Figure 1. DMS-30DR Simplifi ed Schematic
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DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MPM_DMS-30DR.C02 Page 1 of 6
+1.225V REFERENCE OUT
(+) INPUT HI
(–) INPUT LO
ANALOG
COMMON
REFERENCE OUT
REFERENCE IN
+5V SUPPLY
R1
DP 1
DP 2
DP 3
6
5
49
11
12
10
8
7
1
3
2
EXTERNAL BRIGHTNESS
ADJUSTMENT
5V RETURN
+5V
–5V
+5V
1.225V
REF.
R2
DATA
909k
R2 is not used on ±200mV (-0) models or ±2V (-1) models.
R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models.
0 Vdc
0.01μF
1.82k
(1)
(1)
LIGHT
SENSOR
DC/DC
CONVERTER
CONVERTER
A/D
–5V
+5V
–5V
+5V
FEATURES
Super-bright LED displays are readable in direct
sunlight!
Autodim circuitry automatically adjusts display
brightness
Includes external brightness adjustment
Large (0.56"/14.2mm) easy-to-read red LED display
High reliability alternative to LCD displays
Ideal for automotive, industrial, and marine applications
Encapsulated package mounts in panels or pc-boards
Miniature housing: 2.17˝ x 0.92" x 0.56"
(55mm x 23mm x 14mm)
4 differential input ranges provide ±1 count accuracy
Single +5V supply; Less than 1-Watt power consumption
0 to +60°C operating temperature range
Murata Power Solutions’ new DMS-30DR Series are the fi rst digital panel meters to offer LED
displays that are readable in direct sunlight—no special fi lters or shading devices are required.
Their Autodim circuit automatically adjusts the display’s brightness to suit viewing environments
ranging from total darkness to full, brilliant sunlight. A user-accessible brightness adjustment pin
enables custom intensity settings or display matching in multiple display applications. Washed
out, hard-to-read digital readouts are a thing of the past!
Until now, users whose instrumentation required daylight visibility had to settle for less
reliable LCD display technology. However, in order to remain legible in low ambient light, LCDs
require complex, power-hungry backlighting circuitry. And, these displays typically suffer from
very narrow viewing angles. In contrast, DMS-30DR Series LED-based displays’ power consump-
tion drops as ambient light decreases, and their viewing angle extends to nearly 180 degrees
vertically and horizontally.
All models operate from a single +5V supply, and draw as little as 7mA when operated in total
darkness—that’s less than 1/10 Watt. At maximum brightness power consumption is typically
less than 200mA (1 Watt). DMS-30DR voltmeters are available in four differential input voltage
ranges: ±200mV, ±2V, ±20V and ±200V. Input impedance is 1,000 megohms for the ±200mV
and ±2V inputs and 1 megohm for the ±20V and ±200V inputs. CMRR for all devices is 86dB,
and inputs are overvoltage protected to ±250V. Each meter incorporates a precision, ultra-stable
voltage reference and is factory calibrated prior to encapsulation.
The small size (2.17" x 0.92" x 0.56") of DMS-30DR meters is achieved by integrating their
display, Autodim display drivers, light sensor, reference circuit, and A/D converter into in a rugged
epoxy-encapsulated assembly. The device’s 12-pin, component-like, DIP package is both vibra-
tion and moisture proof, making them ideal for harsh environments. Each package incorporates a
built-in color fi lter and bezel, and is easily mounted in either panels or pc boards.
Performance/Functional Specifi cations
Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit,
unless otherwise noted.
➀Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with
(–) INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected
(see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage.
➁See Technical Notes.
