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DMS-30PC Series
31/2 Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters
FEATURES
Large (0.56"/14.2mm) LED display 8 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 +60C temperature range Numerous "plug-on" application boards Low cost
The DMS-30PC Series is a broad line of self-contained, fully operational, 31/2 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, blue-green, and super-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, epoxyencapsulated 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 application-specific instrument.
SIMPLIFIED SCHEMATIC DIAGRAM
1 +5V SUPPLY -5V 2 DISPLAY TEST DC/DC CONVERTER V- +2.0V 3 5V RETURN 0 Vdc A/D CONVERTER 1.23V REF. 9 +1.23V REFERENCE OUT 1.82k 5 DP 2 +5V 6 DP 1 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. 8 REFERENCE OUT 10 ANALOG COMMON 0.01F R2 (1) R1 909k 11 (+) INPUT HI +5V V+ 12 (-) INPUT LO
4 DP 3
DATA
For full details go to www.murata-ps.com/rohs
Figure 1. DMS-30PC Series simplified schematic
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MPM_DMS_30PC.F03 Page 1 of 6
DMS-30PC Series
Performance/Functional Specifications
Typical at TA = +25C and supply voltage = +5V using the single-ended input circuit, unless otherwise noted. Analog Inputs Full Scale Input Range: DMS-30PC-0 DMS-30PC-1 DMS-30PC-2 DMS-30PC-3 Input Impedence: DMS-30PC-0, -1 DMS-30PC-2, -3 Overvoltage Protection Common Mode Voltage Range CMRR (dc to 60Hz) Control Inputs Decimal Point Placement (Pins 4-6) Display Test (Pin 2) Performance Sampling Rate Accuracy (3 minute warm-up): DMS-30PC-0 (Vin = +0.19V) DMS-30PC-1 (Vin = +1.9V) DMS-30PC-2 (Vin = +19V) DMS-30PC-3 (Vin = +190V) Zero Reading (Vin = 0 Volts) Temperature Drift (0 = +60C) +1.23V Reference Output (Pin 9) Power Supply Requirements Supply Voltage Supply Current: Standard Models Low-Power Models Red Display Green or Orange Display Display Display Type and Size Polarity Indication Overrange Indication Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) Case Material Weight 0 -40 0 - - - +60 +75 95 C C % 31/2 digit, 0.56"/14.2mm high LED Autopolarity ("-" for negative Vin) "-1_ _ _ " for negative inputs "1_ _ _ " for positive inputs - - +12 +60 +17 +100 mA mA - +150 +225 mA +4.75 +5.00 +5.25 Volts - - - - "-001" - +1.20 1 1 2 2 "000" 0.2 +1.23 3 3 3 3 "001" 0.4 +1.25 Cnts/C Volts Counts Counts Counts Counts Add-On Application Boards: DMS-EB-C 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-RMS-C For true rms measurements of ac voltages DMS-EB-AC/DC-C For ac line-powered applications A panel-mount retaining clip is supplied with each model. 2.5 reading per second Tie to pin 3 to activate Tie to +5V to activate all segments - - - - - 100 0.8 - - - 1000 1 - - 86 - - 250 2 - M M Volts Volts dB 200 2 20 200 - - - - mV Volts Volts Volts Input Range: 0 = 200mV 1 = 2V 2 = 20V 3 = 200V 200V available on the following models only: -BS (Super Blue) -GS (Standard Green) -RS (Standard Red) -RL (Low-Power Red) -VFS (Blue-Green) Accessories: DMS-PS1-CM-C DMS-30-CP DMS-BZL1-C DMS-BZL2-C Min. Typ. Max. Units
31/2 Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters
Ordering Information
DMS-30PC - 1 - R S - C
Add -C for RoHS LED Color: AS = Standard Amber BS = Super Blue GS = Standard Green OS = Standard Orange QS = Standard Aqua RS = Standard Red YS = Standard Yellow RH = High-Intensity Red GL = Low-Power Green OL = Low-Power Orange RL = Low-Power Red VFS = Blue-Green +5V/1.0A AC/DC power supply module Panel cutout punch DMS-30 bezel assembly DMS-30 bezel assembly with sealing gasket
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 15A 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) or to your system's analog ground. 3. 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.
Polycarbonate 0.75 ounces (21 grams)
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. See Technical Notes.
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MPM_DMS_30PC.F03 Page 2 of 6
DMS-30PC Series
31/2 Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters
4. DISPLAY TEST (Pin 2): Connecting pin 2 to +5V SUPPLY (pin 1) will activate all LED segments, except the decimal points, and the display will read "1888" regardless of the actual applied input. If a negative input is applied, DISPLAY TEST will also activate the minus sign. To protect the LED's, the display should not be left in the "test" mode for more than 10 seconds. 5. 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 desired decimal point by tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal point location pins should be left open. Hard wiring is preferable, however, you can use logic gates to exercise dynamic control over the location of the decimal point if the following drive conditions are met: Model DMS-30PC-X-RL All Others Applied "0" Voltage Load Current* +0.05V max. +0.4V max. 0.7mA max. 6mA max.
