PDF DMS-30DR Data sheet ( Hoja de datos )

Número de pieza	DMS-30DR
Descripción	Digit Panel Meters
Fabricantes	Delta Electronics
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No Preview Available ! DMS-30DR Series Daylight Readable, 3½ Digit Panel Meters with Auto-Dimming LED Displays PATENT PENDING FEATURES ■ Super-bright LED displays are readable in direct sunlight! ■ Autodim circuitry automatically adjusts display brightness ■ Includes external brightness adjustment ■ Large (0.56”/14.2mm) easy-to-read red LED display ■ High reliability alternative to LCD displays ■ Ideal for automotive, industrial, and marine applications ■ Encapsulated package mounts in panels or pc-boards ■ Miniature housing: 2.17” x 0.92” x 0.56” (55mm x 23mm x 14mm) ■ 4 differential input ranges provide ±1 count accuracy ■ Single +5V supply; Less than 1-Watt power consumption ■ 0 to +60°C operating temperature range C&D Technologies’ new DMS-30DR Series are the ﬁrst digital panel meters to offer LED displays that are readable in direct sunlight—no special ﬁlters or shading devices are required. Their Autodim circuit automatically adjusts the display’s 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’ 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—that’s 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: ±200mV, ±2V, ±20V and ±200V. Input impedance is 1,000 megohms for the ±200mV and ±2Vwiwnwp.DuattsaSahneedt4U1.cmomegohm for the ±20V and ±200V inputs. CMRR for all devices is 86dB, and inputs are overvoltage protected to ±250V. Each meter incorporates a precision, ultra-stable voltage reference and is factory calibrated prior to encapsulation. The small size (2.17” x 0.92” x 0.56”) 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’s 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 ﬁlter and bezel, and is easily mounted in either panels or pc boards. 1 +5V SUPPLY EXTERNAL BRIGHTNESS 2 ADJUSTMENT 3 5V RETURN 4 DP 3 5 DP 2 6 DP 1 www.cd4power.com +5V +5V DC/DC CONVERTER +5V –5V 0 Vdc –5V –5V A/D CONVERTER DATA LIGHT SENSOR 0.01µF 1.225V REF. R2 (1) R1 909k 12 (–) INPUT LO 11 (+) INPUT HI 10 ANALOG COMMON 1.82k 9 +1.225V 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-30DR Simpliﬁed Schematic DIGITAL PANEL METERS MPM_DMS-30DR_A01 Page 1 of 6 1 page DMS-30DR Series SUNLIGHT READABLE, AUTO-DIMMING LED DISPL AY METERS APPLICATIONS 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 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. �� �� �� �� �� �� �� �� �� � �� �� � �� � �� �� � �� � �� � �� �� �� Figure 7. 4-to-20mA Current Loop Operation 6. 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 available at www.cd4power.com. � �� � � �� � �� �� � �� �� �� �� �� �� �� �� �� �� � �� � �� Figure 8. Basic DC Ammeter Circuit 7. External Gain Adjustment: Connect REFERENCE OUT (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, operation. Use the +1.225V REFERENCE OUT (pin 9) for applica- tions needing external gain adjustment. Figure 10 shows the wiring configuration for each model. Calibration is performed with a precise, near-full-scale, input voltage. �� �� �� �� �� �� � �� �� �� �� �� �� � �� �� �� �� �� �� �� �� �� �� �� �� �� Figure 9. External Gain Adjustment www.cd4power.com DIGITAL PANEL METERS MPM_DMS-30DR_A01 Page 5 of 6 5 Page

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