DATEL DMS-30PC Series 3½ Digit LED Display Low-Power Miniature Digital Panel Voltmeters handbook
Contents
1. E 1 02 0 50 12 7 OPTIONAL BEZEL DMS BZL1 and DMS BZL2 0 187 pt 2 56 INSERT 4 75 ia BEZEL INSTALLATION FRONT VIEW 0 156 3 96 DEEP Lez 2 55 64 77 y RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS 0 116 INTERNAL CORNER RADII 2 95 6 PA 0 032 0 81 MAX a I RETAINING CLIP INSTALLATION eis PANEL CUTOUT tee 30 LS T v ma 2 118 53 80 _____ 4 rY B e Ce 2 35 59 69 gt a 0 096 0 093 2 362 DIAMETER 4 REQUIRED 2 44 ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY l i ISO 9001 1D at INNOVATION and EXCELLENCE REGISTERED DS 0258D 1 98 DATEL Inc 11 Cabot Boulevard Mansfield MA 02048 1151 DATEL UK LTD Tadley England Tel 01256 880444 Tel 508 339 3000 800 233 2765 Fax 508 339 6356 DATEL S A R L Montigny Le Bretonneux France Tel 01 34 60 01 01 Internet www datel com Email sales datel com DATEL GmbH M nchen Germany Tel 89 544334 0 Data sheet fax back 508 261 2857 DATEL KK Tokyo Japan Tel 3 3779 1031 Osaka Tel 6 354 2025 DATEL 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 The DATEL logo is a registered DATEL Inc trademark2. zero accuracy adjustments are most effective when performed with higher level input signals The circuit shown in Figure 10 provides 10 range of adjustment 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 water soluble solders and thorough cleaning procedures Suggested Mating Connectors Panel mounted Connector housing DATEL P N 39 2079400 Terminal type DATEL P N 39 2099090 Crimping tool DATEL P N 39 2099000 Wire size 22 to 26 AWG Insulation diameter 0 062 1 57mm maximum Stripping length 0 100 to 0 125 2 54 to 3 17mm Board mounted Socket DATEL P N 39 2359625 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 Figu
3. e Tel 508 339 3000 800 233 2765 Fax 508 339 6356 e Email sales datel com e Internet www datel com DMS 30PC 3 DIGIT LED DISPLAY DIGITAL PANEL VOLTMETERS Performance Functional Specifications Typical at Ta 25 C and supply voltage 5V using the single ended input circuit unless otherwise noted Analog Inputs Min Typ Max Units Full Scale Input Range DMS 30PC 0 200 mV DMS 30PC 1 2 Volts DMS 30PC 2 20 Volts DMS 30PC 3 200 Volts Input Impedance DMS 30PC 0 1 100 1000 MQ DMS 30PC 2 3 0 8 1 MQ Overvoltage Protection 250 Volts Common Mode Voltage Range 2 Volts CMRR dc to 60Hz 86 dB Decimal Point Placement Pins 4 6 Tie to pin 3 to activate Control Inputs Display Test Pin 2 Sampling Rate Tie to 5V to activate all segments 2 5 samples per second Performance Accuracy 3 minute warm up DMS 30PC 0 Vin 0 19V 1 2 Counts DMS 30PC 1 Vin 1 9V 1 2 Counts DMS 30PC 2 Vin 19V 2 3 Counts DMS 30PC 3 Vin 190V 2 3 Counts Zero Reading Vin 0 Volts 001 000 001 Temperature Drift 0 to 60 C 0 15 0 3 Cnts C 1 23V Reference Output Pin 9 1 20 1 23 1 25 Volts Power Supply Requirements Display Type and Size Supply Voltage 4 75 5 00 5 25 Volts Supply Current Standard Models Blue display 400 550 mA All others 150 225 mA Low Power Models Red display 12 17 mA Green
4. 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 applica tion specific instrument 1 5V SUPPLY o 2 DISPLAY TEST O gt 3 5V RETURN Rt 11 AA A INPUT HI 12 INPUT LO 1 R2 0 01 pF 10 ANALOG COMMON A D VERTER DATA Ji 1 23V REFERENCE OUT REFERENCE OUT 47 5V 7 REFERENCE IN 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 Simplified Schematic DATEL Inc Mansfield MA 02048 USA
5. 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 DMS 30PC IN HI OUT VOLTAGE a ae CALIBRATOR COM INLO 10 8 17 9 ANA COMM NC Z d REF IN 1 23V REF i i I I 8 45k 1 Connections 7 for 2V 20V I pad 1k and 200V models l l 10to 20 Turns l t acl Gans t Warne Connections ik 8 45k 1 for 200mV 10 to 20 Turns models Figure 10 External Gain Adjustment DMS 30PC 3 DIGIT LED DISPLAY DIGITAL PANEL VOLTMETERS Mechanical Specifications MECHANICAL DIMENSIONS Inches mm TOLERANCES 2 PL DEC 0 02 0 51 Bing 3 PL DEC 0 010 0 254 IDENTIFIER gt V XX x Od0e SWd LEAD DIMENSIONS 0 025 0 635 x 0 025 0 635 NOMINAL RECOMMENDED PC BOARD FINISHED HOLE DIAMETER Noma Twa a 0 042 0 003 1 067 0 076 CALIBRATION POTENTIOMETER HOLE LOCATION FRONT VIEW PIN 1 5V SUPPLY 1 INPUT LO DISPLAY TEST 2 INPUT HI 5V RETURN 3 ANALOG COMMON DP3 4 1 23V REFERENCE OUT DP2 5 REFERENCE OUT DP1 6 REFERENCE IN DP1 DP2 DP3 0 125 3 175 DIAMETER 0 92 a Leia 2 17 USE ONLY WHEN PC BOARD MOUNTING 23 4 55 1 2 09 D 53 1 0 040 1 02 02 0 10 gt a ay _ a La een TYP j
6. 0 0 DMS30PC O O Actual Size D OATEL INNOVATION and EXCELLENCE DMS 30PC Series 3 2 Digit LED Display Low Power Miniature Digital Panel Voltmeters Features e Large 0 56 14 2mm LED display e 7 LED colors e Low power LED s optional e Epoxy encapsulated 12 pin DIP with built in color filter and bezel e Miniature size 2 17 x 0 92 x 0 56 55mm x 23mm x 14mm e Panel or pc board mountable e 4 differential input voltage ranges e Auto calibration 1 count accuracy e User selectable decimal point placement e Single 5V supply 60mW for low power models e 0 to 60 C temperature range e Numerous plug on application boards e 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 and 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 ina single epoxy encapsulated 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