APPLICATIONS
DMS-30PC meters are highly versatile devices that can be used in hundreds of applications. The application circuits chosen for this section have historically received many inquiries. Every attempt has been made to ensure technical accuracy, and all of the following circuits have been prototyped and tested to ensure functionality. Please keep in mind, however, that real-world applications are seldom as straightforward as the approaches presented here. Most applications have many more components -- and many more connections -- than the illustrations show. The simplified schematic shown in Figure 1 can be very useful when debugging a malfunctioning panel meter circuit, particularly if the user has some knowledge of operational amplifiers (op amps). The meter's high-impedance input consists of an op amp powered from a 5Vdc power supply (the -5V is internally generated). Knowing this, one can easily see why input signals applied to (-) INPUT LO and (+) INPUT HI have to be kept within the power supply rails of 5V. Also note that only pin 11 has a current-limiting 909k series resistor. High input voltages that have a common ground with pin 3 (5V RETURN) should only be applied to pin 11 ((+) INPUT HI) and never to pin 12. In these high-voltage cases, pin 12 should always be tied to pin 3 (5V RETURN). One of the simplified schematic's noteworthy features is that it shows internal voltage values. It also shows that pin 3 is the meter's zero-volt reference point -- regardless of the type of power or signal source used. This is an important point to keep in mind when a digital or analog multimeter is used to make system measurements. The multimeter's negative lead (usually the black one) must be connected to pin 3 (5V RETURN). 1. Single-Ended Input Configurations: True single-ended measurements can be made with any DMS-30PC meter. 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). This will ensure that large LED currents will not flow in the wiring that connects VIN to (-) INPUT LO (pin 12). Groundloop currents can cause unstable readings.
DMS-30PC-1
8 REF OUT
* The driving gates must be able to sink this much current (IOL) with a logic "0" output. 6. 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. The circuit shown in Figure 10 provides 10% range of adjustment. 7. Soldering Methods: All models in the DMS-30PC Series easily withstand most common wave soldering operations. We recommend, however, that 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 no-clean solders. 8. Suggested Mating Connectors: Panel mounted: Connector housing Terminal type Crimping tool Wire size Insulation diameter Stripping length Board mounted: Socket DATEL P/N 4320-01069-0 DATEL P/N 4400-01032-0 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 4320-01074-0
11 (+) IN HI
+
VIN
-
12 (-) IN LO 1 +5V SUP 6 DP1 3 5V RET 7 REF IN
85-264Vac
DATEL DMS-PS1-CM
AC to DC Converter
Figure 2. Single-Ended Input Configuration
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MPM_DMS_30PC.F03 Page 3 of 6
DMS-30PC Series
APPLICATIONS
2. Differential Input Configurations: Differential measurements can be made with all DMS-30PC 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.
DMS-30PC-1
REF OUT 8 R1 1k
31/2 Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters
pin 10 (ANALOG COMMON) or pin 3 (5V RETURN) 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.
DMS-30PC-1
8 REF OUT
11 (+) IN HI
11 (+) IN HI
+
REF IN 7 DP1 6 12 (-) IN LO
R2 1k
1.5V CELL
-
12 (-) IN LO 7 REF IN 1 +5V SUP 3 5V RET 6 DP1
1 +5V SUP
3 5V RET
R3 1k
85-264Vac
DATEL DMS-PS1-CM
85-264Vac
DATEL DMS-PS1-CM
AC to DC Converter
AC to DC Converter
Figure 3. Differential Input Configuration Figure 5. Floating Input Measurements
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 x VIN = Reading R1 + R2
+ DMS-30PC-1
8 REF OUT
11 (+) IN HI 10 ANA COMM 12 (-) IN LO 1 +5V SUP
+
DMS-30PC-1
8 REF OUT
1.5V CELL
- 7 REF IN 3 5V RET 6 DP1
85-264Vac
DATEL DMS-PS1-CM
AC to DC Converter R1 VIN R2 11 (+) IN HI
Figure 6. Floating Input Measurements (Alternate Configuration)
-
12 (-) IN LO 7 REF IN 1 +5V SUP 3 5V RET
85-264Vac
DATEL DMS-PS1-CM
AC to DC Converter
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-30PC 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 function of the scaling requirements of the particular application and can be calculated using the following equation: RShunt = R1 = VFsr / IFsr Where: VFsr = Full scale reading (in Volts) IFsr = Relative full scale current (in Amps)
Figure 4. Input Attenuation Circuit
4. Floating Signal Source Measurements: Floating signals can be measured using the circuits shown in Figures 5 and 6. Connecting
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MPM_DMS_30PC.F03 Page 4 of 6
DMS-30PC Series
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 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 "1000". For different full scale readings, alter the value of RShunt accordingly.
