廬
廬
DMS-30PC Series
Actual Size
3錕?frac12; Digit, LED Display
Low-Power, Miniature
Digital Panel Voltmeters
The DMS-30PC Series is a broad line of self-contained, fully operational, 3錕?frac12;
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 (鹵200mV,
鹵2V, 鹵20V and 鹵200V). Input impedance is 1,000 megohms for the 鹵200mV and
鹵2V inputs and 1 megohm for the 鹵20V and 鹵200V inputs. CMRR for all devices is
86dB, and inputs are overvoltage protected to 鹵250V.
Each meter incorporates an extremely stable, double-regulated reference and is
fully calibrated prior to potting. We guarantee outstanding initial accuracy (鹵1 count)
and excellent stability (鹵0.15 counts/擄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.
Features
鈥?/div>
Large (0.56"/14.2mm) LED display
鈥?/div>
7 LED colors
鈥?/div>
Low-power LED鈥檚 optional
鈥?/div>
Epoxy-encapsulated, 12-pin DIP with
built-in color filter and bezel
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Miniature size:
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
鈥?/div>
Auto-calibration, 鹵1 count accuracy
鈥?/div>
User-selectable decimal point placement
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Single +5V supply (60mW for low-power
models)
鈥?/div>
0 to +60擄C temperature range
鈥?/div>
Numerous "plug-on" application
boards
鈥?/div>
Low cost
1
+5V SUPPLY
+5V
V+
1
12
(鈥? INPUT LO
0.01碌F
R2
R1
11
(+) INPUT HI
909k
鈮?2.0V
10 ANALOG
COMMON
1.23V
REF.
9
+1.23V REFERENCE OUT
1.82k
鈥?V
2
DISPLAY TEST
DC/DC
CONVERTER
V鈥?/div>
3
5V RETURN
0 Vdc
A/D
CONVERTER
4
DP 3
DATA
5
DP 2
+5V
6
DP 1
1
8
REFERENCE OUT
7
REFERENCE IN
R2 is not used on 鹵200mV (-0) models or 鹵2V (-1) models.
R2 = 100k on 鹵20V (-2) models and 9.1k on 鹵200V (-3) models.
Figure 1. DMS-30PC Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA)
鈥?/div>
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
鈥?/div>
Email: sales@datel.com
鈥?/div>
Internet: www.datel.com
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