Analog Inputs Min. Typ. Max. Units
Full Scale Input Range:
DMS-30DR-0 – ±200 – mV
DMS-30DR-1 – ±2 – Volts
DMS-30DR-2 – ±20 – Volts
DMS-30DR-3 – ±200 – Volts
Input Impedance: –
DMS-30DR-0, -1 100 1000 – MΩ
DMS-30DR-2, -3 0.9 1 – MΩ
Overvoltage Protection ➀– – ±250 Volts
Common Mode Voltage Range – – ±2 Volts
CMRR (dc to 60Hz) – 86 – dB
Control Inputs ➁
Decimal Point Placement (Pins 4-6) Tie to pin 3 to activate
Ext. Bright (Pin 2) See Technical Note 1
Performance
Sampling Rate 2.5 reading per second
Accuracy (3 minute warm-up):
DMS-30PC-0 (Vin = +0.19V) – ±1 ±3 Counts
DMS-30PC-1 (Vin = +1.9V) – ±1 ±3 Counts
DMS-30PC-2 (Vin = +19V) – ±2 ±3 Counts
DMS-30PC-3 (Vin = +190V) – ±2 ±3 Counts
Zero Reading (Vin = 0 Volts) “–001” “000” “001”
Temperature Drift (0 = +60°C) – ±0.2 ±0.4 Cnts/°C
+1.225V Reference Output (Pin 9)➁+1.215 +1.225 +1.235 Volts
Power Supply Requirements
Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:
Full Sunlight – +150 +250 mA
Total Darkness –35mA
Display
Display Type and Size 3½ digit, 0.56"/14.2mm high LED
Polarity Indication Autopolarity ("–" for negative Vin)
Overrange Indication "–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
Physical/Environmental
Operating Temperature 0– +60 °C
Storage Temperature –40 – +75 °C
Humidity (non-condensing) 0 – 95 %
Case Material Polycarbonate
Weight 0.75 ounces (21 grams)
Ordering Information
DMS-30DR- 1 - R - C
LED Color:
R = Red
Accessories:
DMS-EB-C Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-RMS-C For true rms measurements of ac voltages
DMS-30-CP Panel cutout punch
Input Range:
0 = ±200mV
1 = ±2V
2 = ±20V
3 = ±200V
A panel-mount DMS-BZL2-C is supplied with each unit.
RoHS
See www.murata-ps.com/dpm-availability for model-specifi c availability.
www.murata-ps.com/support
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MPM_DMS-30DR.C02 Page 2 of 6
TECHNICAL NOTES
1. External Brightness Adjustment (Pin 2): Pin 2 is internally con-
nected to the high impedance input of an operational amplifi er that
amplifi es the output of the DMS-30DR’s ambient light sensor (ALS)
circuit. The output of this amplifi er varies the voltage that drives the
DMS-30DR’s LED display. Leave pin 2 open for standard auto-dim-
ming operation; in this mode, the ALS circuit will automatically adjust
the DMS-30DR’s LED brightness to compensate for changes in ambi-
ent lighting. As the ambient light striking the ALS increases, the LED
display’s brightness will also increase; a decrease in ambient light will
reduce the display’s brightness.
The ALS circuit’s output signal can be overdriven by applying an
externally generated voltage directly to pin 2. External drivers will see
approximately 600Kohms referenced to 5V RETURN. With pin 2 at
+0.7Vdc or below, the DMS-30DR’s LED display is off, and total cur-
rent drain from a nominal +5V supply is approximately 1mA. The LED
display’s brightness will increase from minimum to maximum as the
voltage applied to pin 2 is varied from +0.8V up to +2.5V, respectively.
To enable continuous maximum display brightness, connect pin 2
directly to pin 1 (+5V SUPPLY); in this confi guration the total current
drain for the meter will be approximately 200mA.
2. Minimum-Intensity Adjustment Potentiometer: Users can adjust
the DMS-30DR’s minimum LED brightness to suit their requirements
by adjusting the ¾-turn, rear-mounted intensity adjustment poten-
tiometer. Please note, this potentiometer will have minimal impact
on display brightness in high ambient light environments. See the
Mechanical Specifi cations section for potentiometer locations.
The intensity adjustment potentiometer is factory preset to its
mid-point position, producing a typical current drain of 7mA. At it’s
minimum and maximum positions, current drain is typically 3mA and
13mA, respectively. As viewed from the rear of the meter, with the
model number label facing up, turning the potentiometer clockwise
increases the display’s intensity.
