SP 300-BLUE

SP 300-BLUE 

3½ Digit LED Voltmeter Module 

## **PRODUCT DESCRIPTION** 

The SP 300-BLUE features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user selectable. The SP 300-BLUE features a negative rail generator which enables the meter to measure a signal referenced to its own power supply 0V. The blue LED display ensures excellent readability under low light conditions. The module is easily fitted into the panel, using the fixing clip provided. The module's low cost means it will suit high and low volume applications. The design of the panel meter's housing and seal ensures splash proofing in many applications. 

## **FEATURES** 

- 9.4mm (0.37") Digit Height 

- Blue LED Display 

- 200mV d.c. Full Scale Reading 

- 50mA @ +5V d.c. Power Supply 

- Auto-zero and Auto-polarity 

- • Programmable Decimal Points 

- Simplified Connection 

- Splash Proof 

## **TYPICAL APPLICATIONS** 

- Precision Instrumentation Systems 

- Power Supply Monitoring 

## **ORDERING INFORMATION** 

Stock Number Standard Meter **SP 300-BLUE** 

- Test Boxes 

- Panel-Mount Indication 

**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 Warm-up time 10 minute Temperature stability 150 ppm/°C Supply voltage 4.75 5 5.25 V Supply current 50 mA ~~pn~~ Input leakage current (Vin = 0V) 1 10 pA * To ensure maximum accuracy, re-calibrate periodically. **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) LIMITED MODULE HOUSE 3750 West 26th Street FLAT C, 5/FL., LUCKY FTY. BLDG. WHITEPARISH Erie 63-65 HUNG TO ROAD WILTSHIRE SP5 2SJ PA 16506 KWUN TONG KOWLOON UK USA HONG KONG TEL: +44 (1794) 884567 TEL: +1 (814) 835 0621 TEL: +852 2797 3219 FAX: +44 (1794) 884616 FAX: +1 (814) 838 8141 FAX: +852 2343 6187 E-mail: sales@lascar.co.uk E-mail: us-sales@lascarelectronics.com E-mail: b4lascar@samsongroup.com.hk _**Specifications liable to change without prior warning**_ **SP 300-BLUE Issue 4 SEP/2005 M.C. Applies to SP 300/1** Page 2 of 4 www.lascarelectronics.com Page 1 of 4 

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). 

SP 300-BLUE 

3½ Digit LED Voltmeter Module 

## **DIMENSIONS** 

All dimensions in mm (inches) 

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27.9 (1.10) a b c<br>2.54 (0.1)<br>33.0 (1.30)<br>a. 0.75 (0.03)<br>b. 10.00 (0.39)<br>c. 6.00 (0.24)<br>Panel thickness: 1.0 - 3.0<br>(0.04 - 0.12)<br>PANEL FITTING<br>Panel<br>Module Seal Fixing Clip<br>1 2 3 4<br>FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATION (rear view)<br>V+<br>Vref<br>CAL<br>COM CAL LCOM RB<br>RA<br>LA<br>1 8<br>IH<br>A/D<br>+_ 1 8<br>IL<br>0V DP3 2 1<br>Specifications liable to change without prior warning SP 300-BLUE Issue 4 SEP/2005 M.C. Applies to SP 300/1<br>Page 2 of 4<br>www.lascarelectronics.com Page 2 of 4<br>34 (1.34)<br>35.1 (1.38)<br>Preliminary Data<br>V+ 0V COM IH IL DP1 DP2 DP3<br>(0.81)<br>(0.88)<br>20.5<br>22.4<br>(0.84)<br>21.3<br>**----- End of picture text -----**<br>


3½ Digit LED Voltmeter Module 

## SP 300-BLUE 

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CIRCUIT DIAGRAM<br>**----- End of picture text -----**<br>


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1<br>4<br>5<br>3<br>2<br>**----- End of picture text -----**<br>


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8<br>7<br>6<br>9<br>16<br>**----- End of picture text -----**<br>


## **PIN FUNCTIONS** 

1. V+ Positivepowersupplytothemeter. 2. 0V 0Vpowersupplyconnectiontothemeter. 3. COM Ground for analogue section of A/D converter. Itisactivelyheldat3.05V(nom)belowV+andmustnotbeallowedtosinkexcessivecurrent (>100 A)by,forinstance,connectingtoahighervoltage. 4. IH Positivemeasuringinput. 5. IL Negativemeasuringinput. 6. DP1 Connectto0VtodisplayDP1(199.9). 7. DP2 Connectto0VtodisplayDP2(19.99). 8. DP3 Connectto0VtodisplayDP3(1.999). 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 thatofthepanelmeter,thenthelimitationsontheinputrangeare(V-+1.5V)to(V+-1.5V). SolderLinks: LCOM NormallyOpen. ConnectsILtoCOM. 

_**Specifications liable to change without prior warning**_ **SP 300-BLUE Issue 4 SEP/2005 M.C. Applies to SP 300/1** 

www.lascarelectronics.com 

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SP 300-BLUE 

3½ Digit LED Voltmeter Module 

## **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**|||LA|LA|LA|LA||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||||2V||910k**||100k||||||||||||
||Voltage||20V||1M**||10k|+|||||||||4|IH|
||||200V||1M**||1k|||Ra|||||||||
||Current||2000V*<br>200 A<br>2mA<br>20mA<br>200mA||1M**<br>0R<br>0R<br>0R<br>0R||100R<br>1k<br>100R<br>10R<br>1R|-<br>Vin or|in<br>I||||Rb||||5|IL<br>SP 300-BLUE|
|*<br>Ensure that Ra is rated for high voltage use.||Ensure that Ra is rated for high voltage use.|||||||||||||||||



** Ensure solder link LA is cut. 

## **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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V+ V+ V+<br>1 1 Set Zero 1<br>V+ V+ 220k V+<br>+ 4 IH + 4 IH 5k 5 IL<br>±200mV- 5 IL ±200mV- 5 IL 4-20mA I+ 3 COM<br>current loop R<br>3 COM I- 4 IH<br>0V 0V 0V<br>2 2 2<br>1 0V 0 0V = 0V<br>Measuring an input voltage referenced Measuring a single ended input Measuring a 4-20mA loop current.<br>to a floating supply, i.e. the input voltage referenced to supply, i.e. the R= Reading at 20mA<br>voltage and the meter's power supply input voltage and the meter's power 160<br>are isolated from each other. supply share the same 0V rail.<br>The meter's power supply must be<br>isolated from the 4-20mA current<br>loop.<br>I<br>+5V<br>7805 1 Ra=1M 1 V+<br>V+ V+<br>Vsupply 220nF 10uF470nF 3 COM IH 4S1 VA Load RL R 45 IHIL<br>IL 5 Rb=1k 3 COM<br>R = 0.2<br>0V 0V<br>With} 2 Rs = IFSR f 2 0V<br>Shunt<br>Measuring supply voltage and current to a load. Measuring current.<br>The meter's supply is isolated<br>S1 selects between voltage and current measurement. from the current being measured.<br>Ra and Rb shown scaled for 200VFSR Rs = 200mV (e.g. 0.1 / 400mW for 2A full scale)<br>IFSR<br>Display DP1, DP2 or DP3, by connecting to 0V, as required.<br>Preliminary Data<br>**----- End of picture text -----**<br>


The meter's power supply must be 

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Specifications liable to change without prior warning SP 300-BLUE Issue 4 SEP/2005 M.C. Applies to SP 300/1<br>**----- End of picture text -----**<br>


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