DATEL DMS-30PC Service Manual

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Actual Size

®®

DMS-30PC Series

3½ Digit, LED Display

Low-P o wer, Miniature

Digital Panel Voltmeters

Features

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• Large (0.56"/14.2mm) LED display

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• 7 LED colors

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• Low-power LED’s optional

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• Epoxy-encapsulated, 12-pin DIP with

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built-in color filter and bezel

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• Miniature size:

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

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• Panel or pc-board mountable

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• 4 differential input voltage ranges

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• Auto-calibration, ±1 count accuracy

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• User-selectable decimal point placement

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

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models)

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• 0 to +60°C temperature range

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• Numerous "plug-on" application

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boards

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• Low cost

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DP 3

DP 2

DP 1

1

2

CONVERTER

3

4

5

6

+5V SUPPLY

DISPLAY TEST

5V RETURN

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 and 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 f or 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.

DC/DC

0 Vdc

+5V

–5V

CONVERTER

DATA

A/D

V+

0.01µF

V–

+2.0V

≈

1.23V
REF.

+5V

1

R2 is not used on ±200mV (-0) models or ±2V (-1) models.
R2 = 100k on ±20V

R2

12

(–) INPUT LO

1

R1

11

(+) INPUT HI

909k

10

ANALOG
COMMON

9

+1.23V REFERENCE OUT

1.82k

8

REFERENCE OUT

7

REFERENCE IN

models and 9.1k on ±200V (-3) models.

Figure 1. DMS-30PC Series Simplified Schematic

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

DMS-30PC

3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS

Performance/Functional Specifications

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

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 -- MΩ
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:

Blue display -- +400 +550 m A
All others -- +150 +225 m A

Low-Power Models:

Red display -- +12 +17 mA
Green or orange display -- +6 0 +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:

Blue display models 0 -- +50 °C
All other models 0 -- +60 °C

Storage Temperature –40 -- +75 °C
Humidity (Non-condensing) 0 -- 95 %
Case Material Polycarbonate
Weight 0.75 ounces (21 grams)

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.

Ordering Information

DMS-30PC -1 - RS

LED Color:

Input Range:

0 = ±200mV
1 = ±2V
2 = ±20V

3 = ±200V Available on the

following models only:

-GS (Standard Green)

-RS (Standard Red)

-RL (Low-Power Red)

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

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

Te chnical 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 cer tain 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.

AS = Standard Amber
BS = Standard 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

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