DPM 750S-BL

DPM 750S-BL 

3½ Digit Backlit LCD Voltmeter Module 

The DPM 750S-BL features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user selectable. The meter features a negative rail generator which enables the meter to measure a signal referenced to its own power supply GND. A low drift bandgap reference circuit ensures accurate readings over a wide temperature range. LED backlighting ensures excellent readability under low light conditions. The module's low cost means it will suit high and low volume applications. This module is supplied with a plastic mounting bezel. A waterproof seal to IP67 / NEMA 4X is achievable, using the optional BEZ 700-IP bezel. 

## **FEATURES** 

- 12.7mm (0.5") Digit Height 

- 200mV d.c. Full Scale Reading 

- 3.0 to 7.5V or 6.0 to 15V d.c. Operation 

- Auto-zero and Auto-polarity 

- • Programmable Decimal Points • LED Backlighting (30mA @ 5V typ.) • Low Battery Warning • Bandgap Reference 

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## **TYPICAL APPLICATIONS** 

## **ORDERING INFORMATION** 

- Precision Instrumentation Systems 

- Power Supply Monitoring 

Stock Number • Test Boxes Standard Meter DPM 750S-BL • Panel-Mount Indication IP67 / NEMA 4X Bezel BEZ 700-IP • Low Power Voltage Measurement **ELECTRICAL SPECIFICATIONS Specification Min. Typ. Max. Unit** Accuracy (overall error) * 0.1 % (±1 count) Linearity ±1 count Sample rate 2.5 samples/sec Operating temperature range 0 50 °C Temperature stability 50 ppm/°C Supply voltage V+ to GND configuration 3 5 7.5 V d.c. V+ to V- configuration 6 9 15 V d.c. ~~a~~ Supply current V+ to GND confi ~~ee~~ guration ~~eee~~ 500 ~~ee eee~~ A V+ to V- configuration 350 A Backlight supply voltage 4.75 5.0 ** V d.c. ~~SS~~ Backlight supply current @ 5V d.c. 30 50 *** mA Input leakage current (Vin = 0V) 1 ~~ES~~ 10 ~~(S~~ pA ~~an~~ * To ensure maximum accuracy, re-calibrate periodically. ** An external series resistor is required above 5V, see Applications. *** This specification linearly derates to 30mA @ 50°C. Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =40kHz) 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). 

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 

DPM 750S-BL 

3½ Digit Backlit LCD Voltmeter Module 

## **DIMENSIONS** 

All dimensions in mm (inches) 

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55.0 (2.17) 1.6 (0.06)<br>Panel thickness:(0.041.0 -- 0.12)3.0 46.7 (1.84) 2.8 (0.11) dia<br>_ 6.1 (0.24)<br>°<br>; < alr<br>6.5<br>(0.26)<br>De | =<br>6.1 9.5<br>60 (2.36) (0.24) (0.37)<br>1.6<br>(0.06)<br>Panel cut-out: 62.0 x 32.0<br>(2.44 x 1.26)<br>PANEL FITTING<br>©Ss io Bre)<br>Insulating Shake-proof<br>Washer Washer<br><_ <_<br>@ 1 2 3<br>|<br>FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATION (rear view)<br>V+<br>Vref<br>,<br>CAL LCOM<br>COM E Rb<br>Ra La<br>BL- CAL<br>1 BEEBE HEHEHEEEE 10 6.3<br>(0.25)<br>INHI<br>A/D ete<br>+_ || 1 8 © 2.54 18.6 (0.73) o t<br>INLO (0.1)<br>V- GND DP3 2 1<br>Specifications liable to change without prior warning DPM 750S-BL Issue 5 06/2010 S.L. Applies to DPM 750S-BL/2<br>Page 2 of 4<br>www.lascarelectronics.com No.: 695 - Page 2 of 4<br>quascaR ssi“ <$s ‘ats<br>64.5 (2.54)<br>V m A °F °C M k Ohm Hz : ~<br>V+ GND BL- INHI INLO DP1 DP2 DP3 V- COM<br>(1.36)<br>34.5<br>19.0 (0.75)<br>25.0 (0.98) 17.7 (0.70) 30 (1.18)<br>**----- End of picture text -----**<br>


DPM 750S-BL 

3½ Digit Backlit LCD Voltmeter Module 

## **CIRCUIT DIAGRAM** 

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## **PIN FUNCTIONS** 

1. V+ PositivepowersupplytothemeterandLEDbacklighting. 2. GND 0Vpowersupplytothemeter. 3. BLNegativepowersupplytotheLEDbacklighting. 4. INHI Positivemeasuringinput. 5. INLO Negativemeasuringinput. 6. DP1 ConnecttoV+todisplayDP1(199.9). 7. DP2 ConnecttoV+todisplayDP2(19.99). 8. DP3 ConnecttoV+todisplayDP3(1.999). 9. V- Negativepowersupplytothemeter. 10. COM GroundfortheanaloguesectionoftheA/Dconverter. Itisactivelyheldat3.05V(nom.)belowV+andmustnotbeallowedtosinkexcessive current(>100 A)by,forinstance,connectingtoahighervoltage. 

