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DCA5-20PC Series
50mV & 100mV Input, LED-Display,
TECHNICAL NOTES
To ensure safe and reliable operation, DCA5-20PC dc ammeters must
only be installed and serviced by quali?ed technical personnel. DC
ammeter applications can expose a user to potentially lethal currents
Subminiature DC Ammeters
DCA5-20PC-X- DC1 -XX
1
and voltages. Power and signal connections must be made with all
1
J3
1
J1 J2
1
associated power sources de-energized. Contact DATEL if you have any
questions regarding the installation or operation of any of our digital
CAL
2
2
2
3
J3 MUST BE INSTALLED
(FACTORY SETTING) FOR
instruments.
5-40Vdc SUPPLIES
J1 AND J2 POSITIONS
1. Calibration: DCA5-20PC ammeters are designed to operate with 50mV
and 100mV dc shunts whose rated accuracy is ±0.25%, or better. The
1 TB1
2
1 TB2 2
DEPEND ON INPUT RANGE
output of less accurate shunts may fall outside the ammeter’s ±1% calibra-
tion adjustment range. Under normal indoor operating conditions, periodic
recalibration of DCA5-20PC ammeters is not necessary. The calibration
–IN
+IN
+V
–V
potentiometer, located on the back of the ammeter, is a ? turn type; do not
force its adjustment screw past the two end stops.
SHUNT MUST
BE IN LOW SIDE
LOAD
+
DC SUPPLY
5-40Vdc
–
If user calibration is deemed necessary, it must be performed by quali?ed
personnel. Calibration is performed by applying a precision 50.00mVdc or
100mVdc (model speci?c, see ordering guide) signal to TB1, observing
correct polarity. Then, using an insulated slotted tool, adjust the calibration
potentiometer until the correct display reading is achieved. Contact MPS if
additional information is required regarding calibration or setup of DCA5-
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 regulatory or
50mV SHUNT
LOAD CURRENT
Figure 2. Low-Side Shunt Connections for "-DC1"
5-40Vdc Non-Isolated Supply Models
DCA5-20PC-X- DC1 -XX
1
POWER
GROUND
(0Vdc)
application-mandated requirements pertaining to the user’s installation. Con-
nections to DCA5-20PC ammeters must be made with all power sources
de-energized. Refer to the Functional Speci?cations section for TB1 and
CAL
1
2
J3
1
2
J1 J2
1
2
3
REMOVE J3
TB2 wire gauge information.
DCA5-20PC ammeters’ shunt (TB1) and power supply inputs (TB2) are not
FOR 36-75Vdc
SUPPLIES
internally fused. Therefore, the supply wires connected to the meter and the
1 TB1
2
1 TB2 2
load should be fused according to the maximum current rating (or lower)
of the wire gauge used, in accordance with applicable regulatory codes.
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
SHUNT MUST
–IN
+IN
+V
–V
terminal does not pinch any insulation. TB2 is to be used solely for power-
ing the meter’s internal circuitry; it must not be used to supply current to an
BE IN LOW SIDE
LOAD
+
DC SUPPLY
36-75Vdc
–
external load or auxiliary device.
3. Terminal Block Torque Ratings: It is important to tighten TB1’s and TB2’s
screw-terminals to their rated torque speci?cations of 3.6 pound-inches (0.4Nm).
50mV SHUNT
LOAD CURRENT
POWER
GROUND
(0Vdc)
Proper tightening will minimize losses and ensure reliable operation.
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/or its associated equipment.
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 DCA5-20PC Series ammeters. Figures 2, 3, and 4
depict typical low-side shunt connections.
High-Side Shunts: ‘-DC4’ isolated-power ammeters 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 supply. Figures 5 and 6 depict typical high-side shunt connections. As
shown in Figure 6, isolated-power models can also be used in applications
Figure 3. Low-Side Shunt Connections for "-DC1" Models Modi?ed for
36-75Vdc Non-Isolated Power (See Technical Note 5)
where one supply powers the ammeter and a second supply powers the
load, but the two supply grounds cannot be tied together. ‘-DC4’ isolated-
supply models include a built-in dc/dc converter to provide a minimum of
500Vdc isolation between the shunt (TB1) and power supply inputs (TB2).
5. 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 con?gured for 36 to 75Vdc operation by removing (opening) jumper
J3. Please note that this user modi?cation can only be performed on ‘-DC1
power models. Also, all ‘-DC1’ models – including those that have been
modi?ed for 36-75Vdc operation – can only be connected in low-side,
grounded-shunt applications. See Figure 3 for detailed wiring information.
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MPM_DCA5-20PC.B09 Page 3 of 6
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