
DCA-20PC-5
DCA-20PC-6
–
–
–
–
–
–
0.1
0.01
0.001
Ohm
Ohm
Ohm
Input Range:
Full-scale load current
1 = 199.9μA
BL = Low-Power Blue
BS = Super Blue
GS = Standard Green
PGL = Low-Power Green
RL = Low-Power Red
Shunt Input to Power Supply Isolation ?
2 = 1.999mA
Power Supply:
DCA-20PC-X-DC4 models only
Performance
Sampling Rate
500
– –
2.5 reading per second
Volts
3 = 19.99mA
4 = 199.9mA
5 = 1.999A
6 = 19.99A
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)
Accuracy
±0.15%FS
Accessories:
Zero-Current Reading ?
Temperature Drift (0 = +60°C)
“–001”
–
“000”
±0.2
“001”
±0.4
Counts
Cnts/°C
DMS-20-CP Panel Cutout Punch
A DMS-BZL4-C bezel assembly with sealing gasket is
supplied with each ammeter.
Operating Supply Voltage (TB 2 Terminals 1, 2 a nd 3) ?
DCA-20PC-X- DC1 -XX +5.0 – +40
Vdc
? 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-
DCA-20PC-X- DC4 -XX
+8
–
+36
Vdc
meter’s built-in shunt and exits via TB1-2 (+SHUNT). For all models, this same full-
Operating Supply Current (TB 2 Terminals 1, 2 and 3) ?
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.
DCA-20PC-X- DC1 -XX (@ 5-40V)
DCA-20PC-X- DC4 -XX (@ 8V)
DCA-20PC-X- DC4 -XX (@ 36V)
–
–
–
10
100
25
15
150
40
mAdc
mAdc
mAdc
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
?ow is denoted by the illumination of the display’s negative (-) sign; the absence
TB1 and TB2 Terminal Blocks
of a negative sign implies positive current ?ow. Contact MPS if you have any ques-
Wire Size
Insulation Strip Length
Screw Tightening Torque
Rated Current
Display
Display Type and Size
Overrange Indication
Display Reading/Decimal Point
Physical/Environmental
12-20AWG, (solid)
14-20AWG, (stranded) copper wire
0.250 inches
4.4 pound/inches (0.5Nm)
20A with 12AWG solid copper wire;
15A with 14AWG solid or stranded
copper wire
3? digit, 0.37"/9.4mm high red, blue or
green LED
"–1_ _ _" for negative Vin
"1_ _ _" for positive Vin
Model dependent
tions regarding bipolar operation of DCA-20PC ammeters.
? 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).
? 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.
? Zero reading is measured with TB1-1 (-SHUNT) shorted to TB1-2 (+SHUNT).
? 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).
Operating Temperature
Storage Temperature
0
–20
–
–
+60
+75
°C
°C
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).
www.murata-ps.com/support
MPM_DCA-20PC.B07 Page 2 of 6
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