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Part: DMS-30LCD
Category:
Optoelectronics
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Description:
Company: Datel, Inc.
Datasheet: Download DMS-30LCD datasheet File size : 384 kB
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www.datel.com
DMS-30LCD Series
Actual Size
3˝ Digit, LCD Display Low-Power, Miniature Digital Panel Voltmeters
Offering all the outstanding features and benefits of DATEL's industry leading DMS-20LCD Series of 3˝ Digit LCD Panel Meters, DMS-30LCD meters offer larger, more easily readable displays at slightly higher power consumptions. Like all DMS Series LCD meters, these miniature (2.17" x 0.92" x 0.43"), epoxy-encapsulated devices offer component-like ease-of-use, outstanding reliability and easy installation in either panels or pc-cards. DMS-30LCD devices operate from a single +5V supply or a 9V battery. Batteryoperated units typically draw 350µA and consume a mere 3.2mW. Backlit models are available for low-light applications; though we have found many designers prefer DATEL's unique low-power LED meters in those circumstances. Offering 4 optional input voltage ranges (±200mV, ±2V, ±20V or ±200V), DMS30LCD meters have an extremely user-friendly input structure. They can be used in differential or single-ended modes. Input impedance is a minimum 800k. CMRR is typically 86dB. CMV is ±2V, and inputs are overvoltage protected to ±100V. Each meter incorporates an extremely stable, double regulated reference and is fully calibrated at our factory prior to encapsulation. We guarantee outstanding initial accuracy (±1 count) and excellent stability over temperature (±0.15 counts/°C). These extremely rugged meters are moisture and vibration proof and never require adjustment or recalibration. For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and K thermocouples, etc.), the DMS-30LCD Series includes a complete line of "plug-on" application boards that conveniently convert your meter into an application-specific instrument.
Features
· Large (0.4"/10.2mm), enhancedcontrast, LCD display · Single +5V supply or 9V battery · Power as low as 3.2mW · Miniature size: 2.17" x 0.92" x 0.43" 55mm x 23mm x 11mm · Epoxy-encapsulated, 12-pin DIP · Backlit displays optional · 4 differential input voltage ranges · High accuracy, ±1 count (±0.05%) · Autopolarity changeover and overrange indication · User-selectable decimal point placement · Numerous "plug-on" application boards · 0 to +60°C temperature range
+5V +5V SUPPLY/ 1 +BATTERY 5V
3
V+ R2
1
12
() INPUT LO
0.01µF V » +2.0V
DISPLAY TEST/ 2 BACKLIGHT
DC/DC 2 CONVERTER
R1 909k
11
(+) INPUT HI
5V RETURN/ 3 BATTERY
J1 0 Vdc
A/D CONVERTER DATA 1.23V REF.
10 ANALOG COMMON
DP 3
4 1.82k 5 +5V
9
+1.23V REFERENCE OUT
DP 2
8
REFERENCE OUT
DP 1
6
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.
2
DC/DC converter is not used on 9V-powered models, J1 is connected. Display Test function is not available on backlit models.
