DMS-30PC Series www.murata-ps.com 3½ Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters FEATURES The DMS-30PC Series is a broad line of self-contained, fully operational, 3½ digit volt- Large (0.56"/14.2mm) LED display meters 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 8 LED colors super-blue. A high-intensity version of the red display is optional, as are low-power versions Low-power LED’s optional of the red, orange, and green displays. Epoxy-encapsulated, 12-pin DIP with built-in color fi lter The small size (2.17" x 0.92" x 0.56") of DMS-30PC meters is achieved by integrating and bezel their display, display drivers, reference circuit, and A/D converter into in a single, epoxy- Miniature size: encapsulated assembly. The device's 12-pin, component-like, DIP package is both vibration 2.17" x 0.92" x 0.56"(55mm x 23mm x 14mm) and moisture proof. Each package incorporates a built-in color fi lter and bezel and is easily mounted in either panels or pc cards. Panel or pc-board mountable These meters are available in four differential input voltage ranges (±200mV, ±2V, ±20V 4 differential input voltage ranges and ±200V). Input impedance is 1,000 megohms for the ±200mV and ±2V inputs and 1 Auto-calibration, ±1 count accuracy megohm for the ±20V and ±200V inputs. CMRR for all devices is 86dB, and inputs are over- User-selectable decimal point placement voltage protected to ±250V. Each meter incorporates an extremely stable, double-regulated reference and is fully Single +5V supply (60mW for low-power models) calibrated prior to potting. We guarantee outstanding initial accuracy (±1 count) and excellent 0 to +60°C temperature range stability (±0.15 counts/°C). All models operate from a single +5V supply, and the low-power Numerous "plug-on" application boards models draw as little as 10mA (50mW total power). A DISPLAY TEST function is standard on each device. Low cost For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and K ther- mocouples, etc.), the DMS-30PC Series includes a complete line of optional "plug-on" appli- cation boards that conveniently convert your meter into an application-specifi c instrument. SIMPLIFIED SCHEMATIC DIAGRAM +5V 1 V+ 12 +5V SUPPLY (–) INPUT LO (1) R2 –5V 0.01µF 2 DC/DC R1 11 DISPLAY TEST (+) INPUT HI CONVERTER V– 909k »+2.0V 3 A/D 10 ANALOG 5V RETURN 0 Vdc CONVERTER COMMON 1.23V DATA REF. 4 9 DP 3 +1.23V REFERENCE OUT 1.82k 5 8 DP 2 REFERENCE OUT +5V 6 7 DP 1 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-30PC Series simplifi ed schematic For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM_DMS_30PC.G01 Page 1 of 6

DMS-30PC Series 3½ Digit, LED Display Low-Power, Performance/Functional Specifi cations Miniature Digital Panel Voltmeters Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit, unless otherwise noted. Analog Inputs Min. Typ. Max. Units Ordering Information Full Scale Input Range: DMS-30PC-0 – ±200 – mV DMS-30PC-1 - RS - C DMS-30PC-1 – ±2 – Volts Add -C for RoHS DMS-30PC-2 – ±20 – Volts Input Range: 0 = ±200mV LED Color: DMS-30PC-3 – ±200 – Volts 1 = ±2V AS = Standard Amber Input Impedence: – 2 = ±20V BS = Super Blue 3 = ±200V GS = Standard Green DMS-30PC-0, -1 100 1000 – MΩ OS = Standard Orange ±200V available on the DMS-30PC-2, -3 0.8 1 – MΩ following models only: QS = Standard Aqua RS = Standard Red Overvoltage Protection ➀ – – ±250 Volts -BS (Super Blue) YS = Standard Yellow -GS (Standard Green) Common Mode Voltage Range – – ±2 Volts RH = High-Intensity Red -RS (Standard Red) GL = Low-Power Green CMRR (dc to 60Hz) – 86 – dB -RL (Low-Power Red) OL = Low-Power Orange -VFS (Blue-Green) Control Inputs ➁ RL = Low-Power Red VFS = Blue-Green Decimal Point