OEM 1B

OEM 1B 

3½ Digit LCD Voltmeter Module 

## **PRODUCT DESCRIPTION** 

The OEM 1B uses the latest miniaturisation techniques to produce a very compact 3 ½ digit LCD voltmeter. It is designed to be a drop-in component in most medium and high volume applications, ranging from personal instrumentation and integral sensor indicators to measurement probes. The meter features 8mm digit height, 3 decimal points, auto-polarity, auto-zero, 200mV full scale reading and a very low current consumption. Connectiontothemoduleisviatwodualinlinerowsofpins. 

## **FEATURES** 

- 8mm (0.31") Digit Height 

- 200mV d.c. Full Scale Reading 

- 150 A @ 7.5 to 14V Operation 

- Auto-zero and Auto-polarity 

- • Selectable Decimal Points • Very Compact Design 

## **TYPICAL APPLICATIONS** 

- Personal Gas Monitoring 

- Medical Instruments 

## **ORDERING INFORMATION** 

Stock Number Standard Meter **OEM 1B** 

- Measurement Probes 

- Hand held instruments 

## **ELECTRICAL SPECIFICATIONS** 

|**Specification**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|
|Accuracy (overall error) *<br>~~ee~~|~~ee~~|0.1<br>~~ee~~|~~ee~~|%(±1 count)<br>~~ee~~|
|Linearity|||1<br>+|count|
|y<br>Sample rate<br>~~a~~|~~Ss~~|2.5<br>~~Ss~~|~~S(O~~|samples/sec<br>~~S(O~~|
|Operatingtemperature range<br>~~a~~|0<br>~~Ss~~|~~Ss~~|50<br>~~S(O~~<br>~~(~~|°C<br>~~S(O~~<br>~~(~~|
|Temperature stability||100||ppm/°C|
|Supplyvoltage(V+ to V-)<br>~~a~~|7.5<br>~~ee~~|9<br>~~es~~|14**<br>~~es~~|V d.c.<br>~~es~~|
|Supplycurrent<br>~~a~~|~~ee~~<br>~~eS~~|150<br>~~es~~|~~es~~<br>~~es~~|A<br>~~es~~<br>~~ee~~|
|Input leakage current (Vin = 0V)<br>~~a~~|~~ee~~<br>~~eS~~|1<br>~~es~~|10<br>~~es~~<br>~~es~~|pA<br>~~es~~<br>~~ee~~|



* To ensure maximum accuracy, re-calibrate periodically. 

** Operation of the meter beyond the maximum supply voltage rating may cause permanent damage to the meter. 

Unless otherwise noted, specifications apply at T =25°C, V supply =5Vd.c. (f clock =48kHz) and are tested with the module configured for floating input mode. 

## **SAFETY** 

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed 60Vdc. The user must ensure that the incorporation of the panel meter into the user’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and LaboratoryUse). 

|LaboratoryUse).|||||||
|---|---|---|---|---|---|---|
|LASCAR ELECTRONICS LTD.||LASCAR ELECTRONICS INC.||||LASCAR ELECTRONICS (HK) LTD.|
|MODULE HOUSE,<br>WHITEPARISH,<br>WILTSHIRE SP5 2SJ,<br>UK||4258 WEST 12th STREET,<br>ERIE,<br>PA 16505,<br>USA|||8th FLOOR,|8th FLOOR, CHINA AEROSPACE CENTRE,<br>143 HOI BUN ROAD,<br>KWUN TONG, KOWLOON,<br>HONG KONG|
|TEL: +44 (1794) 884567||TEL: +1 (814) 835 0621||||TEL: +852 2389 6502|
|FAX: +44 (1794) 884616<br>E-mail: sales@lascar.co.uk|FAX: +1 (814) 838 8141<br>E-mail: us-sales@lascarelectronics.com|||||FAX: +852 2389 6535<br>E- mail: saleshk@lascar.com.hk|
|**_Specifications liable to change without prior warning_**||**OEM 1B**|**Issue 5**|**06/2010**|**S.L.**|**Applies to OEM 1B/3**|



