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For full details go to
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DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MPM_DMS30LCD.E01 Page 1 of 6
Offering all the outstanding features and benefi ts of Murata Power Solutions’ industry
leading DMS-20LCD Series of 3½ Digit LCD Panel Meters, DMS-30LCD meters offer larger,
more easily readable displays at slightly higher power consumptions. Like all DMS Series
LCD meters, these miniature (2.17” x 0.92” x 0.43”), epoxy-encapsulated devices offer
component-like ease-of-use, outstanding reliability and easy installation in either panels or
pc-cards.
DMS-30LCD devices operate from a single +5V supply or a 9V battery. Battery-oper-
ated units typically draw 350μA and consume a mere 3.2mW. Backlit models are available
for low-light applications; though we have found many designers prefer Murata Power
Solutions’ unique low-power LED meters in those circumstances.
Offering 4 optional input voltage ranges (±200mV, ±2V, ±20V or ±200V), DMS-30LCD
meters have an extremely user-friendly input structure. They can be used in differential
or single-ended modes. Input impedance is a minimum 800kΩ. CMRR is typically 86dB.
CMV is ±2V, and inputs are overvoltage protected to ±100V.
Each meter incorporates an extremely stable, double regulated reference and is fully
calibrated at our factory prior to encapsulation. We guarantee outstanding initial accuracy
(±1 count) and excellent stability over temperature (±0.15 counts/°C). These extremely
rugged meters are moisture and vibration proof and never require adjustment or recalibra-
tion.
For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and K
thermocouples, etc.), the DMS-30LCD Series includes a complete line of "plug-on" applica-
tion boards that conveniently convert your meter into an application-specifi c instrument.
FEATURES
Large (0.4"/10.2mm), enhanced-contrast, LCD display
Single +5V supply or 9V battery
Power as low as 3.2mW
Miniature size:
2.17" x 0.92" x 0.43" (55mm x 23mm x 11mm)
Epoxy-encapsulated, 12-pin DIP
Backlit displays optional
4 differential input voltage ranges
High accuracy, ±1 count (±0.05%)
Autopolarity changeover and overrange indication
User-selectable decimal point placement
Numerous "plug-on" application boards
0 to +60°C temperature range
+1.23V REFERENCE OUT
(+) INPUT HI
ANALOG
(–) INPUT LO
COMMON
REFERENCE OUT
REFERENCE IN
R1
DP 1
DP 2
DP 3
6
5
+5V SUPPLY/
+BATTERY
49
11
12
10
8
7
1
3
DC/DC
CONVERTER
2
5V RETURN/
+5V
–BATTERY
–5V
+5V
REF.
R2
1.23V
DATA
+2.0V
V+
909k
V–
A/D
CONVERTER
0 Vdc
0.01µF
1
DISPLAY TEST/
BACKLIGHT
J1
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.
1.82k
DC/DC converter is not used on 9V-powered models,
J1 is connected.
Display Test function is not available on backlit models.
3
2
1
3
2
www.murata-ps.com/support
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MPM_DMS30LCD.E01 Page 2 of 6
TECHNICAL NOTES
Performance/Functional Specifi cations
Typical at TA = +25°C and supply voltage = +5V (using the single-ended input circuit)
or +9V (using the differential input circuit), unless otherwise noted.
➀ Applies 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.
➁ Listed spec applies to 5V-powered models only. For 9V-powered models, both
(–) INPUT LO (pin 12) and (+) INPUT HIGH (pin 11) must always be at least
1.5V above –BATTERY (pin 3) and at least 1.5V below +BATTERY (pin 1).
➂ See Technical Notes.
DMS-30LCD - 1 - 5 - C
Input Range:
0 = ±200mV
1 = ±2V
2 = ±20V
3 = ±200V
Accessories:
DMS-30-CP Panel cutout punch
DMS-BZL1-C DMS-30 bezel assembly
DMS-BZL2-C DMS-30 bezel assembly with sealing gasket
Add-On Application Boards:
DMS-EB-C Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-DC/DC-C Provides isolated +5V power
DMS-EB-RMS-C For true rms measurements of ac voltages
DMS-EB-AC/DC-C For ac line-powered applications
A panel-mount retaining clip is supplied with each model.
Leave blank for standard
models.
Add B for backlit models.
Power Source:
5 = +5V
9 = +9V
1. +1.23V REFERENCE OUTPUT (Pin 9): This pin is the output of the
meter’s precision +1.23V internal reference, and it is referenced to
ANALOG COMMON (pin 10) which sits at a potential of approximately
+2V. This output should be buffered if used to drive external loads
since sourcing more than 15µA from pin 9 can affect both the initial
accuracy and temperature drift of the meter.
