DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
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
Offering all the outstanding features and benefits of DATEL’s 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 DATEL’s 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-specific instrument.
+5V
+5V SUPPLY/ 1
+BATTERY
–5V
3
V+
R2
1
12
(–) INPUT LO
0.01μF
V–
+2.0V
DISPLAY TEST/ 2
BACKLIGHT
DC/DC
2
CONVERTER
R1
909k
11
(+) INPUT HI
5V RETURN/ 3
–BATTERY
J1
0 Vdc
A/D
CONVERTER
DATA
1.23V
REF.
10 ANALOG
COMMON
DP 3
4
1.82k
5
+5V
9
+1.23V REFERENCE OUT
DP 2
8
REFERENCE OUT
DP 1
6
7
REFERENCE IN
1
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.
2
DC/DC converter is not used on 9V-powered models,
J1 is connected.
Display Test function is not available on backlit models.
3
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS30LCD.D01
Page 1 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
Performance/Functional Specifications
Typical at T
A
= +25°C and supply voltage = +5V (using the single-ended input circuit)
or +9V (using the differential input circuit), unless otherwise noted.
Analog Inputs
Full Scale Input Range:
DMS-30LCD-0
DMS-30LCD-1
DMS-30LCD-2
DMS-30LCD-3
Input Impedence:
DMS-30LCD-0, -1
DMS-30LCD-2, -3
Overvoltage Protection
DMS-30LCD-0, -1
DMS-30LCD-2, -3
Common Mode Voltage Range
CMRR
(dc to 60Hz)
Control Inputs
Decimal Pt. Placement
(Pins 4-6):
Functionality
Logic Compatibility
Display Test
(Pin 2)
Backlight
(Pin 2)
Performance
Sampling Rate
Accuracy (1 minute warm-up):
DMS-30LCD-0 (Vin = +0.19V)
DMS-30LCD-1 (Vin = +1.9V)
DMS-30LCD-2 (Vin = +19V)
DMS-30LCD-3 (Vin = +190V)
Zero Reading
(Vin = 0 Volts)
Temperature Drift
(0 = +60°C)
+1.23V Reference Out
(Pin 9)
–
–
–
–
“–001”
–
+1.20
±1
±1
±2
±2
“000”
±0.2
+1.23
±2
±2
±3
±3
“001”
±0.4
+1.25
Cnts/°C
Volts
Counts
Counts
Counts
Counts
2.5 reading per second
Accessories:
DMS-30-CP
DMS-BZL1-C
DMS-BZL2-C
RN-DMS
100
0.8
–
–
–
–
–
1000
1
–
–
–
–
86
–
–
±250
±100
±250
±2
–
M
M
Volts
Volts
Volts
Volts
dB
–
–
–
–
±200
±2
±20
±200
–
–
–
–
mV
Volts
Volts
Volts
Min.
Typ.
Max.
Units
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Case Material
Weight
0
–20
0
–
–
–
+60
+75
95
°C
°C
%
Polycarbonate
0.75 ounces (21 grams)
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.
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).
See Technical Notes.
Ordering Information
DMS-30LCD - 1 - 5
Tie to pin 3 to activate
TTL (on 5V-powered models)
Tie to pin 1 to activate
Tie to pin 3 to turn on backlight
Input Range:
0
= ±200mV
1
= ±2V
2
= ±20V
3
= ±200V
-C
Add -C for RoHS
Leave blank for standard
models.
Add
B
for backlit models.
Power Source:
5
= +5V
9
= +9V
Panel cutout punch
DMS-30 bezel assembly
DMS-30 bezel assembly with sealing gasket
Gain/offset potentiometer kit for DMS-EB,
DMS-EB-AC/DC and DMS-EB-DC/DC
Power Supply Requirements (5V Models)
Supply Voltage
Supply Current:
Standard Models
Backlit Models
–
–
800
45
1200
60
μA
mA
+4.75
+5.00
+5.25
Volts
Add-On Application Boards:
DMS-EB-C
Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-HTB-C
High-accuracy temperature probe sensing for
±200mV models
DMS-EB-DC/DC-C
Provides isolated +5V power
DMS-EB-TCJ-C
J-type thermocouple inputs for ±2V models
DMS-EB-TCK-C
K-type thermocouple inputs for ±2V models
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.
Power Supply Requirements (9V Models)
Supply Voltage
Supply Current:
Standard Models
Backlit Models
Display
Display Type and Size
Polarity Indication
Overrange Indication
3½ digit, 0.4"/10.2mm high LCD
Autopolarity ("–" for negative Vin)
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
–
–
350
45
600
60
μA
mA
+7.5
+9.00
+14.0
Volts
TECHNICAL NOTES
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 “float-
ing” measurements as described in the Applications section of this
data sheet and Ap Note 3 of the DATEL Panel Meter Catalog.
Pin 10
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
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MPM_DMS30LCD.D01
Page 2 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
should not be connected to pin 3 (5V RETURN/–BATTERY) or to
your system’s analog ground.
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 specifica-
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:
R
Series
=
+BATTERY – 9.2V
0.035
Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V,
R
Series
=
+12.6 – 9.2V
0.035
R
Series
= 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.