OEM 1B 

3½ Digit LCD Voltmeter Module 

## **DIMENSIONS** 

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All dimensions in mm (inches)<br>23.4 (0.92)<br>5.3 (0.21) 1.27 (0.05)<br>ee +0.2(0.01) aa le<br>CAL<br>17.8 (0.70)<br>o s + ae<br>5.5 (0.22) 5.0 2.54 (0.10)<br>(0.20)<br>FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATION (rear view)<br>V+<br>RHI Vref<br>CAL<br>COM wai Torrey<br>CAL<br>RLO<br>e S=-<br>INI<br>A/D XDP<br>+_ 1 8<br>ILO<br>ae ee<br>V- DP3 2 1<br>Specifications liable to change without prior warning OEM 1B Issue 5 06/2010 S.L. Applies to OEM 1B/3<br>Page 2 of 4<br>www.lascarelectronics.com No: 695 - Page 2 of 4<br>@LasaR§§<br>(0.53) (0.65) 0.4(0.02) 6.35 (0.25) (0.50)<br>13.4 16.4 + 12.7<br>5.5<br>(0.22)<br>**----- End of picture text -----**<br>


3½ Digit LCD Voltmeter Module 

## OEM 1B 

## **CIRCUIT DIAGRAM** 

## **PIN FUNCTIONS** 

1. V- Negativepowersupplytothemeter. 2. V+ Positivepowersupplytothemeter. 3. IHI Positivemeasuringinput. IHImustbenocloserthan1.6Vtoeitherthepositiveornegativesupply,whenusingthe internal100mVreference. 

4. ILO Negativemeasuringinput. ILOmustbenocloserthan1.6Vtoeitherthepositiveornegativesupply,whenusingthe internal100mVreference. 

5. COM GroundfortheanaloguesectionoftheA/Dconverter.Itisactivelyheldat3.05V(nom.)below V+andmustnotbeallowedtosinkexcessivecurrent(>100mA)by,for instance,connecting toahighervoltage. 

6. RLO Negativeinputforthereferencevoltage. 7. RHI Positiveinputforthereferencevoltage. 8. NC Donotconnect. 9. DP1 ConnecttoXDPtodisplayDP1(199.9). 10. DP2 ConnecttoXDPtodisplayDP2(19.99). 11. DP3 ConnecttoXDPtodisplayDP3(1.999). 12. XDP ConnecttoDP1,DP2orDP3todisplayrequireddecimalpoints. 

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Specifications liable to change without prior warning OEM 1B Issue 5 06/2010 S.L. Applies to OEM 1B/3<br>**----- End of picture text -----**<br>


3½ Digit LCD Voltmeter Module 

## OEM 1B 

## **SCALING** 

Two resistors Ra and Rb may be used to alter the full scale reading (FSR) of the meter - see table. The meter will have to be recalibrated by adjusting the calibration potentiometer ontherearofthemodule. 

||||**FSR**||**Ra**||**Rb**||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||||2V||910k||100k||||Ra||||||
||Voltage||20V||1M||10k|+||||||||IHI|
||Vin||200V||1M||1k||||||||||
||||2000V*||1M||100R|Vin or|I|in|||||Rb|OEM 1B|
||Iin<br>Current||200 A<br>2mA<br>20mA<br>200mA||0R<br>0R<br>0R<br>0R||1k<br>100R<br>10R<br>1R|-||||||||ILO|
|*Ensure that Ra is rated for high voltage use.||*Ensure that Ra is rated for high voltage use.|||||||||||||||



## **APPLICATIONS** 

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Do not connect more than one meter to the same power supply if the meters cannot use the same signal<br>ground. Takinganyinputbeyondthepowersupplyrailswilldamagethemeter.<br>V+ V+ V+<br>2 2 2<br>V+ V+ 510K V+<br>+ 3 IHI + 3 IHI 3<br>IHI<br>±200mV ±200mV<br>- 4 ILO - 4 ILO COM 5 14V max7V min SUPPLY 10K COM 5<br>VOLTAGE<br>56 COM 0V RLO 6 4 ILO RLO 6<br>RLO<br>V- 1.6Vmin. V- 510K V-<br>1 1 1<br>1d V- V- B V-<br>Measuring a floating voltage Split supply operation. Measuring a supply voltage.<br>source of 200mV full scale. (min. 7.5V, max. 14V).<br>V+<br>V+<br>2 IIN 100K 2<br>V+ 3 V+<br>3 IHI<br>+ IHI<br>SET 4<br>R - 5 COM 6R2 2K ZERO ILO<br>6 RLO 6 RLO<br>- 4 ILO 5 COM<br>R=0.2 V- V-<br>i IFSR ] 1 V- IOUT 1 V-<br>Measuring current. Measuring 4-20mA to read 0-999.<br>Supply MUST be isolated. Supply MUST be isolated.<br>**----- End of picture text -----**<br>


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

**OEM 1B Issue 5 06/2010 S.L. Applies to OEM 1B/3**