7. 9312Z 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 DMS 30PC 2 RL 45 18Vde Figure 8 4 5 18V Power Supply Monitor Digital Ammeter Digital ammeters are finding ever increasing External Gain Adjustment Connect REFERENCE OUT protection features reverse polarity short circuit 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 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 DMS 30PC 0 YS IC rir I nf Loaf Lf 0 150V 0 19 Load Rshunt 8 39 Figure 9 Basic DC Ammeter Circuit pin 8 to REFERENCE IN pin 7 for normal factory calibrated operation Use the 1 23V REFERENCE OUT
8. GIT LED DISPLAY DIGITAL PANEL VOLTMETERS DMS 30PC 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 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 Applied 0 Voltage Load Current DMS 30PC X RL 0 05V max 0 7mA max DMS 30PC X BS 0 3V max 18mA max All Others 0 4V max 6mA max The driving gates must be able to sink this much current lo with a logic 0 output 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
9. P 5V RET DATEL 120 VAC ypa 5 500 AC to DC Converter 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 pin 10 ANALOG COMMON or pin 3 6V 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 m 5 rir iE o l Lot Lf pt 1 3 6 5V SUP 5V RET DPi DATEL 120 VAC upa s 500 REF IN AC to DC Converter Figure 5 Floating Input Measurements DMS 30PC 1 8 IN HI REF OUT F i r asv L ANA COMM i a a 12 o mm 7 ONLO REF IN 1 3 6 5V SUP 5V RET DPI AC to DC Converter DATEL 120 VAC ypa s 500 Figure 6 Floating Input Measurements Alternate Configuration 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 ca
10. i 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 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 approxi mately 2V This output should be buffered if used to drive external loads since sourcing more than 15pA from pin 9 can affect both the initial accuracy and temperature drift of the meter 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 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 3 DI
11. ll not flow in the wiring that connects Va to INPUT LO pin 12 Ground loop currents can cause unstable readings DMS 30PC 1 8 REF OUT 7 GNLO REFIN DATEL 120VAC UPA 5 500 AC to DC Converter Figure 2 Single Ended Input Configuration DMS 30PC 3 DIGIT LED DISPLAY DIGITAL PANEL VOLTMETERS 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 ti RI REFOUT 8 R3 1 3 1k 5V SUP 5V RET DATEL 120 VAC ypa s 500 AC to DC Converter Figure 3 Differential Input Configuration 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 50kQ lt R1 R2 lt 10MQ R2 R1 R2 R1 i DMS 30PC 1 eo CO i x Vin Reading I I 1 3 5V SU
12. n be calculated using the following equation Rshunt R1 Vesr For Where Vrs Full scale reading in Volts lfs Relative full scale current in Amps 3 DIGIT LED DISPLAY DIGITAL PANEL VOLTMETERS DMS 30PC 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 Ves 1 000 Volts Renn 1 000V 0 020 0 004 A Renn 1 000V 0 016A 62 5 Ohms To calibrate the circuit of Figure 7 perform the following 1 With 4mA applied adjust the 50kQ 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 Rstun accordingly ii DMS 30PC 1 INHI 8 REF OUT 10 ANA COMM 7 REF IN 5V SUP 5V RET DATEL 120 VAC ypa 5 500 AC to DC Converter Figure 7 4 to 20mA Current Loop Operation 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 LM 2
13. or orange display 60 100 mA BIGIEN 3 Digit LED 0 56 14 2mm high Polarity Indication Autopolarity for negative Vin Overrange Indication 1___ for negative Vin 1___ for positive Vin Physical Environmental Operating Temperature Blue display models 0 50 C All other models 0 60 C Storage Temperature 40 75 C Humidity Non condensing 0 95 Case Material Polycarbonate Weight 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 Ordering Information DMS 30PC 1 RS LED Color Input Range AS Standard Amber 0 200mV BS Standard Blue 1 2V GS Standard Green 2 20V 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 3 200V Available on the following models only GS Standard Green RS Standard Red RL Low Power Red Accessories DMS 30 CP Panel cutout punch DMS BZL1 DMS 30 bezel assembly DMS BZL2 DMS 30 bezel assembly with sealing gasket RN DMS Gain offset potentiometer kit for DMS EB DMS EB AC DC and DMS EB DC DC Add On Application Boards DMS EB Mult
14. re 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 909kQ 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 wi
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