2. ANALOG COMMON (Pin 10): This pin is connected to an internal,
low-noise, “relative” ground. It is used in certain differential and “fl oat-
ing” measurements as described in the Applications section of this data
sheet and Ap Note DMS-AN3 at
http://www.murata-ps.com/data/meters/dms-an3.pdf. Pin 10 should
not be connected to pin 3 (5V RETURN/–BATTERY) or to your
system’s analog ground.
Analog Inputs Min. Typ. Max. Units
Full Scale Input Range:
DMS-30LCD-0 – ±200 – mV
DMS-30LCD-1 – ±2 – Volts
DMS-30LCD-2 – ±20 – Volts
DMS-30LCD-3 – ±200 – Volts
Input Impedence:
DMS-30LCD-0, -1 100 1000 – MΩ
DMS-30LCD-2, -3 0.8 1 – MΩ
Overvoltage Protection ➀––
DMS-30LCD-0, -1, -2 – – ±100 Volts
DMS-30LCD -3 – – ±250 Volts
Common Mode Voltage Range ➁– – ±2 Volts
CMRR (dc to 60Hz) – 86 – dB
Control Inputs ➂
Decimal Pt. Placement (Pins 4-6):
Functionality
Logic Compatibility
Tie to pin 3 to activate
TTL (on 5V-powered models)
Display Test (Pin 2) Tie to pin 1 to activate
Backlight (Pin 2) Tie to pin 3 to turn on backlight
Performance
Sampling Rate 2.5 reading per second
Accuracy (1 minute warm-up):
DMS-30LCD-0 (Vin = +0.19V) – ±1 ±2 Counts
DMS-30LCD-1 (Vin = +1.9V) – ±1 ±2 Counts
DMS-30LCD-2 (Vin = +19V) – ±2 ±3 Counts
DMS-30LCD-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
+1.23V Reference Out (Pin 9) +1.20 +1.23 +1.25 Volts
Power Supply Requirements (5V Models)
Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:
Standard Models – 800 1200 µA
Backlit Models – 45 60 mA
Power Supply Requirements (9V Models)
Supply Voltage +7.5 +9.00 +14.0 Volts
Supply Current:
Standard Models – 350 600 µA
Backlit Models – 45 60 mA
Display
Display Type and Size 3½ digit, 0.4"/10.2mm high LCD
Polarity Indication Autopolarity ("–" for negative Vin)
Overrange Indication "–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
Ordering Information
Physical/Environmental
Operating Temperature 0 – +60 °C
Storage Temperature –20 – +75 °C
Humidity (non-condensing) 0 – 95 %
Case Material Polycarbonate
Weight 0.75 ounces (21 grams)
Add -C for RoHS
See www.murata-ps.com/dpm-availability for model-specifi c availability.
www.murata-ps.com/support
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MPM_DMS30LCD.E01 Page 3 of 6
APPLICATIONS
Figure 2. Single-Ended Input Confi guration
(5V-Powered Models)
Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V,
RSeries = Ohms
+12.6 – 9.2V
0.035
RSeries = Ohms
+BATTERY – 9.2V
0.035
RSeries = 97 Ohms
In any backlit application, including those with supply voltages
< 9.2V, the current drawn by the backlight (and therefore the current
drawn by the meter) can be reduced by installing a 1/4 Watt resistor
between pins 3 and 2. The brightness of the backlight will be reduced
proportionately.
7. Gain Adjust: There is a gain-adjust potentiometer on the back of each
meter. It has approximately ±50 counts (±2.5%) of adjustment range.
Since these devices essentially have no zero/offset errors, a gain
adjustment is effectively an overall accuracy adjustment. Though they
may be performed at any point (except zero), accuracy adjustments
are most effective when performed with higher level input signals.
Refer to Figure 9 for applications requiring greater ( ±10%) gain adjust-
ments.
DMS-30LCD meters are available in either 5V-powered or 9V-powered
models. 9V devices operate directly from 7.5V to 14V supplies (usually
batteries) without the need for external voltage regulators. 9V devices,
however, can not be used to measure voltages referenced to the negative
battery terminal (pin 3) because the minus input to the meter (pin 12, (–)
INPUT LO) must always be at least 1.5V above pin 3. 9V-powered meters
can only be used to make differential and not single-ended measurements.
5V-powered devices operate from any well-regulated +5V supply and will
accurately measure voltages both above and below pin 3 (5V RETURN) in
either single-ended or differential confi gurations.