3
Figure 1. DMS-30LCD Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
DMS-30LCD
3˝ D I G I T, L C D D I S P L A Y D I G I T A L P A N E L V O L T M E T E R S
Performance/Functional Specifications
Typical at TA = +25°C and supply voltage = +5V (using the single-ended input circuit) or +9V (using the differential input circuit), unless otherwise noted. Analog Inputs Full Scale Input Range: DMS-30LCD-0 DMS-30LCD-1 DMS-30LCD-2 DMS-30LCD-3 Input Impedance: DMS-30LCD-0, -1 DMS-30LCD-2, -3 Overvoltage Protection DMS-30LCD-0, -1, -2 DMS-30LCD-3 Common Mode Voltage Range CMRR (dc to 60Hz) Control Inputs Decimal Point Placement (Pins 4-6): Functionality Logic Compatibility Display Test (Pin 2) Backlight (Pin 2) Performance Sampling Rate Accuracy (1 minute warm-up): DMS-30LCD-0 (VIN = +0.19) DMS-30LCD-1 (VIN = +1.9V) DMS-30LCD-2 (VIN = +19V) DMS-30LCD-3 (VIN = +190V) Zero Reading (VIN = 0 Volts) Temperature Drift (0 to +60°C) +1.23V Reference Out (Pin 9) Supply Voltage Supply Current: Standard Models Backlit Models ----" 001" -+1.20 +4.75 --2.5 samples per second ±1 ±1 ±2 ±2 "000" ±0.15 +1.23 +5.00 800 45 ±2 ±2 ±3 ±3 "001" ±0.3 +1.25 +5.25 1200 60 Cnts/°C Volts Volts µA mA Counts Counts Counts Counts Tie to pin 3 to activate TTL (on 5V-powered models) Tie to pin 1 to activate Tie to pin 3 to turn on backlight Accessories: DMS-30-CP DMS-BZL1 DMS-BZL2 RN-DMS DMS-PS1-CM Min. ----100 0.8 ----Typ. ±200 ±2 ±20 ±200 1000 1 ---86 Max. ------±100 ±250 ±2 -Units mV Volts Volts Volts M M Volts Volts Volts dB Input Range: 0 = ±200mV 1 = ±2V 2 = ±20V 3 = ±200V Leave blank for standard models. Add B for backlit models. Power Source: 5 = +5V 9 = +9V Panel cutout punch DMS-30 bezel assembly DMS-30 bezel assembly with sealing gasket Gain/offset potentiometer kit for DMS-EB, D M S - E B - A C / D C and DMS-EB-DC/DC +5V/1.0A AC/DC power supply module 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. Listed spec applies to 5V-powered models only. For 9V-powered models, both () INPUT LO (pin 12) and (+) INPUT HIGH (pin 11) must always be at least 1.5V above BATTERY (pin 3) and at least 1.5V below +BATTERY (pin 1). See Technical Notes.
Ordering Information
D M S - 30 LCD - 1 - 5
Power Supply Requirements (5V Models)
A d d - O n 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.
Power Supply Requirements (9V Models) Supply Voltage Supply Current: Standard Models Backlit Models Display Display Type and Size Polarity Indication Overrange Indication Physical/Environmental Operating Temperature Storage Temperature Humidity (Non-condensing) Case Material Weight 0 20 0 ---+60 +75 95 °C °C % 3˝ Digit LCD, 0.4"/10.2mm high Autopolarity ("" for negative VIN) "1_ _ _ " for negative VIN "1_ _ _ " for positive VIN +7.5 --+9.0 350 45 +14.0 600 60 Volts µA mA
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Technical 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 certain 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/ BATTERY) or to your system's analog ground.
Polycarbonate 0.75 ounces (21 grams)
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3˝ D I G I T, L C D D I S P L AY D I G I TA L PA N E L V O LT M E T E R S
DMS-30LCD
3. Decimal Point Placement: The location of the decimal point is user-selectable, and the decimal point control pins (DP1-DP3) are active low functions. Select the appropriate decimal point by tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN/ BATTERY). Unused decimal point location pins should be left open. For 5V-powered models, the decimal location pins are TTL compatible and may be hard wired as described above or driven with 5V TTL logic gates. 4. 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. 5. DISPLAY TEST (Pin 2): (Not available on backlit models) Connect DISPLAY TEST (pin 2) to +5V SUPPLY/+BATTERY (pin 1) to activate. All LCD segments, exclusive of the decimal points, will be momentarily enabled. Do not leave the unit in the TEST mode for more than 10 seconds as this will damage the LCD segments. 6. BACKLIGHT (Pin 2) Function: For backlit models, grounding pin 2 (i.e. connecting it to pin 3) turns on the backlighting LED's. 9V-powered backlit models function with supply voltages up to +14V, however, activating the backlight with voltages greater than 9.2V can damage the meter. Therefore, a 1/4 Watt series resistor must be installed between pins 3 and 2 in these situations. The value of the series resistor is determined using the following formula: +BATTERY 9.2V 0.035 Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V, RSeries = +12.6 9.2V 0.035 RSeries = 97 Ohms In any backlit application, including those with supply voltages < 9.2V, the current drawn by the backlight (and therefore the current drawn by the meter) can be reduced by installing a 1/4 Watt resistor between pins 3 and 2. The brightness of the backlight will be reduced proportionately. Ohms
recommend, however, you evaluate the effects your particular soldering techniques may have on the meter's plastic case and high-precision electrical performance. We recommend the use of water-soluble solders and thorough cleaning procedures. 9. Suggested Mating Connectors: Panel mounted: Connector housing Terminal type Crimping tool Wire size Insulation diameter Stripping length Board mounted: Socket DATEL P/N 39-2079400 DATEL P/N 39-2099090 DATEL P/N 39-2099000 22 to 26 AWG 0.062" (1.57mm) maximum 0.100 to 0.125" (2.54 to 3.17mm) DATEL P/N 39-2359625
Applications
DMS-30LCD meters are available in either 5V-powered or 9Vpowered models. 9V devices operate directly from 7.5V to 14V supplies (usually batteries) without the need for external voltage regulators. 9V devices, however, can not be used to measure voltages referenced to the negative battery terminal (pin 3) because the minus input to the meter (pin 12, () INPUT LO) must always be at least 1.5V above pin 3. 9V-powered meters can only be used to make differential and not single-ended measurements. 5V-powered devices operate from any well-regulated +5V supply and will accurately measure voltages both above and below pin 3 (5V RETURN) in either single-ended or differential configurations. 1. Single-Ended Input Configurations: True single-ended measurements can only be made with 5V-powered meters. The circuit of Figure 2 avoids problems normally associated with ground-loop currents. Separate ground runs should be used for 5V RETURN (pin 3) and () INPUT LO (pin 12).
