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C&D Technologies鈥?new DMS-30DR Series are the 鏗乺st digital panel meters to offer LED
displays that are readable in direct sunlight鈥攏o special 鏗乴ters or shading devices are required.
Their Autodim circuit automatically adjusts the display鈥檚 brightness to suit viewing environments
ranging from total darkness to full, brilliant sunlight. A user-accessible brightness adjustment pin
enables custom intensity settings or display matching in multiple display applications. Washed
out, hard-to-read digital readouts are a thing of the past!
Until now, users whose instrumentation required daylight visibility had to settle for less
reliable LCD display technology. However, in order to remain legible in low ambient light, LCDs
require complex, power-hungry backlighting circuitry. And, these displays typically suffer from
very narrow viewing angles. In contrast, DMS-30DR Series LED-based displays鈥?power consump-
tion drops as ambient light decreases, and their viewing angle extends to nearly 180 degrees
vertically and horizontally.
All models operate from a single +5V supply, and draw as little as 7mA when operated in total
darkness鈥攖hat鈥檚 less than 1/10 Watt. At maximum brightness power consumption is typically
less than 200mA (1 Watt). DMS-30DR voltmeters 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 a precision, ultra-stable
voltage reference and is factory calibrated prior to encapsulation.
The small size (2.17鈥?x 0.92鈥?x 0.56鈥? of DMS-30DR meters is achieved by integrating their
display, Autodim display drivers, light sensor, reference circuit, and A/D converter into in a rugged
epoxy-encapsulated assembly. The device鈥檚 12-pin, component-like, DIP package is both vibra-
tion and moisture proof, making them ideal for harsh environments. Each package incorporates a
built-in color 鏗乴ter and bezel, and is easily mounted in either panels or pc boards.
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+5V SUPPLY
+5V
+5V
12
0.01碌F
(鈥? INPUT LO
R2
(1)
EXTERNAL BRIGHTNESS
ADJUSTMENT
2
DC/DC
CONVERTER
+5V
鈥?V
鈥?V
R1
909k
11
(+) INPUT HI
5V RETURN
3
鈥?V
A/D
CONVERTER
10 ANALOG
COMMON
1.225V
REF.
1.82k
DP 3
4
0 Vdc
DATA
9
+1.225V REFERENCE OUT
DP 2
5
LIGHT
SENSOR
8
+5V
REFERENCE OUT
DP 1
6
7
REFERENCE IN
(1)
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-30DR Simpli鏗乪d Schematic
DIGITAL PANEL METERS
MPM_DMS-30DR_A01
Page 1 of 6
www.cd4power.com
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