DPM 959B

3½ Digit LED Voltmeter 

## DPM 959B 

This compact voltmeter is ideally suited to applications where excellent readability under all lighting conditions is required. The meter is fitted with high efficiency LEDs which, together with the integral red filter, give a high contrast display with 19mm (0.75") digit height. The meter can be easily scaled by the user to indicate volts, amps or other engineering units and maybeusedinsingle-ended,differential,ratiometricorfloatinginputmodes. 

- **19mm (0.75“) Digit Height Programmable Decimal Points** 

- **Auto-zero** 

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

## **SCALING** 

Two resistors Ra and Rb may be fitted on the module in order to alter the full scale reading (F.S.R.) of the meter - see table. The meter will need re-calibration byadjustingthecalibrationpotentiometer. 

|**Required F.S.R.**<br>2V<br>Note|**Ra**<br>910k|**Rb**<br>100k|
|---|---|---|
|20V<br>Note|1M|10k|
|200V<br>Note|1M|1k|
|2kV<br>Note|1M|100R|
|200 A|LINK|1k|
|2mA|LINK|100R|
|20mA|LINK|10R|
|200mA|LINK|1R|



**NOTE** 

Ensurethatsolderlink10acrossRaisOPEN. 

## **SAFETY** 

|**Specification**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|
|Accuracy (overall error)*||0.1||%(±1 count)|
|Linearity|||±1|count|
|Sample rate||2.5||samples/sec|
|Operatingtemperature range|0||50|°C|
|Warm-uptime<br>tabilit||10||minute<br>m/°C|
|Temperature s<br>Sul<br>tability<br>voltae (V+ to V-)|4.75|150<br>5|5.25|ppm/°C<br>V|
|Supply<br>voltage (V+ to V-)|4.75|5|5.25|V|
|Supply<br>current||50|90|mA|
|Input leakage current (Vin = 0V)||1|10|pA|



* To ensure maximum accuracy, re-calibrate periodically. 

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 RequirementsforElectricalEquipmentforMeasuring,ControlandLaboratoryUse). 

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DIMENSIONS All dimensions in mm (inches) 76.0 (2.99) PanelMaximumcut-outpanel72 thicknessx 40 (2.833mmx 1.57)(0.12)<br>a<br>72.5 (2.85) +<br>i REAR<br>VIEW<br>1<br>16<br>a. 1.0 (0.04)<br>b. 2.0 (0.08)<br>_ va c. 6.5 (0.26)<br>d. 11.5 (0.45)<br>51.0 (2.01) e. 8.4 (0.33)* SCALING RESISTORS<br>o h aA b c ON TOP SIDE OF BOARD<br>61.5 (2.42) ON-BOARD SOLDER LINKS<br>51.0 (2.01) d e<br>Ø5.7 2.54 pin pitch<br>(0.22)<br>REARVIEW DE 2 7 3 10Rb<br>Ra<br>a FL — 1<br>11 1 16<br>POL<br>pF 71.5 (2.81) Ø3.0 ES= 12<br>(0.12) *typical depth of tallest component behind PCB,<br>this dimension is for guidance only.<br>Specifications liable to change without prior warning DPM 959B Issue 12 06/2010 S.L. Applies to DPM 959B/1<br>www.lascarelectronics.com<br>2.54 pin pitch<br>21.5<br>(1.73) (1.59) (0.94)<br>44.0 40.5 24.0<br>(1.54) (0.95) (0.96)<br>39.0 24.2 24.5 DP3 DP2 DP1<br>DP2 DP COM REF LO COM IN LO V NEG GND +SEG<br>DP3 DP1 REF HI NC IN HI TEST V+ POL<br>**----- End of picture text -----**<br>


LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. LASCAR ELECTRONICS (HK) LTD. MODULE HOUSE, 4258 WEST 12th STREET, 8th FLOOR, CHINA AEROSPACE CENTRE, WHITEPARISH, ERIE, 143 HOI BUN ROAD, WILTSHIRE SP5 2SJ, PA 16505, KWUN TONG, KOWLOON, UK USA HONG KONG TEL: +44 (1794) 884567 TEL: +1 (814) 835 0621 TEL: +852 2389 6502 FAX: +44 (1794) 884616 FAX: +1 (814) 838 8141 FAX: +852 2389 6535 E-mail: sales@lascar.co.uk E-mail: us-sales@lascarelectronics.com E- mail: saleshk@lascar.com.hk 

## **PIN FUNCTIONS** 

1. +SEG Usetoindicatepositivepolarity-see"VARIOUSOPERATINGMODES"fordetails. 2. POL Tocompletelydisablethenegativepolaritysign,cutsolderlinkPOL. 