RSeries =
Ohms
+ V
IN
11 (+ ) IN H I
D M S -3 0 L C D -1 -5
8 RE. OUT
7. Gain Adjust: There is a gain-adjust potentiometer on the back of each meter. It has approximately ±50 counts (±2.5%) of adjustment range. Since these devices essentially have no zero/ offset errors, a gain adjustment is effectively an overall accuracy adjustment. Though they may be performed at any point (except zero), accuracy adjustments are most effective when performed with higher level input signals. Refer to Figure 9 for applications requiring greater ( ±10%) gain adjustments. 8. Soldering Methods: All models in the DMS-30LCD Series easily withstand most common wave soldering operations. We
12 ( ) IN L O +5V SUP 1 6 DP1 3 5V RET
7 R E . IN
8 5 -2 6 4 V a c
DATEL D M S -P S 1 -C M
A C to D C C o n v e rte r
Figure 2. Single-Ended Input Configuration (5V-Powered Models)
3
DMS-30LCD
3˝ D I G I T, L C D D I S P L A Y D I G I T A L P A N E L V O L T M E T E R S
Applications
2. Differential Input Configurations: Differential measurements can be made with either 5V-powered or 9V-powered meters. Figure 3, though not a practical real-world application, uses a voltage divider to demonstrate the concept of a differential input signal. Be careful not to exceed the ±2V common mode voltage limitation for 5V-powered meters.
D M S -3 0 L C D -1 -5
8 R1 1k
4. Floating Signal Source Measurements: Floating signals can be measured using the circuits shown in Figures 5 and 6. Figure 5 uses a 5V-powered meter. Figure 6 uses a 9V-powered meter. Connecting pin 10 (ANALOG COMMON) to () INPUT LO (pin 12) provides the reference point for the meter's input. A "floating" input is a signal that has no galvanic connection to the meter's power supply. In the figures below, the 1.5V battery illustrates a true floating input.