3. +1.225V REFERENCE OUTPUT (Pin 9): This pin is the output of the
meter’s precision +1.225V internal reference IC. Pin 9 is referenced
to ANALOG COMMON (pin 10), which in turn sits approximately +2V
above pin 3. Pin 9 should be buffered if it’s used to drive external
loads since sourcing more than 15µA of current can affect both the
* The DMS-30DR-0-R -C is
To Be Discontinued. Last
time buy date is 3/31/2019.
Please click here to view
the Discontinuance Notice.
To Be Discontinued *
* Last Time Buy date is 3/31/2019. Please click here to view the Discontinuance Notification.
1. Single-Ended Input Confi gurations: True single-ended measure-
ments can be made with any DMS-30DR meter. The circuit of Figure
2 avoids problems normally associated with ground-loop currents.
Separate ground runs should be used for 5V RETURN (pin 3) and (–)
INPUT LO (pin 12). This will ensure that large LED currents will not
fl ow in the wiring that connects VIN to (–) INPUT LO (pin 12). Ground-
loop currents can cause unstable readings.
Figure 2. Single-Ended Input Confi guration
DMS-30DR meters are highly versatile devices that can be used in
hundreds of applications. The application circuits chosen for this sec-
tion have historically received many inquiries. Every attempt has been
made to ensure technical accuracy, and all of the following circuits
have been prototyped and tested to ensure functionality. Please keep
in mind, however, that real-world applications are seldom as straight-
forward as the approaches presented here. Most applications have
many more components — and many more connections — than the
illustrations show.
The simplifi ed schematic shown in Figure 1 can be very useful when
debugging a malfunctioning panel meter circuit, particularly if the user
has some knowledge of operational amplifi ers (op amps). The meter's
high-impedance input consists of an op amp powered from a ±5Vdc
power supply (the –5V is internally generated). Knowing this, one can
easily see why input signals applied to (–) INPUT LO and (+) INPUT HI
have to be kept within the power supply rails of ±5V. Also note that only
pin 11 has a current-limiting 909kΩ series resistor. High input voltages
that have a common ground with pin 3 (5V RETURN) should only be
applied to pin 11 ((+) INPUT HI) and never to pin 12. In these high-volt-
age cases, pin 12 should always be tied to pin 3 (5V RETURN).
One of the simplifi ed schematic's noteworthy features is that it
shows internal voltage values. It also shows that pin 3 is the meter's
zero-volt reference point — regardless of the type of power or signal
source used. This is an important point to keep in mind when a digital
or analog multimeter is used to make system measurements. The
multimeter's negative lead (usually the black one) must be connected
to pin 3 (5V RETURN).
1
12
3
+5V SUP
(–) IN LO
5V RET
11
(+) IN HI
6
DP1
+
–
AC to DC Converter
V
IN
DMS-30DR-1
8
7
REF OUT
REF IN
85-264Vac
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DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MPM_DMS-30DR.C02 Page 3 of 6
APPLICATIONS
accuracy and temperature drift of the meter. A ±1% 1.82K limiting
resistor is connected between the reference IC and pin 9.
4. ANALOG COMMON (Pin 10): This pin is connected to an internal,
low-noise, “relative” ground. Pin 10 also serves as the internal
ground for the +1.225V reference IC. ANALOG COMMON is used
in certain differential and “fl oating” measurements as described in
the Applications section of this data sheet, and in DMS Applica-
tion Note 3. For the vast majority of applications, pin 10 should not
be connected to pin 3 (5V RETURN), or to your system’s analog
ground.
5. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci-
sion reference actively trimmed at the factory. For normal operation,
pin 8 must be tied to pin 7 to achieve all listed accuracy and drift
specifi cations.
6. Decimal Point Placement: The location of the decimal point is user
selectable, and the decimal point control pins (DP1-DP3) are active
low functions. Select the desired decimal point by tying the appro-
priate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal
point location pins should be left open. Hard wiring is preferable,
however, you can use logic gates to exercise dynamic control over
the location of the decimal point if the following drive conditions are
met:
Applied “0” Voltage: +0.4V max
Drive Current*: 6mA max.