3. GND Negativepowersupplyconnection(0V). 

4. V+ Positivepowersupplyconnection(+5V). 

5. VNEG Outputfromnegativerailgenerator(-5Vnom).ThisisaninversionofV+. 

6. TEST WhentakentoV+allsegments,exceptdecimalpoints,shouldlighti.e. "1888". 

7. INLO Negativemeasuringinput. Analogueinputsmustbenocloserthan1.5Vtothepositiveornegativesupply. 8. IN HI Positive measuring input. The negative supply is generated internally and mirrors the positive supply voltage. 9. COM GroundforanaloguesectionoftheA/Dconverter,itisactivelyheldat3.05VbelowV+andmustnotbeallowedtosink excessivecurrent(>100 A)by,forinstance,connectingtoahighervoltage. 

10. NC Donotconnect. 

11. REFLO Negativeinputforreferencevoltage. (ConnectedviaLink3toCOM.) 

12. REFHI Positiveinputforreferencevoltage. (ConnectedviaLink1tointernalreference.) 

13. DPCOM ConnecttoPins14,15or16toilluminatetherequireddecimalpoint,alternativelyusetheon-boardsolderlinksDP1,2or3. 14. DP1 ConnecttoPin13todisplayDP1(199.9). 

15. DP2 ConnecttoPin13todisplayDP2(19.99). 

16. DP3 ConnecttoPin13todisplayDP3(1.999). 

## **SOLDER LINKS** 

1. Normallyclosed. Openthislinktodisabletheinternalreference.ThenapplyanexternalreferencetoREFHI(pin12). 2. Normallyopen. ClosethislinktoconnectINLO(pin7)toCOM(pin9). 3. Normallyclosed. OpenthislinktodisconnectCOM(pin9)fromREFLO(pin11). 7. Normallyopen. ClosethislinkconnectINLO(pin7)toGND(pin3). 10. Normallyclosed. OpenthislinkwhenfittingscalingresistorRa. DP1-2-3. Normallyopen. CloseoneoftheselinkstodisplaydecimalpointsDP1(199.9),DP2(19.99)orDP3(1.999) respectively. POL. Normallyclosed. Openthislinktodisablethepolaritysign. SeePinFunctions1and2above. 

## **VARIOUS OPERATING MODES** 

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ON-BOARD SOLDER LINKS: In order to quickly and easily change operating<br>modes for different applications the meter has several on-board solder links. Normally Normally<br>They are designed to be easily opened (cut) or shorted (soldered). Do not connect SHORTED OPEN<br>Cut to Solder to<br>more than one meter to the same power supply if the meters cannot use the same OPEN SHORT<br>signal ground. Taking any input beyond the power supply rails will damage the<br>meter.<br>+4.75 to +5.25V +4.75 to +5.25V +4.75 to +5.25V<br>4 IIN 4 4<br>V+ 8 V+ V+<br>8 220k IN HI + 8 IN HI<br>+ IN HI Input<br>INPUTVOLTAGE - 7 IN LO 6R2 5k Set 7 IN LO Voltage - 7 IN LO<br>Zero<br>9<br>COM<br>GND GND GND<br>3 IOUT 3 3<br>al 0V M L) 0V A, 0V<br>Check solder link 2 is OPEN. Check solder link 2 is OPEN. Check solder link 2 is SHORTED.<br>Operation with input referenced to panel Measuring 4-20mA to read 0-999 Operation with input floating<br>meter supply (Single ended mode). (supply MUST be isolated). with respect to power supply.<br>Preferably link IN LO to GND at signal<br>source (to reduce loop noise), otherwise<br>make link 7.<br>+4.75 to +5.25V<br>+SEG<br>(Pin 4)<br>+4.75 to +5.25V +4.75 to +5.25V (Pin 1)<br>4 4<br>8 IN HIV+ + 8 IN HIV+ POL 10K BC307 BC307<br>R V1 - 7 IN LO (Pin 2)<br>7<br>IN LO 12 10K<br>+ REF HI<br>R= I [0.2] FSR V2 - 11 REF LO 1K0 1K5<br>GND GND 0V<br>3 0V 3 0V (Pin 3)<br>Check solder links 2 & 3 are SHORTED. Check solder links 1 & 3 are OPEN.<br>f{] &] “he<br>Measuring current. Measuring the ratio of two voltages. The above circuit can be used to<br>Supply MUST be isolated. Reading = 1000 V1/V2 indicate both positive and negative<br>50mV< V2<200mV polarity, by illuminating either the<br>V1<2V2. + or - segment on the meter.<br>**----- End of picture text -----**<br>


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

**DPM 959B Issue 12 06/2010 S.L. Applies to DPM 959B/1**