Note: 

A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, then the internally generated V- is -5V. When measuring with the input referenced to the same supply rail as that of the panel meter,thenthelimitationsontheinputrangeare(V-+1.5V)to(V+-1.5V). 

## **SOLDER LINKS** 

LCOM NormallyOpen. Whensoldered,connectsCOMtoINLO. La NormallyClosed. ShortcircuitsthescalingresistorRa,ifRaisfittedonthemodule. 

_**Specifications liable to change without prior warning**_ **DPM 750S-BL Issue 5 06/2010 S.L. Applies to DPM 750S-BL/2** 

DPM 750S-BL 

3½ Digit Backlit LCD Voltmeter Module 

## **SCALING** 

|Two resistors Ra and Rb||||**FSR**||**Ra**||**Rb**|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|may be used to alter the<br>full scale reading (FSR) of||Voltage||2V<br>20V||910k<br>1M||100k<br>10k|+|||Ra|||||4|INHI|
|the meter - see table. The||Vin||200V||1M||1k|||||||||||
|meter will have to be re-||||2000V*||1M||100R|Vin or|I|in|||||Rb|||
|calibrated by adjusting the<br>calibration potentiometer<br>ontherearofthemodule.||in<br>I<br>Current||200 A<br>2mA<br>20mA<br>200mA||0R<br>0R<br>0R<br>0R||1k<br>100R<br>10R<br>1R|-||||||||5|INLO|
||*Ensure that Ra is rated for high voltage use.||*Ensure that Ra is rated for high voltage use.||||||||||||||||



## **APPLICATIONS** 

Do not connect more than one meter to the same power supply if the meters cannot use the same signal ground. Takinganyinputbeyondthepowersupplyrailswilldamagethemeter. 

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3.0 to 7.5V Meter Power Supply<br>+3.0 to +7.5V +3.0 to +7.5V +3.0 to +7.5V<br>1 1 1<br>V+ V+ V+<br>4 4 4<br>+ INHI + INHI I+ INHI<br>3 3 3<br>BL- ±200mV BL- Rb BL-<br>±200mV<br>SBL - 5 INLO SBL I- 5 INLO SBL<br>- 5 INLO<br>RBL = V+ - 5V RBL = V+ - 5V RBL = V+ - 5V<br>GND 30mA GND 30mA GND 30mA<br>2 2 2<br>0 0V 0V 0V<br>Measuring a single ended input voltage Measuring an input voltage referenced to a Measuring a current from a circuit which is<br>referenced to supply, i.e. the input floating supply, i.e. the input voltage and the floating with respect to the DPM's supply,<br>voltage and the meter's power supply meter's power supply are isolated from each i.e. the current and the meter's power<br>share the same 0V rail. Ensure solder other. Ensure solder link LCOM is closed. supply are isolated from each other. Ensure<br>link LCOM is open. solder link LCOM is closed.<br>6.0 to 15.0V Meter Power<br>+3.0 to +7.5V +6.0 to +15.0V +6.0 to +15.0V<br>1 1 1<br>V+ V+ V+<br>+ 4 INHI + 4 INHI I+ 4 INHI RBL = V+ - 5V<br>3 3 3 30mA<br>BL- ±200mV BL- Rb BL-<br>±200mV<br>SBL - 5 INLO SBL I- 5 INLO SBL<br>- 5 INLO<br>V- RBL = V+ 30mA- V- - 5V V- RBL = V+ 30mA- 5V V- RBL<br>9 9 9<br>-3.0 seat to -7.5V 0V ed 0V<br>Measuring a single ended input voltage Measuring an input voltage referenced to a Measuring a current from a circuit which is<br>referenced to a split supply, i.e. the input floating supply, i.e. the input voltage and floating with respect to the DPM's supply,<br>voltage and the meter's power supply the meter's power supply are isolated from i.e. the current and the meter's power<br>share the same 0V rail. Ensure solder link each other. Ensure solder link LCOM is supply are isolated from each other. Ensure<br>LCOM is open. closed. solder link LCOM is closed.<br>Specifications liable to change without prior warning DPM 750S-BL Issue 5 06/2010 S.L. Applies to DPM 750S-BL/2<br>**----- End of picture text -----**<br>