Datasheet DMS-EB-LP, DMS-EB-HTB, DMS-EB, DMS-EB-TCK, DMS-EB-TCJ Datasheet (DATEL)

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com

Features

Figure 1. DMS-30PC Series Simplified Schematic

The DMS-30PC Series is a broad line of self-contained, fully operational, 3½
digit voltmeters with large, easy-to-read LED displays. The 0.56"(14.2mm) high
LED's are available in a wide variety of colors including red, orange, amber, yellow,
green, aqua, blue-green, and super-blue. A high-intensity version of the red display is
optional, as are low-power versions of the red, orange, and green displays.

The small size (2.17" x 0.92" x 0.56") of DMS-30PC meters is achieved by
integrating their display, display drivers, reference circuit, and A/D converter into in a
single, epoxy-encapsulated assembly. The device's 12-pin, component-like, DIP
package is both vibration and moisture proof. Each package incorporates a built-in
color filter and bezel and is easily mounted in either panels or pc cards.

These meters 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 an extremely stable, double-regulated reference and is
fully calibrated prior to potting. We guarantee outstanding initial accuracy (±1 count)
and excellent stability (±0.15 counts/°C). All models operate from a single +5V
supply, and the low-power models draw as little as 10mA (50mW total power). A
DISPLAY TEST function is standard on each device.

For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and
K thermocouples, etc.), the DMS-30PC Series includes a complete line of optional
"plug-on" application boards that conveniently convert your meter into an applica­tion-specific instrument.

• Large (0.56"/14.2mm) LED display

• 8 LED colors

• Low-power LED’s optional

• Epoxy-encapsulated, 12-pin DIP with

built-in color filter and bezel

• Miniature size:

2.17" x 0.92" x 0.56"
55mm x 23mm x 14mm

• Panel or pc-board mountable

• 4 differential input voltage ranges

• Auto-calibration, ±1 count accuracy

• User-selectable decimal point placement

• Single +5V supply (60mW for low-power

models)

• 0 to +60°C temperature range

• Numerous "plug-on" application boards

• Low cost

Actual Size

3½ Digit, LED Display

Low-Power, Miniature

Digital Panel Voltmeters

DMS-30PC Series

® ®

+1.23V

REFERENCE OUT

(+) INPUT HI

(–) INPUT LO

ANALOG
COMMON

REFERENCE OUT

REFERENCE IN

+5V SUPPLY

R1

DP 1

DP 2

DP 3

6

5

4

9

11

12

10

8

7

1

3

DC/DC

CONVERTER

2

DISPLAY TEST

5V RETURN

+5V

–5V

+5V

1.23V
REF.

R2

+2.0V

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.

V+

V–

A/D

CONVERTER

0 Vdc

0.01µF

1.82k

≈

NEW!

Super-Bright Blue
and Blue-Green LED Models

•

•

2

Performance/Functional Specifications

Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit,
unless otherwise noted.

DMS-30PC

3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS

DMS-30 PC - 1 - RS

LED Color:

AS = Standard Amber
BS = Super Blue
GS = Standard Green
OS = Standard Orange
QS = Standard Aqua
RS = Standard Red
YS = Standard Yellow
RH = High-Intensity Red
GL = Low-Power Green
OL = Low-Power Orange
RL = Low-Power Red
VFS = Blue-Green

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
"floating" measurements as described in the Applications section of
this data sheet and Ap Note 3 of the DATEL Panel Meter Catalog.

Pin 10 should not be connected to pin 3 (5V RETURN) or to your
system’s analog ground.

3. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a

precision reference actively trimmed at the factory. In normal
operation, pin 8 must be tied to pin 7 to achieve all listed accuracy
and drift specifications.

Accessories:

DMS-30-CP Panel cutout punch
DMS-BZL1 DMS-30 bezel assembly
DMS-BZL2 DMS-30 bezel assembly with sealing gasket
RN-DMS Gain/offset potentiometer kit for DMS-EB,

DMS-EB-AC/DC and DMS-EB-DC/DC

Add-On Application Boards:

DMS-EB Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-HTB High-accuracy temperature probe sensing for

±200mV models

DMS-EB-DC/DC Provides isolated +5V power
DMS-EB-TCJ J-type thermocouple inputs for ±2V models
DMS-EB-TCK K-type thermocouple inputs for ±2V models
DMS-EB-RMS For true rms measurements of ac voltages
DMS-EB-AC/DC For ac line-powered applications
DMS-EB-LP For 4-to-20mA loop-powered applications

Input Range:

0 = ±200mV
1 = ±2V
2 = ±20V

3 = ±200V Available on the

following models only:

-BS (Super Blue)

-GS (Standard Green)

-RS (Standard Red)

-RL (Low-Power Red)

-VFS (Blue-Green)

Ordering Information

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 See Technical Notes.

