DMS30PC Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS

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®
DMS-30PC Series
Actual Size
3½ Digit, LED Display
Low-Power, Miniature
Digital Panel Voltmeters
Features
• Large (0.56"/14.2mm) LED display
• 7 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
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 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 applica-
tion-specific instrument.
1
+5V SUPPLY
2
DISPLAY TEST
3
5V RETURN
4
DP 3
5
DP 2
6
DP 1
+5V
V+
–5V
DC/DC
CONVERTER
V–
0 Vdc
A/D
CONVERTER
DATA
0.01µF
≈+2.0V
1.23V
REF.
1
R2
R1
909k
12
(–) INPUT LO
11
(+) INPUT HI
10 _ANALOG
COMMON
1.82k
9
+1.23V REFERENCE OUT
8
REFERENCE OUT
+5V
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.
Figure 1. DMS-30PC Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com