DPM340

## DPM 340 

## Miniature 3½ Digit LED Voltmeter 

A very compact low-cost LED module ideally suited for applications where a bright display under all conditions is required. The DPM 340 is fitted with high efficiency, very low current LEDs and is housed in a carrier with integral snap-in bezel. The small size and low cost of the unitmakesitverysuitableforhighvolumeOEMapplications. 

- **8mm (0.31") Digit Height** 

- **Programmable Decimal Points** 

- **Auto-zero, Auto-polarity** 

- **200mV d.c. Full Scale Reading (F.S.R.)** 

- **Very Low Current Consumption** 

## **SCALING** 

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Two resistors Ra and Rb may be used in order to<br>alter the full scale reading (F.S.R.) of the meter - see<br>table.<br>+ The meter will need re-<br>Stock Number<br>calibration by adjusting<br>Ra t h e o n - b o a r d Standard Meter DPM 340<br>INPUT Rb IN HI potentiometer. Specification Min. Typ. Max. Unit<br>- IN LO Accuracy (overall error) * 0.05 0.1 % (±1 count)<br>Linearity ±1 count<br>Sample rate 3 samples/sec<br>Required F.S.R. Ra Rb Operating temperature range 0 50 °C<br>2V 910k 100k Temperature stability 150 ppm/°C<br>20V 1M 10k Supply voltage 4.75 5 5.25 V<br>200V 1M 1k Supply current** 50 65 mA<br>2kV 1M 100R Input leakage current (Vin = 0V) 1 10 pA<br>200 A LINK 1k<br>2mA LINK 100R * To ensure maximum accuracy, re-calibrate periodically.<br>20mA LINK 10R ** Depends on reading.<br>200mA LINK 1R<br>=, Tr<br>DIMENSIONS All dimensions in mm (inches)<br>40.0 (1.57)<br>27.3 (1.07) a b c d a. 2.00 (0.08) Panel cut-out<br>1 oe b. 6.00 (0.24) 38.0 x 18.0 (1.50 x 0.71)<br>c. 1.60 (0.06) max<br>d. 6.00 (0.24) Panel1.0 tothickness2.5 (0.04 to 0.1)<br>e. 2.54 (0.10)<br>f. 0.50 (0.02)<br>g. 6.00 (0.23) ON BOARD SOLDER LINKS<br>h. 2.00 (0.08)<br>[j t<br>e f g<br>h<br>11 1 11 1<br>37.5 (1.48)<br>LJ<br>PANEL FITTING<br>Locate the meter by passing it through the front of the panel cut-out and gently push until the rear of the bezel is flush with the panel (DO NOT<br>PUSH ON THE DISPLAY AREA). The snap-in lugs will now automatically hold the meter firmly in position.<br>COM LO HI<br>DP DP1 DP2 DP3 +5V IN COM IN RHI RLO 0V<br>Lref DP1 DP2 DP3<br>(0.79) (0.50)<br>20.0 12.7<br>(0.69)<br>17.5<br>**----- End of picture text -----**<br>


http://www.lascarelectronics.com 

**LASCAR ELECTRONICS INC. LASCAR ELECTRONICS (HK) LTD. 4258 WEST 12th STREET, 8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN ERIE, PA 16505 USA ROAD, KWUN TONG, KOWLOON, HONG KONG FAX: +1 (814) 838 8141 TEL: +852 2389 6502 FAX: +852 2389 6535 E-mail: us-sales@lascarelectronics.com E-mail: saleshk@lascar.com.hk** 

**LASCAR ELECTRONICS LTD. MODULE HOUSE, WHITEPARISH, WILTSHIRE SP5 2SJ UK** 

**TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616 TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141 E-MAIL: sales@lascar.co.uk E-mail: us-sales@lascarelectronics.com** 

## **PIN FUNCTIONS** 

1. 0V Negativepowersupplyinput. 2. RLO Negativeinputforreferencevoltage. 3. RHI Positiveinputforreferencevoltage. 4. INHI Positivemeasuringinput. 5. COM Thegroundfortheanaloguesectionoftheconverter,heldactivelyat3.05V(nom)below+5V. Thispinisforuseonlywhenthemodule isusedwithafullyfloatingsupply. **Itshouldonnoaccountbeconnectedtoanyotherterminationsorcircuitryexceptasspecifiedintherelevantoperatingmodes.** 

6. INLO Negativemeasuringinput. 7. +5V Positivepowersupplyinput. 

8. DP3 1.999 

9. DP2 19.99 ConnectrequiredDPpintoDPCOM. 

10. DP1 199.9 

11. DPCOM Connecttorequireddecimalpoint(DP1,DP2orDP3)toilluminate. ThispinisnotfittedasstandardtotheDPM340. 

Note: Anegativesupplyisgeneratedinternallyandmirrorsthepositivesupply.Forexample:ifV+is+5V,thentheinternally generatedV-is-5V. Whenmeasuringwiththeinputreferencedtothesamesupplyrailasthatofthepanelmeter,thenthelimitationson theinputrangeare(V-+1.5V)to(V+-1.5V). 

## **SAFETY** 

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed 60Vdc. If voltages to the measuring inputs do exceed 60Vdc, then fit scaling resistors externally to the module. The user must ensure that the incorporation of the DPM into the user’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring,ControlandLaboratoryUse). 

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VARIOUS OPERATING MODES<br>+5V +5V +5V<br>7 IIN 7 7<br>+5V 4 +5V +5V<br>INPUT + 4 IN HI IN HI RLO 2 INPUT + 4 IN HI<br>VOLTAGE - 6 IN LO RLO 2 6R2 220k5k SET 6 IN LOCOM 5 VOLTAGE - 6 IN LOCOMRLO<br>COM 5 ZERO 5 COM 5 COM<br>0V 0V 0V<br>1 IOUT 1 1<br>Hb 0V iP 0V 0V<br>Operation with input referenced to panel Measuring 4-20mA to read 0-999. Operation with input floating with respect to<br>meter supply (single ended). power supply.<br>+5V +5V<br>7 7 22k<br>+5V +5V<br>4<br>R 6 ININ HI LOCOMRLO 25 INPUTVOLTAGE +- 46 ININ HI LO RRHILO 32 180k15k 8069<br>5 COM 5 5 2k<br>COM COM<br>R= I [0.2] FSR 0V 0V<br>1 1<br>ep 0V =U 0V<br>Measuring current. Adding an external reference.<br>1. Cut Link Lref<br>2. Fit components as indicated above.<br>**----- End of picture text -----**<br>


_**Specifications liable to change without prior warning**_ 

**06/2010** 

**Applies to DPM 340/** 

**S.L.** 

**DPM 340 Issue 8**