A panel-mount retaining clip is supplied with each model.

Analog Inputs Min. Typ. Max. Units

Full Scale Input Range:

DMS-30PC-0 -- ±200 -- mV
DMS-30PC-1 -- ±2 -- Volts
DMS-30PC-2 -- ±20 -- Volts
DMS-30PC-3 -- ±200 -- Volts

Input Impedance:

DMS-30PC-0, -1 100 1000 -- M Ω
DMS-30PC-2, -3 0.8 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
Display Test (Pin 2) Tie to +5V to activate all segments

Performance

Sampling Rate 2.5 samples per second
Accuracy (3 minute warm-up):

DMS-30PC-0 (VIN = +0.19V) -- ±1 ±2 Counts
DMS-30PC-1 (VIN = +1.9V) -- ±1 ±2 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 to +60°C) -- ±0.15 ±0.3 Cnts/°C
+1.23V Reference Output (Pin 9) ➁ +1.20 +1.23 +1.25 Volts

Power Supply Requirements

Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:

Standard Models -- +150 +225 mA
Low-Power Models:

Red display -- +12 +17 mA
Green or orange display -- +60 +100 mA

Display

Display Type and Size 3½ Digit LED, 0.56"/14.2mm high
Polarity Indication Autopolarity ("–" for negative VIN)
Overrange Indication "–1___" for negative VIN

"1___" for positive VIN

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)

Order on-line at www.datel.com

3

3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS

DMS-30PC

Applications

1. Single-Ended Input Configurations: True single-ended
measurements can be made with any DMS-30PC 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 flow in the wiring that connects
VIN to (–) INPUT LO (pin 12). Ground-loop currents can cause
unstable readings.

Figure 2. Single-Ended Input Configuration

DMS-30PC meters are highly versatile devices that can be used in
hundreds of applications. The application circuits chosen for this
section 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 straightforward as the approaches presented here. Most
applications have many more components — and many more
connections — than the illustrations show.

The simplified 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 amplifiers (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-voltage cases, pin 12 should always
be tied to pin 3 (5V RETURN).

One of the simplified 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).

4. DISPLAY TEST (Pin 2): Connecting pin 2 to +5V SUPPLY (pin

1) will activate all LED segments, except the decimal points, and
the display will read "1888" regardless of the actual applied input.
If a negative input is applied, DISPLAY TEST will also activate
the minus sign. To protect the LED's, the display should not

be left in the "test" mode for more than 10 seconds.

5. 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 appropriate 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:

Model Applied "0" Voltage Load Current*
DMS-30PC-X-RL +0.05V max. 0.7mA max.
All Others +0.4V max. 6mA max.

* The driving gates must be able to sink this much current

(IOL) with a logic "0" output.

6. 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. The circuit shown in Figure 10
provides ±10% range of adjustment.

7. Soldering Methods: All models in the DMS-30PC Series easily
withstand most common wave soldering operations. We
recommend, however, that 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 water-soluble solders and thorough cleaning
procedures.

8. Suggested Mating Connectors:

Panel mounted:

Connector housing DATEL P/N 39-2079400
Terminal type DATEL P/N 39-2099090
Crimping tool DATEL 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 DATEL P/N 39-2359625

1

12

3

+5V SUP

(–) IN LO

5V RET

DATEL

UPA-5/500

120 VAC

11

(+) IN HI

6

DP1

+

–

AC to DC Converter

V

IN

DMS-30PC-1

8

7

REF OUT

REF IN

4

DMS-30PC

3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS

Figure 3. Differential Input Configuration

R2

R1 + R2

x VIN = Reading

50kΩ < R1 + R2 < 10MΩ

Figure 6. Floating Input Measurements

(Alternate Configuration)

Figure 5. Floating Input Measurements

Figure 4. Input Attenuation Circuit

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 "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.

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 process-control applications, a 4-to-20mA current loop
is used to transmit information. Because DMS-30PC 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:

Applications

2. Differential Input Configurations: Differential measurements
can be made with all DMS-30PC 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 5V­powered 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-film 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.