1. Single-Ended Input Confi gurations: True single-ended measure-
ments can only be made with 5V-powered meters. 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).
8. Soldering Methods: All models in the DMS-30LCD Series easily
withstand most common wave soldering operations. We recommend,
however, you evaluate the effects your particular soldering techniques
may have on the meter’s plastic case and high-precision electrical
performance. We recommend the use of no-clean lead-free solders.
9. Suggested Mating Connectors:
Panel mounted:
Connector housing Murata Power Solutions P/N 4320-01069-0
Terminal type Murata Power Solutions P/N 4400-01032-0
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 Murata Power Solutions P/N 4320-01074-0
3. 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 appropriate decimal point by tying the appropriate
pin (pin 4, 5 or 6) to pin 3 (5V RETURN/
–BATTERY). Unused decimal point location pins should be left open.
For 5V-powered models, the decimal location pins are TTL compatible
and may be hard wired as described above or driven with 5V TTL logic
gates.
4. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci-
sion reference actively trimmed at the factory. In normal operation, pin
8 must be tied to pin 7 to achieve all listed accuracy and drift specifi ca-
tions.
5. DISPLAY TEST (Pin 2): (Not available on backlit models)
Connect DISPLAY TEST (pin 2) to +5V SUPPLY/+BATTERY
(pin 1) to activate. All LCD segments, exclusive of the decimal points,
will be momentarily enabled. Do not leave the unit in the TEST
mode for more than 10 seconds as this will damage the LCD seg-
ments.
6. BACKLIGHT (Pin 2) Function: For backlit models, grounding pin 2
(i.e. connecting it to pin 3) turns on the backlighting LED’s. 9V-pow-
ered backlit models function with supply voltages up to +14V, however,
activating the backlight with voltages greater than 9.2V can damage
the meter. Therefore, a 1/4 Watt series resistor must be installed
between pins 3 and 2 in these situations. The value of the series resis-
tor is determined using the following formula:
1
12
3
+5V SUP
(–) IN LO
5V RET
120 VAC
11
(+) IN HI
6
DP1
+
–
AC to DC Converter
V
IN
DMS-30LCD-1-5
8
7
REF OUT
REF IN
www.murata-ps.com/support
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MPM_DMS30LCD.E01 Page 4 of 6
APPLICATIONS
4. Floating Signal Source Measurements: Floating signals can be
measured using the circuits shown in Figures 5 and 6. Figure 5 uses
a 5V-powered meter. Figure 6 uses a 9V-powered meter. Connecting
pin 10 (ANALOG COMMON) 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.
Figure 3. Differential Input Confi guration
(5V-Powered Models)
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.
R2
R1 + R2
x VIN = Reading
50kΩ < R1 + R2 < 10MΩ
Figure 6. Floating Input Measurements
(9V-Powered Models)
Figure 5. Floating Input Measurements
(5V-Powered Models)
Figure 4. Input Attenuation Circuit
2. Differential Input Confi gurations: Differential measurements can be
made with either 5V-powered or 9V-powered meters. Figure 3, though
not a practical real-world application, uses a voltage divider to demon-
strate the concept of a differential input signal. Be careful not to exceed
the ±2V common mode voltage limitation for 5V-powered meters.
5. Process Control (4-to-20mA) Measurements: In many common
process-control applications, a 4-to-20mA current loop is used to
transmit information. Because DMS-30LCD meters have such high
input impedance, 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:
13
+ BAT
9V
–BAT
6
DP1
BATTERY
12
10
(–) IN LO
ANA COMM
11
(+) IN HI
CELL
+
1.5V
–
+
–
8
7
REF OUT
REF IN
DMS-30LCD-1-9
1
12
3
+5V SUP
(–) IN LO
5V RET
120 VAC
11
(+) IN HI
6
AC to DC Converter
R2
R1
R3
1k
1k
1k
8
7REF IN
DP1
REF OUT
DMS-30LCD-1-5
R2
11
12
(+) IN HI
(–) IN LO
V
IN
R1
+
–
31
+5V SUP 5V RET
120 VAC
AC to DC Converter
8
7
REF OUT
REF IN
DMS-30LCD-1-5
13
+5V SUP 5V RET
6
120 VAC
DP1
AC to DC Converter
12
10
(–) IN LO
ANA COMM
11
(+) IN HI
CELL
1.5V
+
–
8
7
REF OUT
REF IN
DMS-30LCD-1-5
www.murata-ps.com/support
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MPM_DMS30LCD.E01 Page 5 of 6
APPLICATIONS
R2
(R1 + R2 + R3) = 0.1
Figure 7. 4-to-20mA Current Loop Operation
(5V-Powered Models)
Figure 9. External Gain Adjustment
Figure 8. Power Supply Monitor
(9V-Powered Models)
6. Power Supply Monitoring: A popular application for Murata Power
Solutions’ low-power LCD meters is monitoring the supply voltage in
battery-operated portable equipment. Figure 8 demonstrates how a
9V-powered DMS-30LCD can be used to monitor its own supply. The
meter used is the DMS-30LCD-1-9. A three-resistor voltage divider is
used to attenuate the battery voltage and also to satisfy the require-
ment that the input voltages applied to pins 12 and 11 be at least 1.5
Volts above and below the battery voltage applied to pins 1 (+BAT-
TERY) and 3 (–BATTERY). The divider should be designed so that
1/10th the battery voltage falls across the inputs to the meter:
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 "1999". For different full
scale readings, alter the RShunt value accordingly.