* The driving gates must be able to sink this much current (IOL)
with a logic “0” output.
7. Gain-Adjust Potentiometer: The gain-adjust potentiometer located
on the rear of the meter has approximately ±50 counts (±2.5%)
of adjustment range with a near full-scale input. Since these
meters essentially have no zero/offset errors, a gain adjustment is
effectively an overall accuracy adjustment. Though they may be
performed at any input level except zero, accuracy adjustments are
most effective when performed with half-scale (or higher) positive
input signals.
If a wider adjustment range is required, an external potentiometer
circuit can be confi gured using the meter’s +1.225V reference
output (pin 9). The circuit shown in Figure 9 provides ±10% range
of adjustment.
8. Soldering Methods: All models in the DMS-30DR Series easily
withstand most common leaded or lead-free soldering opera-
tions, performed either manually or by wave soldering machines.
However, users should evaluate the effects their particular soldering
techniques may have on the meter’s plastic case and precision
electrical performance. We highly recommend using low residue,
no-clean solders.
9. Suggested Mating Connectors:
Panel mounted: Connector housing P/N 4320-01069-0
Terminal type: P/N 4400-01032-0
Crimping tool: P/N 39-2099000
Wire size: 22 to 26 AWG
Insulation diameter: 0.062” (1.57mm) maximum
Stripping length: 0.100 to 0.125” (2.54 to 3.17mm)
Board mounted: Socket: P/N 4320-01074-0
Figure 3. Differential Input Confi guration
R2
R1 + R2
x VIN = Reading
50kΩ < R1 + R2 < 10MΩ
Figure 6. Floating Input Measurements
(Alternate Confi guration)
Figure 5. Floating Input Measurements
Figure 4. Input Attenuation Circuit RShunt = R1 = VFsr /IFsr
Where: VFsr = Full scale reading (in Volts)
IFsr = Relative full scale current (in Amps)
5. Process Control (4-to-20mA) Measurements: In many common pro-
cess-control applications, a 4-to-20mA current loop is used to transmit
information. Because DMS-30DR meters have such high input imped-
ance, a simple shunt resistor across the meter's input can be used to
convert the loop current to a voltage. See Figure 7. The value of the
shunt resistor is a function of the scaling requirements of the particular
application and can be calculated using the following equation:
2. Differential Input Confi gurations: Differential measurements can be
made with all DMS-30DR meters. Figure 3, though not a practical real-
world application, uses a voltage divider to demonstrate the concept
of a differential input signal. Be careful not to exceed the ±2V common
mode voltage limitation for 5V-powered meters.
3. Engineering Scaling: For measuring voltages greater than the full
scale input range of a given meter, the input signal must be attenuated.
A simple voltage divider (similar to that shown in Figure 4) will scale
the input to within the range of the selected meter. R1 and R2 should
be precision, ±1%, metal-fi lm resistors with absolute TCR's less than
50ppm/°C. See Ap Note 4 for more information on engineering scaling.
4. Floating Signal Source Measurements: Floating signals can be
measured using the circuits shown in Figures 5 and 6. Connecting pin
10 (ANALOG COMMON) or pin 3 (5V RETURN) to (–) INPUT LO (pin
12) provides the reference point for the meter's input.
A "fl oating" input is a signal that has no galvanic connection to the
meter's power supply. In the fi gures below, the 1.5V battery illustrates a
true fl oating input.