Ohms
Ohms
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 solders.
9. Suggested Mating Connectors:
Panel mounted:
Connector housing
Terminal type
Crimping tool
Wire size
Insulation diameter
Stripping length
DATEL P/N 39-2079400
DATEL P/N 39-2099090
DATEL P/N 39-2099000
22 to 26 AWG
0.062” (1.57mm) maximum
0.100 to 0.125” (2.54 to 3.17mm)
Board mounted:
Socket DATEL P/N 39-2359625
APPLICATIONS
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 configurations.
1. Single-Ended Input Configurations:
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).
DMS-30LCD-1-5
+
V
IN
–
12
(–) IN LO
1
+5V SUP
6
DP1
3
5V RET
7
REF IN
11
(+) IN HI
8
REF OUT
120 VAC
DATEL
UPA-5/500
AC to DC Converter
Figure 2. Single-Ended Input Configuration
(5V-Powered Models)
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS30LCD.D01
Page 3 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
2. Differential Input Configurations:
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.
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 “floating” input is a signal that has no galvanic connection to the
meter’s power supply. In the figures below, the 1.5V battery illustrates a
true floating input.
11
(+) IN HI
10
ANA COMM
12
(–) IN LO
1
+5V SUP
3
5V RET
6
DP1
+
DMS-30LCD-1-5
REF OUT
8
11
(+) IN HI
R1
1k
DMS-30LCD-1-5
8
REF OUT
REF IN
7
DP1
6
12
(–) IN LO
R2
1k
1.5V
CELL
1
+5V SUP
3
5V RET
R3
1k
–
7
REF IN
120 VAC
DATEL
UPA-5/500
120 VAC
DATEL
UPA-5/500
AC to DC Converter
Figure 3. Differential Input Configuration
(5V-Powered Models)
AC to DC Converter
Figure 5. Floating Input Measurements
(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-film resistors with absolute TCR’s less than
50ppm/°C. See Ap Note 4 for more information on engineering scaling.
50k < R1 + R2 < 10M
R2
R1 + R2
+
11
(+) IN HI
10
ANA COMM
12
(–) IN LO
1
+ BAT
+
DMS-30LCD-1-9
8
REF OUT
1.5V
CELL
+
–
7
REF IN
3
–BAT
6
DP1
x V
IN
= Reading
9V
BATTERY
–
R1
V
IN
R2
DMS-30LCD-1-5
11
(+) IN HI
8
REF OUT
Figure 6. Floating Input Measurements
(9V-Powered Models)
–
12
(–) IN LO
7
REF IN
1
+5V SUP
3
5V RET
120 VAC
DATEL
UPA-5/500
AC to DC Converter
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:
Figure 4. Input Attenuation Circuit
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MPM_DMS30LCD.D01
Page 4 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
R
Shunt
= R1 = V
Fsr
/ I
Fsr
Where:
V
Fsr
= 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), V
Fsr
= 1.000 Volts
R
Shunt
= 1.000V/(0.020 – 0.004)A
R
Shunt
= 1.000V/0.016A = 62.5 Ohms
To calibrate the circuit of Figure 7, perform the following:
1. With 4mA applied, adjust the 50k 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 R
Shunt
value accordingly.
DMS-30LCD-1-9
8
REF OUT
11
(+) IN HI
R1
45.3k
R2
= 0.1
(R1 + R2 + R3)
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 first 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-film types
with TCR’s less than 50ppm/°C.
12
(–) IN LO
7
REF IN
1
+BAT
9V
BATTERY
+
3
–BAT
5
DP2
R2
10.1k
R3
45.3k
DMS-30LCD-1-5
(+) IN HI
8
REF OUT
+
4-20mA
R1
–
50k
120 VAC
DATEL
UPA-5/500
–
ANA COMM
7
REF IN
1
R2
+5V SUP
3
5V RET
Figure 8. Power Supply Monitor
(9V-Powered Models)
(–) IN LO
AC to DC Converter
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 configuration
for each model. Calibration is performed with a precise, near-full-scale,
input voltage.
Figure 7. 4-to-20mA Current Loop Operation
(5V-Powered Models)
6. Power Supply Monitoring:
A popular application for DATEL’s low-
power LCD meters is monitoring the supply voltage in battery-oper-
ated 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 requirement 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 (+BATTERY) and 3
(–BATTERY). The divider should be designed so that 1/10th the bat-
tery voltage falls across the inputs to the meter:
OUT
VOLTAGE
CALIBRATOR
COM
11
(+) IN HI
DMS-30LCD
12
3
5V RET
12
(–) IN LO
10
ANA COMM
8
NC
8.45k, 1%
1k
10 to 20 Turns
7
REF IN
9
1.23V REF
For 5V models tie
(–) IN LO to pin 3
Connections
for ±2V and
±20V models
For 9V models tie
(–) IN LO to pin 10
1k
10 to 20 Turns
8.45k, 1%
Connections
for ±200mV
models
Figure 9. External Gain Adjustment
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS30LCD.D01
Page 5 of 6
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