R
Shunt = R1 = VFsr /IFsr
Where: VFsr = Full scale reading (in Volts)
I Fsr = Relative full scale current (in Amps)
Example: For a meter with a 2V full scale input (1.999 full
scale reading) and a desired full scale 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
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, opera-
tion. Use the +1.23V REFERENCE OUT (pin 9) for applications need-
ing external gain adjustment. Figure 9 shows the wiring confi guration
for each model. Calibration is performed with a precise, near-full-scale,
input voltage.
Therefore, the 9V battery voltage appears to the meter inputs as 0.9V.
With the decimal point moved to its DP2 position
(pin 5 tied to pin 3), the meter reads 9.00 Volts.
The circuit can be calibrated by fi rst measuring the actual battery volt-
age with another meter and then adjusting the gain-adjust potentiom-
eter on the back of the DMS-30LCD until a similar reading is obtained.
If possible, the resistors in the divider should be ±1% metal-fi lm types
with TCR’s less than 50ppm/°C.
1
12
3
+BAT
(–) IN LO
11
–BAT
5
DP2
(+) IN HI
R2
R1
R3
45.3k
10.1k
9V
45.3k
BATTERY
+
–
8
7
REF OUT
REF IN
DMS-30LCD-1-9
9
(+) IN HI
(–) IN LO
10
ANA COMM 1.23V REF
1k
8
REF IN
11
10 to 20 Turns
1k
10 to 20 Turns
8.45k, 1%
5V RET
8.45k, 1%
7
NC
12
3
For 5V models tie
(–) IN LO to pin 3
For 9V models tie
12
(–) IN LO to pin 10
VOLTAGE
OUT
COM
CALIBRATOR
Connections
for ±2V and
±20V models
Connections
for ±200mV
models
DMS-30LCD
31
+5V SUP 5V RET
120 VAC
AC to DC Converter
(–) IN LO
ANA COMM
(+) IN HI
R1
+
–
4-20mA
50k
R2
8
7
REF OUT
REF IN
DMS-30LCD-1-5
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
notice. © 2015 Murata Power Solutions, Inc.
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/
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MPM_DMS30LCD.E01 Page 6 of 6
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)
MADE IN USA
BEZEL INSTALLATION
PANEL
BEZEL
#2-56 INSERT
FRONT VIEW 0.156 (3.96) DEEP
1.270
(32.26)
0.187
(4.75)
2.35 (59.69)
2.118 (53.80)
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
INTERNAL CORNER RADII:
1.07
0.032 (0.81) MAX.
(27.18)
0.878
(22.30)
0.096
(2.44)
0.116
(2.95)
2.55 (64.77)
PANEL CUTOUT
RETAINING CLIP INSTALLATION
PANEL
MADE IN USA
PIN #1
DMS-30LCD-X-XX
IDENTIFIER
FRONT VIEW
+5V SUPPLY/ +BATTERY
DISPLAY TEST/BACKLIGHT
DP3
5V RETURN/ –BATTERY
DP2
DP1
1
2
3
4
5
6
12
11
10
9
8
7
(–) INPUT LO
(+) INPUT HI
ANALOG COMMON
+1.23V REFERENCE OUT
REFERENCE OUT
DP1
REFERENCE IN
DP2 DP3
2.17
(55.1)
2.09
(53.1)
1.80
(45.7)
0.15
TYP.
0.25 (6.4) TYP.
(3.7)
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)
0.430 (10.92) STANDARD
0.560 (14.22) BACKLIT
0.040
(1.02)
0.240
(6.10)
0.260
(6.60)
PIN 1
CALIBRATION POTENTIOMETER HOLE LOCATION
0.125 (3.175) DIAMETER
(USE ONLY WHEN PC BOARD MOUNTING)