11 (+) IN HI 10 ANA COMM 12 (-) IN LO 9 1.23V REF 1 5V SUP 3 5V RET
31/2 Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters
and thermal run-away. When using other, higher-power, DMS-30PC models with three-terminal regulators, be sure to consult the regulator manufacturer's data sheet to ensure the regulator is being utilized safely and correctly. 7. 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 0.1 current shunt. The circuit shown represents a basic ammeter connection diagram. A detailed application note describing digital dc ammeters is included in DATEL's new Digital Panel Meter Databook.
1 +5V SUP
DMS-30PC-1
8 REF OUT
DMS-30PC-0
8 REF OUT
4-20mA
85-264Vac
6. Power Supply Monitoring: One of the most common digital panel meter applications involves monitoring the output voltage of the system power supply -- often this supply also powers the meter itself. The low-power, red LED DMS-30PC-2-RL can be configured to allow power supply monitoring over the range of 4.5-18Vdc. The circuit in Figure 8 uses a low-drop-out, three-terminal regulator (LM2931Z-5, available from National Semiconductor) to provide regulated 5V power to the meter. The LM-2931 was chosen because it has the following on-chip protection features: reverse polarity, short circuit
+
R1
+
5Vdc 7 REF IN
-
3 5V RET 6 DP1 7 REF IN 12 (-) IN LO 0.150V 1.5 Amp (Load Current) 11 (+) IN HI
R2
-
50k
DATEL DMS-PS1-CM
0.1W RShunt
Load (3.3 W)
AC to DC Converter
Figure 7. 4-to-20mA Current Loop Operation
Figure 9. Basic DC Ammeter Circuit
8. 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 10 shows the wiring configuration for each model. Calibration is performed with a precise, near-full-scale, input voltage.
11 (+) IN HI
DMS-30PC
OUT
VOLTAGE CALIBRATOR
COM
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
LM2931Z-5 IN OUT GND 4.5 - 18Vdc 22F 10V
(+) IN HI 11 1 +5V SUP
DMS-30PC-2-RL
+ -
+
3 5V RET 5 DP2 7 REF IN 8 REF OUT 12 (-) IN LO
Connections for 2V, 20V and 200V models
1k 10 to 20 Turns
8.45k, 1%
Connections for 200mV models
Figure 10. External Gain Adjustment Figure 8. 4.5-18V Power Supply Monitor
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MPM_DMS_30PC.F03 Page 5 of 6
DMS-30PC Series
MECHANICAL SPECIFICATIONS
MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC 0.02 (0.51) 3 PL DEC 0.010 (0.254) LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL RECOMMENDED PC BOARD FINISHED HOLE DIAMETER: 0.042 0.003 (1.067 0.076)
PIN 1
31/2 Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters
CALIBRATION POTENTIOMETER HOLE LOCATION
+5V SUPPLY DISPLAY TEST 5V RETURN DP3 DP2 DP1 1 2 3 4 5 6
FRONT VIEW
0.260 (6.60)
0.250 (6.35)
DP1 0.92 (23.4) 0.84 (21.3)
DP2 2.17 (55.1) 2.09 (53.1)
DP3
0.125 (3.175) DIAMETER (USE ONLY WHEN PC BOARD MOUNTING)
0.040 (1.02)
0.040 (1.02) 0.17 (4.3) TYP.
0.10 (2.5) TYP. 0.50 (12.7)
0.040 (1.02)
1.80 (45.7)
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
#2-56 INSERT 0.156 (3.96) DEEP 0.187 (4.75)
BEZEL INSTALLATION
2.55 (64.77)
BEZEL * Sealing gasket is supplied with the DMS-BZL2 and DMS-BZL4
0.116 (2.95)
INTERNAL CORNER RADII: 0.032 (0.81) MAX.
RETAINING CLIP INSTALLATION
1.07 (27.18)
DMS-BZL1 & BZL2 PANEL CUTOUT
0.878 (22.30)
2.118 (53.80) 2.35 (59.69) 0.093 (2.362) DIAMETER (4 REQUIRED)
(R) (R)
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
11/25/08
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2008 Murata Power Solutions, Inc.
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MADE IN USA
0.096 (2.44)
(R)
(R)
MADE IN USA
FRONT VIEW DMS-BZL1 and DMS-BZL2
1.270 (32.26)
DMS-30PC-X-XX
PIN #1 IDENTIFIER
MPM_DMS_30PC.F03 Page 6 of 6
(R)
(R)
MADE IN USA
12 11 10 9 8 7
(-) INPUT LO (+) INPUT HI ANALOG COMMON +1.23V REFERENCE OUT REFERENCE OUT REFERENCE IN
0.560 (14.22)
0.25 (6.4) TYP.
0.15 (3.7) TYP.
PANEL
GASKET *
PANEL

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