Placement (Pins 4-6) Tie to pin 3 to activate A panel-mount retaining clip is supplied with each model. Display Test (Pin 2) Tie to +5V to activate all segments Performance See www.murata-ps.com/dpm-availability for model-specifi c availability. Sampling Rate 2.5 reading per second Accuracy (3 minute warm-up): Accessories: DMS-30PC-0 (Vin = +0.19V) – ±1 ±3 Counts DMS-30-CP Panel cutout punch DMS-BZL1-C DMS-30 bezel assembly DMS-30PC-1 (Vin = +1.9V) – ±1 ±3 Counts DMS-BZL2-C DMS-30 bezel assembly with sealing gasket DMS-30PC-2 (Vin = +19V) – ±2 ±3 Counts DMS-30PC-3 (Vin = +190V) – ±2 ±3 Counts Add-On Application Boards: DMS-EB-C Multi-purpose (gain/offset, 4-20mA, etc.) Zero Reading (Vin = 0 Volts) “–001” “000” “001” DMS-EB-HTB High-accuracy temperature probe sensing for Temperature Drift (0 = +60°C) – ±0.2 ±0.4 Cnts/°C ±200mV models DMS-EB-DC/DC Provides isolated +5V power +1.23V Reference Output (Pin 9) ➁ +1.20 +1.23 +1.25 Volts DMS-EB-RMS-C For true rms measurements of ac voltages Power Supply Requirements DMS-EB-AC/DC-C For ac line-powered applications Supply Voltage +4.75 +5.00 +5.25 Volts TECHNICAL NOTES Supply Current: Standard Models – +150 +225 mA 1. +1.23V REFERENCE OUTPUT (Pin 9): This pin is the output of the Low-Power Models meter’s precision +1.23V internal reference, and it is referenced to ANALOG COMMON (pin 10) which sits at a potential of approxi- Red Display – +12 +17 mA mately +2V. This output should be buffered if used to drive exter- Green or Orange Display – +60 +100 mA nal loads since sourcing more than 15μA from pin 9 can affect Display both the initial accuracy and temperature drift of the meter. Display Type and Size 3½ digit, 0.56"/14.2mm high LED 2. ANALOG COMMON (Pin 10): This pin is connected to an internal, Polarity Indication Autopolarity ("–" for negative Vin) low-noise, "relative" ground. It is used in certain differential and Overrange Indication "–1___" for negative inputs "fl oating" measurements as described in the Applications section "1___" for positive inputs of this data sheet and Ap Note DMS-AN3 at Physical/Environmental http://www.murata-ps.com/data/meters/dms-an3.pdf. Pin 10 Operating Temperature 0 – +60 °C should not be connected to pin 3 (5V RETURN) or to your system’s analog ground. Storage Temperature –40 – +75 °C Humidity (non-condensing) 0 – 95 % 3. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci- sion reference actively trimmed at the factory. In normal operation, Case Material Polycarbonate pin 8 must be tied to pin 7 to achieve all listed accuracy and drift Weight 0.75 ounces (21 grams) specifi cations. ➀ 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. ➁ See Technical Notes. www.murata-ps.com/support MPM_DMS_30PC.G01 Page 2 of 6

DMS-30PC Series 3½ Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters APPLICATIONS 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 DMS-30PC meters are highly versatile devices that can be used in will read "1888" regardless of the actual applied input. If a negative hundreds of applications. The application circuits chosen for this sec- input is applied, DISPLAY TEST will also activate the minus sign. To tion have historically received many inquiries. Every attempt has been protect the LED's, the display should not be left in the "test" mode for made to ensure technical accuracy, and all of the following circuits more than 10 seconds. have been prototyped and tested to ensure functionality. Please keep 5. Decimal Point Placement: The location of the decimal point is user- in mind, however, that real-world applications are seldom as straight- selectable, and the decimal point control pins (DP1-DP3) are active forward as