1

12

3

+5V SUP

(–) IN LO

5V RET

DATEL

UPA-5/500

120 VAC

11

(+) IN HI

6

AC to DC Converter

R2

R1

R3

1k

1k

1k

8

7

REF IN

DP1

REF OUT

DMS-30PC-1

R2

11

12

(+) IN HI

(–) IN LO

V

IN

R1

+

–

1 3

+5V SUP 5V RET

DATEL

UPA-5/500

120 VAC

AC to DC Converter

8

7

REF OUT

REF IN

DMS-30PC-1

1

3

+5V SUP

5V RET

DATEL

UPA-5/500

120 VAC

6

DP1

AC to DC Converter

DMS-30PC-1

12

(–) IN LO

11

(+) IN HI

1.5V

CELL

+

–

8

REF OUT

REF IN

12

7

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-30PC-1

+5V SUP

DATEL

UPA-5/500

120 VAC

AC to DC Converter

5

3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS

DMS-30PC

Figure 10. External Gain AdjustmentFigure 8. 4.5-18V Power Supply Monitor

Figure 9. 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
RShunt = 1.000V/0.016A = 62.5 Ohms

6. Power Supply Monitoring: One of the most common digital
panel meter applications involves monitoring the output voltage of
the system power supply — often this supply also powers the
meter itself. The low-power, red LED DMS-30PC-2-RL can be
configured to allow power supply monitoring over the range of

4.5-18Vdc. The circuit in Figure 8 uses a low-drop-out, three­terminal regulator (LM-2931Z-5, available from National
Semiconductor) to provide regulated 5V power to the meter. The
LM-2931 was chosen because it has the following on-chip

protection features: reverse polarity, short circuit and thermal run­away. When using other, higher-power, DMS-30PC models with
three-terminal regulators, be sure to consult the regulator
manufacturer's data sheet to ensure the regulator is being
utilized safely and correctly.

7. Digital Ammeter: Digital ammeters are finding 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
included in DATEL's new Digital Panel Meter Databook.

8. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
operation. Use the +1.23V REFERENCE OUT (pin 9) for
applications needing external gain adjustment. Figure 10 shows
the wiring configuration for each model. Calibration is performed
with a precise, near-full-scale, input voltage.

Applications

1 3

5V RET

DATEL

UPA-5/500

120 VAC

AC to DC Converter

DMS-30PC-1

12

(–) IN LO

10

ANA COMM

11

(+) IN HI

R1

+

–

4-20mA

50k

R2

8

7

REF OUT

REF IN

9

1.23V
REF

5V SUP

DMS-30PC-2-RL

5

7 12

+
–

11

1

4.5 - 18Vdc

LM2931Z-5

GND

IN OUT

+5V SUP

3

5V RET

DP2

REF

IN

(+) IN HI

8

REF

OUT

(–) IN LO

22µF

10V

+

9

(+) IN HI

(–) IN LO

ANA COMM

10

1.23V REF

1k

10 to 20 Turns

8

REF IN

11

1k

10 to 20 Turns

8.45k, 1%

8.45k, 1%

5V RET

Connections

for ±2V, ±20V

and ±200V models

Connections

for ±200mV

models

7

NC

12

3

DMS-30PC

12

VOLTAGE

CALIBRATOR

OUT

COM

DMS-30PC-0

6

3

+
–

1

1.5 Amp (Load Current)

5Vdc

7

8

+5V SUP

5V RET

DP1

REF OUT

REF IN

11

0.150V

(+) IN HI

0.1Ω

R

Shunt

Load

(3.3 )

12

(–) IN LO

Ω

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com Email: [e-mail]

DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]

DATEL 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. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

® ®

DMS-30PC

3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS

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)

Mechanical Specifications

DS-0258F 03/01

MADE IN USA

® ®

BEZEL INSTALLATION

PANEL

BEZEL

RETAINING CLIP INSTALLATION

PANEL

#2-56 INSERT

0.156 (3.96) DEEP

FRONT VIEW

1.270

(32.26)

0.187
(4.75)

OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)

2.35 (59.69)

2.118 (53.80)

0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY

RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS

INTERNAL CORNER RADII:

0.032 (0.81) MAX.

1.07

(27.18)

0.878

(22.30)

0.096
(2.44)

0.116
(2.95)

2.55 (64.77)

PANEL CUTOUT

MADE IN USA

DMS-30PC-X-XX

PIN #1

IDENTIFIER

FRONT VIEW

+5V SUPPLY

DISPLAY TEST

5V RETURN

DP3
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
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 POTENTIOMETER HOLE LOCATION

0.125 (3.175) DIAMETER

(USE ONLY WHEN PC BOARD MOUNTING)

ISO 9001

Registered