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DMS-40PC Series
Actual Size
Digit, Display Precision, Miniature Digital Panel Voltmeters
Features
Precision, autozeroing, factorycalibrated converter Scientific-grade accuracy, counts Miniature size: 2.17" 0.92" 0.56" 55mm 23mm 14mm Large (0.52"/13.2mm) display Choice red, green yellow colors High-intensity low-power LED's optional Single supply (175mW lowpower models) Epoxy-encapsulated, 12-pin with built-in color filter bezel differential input voltage ranges DISPLAY HOLD TEST functions Optional data outputs interface +50°C temperature range
DMS-40PC Series, Digit, Display, Miniature DPM's fully self-contained, component-like, plug-in meters that provide scientific-grade accuracy (typically counts ±0.005% full scale) outstanding reliability very affordable price. Within miniature (2.17" 0.92" 0.56"), epoxy-encapsulated package, each meter contains precision reference circuit; high-resolution, autozeroing, factorycalibrated converter; large (0.52"/13.2mm), easy-to-read, display. LED's available red, yellow green colors. LED's also offered high-intensity low-power versions. versatile design DMS-40PC Series assures trouble-free installation long-term operation. Differential input voltage ranges include ±2V, ±20V ±200V. Input impedance minimum 800k. Non-inverting inputs overvoltage protected ±250V, CMRR typically 86dB 60Hz). DMS-40PC's epoxy-encapsulated package integral bezel color filter. moisture vibration-proof package extremely rugged well suited harsh environments extended temperatures. Devices fully specified +50°C operation. models operate from single supply typically consume 500mW. Lowpower models, whose display just bright standard models, typically consume 175mW. DISPLAY TEST HOLD functions standard each meter, complete outputs optional sending data CPU's remote displays.
SUPPLY DISPLAY TEST DC/DC CONVERTER
INPUT 0.01µF
909k
INPUT ANALOG COMMON
RETURN
CONVERTER 2.5V REF.
DATA
REFERENCE IN/OUT
DISPLAY HOLD
used (-1) models. 101k ±20V (-2) models 9.2k ±200V (-3) models.
Figure DMS-40PC Series Simplified Schematic
DATEL, Inc., Mansfield, 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email: sales@datel.com Internet: www.datel.com
DMS-40PC
Performance/Functional Specifications
Typical +25°C supply voltage using single-ended input circuit, unless otherwise noted. Analog Inputs Full Scale Input Range: DMS-40PC-1 DMS-40PC-2 DMS-40PC-3 Input Impedance: DMS-40PC-1 DMS-40PC-2, Overvoltage Protection Common Mode Voltage Range CMRR 60Hz) Control Inputs Decimal Point Placement (Pins 4-6, Display Test (Pin Display Hold (Pin Outputs Logic levels LSTTL load max.): Logic Logic Performance Sampling Rate Accuracy minute warm-up): DMS-40PC-1 (VIN +1.9V) DMS-40PC-2 (VIN +19V) DMS-40PC-3 (VIN +190V) Zero Reading (VIN Volts) Temperature Drift +50°C): DMS-40PC-1 DMS-40PC-2, Power Supply Requirements Supply Voltage Supply Current: Standard Models Low-Power Models Display Display Type Size Polarity Indication Overrange Indication Physical/Environmental Operating Temperature Storage Temperature Humidity (Non-condensing) Case Material Weight -+50 Digit LED, 0.52"/13.2mm high Autopolarity ("-" negative VIN) "-0000" (flashing) negative "0000" (flashing) positive +4.75 -+5.00 +100 +5.25 +140 Volts 0001" -2.5 samples second "0000" ±0.4 ±0.4 "0001" Counts Counts Counts +2.4 -+0.4 -+0.8 Volts Volts activate activate segments hold last reading Min. -100 -Typ. ±200 1000 Max. -±250 -Units Volts Volts Volts Volts Volts Output Models: outputs only available standard meters. DMS-40PC-1-RS-BCD input range DMS-40PC-2-RS-BCD ±20V input range DMS-40PC-3-RS-BCD ±200V input range DMS-40PC-1-RL-BCD input range DMS-40PC-2-RL-BCD ±20V input range DMS-40PC-3-RL-BCD ±200V input range Accessories: DMS-30-CP DMS-BZL1 DMS-BZL2 DMS-EB Panel cutout punch DMS-40 bezel assembly DMS-40 bezel assembly with sealing gasket Application/evaluation board with standard MOLEX connector, decimal point solder pads attenuation resistor pads.