the approaches presented here. Most applications have low functions. Select the desired decimal point by tying the appropri- many more components — and many more connections — than the ate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal point illustrations show. location pins should be left open. The simplifi ed schematic shown in Figure 1 can be very useful when Hard wiring is preferable, however, you can use logic gates to debugging a malfunctioning panel meter circuit, particularly if the exercise dynamic control over the location of the decimal point if the user has some knowledge of operational amplifi ers (op amps). The following drive conditions are met: meter's high-impedance input consists of an op amp powered from a ±5Vdc power supply (the –5V is internally generated). Knowing this, Model Applied "0" Voltage Load Current* one can easily see why input signals applied to (–) INPUT LO and (+) DMS-30PC-X-RL +0.05V max. 0.7mA max. INPUT HI have to be kept within the power supply rails of ±5V. Also All Others +0.4V max. 6mA max. note that only pin 11 has a current-limiting 909kΩ series resis- tor. High input voltages that have a common ground with pin 3 (5V *The driving gates must be able to sink this much current RETURN) should only be applied to pin 11 ((+) INPUT HI) and never to (I ) with a logic "0" output. OL pin 12. In these high-voltage cases, pin 12 should always be tied to pin 3 (5V RETURN). 6. Gain Adjust: There is a gain-adjust potentiometer on the back of One of the simplifi ed schematic's noteworthy features is that it each meter. It has approximately ±50 counts (±2.5%) of adjustment shows internal voltage values. It also shows that pin 3 is the meter's range. Since these devices essentially have no zero/offset errors, zero-volt reference point — regardless of the type of power or signal a gain adjustment is effectively an overall accuracy adjustment. source used. This is an important point to keep in mind when a digital Though they may be performed at any point (except zero), accuracy or analog multimeter is used to make system measurements. The adjustments are most effective when performed with higher level multimeter's negative lead (usually the black one) must be connected input signals. The circuit shown in Figure 10 provides ±10% range of to pin 3 (5V RETURN). adjustment. 7. Soldering Methods: All models in the DMS-30PC Series easily 1. Single-Ended Input Confi gurations: True single-ended measure- withstand most common wave soldering operations. We recommend, ments can be made with any DMS-30PC meter. The circuit of Figure however, that you evaluate the effects your particular soldering 2 avoids problems normally associated with ground-loop currents. techniques may have on the meter's plastic case and high-precision Separate ground runs should be used for 5V RETURN (pin 3) and (–) electrical performance. We recommend the use of no-clean solders. INPUT LO (pin 12). This will ensure that large LED currents will not 8. Suggested Mating Connectors: fl ow in the wiring that connects VIN to (–) INPUT LO (pin 12). Ground- loop currents can cause unstable readings. Panel mounted: Connector housing Murata Power Solutions P/N 4320-01069-0 DMS-30PC-1 Terminal type Murata Power Solutions P/N 4400-01032-0 11 8 Crimping tool Murata Power Solutions P/N 39-2099000 + (+) IN HI REF OUT VIN Wire size 22 to 26 AWG – Insulation diameter 0.062" (1.57mm) maximum 12 7 (–) IN LO REF IN Stripping length 0.100 to 0.125" (2.54 to 3.17mm) 1 6 3 +5V SUP DP1 5V RET Board mounted: Socket Murata Power Solutions P/N 4320-01074-0 85-264Vac AC to DC Converter Figure 2. Single-Ended Input Confi guration www.murata-ps.com/support MPM_DMS_30PC.G01 Page 3 of 6