RE. OUT
11 (+ ) IN H I
R E . IN 7 6 DP1
12 ( ) IN L O
R2 1k
11 (+ ) IN H I 1 .5 V CELL 10 ANA COMM 12 ( ) IN L O
+
D M S -3 0 L C D -1 -5
8 RE. OUT
1 +5V SUP
3 5V RET
R3 1k
7 1 +5V SUP 3 6 DP1 5V RET
R E . IN
8 5 -2 6 4 V a c
DATEL D M S -P S 1 -C M
DATEL D M S -P S 1 -C M
A C to D C C o n v e rte r
8 5 -2 6 4 V a c
Figure 3. Differential Input Configuration (5V-Powered Models)
A C to D C C o n v e rte r
Figure 5. Floating Input Measurements (5V-Powered Models)
3. Engineering Scaling: For measuring voltages greater than the full scale input range of a given meter, the input signal must be attenuated. A simple voltage divider (similar to that shown in Figure 4) will scale the input to within the range of the selected meter. R1 and R2 should be precision, ±1%, metal-film resistors with absolute TCR's less than 50ppm/°C. See Ap Note 4 for more information on engineering scaling. 50k < R1 + R2 < 10M R2 R1 + R2
+
11 (+) IN HI 10 ANA COMM 12 () IN LO 1 + BAT +
+
DMS-30LCD-1-9
8 REF OUT
1.5V CELL
7 REF IN 3 BAT 6 DP1
x VIN = Reading
9V BATTERY
R1 V
IN
11 (+ ) IN H I
D M S -3 0 L C D -1 -5
8 RE. OUT
Figure 6. Floating Input Measurements (9V-Powered Models)
R2
( ) IN
12 LO 7 1 3 5V RET +5V SUP
R E . IN
8 5 -2 6 4 V a c
DATEL D M S -P S 1 -C M
5. Process Control (4-to-20mA) Measurements: In many common process-control applications, a 4-to-20mA current loop is used to transmit information. Because DMS-30LCD meters have such high input impedance, a simple shunt resistor across the meter's input can be used to convert the loop current to a voltage. See Figure 7. The value of the shunt resistor is a
AC
to D C
C o n v e rte r
Figure 4. Input Attenuation Circuit
4
3˝ D I G I T, L C D D I S P L AY D I G I TA L PA N E L V O LT M E T E R S
DMS-30LCD
Applications
function of the scaling requirements of the particular application and can be calculated using the following equation: RShunt = R1 = VFsr / I Fsr Where: VFsr = Full scale reading (in Volts) I Fsr = Relative full scale current (in Amps) Example: For a meter with a 2V full scale input (1.999 full scale reading) and a desired full scale 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 50k 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 "1999". For different full scale readings, alter the RShunt value accordingly.
R2 = 0.1 (R1 + R2 + R3) Therefore, the 9V battery voltage appears to the meter inputs as 0.9V. With the decimal point moved to its DP2 position (pin 5 tied to pin 3), the meter reads 9.00 Volts. The circuit can be calibrated by first measuring the actual battery voltage with another meter and then adjusting the gainadjust potentiometer on the back of the DMS-30LCD until a similar reading is obtained. If possible, the resistors in the divider should be ±1% metal-film types with TCR's less than 50ppm/°C.
DMS-30LCD-1-9
8 REF OUT 11 (+) IN HI R1 45.3k
12 () IN LO 7 REF IN 1 +BAT 9V BATTERY + 3 BAT 5 DP2
R2 10.1k
R3 45.3k
D M S -3 0 L C D -1 -5
(+ ) IN H I + 4 -2 0 m A R1 50k DATEL D M S -P S 1 -C M 8 5 -2 6 4 V a c ANA COMM 7 R E . IN 1 +5V SUP 3 5V RET 8 RE. OUT
Figure 8. Power Supply Monitor (9V-Powered Models)
( ) IN L O
R2
7. External Gain Adjustment: Connect REFERENCE OUT (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, operation. Use the +1.23V REFERENCE OUT (pin 9) for applications needing external gain adjustment. Figure 9 shows the wiring configuration for each model. Calibration is performed with a precise, near-full-scale, input voltage.
A C to D C C o n v e rte r
Figure 7. 4-to-20mA Current Loop Operation (5V-Powered Models)
12
OUT VOLTAGE CALIBRATOR
COM
11 (+) IN HI
DMS-30LCD
3 5V RET 12 () IN LO 10 ANA COMM 8 NC 8.45k, 1% 1k 10 to 20 Turns 7 REF IN 9 1.23V REF
6. Power Supply Monitoring: A popular application for DATEL's low-power LCD meters is monitoring the supply voltage in battery-operated portable equipment. Figure 8 demonstrates how a 9V-powered DMS-30LCD can be used to monitor its own supply. The meter used is the DMS-30LCD-1-9. A three-resistor voltage divider is used to attenuate the battery voltage and also to satisfy the requirement that the input voltages applied to pins 12 and 11 be at least 1.5 Volts above and below the battery voltage applied to pins 1 (+BATTERY) and 3 (BATTERY). The divider should be designed so that 1/10th the battery voltage falls across the inputs to the meter:
For 5V models tie () IN LO to pin 3
Connections for ±2V and ±20V models
For 9V models tie () IN LO to pin 10 1k 10 to 20 Turns 8.45k, 1%
Connections for ±200mV models
Figure 9. External Gain Adjustment
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