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Ordering Information
DMS-40PC
Input Range: ±20V ±200V Color: Standard Green High-Intensity Low-Power Standard Standard Yellow
panel-mount retaining clip supplied with each model.
Technical Notes
±1.5 Cnts/°C Cnts/°C
ANALOG COMMON (Pin 10): This internal, low-noise ground DMS-40PC. internally connected RETURN). connect either your system ground this will create ground loop possibly result erroneous readings. REFERENCE INPUT/OUTPUT (Pin This accesses meter's internal reference used during factory calibration procedure. should left open most common applications. used certain "ratiometric" applications which desirable meter's reference track external reference. Note DATEL Panel Meter Catalog more details. DISPLAY TEST (Pin Connecting ground (pin RETURN) will activate segments, display will read "-18888" regardless actual applied input. reduce selfheating, display should left "test" mode more than seconds. This should left open unused. DISPLAY HOLD (Pin normal operation, this should left open. hold meter's last reading display continuously, ground (pin RETURN). Decimal Point Placement: location decimal point user-selectable, decimal point control pins (DP1-DP4) active functions. Select appropriate decimal point tying RETURN). Unused decimal point location pins should left open.
Polycarbonate 0.75 ounces grams)
Applies transient continuous overvoltages applied INPUT (pin with INPUT (pin properly connected. overvoltage protected (see Figure Voltages applied should exceed supply voltage. Technical Notes. outputs optional must specified part number. Ordering Information. Includes high-intensity BCD-output models.
DMS-40PC
Hard wiring preferable, however, exercise dynamic control over location decimal point employing drive circuits that capable sinking minimum 20mA voltages less than +0.4 Volts. Gain Adjust: There gain-adjust potentiometer back each meter. approximately ±150 counts adjustment range. Since these meters essentially have zero/offset errors, gain adjustment effectively overall accuracy adjustment. Though they performed point (except zero), accuracy adjustments most effective when performed with higher level input signals. Soldering Methods: models DMS-40PC Series easily withstand most common wave soldering operations. recommend, however, that evaluate effects your particular soldering techniques have meter's plastic case high-precision electrical performance. recommend water-soluble solders thorough cleaning procedures. Suggested Mating Connectors: Panel mounted: Connector housing Terminal type Crimping tool Wire size Insulation diameter Stripping length Board mounted: Socket DATEL 39-2079400 DATEL 39-2099090 DATEL 39-2099000 0.062" (1.57mm) maximum 0.100 0.125" (2.54 3.17mm) DATEL 39-2359625
DMS-40PC's simplified schematic, shown Figure very useful when debugging malfunctioning circuit, especially user some knowledge operational amplifiers amps). meter's high-impedance input consists powered from ±5Vdc power supply (the internally generated). Figure shows that input signals applied INPUT INPUT must kept within power-supply rails. Also note that only current-limiting 909k series resistor. High input voltages that have common ground connection with RETURN) should only applied ((+) INPUT never these high-voltage cases, should always tied RETURN). simplified schematic's more noteworthy features that shows some DMS-40PC internal voltage values also that meter's zero-volt reference point regardless type power signal source used. This important point keep mind when using digital multimeters perform system-level measurements. multimeter's negative lead (usually black one) must always connected RETURN). This only accurate readings made, particularly meter configured differential input concerns arise regarding common-mode voltages.
Applications
DMS-40PC Series meters high-precision versatile devices that used many applications requiring 19,999 count digital display. application circuits chosen this section ones that have historically received many inquiries. Every attempt been made ensure technical accuracy, following circuits have been prototyped tested ensure functionality. Please keep mind, however, that real-world applications seldom straightforward approaches presented here. inputs applied DMS-40PC meters must steady, values, otherwise input itself cause display instabilities. their digit resolution, DMS-40PC meters must wired with greater care than their digit counterparts. Correct power-supply input-signal wiring absolute must! helps eliminate groundloop induced errors that show unstable display readings. When input signal, assumed exactly zero volts, (0.001V) ground-loop induced offset, displayed "0010" input-range meter! DATEL's Digital Panel Meter Catalog contains application note describing power supply wiring ground loop avoidance techniques.