DMS-30PC Series 3½ Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters APPLICATIONS 2. Differential Input Confi gurations: Differential measurements can 10 (ANALOG COMMON) or pin 3 (5V RETURN) to (–) INPUT LO (pin 12) be made with all DMS-30PC meters. Figure 3, though not a practi- provides the reference point for the meter's input. cal real-world application, uses a voltage divider to demonstrate the A "fl oating" input is a signal that has no galvanic connection to the concept of a differential input signal. Be careful not to exceed the ±2V meter's power supply. In the fi gures below, the 1.5V battery illustrates common mode voltage limitation for 5V-powered meters. a true fl oating input. DMS-30PC-1 R1 REF OUT 8 1(+1) IN HI 1k 11 DMS-30PC-1 8 (+) IN HI REF OUT REF IN 7 R2 1.5V + 1(–2) IN LO 1k CELL – 12 DP1 6 (–) IN LO 7 R3 REF IN +5V SU1P 35V RET 1k 1 3 6 +5V SUP 5V RET DP1 85-264Vac 85-264Vac AC to DC Converter AC to DC Converter Figure 3. Differential Input Confi guration 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 attenu- DMS-30PC-1 11 ated. A simple voltage divider (similar to that shown in Figure 4) will 8 (+) IN HI REF OUT scale the input to within the range of the selected meter. R1 and R2 10 + should be precision, ±1%, metal-fi lm resistors with absolute TCR's 1.5V ANA COMM CELL less than 50ppm/°C. See Ap Note 4 for more information on engineer- – 12 7 ing scaling. (–) IN LO REF IN 1 3 6 50kΩ < R1 + R2 < 10MΩ +5V SUP 5V RET DP1 R2 x V = Reading IN R1 + R2 85-264Vac + AC to DC Converter R1 DMS-30PC-1 11 Figure 6. Floating Input Measurements (+) IN HI 8 VIN REF OUT (Alternate Confi guration) R2 12 (–) IN LO 5. Process Control (4-to-20mA) Measurements: In many common – 7 REF IN process-control applications, a 4-to-20mA current loop is used to 1 3 transmit information. Because DMS-30PC meters have such high +5V SUP 5V RET 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 85-264Vac value of the shunt resistor is a function of the scaling requirements of the particular application and can be calculated using the following AC to DC Converter equation: Figure 4. Input Attenuation Circuit R = R1 = V /I Shunt Fsr Fsr Where: V = Full scale reading (in Volts) 4. Floating Signal Source Measurements: Floating signals can be Fsr measured using the circuits shown in Figures 5 and 6. Connecting pin IFsr = Relative full scale current (in Amps) www.murata-ps.com/support MPM_DMS_30PC.G01 Page 4 of 6

DMS-30PC Series 3½ Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters APPLICATIONS Example: For a meter with a 2V full scale input (1.999 full and thermal run-away. When using other, higher-power, DMS-30PC scale reading) and a desired display reading of models with three-terminal regulators, be sure to consult the regula- "1000" (with an input of 20mA), V = 1.000 Volts tor manufacturer's data sheet to ensure the regulator is being utilized Fsr safely and correctly. R = 1.000V/(0.020 – 0.004)A Shunt 7. Digital Ammeter: Digital ammeters are fi nding ever-increasing R = 1.000V/0.016A = 62.5 Ohms Shunt usage because analog-style ammeters (moving-vane types) now cost roughly the same as their digital counterparts. Additionally, analog To calibrate the circuit of Figure 7, perform the following: ammeters are not nearly as rugged as modern digital panel voltme- 1. With 4mA applied, adjust the 50kΩ potentiometer (R2) to ters. Figure 9 illustrates a typical ammeter application. The circuit display a reading of "000" (assuming that is the desired uses a ±200mV input meter reading). — the preferred range for most ammeters — to measure the voltage 2. With 20mA applied, adjust the gain-adjust