1
12
3
+5V SUP
(–) IN LO
5V RET
11
(+) IN HI
6
AC to DC Converter
R2
R1
R3
1k
1k
1k
8
7 REF IN
DP1
REF OUT DMS-30DR-1
85-264Vac
R2
11
12
(+) IN HI
(–) IN LO
V
IN
R1
+
–
1
3
+5V SUP 5V RET
8
7
REF OUT
REF IN
DMS-30DR-1
85-264Vac
1
3
+5V SUP 5V RET
6
DP1
AC to DC Converter
DMS-30DR-1
12
(–) IN LO
11
(+) IN HI
1.5V
CELL
+
–
8
REF OUT
REF IN
7
85-264Vac
1
3
5V RET
6
DP1
12
(–) IN LO
10
ANA COMM
11
(+) IN HI
1.5V
CELL
+
–
8
7
REF OUT
REF IN
DMS-30DR-1
+5V SUP
AC to DC Converter
85-264Vac
www.murata-ps.com/support
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MPM_DMS-30DR.C02 Page 4 of 6
APPLICATIONS
Figure 9. External Gain Adjustment
Figure 8. Basic DC Ammeter Circuit
Figure 7. 4-to-20mA Current Loop Operation
To calibrate the circuit of Figure 7, perform the following:
1. With 4mA applied, adjust the 50kΩ potentiometer (R2) to
display a reading of "000" (assuming that is the desired
reading).
2. With 20mA applied, adjust the gain-adjust potentiometer on
the back of the meter to display a reading of "1000". For
different full scale readings, alter the value of RShunt accordingly.
Example: For a meter with a 2V full scale input (1.999 full
scale reading) and a desired display reading of
"1000" (with an input of 20mA), VFsr = 1.000 Volts
RShunt = 1.000V/(0.020 – 0.004)A
R
Shunt = 1.000V/0.016A = 62.5 Ohms
6. Digital Ammeter: Digital ammeters are fi nding ever-increasing usage
because analog-style ammeters (moving-vane types) now cost roughly
the same as their digital counterparts. Additionally, analog ammeters
are not nearly as rugged as modern digital panel voltmeters. Figure 9
illustrates a typical ammeter application. The circuit uses a ±200mV
input meter — the preferred range for most ammeters — to measure
the voltage developed across a 0.1Ω current shunt. The circuit shown
represents a basic ammeter connection diagram. A detailed application
note describing digital dc ammeters is available at www.cd4power.com.
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
operation. Use the +1.225V REFERENCE OUT (pin 9) for applica-
tions needing external gain adjustment. Figure 10 shows the wiring
confi guration for each model. Calibration is performed with a precise,
near-full-scale, input voltage.
1
3
5V RET
AC to DC Converter
DMS-30DR-1
12
(–) IN LO
10
ANA COMM
11
(+) IN HI
R1
+
–
4-20mA
50k
R2
8
7
REF OUT
REF IN
9
1.225V
REF
5V SUP
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DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MPM_DMS-30DR.C02 Page 5 of 6
APPLICATIONS
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL
RECOMMENDED PC BOARD FINISHED HOLE DIAMETER:
0.042 ±0.003 (1.067 ±0.076)
DMS-30-DR-X-XX
PIN #1
IDENTIFIER
FRONT VIEW
+5V SUPPLY
EXT. BRIGHTNESS
5V RETURN
DP3
DP2
DP1
1
2
3
4
5
6
12
11
10
9
8
7
(–) INPUT LO
(+) INPUT HI
ANALOG COMMON
+1.225V REFERENCE OUT
REFERENCE OUT
REFERENCE IN
DP1 DP2 DP3
2.17
(55.1)
2.09
(53.1)
1.80
(45.7)
0.25 (6.4) TYP.
0.15
(3.7)
TYP.
0.040
(1.02)
0.040
(1.02)
0.10
(2.5)
TYP.
0.50
(12.7)
0.17
(4.3)
TYP.
0.92
(23.4)
0.84
(21.3)
0.560
(14.22)
0.040
(1.02)
0.250
(6.35)
0.260
(6.60)
PIN 1
CALIBRATION AND MIN-INTENSITY
POTENTIOMETER HOLE LOCATIONS
0.125 (3.175) DIAMETER
(USE ONLY WHEN PC BOARD MOUNTING)
0.205
(5.20)
0.595
(15.1)
INTENSITY CALIBRATION
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BEZEL INSTALLATION
BEZEL
GASKET
PANEL
Front View
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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 notice. © 2018 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
129 Flanders Road, Westborough, MA 01581 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/
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MPM_DMS-30DR.C02 Page 6 of 6
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
MECHANICAL SPECIFICATIONS