Single-Ended Input Configurations: DMS-40PC measure single-ended signals with either positive negative polarities. True single-ended inputs always have their terminals same potential DMS-40PC's RETURN (pin Single-ended inputs usually derived from power supplies that have common ground with meter's supply. Figure shows recommended connections used with this type input. INPUT shown directly tied ground. This connection ground must separate wire pc-board trace originating VIN's negative terminal. This hook-up will normally eliminate display instabilities errors caused ground-loop currents which occur INPUT tied ground near,
DMS-40PC-1-GS
DATEL UPA-5/500
Converter
Figure Single-Ended Input Configuration
DMS-40PC
Applications
Differential Input Configurations: Differential inputs also measured with DMS-40PC meters shown circuit Figure Differential inputs must also originate from power supplies that have common ground with meter's RETURN (pin However, differential inputs usually have both terminals above and/or below RETURN. Figure though necessarily typical real-world application, does serve purpose illustrating concept differential signal. voltages developed across equal each other measure approximately +1.6666Vdc power source. More importantly, while signal across single-ended, both ends well above ground described here being differential. Please note that while DMS-40PC measure voltages across either cannot measure +1.6666 volts across voltage lower approximately 3.333V this exceeds common mode voltage limit ±2V.
which calibration drift desirable. When using other, higherpower, DMS-40PC models combination with three-terminal regulators, sure consult regulator manufacturer's data sheet ensure device being utilized safely correctly.
LM2931T-5 18Vdc 22µF
DMS-40PC-2-RL
Figure 4.5-18V Power Supply Monitor
DMS-40PC-1-GS
DATEL UPA-5/500
Floating Signal Source Measurements: floating input signal that, before applied DMS-40PC's inputs, galvanic connection (direct current path) meter meter's power supply. circuit shown Figure illustrates necessary connections measuring floating inputs. 1.5V battery represents true floating input signal since initially connection whatsoever common with meter. Real-world floating inputs typically originate from power supplies which transformer isolated from DMS-40PC's supply. connection ((-) INPUT (ANALOG COMMON) required order provide bias return meter's input amplifier. This because neither tied reference voltage inside DMS-40PC (see Figure These connections made internally order give meter ability make differential measurements described previous section.
Converter
Figure Differential Input Configuration
Power Supply Monitoring: most widely used digital panel voltmeter applications monitoring output voltage system power supply often same supply that also powers meter. low-power, DMS-40PC-2-RL, with excellent 0.001Vdc resolution, configured monitor power supplies with outputs range 4.5-18Vdc. circuit Figure uses low-drop-out, three-terminal regulator (LM-2931T-5, T0-220 package, available from National Semiconductor) provide regulated power meter. LM-2931 chosen because following on-chip protection features: reverse polarity, short circuit thermal runaway. DMS-40PC-3-RL monitor voltages ±200Vdc, provided separate power source used since many three-terminal regulators cannot operate with supply voltages greater than 24V. Red, low-power models, with their very self-heating, recommended applications
COMM
DMS-40PC-1-GS
1.5V CELL
DATEL UPA-5/500
Converter
Figure Floating Input Measurements
DMS-40PC
Applications
Engineering Scaling Input Attenuation: many applications, input signal must scaled, divided down, before being applied DMS-40PC. some situations, input signal exceeds full-scale range meter, other applications, direct one-to-one relation does exist between input voltage desired display reading. example second situation, assume input voltage 1.0Vdc required display reading "7500" when applied input meter. input divider circuit, constructed with series resistors with output-to-input ratio 0.75, will scale 1.0V signal down 0.75V. Engineering scaling input attenuation discussed Note DATEL Digital Panel Voltmeter Catalog. Compensating inputs which have zero offset also discussed. Outputs (DMS-40PC-X-RS -RL-BCD Models Only): Models with "-BCD" suffix have extra output pins, labeled through side), that provide following information: multiplexed serial data, digit drive, polarity indication. data present pins simultaneously drives meter's internal display. functions pins CMOS compatible, however, they only rated drive one, 74LS series, load. CMOS logic IC's, example 74HC 74HCT series devices, should used when more fan-out capability required. timing diagram Figure indicates, 100Hz optimum display scan rate when outputs used drive external displays. Faster scan rates, while permissible, necessary. Slower scanning, however, result noticeable "flickering" display. Common anode LED's, combined with 74LS247 seven-segment decoder,
simplest implementing external display. seventy-five one-hundred resistor each LS247 segment-drive output provides adequate display brightness. functions pins listed below: DATA (pins Four lines used (Binary Coded Decimal) data outputs, representing numbers Positive-logic convention high represents "1") used. DIGIT DRIVE pins These five outputs, when gated with STROBE, used direct DATA into external latches. DIGIT DRIVE outputs also connected directly bases transistors remote-display configurations. digits scanned right-to-left, i.e., (DIGIT DRIVE) (DIGIT DRIVE). BUSY (pin This status that goes high start analog-to-digital (A/D) conversion cycle remains high until conversion ends. STROBE (pin string five sequential, active-low, STROBE pulses output (after BUSY goes low) indicating conversion availability data. STROBE pulses occur only once conversion, times each second. STROBE used latch data pins into external latches. Either edge used since STROBE 5µsec wide) active only center corresponding DIGIT DRIVE DATA outputs. POLARITY (pin This pin, which also used inside DMS40PC drive negative-sign segment, indicates whether last input signal conversion positive (POLARITY high) negative (POLARITY low). POLARITY, unlike DATA, multiplexed. data latching purposes, POLARITY should sampled during STROBE pulse digit (most significant digit).