potentiometer on developed across a 0.1Ω current shunt. The circuit shown represents the back of the meter to display a reading of "1000". For a basic ammeter connection diagram. A detailed application note different full scale readings, alter the value of R accordingly. describing digital dc ammeters is included in Murata Power Solutions' Shunt new Digital Panel Meter Databook. DMS-30PC-1 11 8 + (+) IN HI REF OUT +5V SU1P DMS-30PC-0 10 8 ANA COMM + REF OUT 5Vdc 4-20mA R1 (–) IN L1O2 7REF IN – 5V RET3 7 REF IN 9 1 3 6 1.23V 5V SUP 5V RET DP1 12 11 R2 REF (–) IN LO (+) IN HI – 50k 0.150V 1.5 Amp (Load Current) 85-264Vac 0.1W Load RShunt (3.3 W ) AC to DC Converter Figure 9. Basic DC Ammeter Circuit Figure 7. 4-to-20mA Current Loop Operation 8. External Gain Adjustment: Connect REFERENCE OUT 6. Power Supply Monitoring: One of the most common digital panel (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, opera- meter applications involves monitoring the output voltage of the tion. Use the +1.23V REFERENCE OUT (pin 9) for applications needing system power supply — often this supply also powers the meter external gain adjustment. Figure 10 shows the wiring confi guration itself. The low-power, red LED DMS-30PC-2-RL can be confi gured for each model. Calibration is performed with a precise, near-full- to allow power supply monitoring over the range of 4.5-18Vdc. The scale, input voltage. circuit in Figure 8 uses a low-drop-out, three-terminal regulator (LM- 2931Z-5, available from National Semiconductor) to provide regulated 11 DMS-30PC (+) IN HI 5V power to the meter. The LM-2931 was chosen because it has the OUT following on-chip protection features: reverse polarity, short circuit VOLTAGE 3 CALIBRATOR 5V RET 12 COM (+) IN HI (–) IN LO LM2931Z-5 11 DMS-30PC-2-RL 10 8 7 9 1 ANA COMM NC REF IN 1.23V REF +5V SUP IN OUT + GND + 5V RET3 8.45k, 1% Connections 4.5 - 18Vdc for ±2V, ±20V – 22µF 1k and ±200V models 10V 5 10 to 20 Turns DP2 Connections 7 8 12 1k 8.45k, 1% for ±200mV REF REF (–) IN LO 10 to 20 Turns models IN OUT Figure 10. External Gain Adjustment Figure 8. 4.5-18V Power Supply Monitor www.murata-ps.com/support MPM_DMS_30PC.G01 Page 5 of 6

DMS-30PC Series 3½ Digit, LED Display Low-Power, Miniature Digital Panel Voltmeters 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 IDENTPIIFNI E#R1 RECOMMENDED PC BOARD FINISHED HOLE DIAMETER: ASU NI EDAM XX-X-CP03-SMD 0.042 ±0.003 (1.067 ±0.076) CALIBRATION POTENTIOMETER HOLE LOCATION FRONT VIEW PIN 1 +5V SUPPLY 1 12(–) INPUT LO DISPLAY TEST 2 11(+) INPUT HI 5V RETURN 3 10ANALOG COMMON 0.260 DP3 4 9+1.23V REFERENCE OUT (6.60) DP2 5 8REFERENCE OUT DP1 6 7REFERENCE IN 0.250 (6.35) DP1 DP2 DP3 0.125 (3.175) DIAMETER 0.92 2.17 (USE ONLY WHEN PC BOARD MOUNTING) (23.4) (55.1) 0.84 2.09 (21.3) (53.1) 0.560 0.040 (14.22) (1.02) 0.25 (6.4) TYP. 0.040 0.10 (1.02) (2.5) 1.80 0.15 (04..137) TYP. (01..00420) (45.7) T(3Y.7P.) TYP. 0.50 (12.7) BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT 0.187 #2-56 INSERT (4.75) 0.156 (3.96) DEEP BEZEL INSTALLATION PANEL FRONT VIEW 1.270 DMS-BZL1 and DMS-BZL2 (32.26) ASU NI EDAM GASKET * 2.55 (64.77) BEZEL * Sealing gasket is supplied with the DMS-BZL2 and DMS-BZL4 0.116 INTERNAL CORNER RADII: (2.95) RETAINING CLIP INSTALLATION 0.032 (0.81) MAX. 1.07 DMS-BZL1 & BZL2 0.878 (27.18) PANEL CUTOUT (22.30) PANEL 2.118 (53.80) 2.35 (59.69) 0.093 (2.362) DIAMETER (4 REQUIRED) (02..04946) ASU NI EDAM ® This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED 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. Specifi cations are subject to change without notice. © 2015 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DMS_30PC.G01 Page 6 of 6