Approx. 8msec Approx. 2msec Approx. 2msec
DIGIT DRIVE (MSD)
DIGIT DRIVE DIGIT DRIVE
DIGIT DRIVE DIGIT DRIVE (LSD) BUSY Approx. 5µsec STROBE Data from Previous Conversion DATA LINES) Strobes Only Conversion
Figure Data Timing Diagram
DMS-40PC
Mechanical Specifications
DMS-40PC-X-XX FRONT VIEW 0.92 (23.4) 0.84 (21.3) 2.17 (55.1) 2.09 (53.1) 0.040 (1.02) (BCD MODELS ONLY) 1.60 (40.6) 1.80 (45.7) 0.040 (1.02)
MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: ±0.02 (±0.51) ±0.010 (±0.254) LEAD DIMENSIONS: 0.025 (0.635) 0.025 (0.635) NOMINAL RECOMMENDED BOARD FINISHED HOLE DIAMETER: 0.042 ±0.003 (1.067 ±0.076)
IDENTIFIER MADE INSIDE (BCD MODELS ONLY)
CALIBRATION POTENTIOMETER HOLE LOCATION
(LSD) DIGIT (MSD) DIGIT DIGIT DIGIT DIGIT POLARITY
0.290 (7.37)
SUPPLY DISPLAY TEST RETURN
0.325 (8.26)
0.125 (3.175) DIAMETER (USE ONLY WHEN BOARD MOUNTING)
0.040 (1.02) 0.17 (4.3) TYP. 0.50 (12.7)
0.10 (2.5) TYP.
OPTIONAL BEZEL (DMS-BZL1 DMS-BZL2)
#2-56 INSERT 0.156 (3.96) DEEP 0.187 (4.75)
BEZEL INSTALLATION
FRONT VIEW
1.270 (32.26)
2.55 (64.77)
RECOMMENDED DRILL PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.116 (2.95)
RETAINING CLIP INSTALLATION
1.07 (27.18)
PANEL CUTOUT
0.878 (22.30)
2.35 (59.69) 0.093 (2.362) DIAMETER REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY 0.096 (2.44)
9001
DATEL, Inc. Cabot Boulevard, Mansfield, 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: sales@datel.com Data sheet back: (508) 261-2857
DATEL DATEL DATEL DATEL
(UK) LTD. Tadley, England Tel: (01256)-880444 S.A.R.L. Montigny Bretonneux, France Tel: 01-34-60-01-01 GmbH Germany Tel: 89-544334-0 Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL makes representation that products circuits described herein, other technical information contained herein, will infringe upon existing future patent rights. descriptions contained herein imply granting licenses make, use, sell equipment constructed accordance therewith. Specifications subject change without notice. DATEL logo registered DATEL, Inc. trademark.
2.118 (53.80)
INSIDE (BCD MODELS ONLY)
INPUT INPUT ANALOG COMMON DISPLAY HOLD REFERENCE IN/OUT
(LSB) (MSB) STROBE BUSY
0.560 (14.22)
0.25 (6.4) TYP.
0.10 (2.5) TYP. 0.15 (3.7) TYP.
LENAP
LENAP
DS-0272C 1/98
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