SP400

SP 400 

3½ Digit Backlit LCD Voltmeter Module 

## **PRODUCT DESCRIPTION** 

The SP 400 features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user selectable. The SP 400 features a negative rail generator which enables the meter to measure a signal referenced to its own power supply GND. LED backlighting 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 ensures splash proofing using the supplied seal. 

## **FEATURES** 

- 9.75mm (0.38") Digit Height 

- 200mV d.c. Full Scale Reading 

- 3.0 to 7.5V or 6.0 to 15.0V Operation 

- Auto-zero and Auto-polarity 

- • Programmable Decimal Points • LED Backlighting 

- Low Battery Warning 

- Splash Proof 

## **TYPICAL APPLICATIONS** 

- Precision Instrumentation Systems 

- Power Supply Monitoring 

## **ORDERING INFORMATION** 

Stock Number Standard Meter **SP 400** 

- Test Boxes 

- Panel-Mount Indication 

- Low Power Voltage Measurement 

## **ELECTRICAL SPECIFICATIONS** 

|**Specification**|**Specification**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|---|
|Accuracy (overall error) *<br>~~a~~|||0.1|~~(~~|%(±1 count)<br>~~(~~|
|Linearity<br>~~a~~||~~SS~~|~~SS~~|±1<br>~~(~~|count<br>~~(~~|
|Sample rate<br>~~a~~||~~(~~|2.5<br>~~( ~~|~~(~~<br>~~es~~|samples/sec<br>~~(~~|
|Operatingtemperature range<br>~~a~~||0<br>~~a~~|~~Ss~~|50<br>~~Ss~~<br>~~es~~|°C<br>~~Ss~~|
|Temperature stability|||100|~~es~~|ppm/°C|
|Supply voltage<br>~~a~~|V+ to GND<br>configuration|3.0|5.0|7.5|V d.c.|
||V+ to V-<br>configuration<br>~~rr~~|6.0<br>~~es~~|9.0<br>~~es~~|15.0**<br>~~ee~~|V d.c.<br>~~ee~~|
|Supply current<br>~~a~~<br>~~eS~~|V+ to GND<br>configuration<br>~~rr~~|~~es~~|350<br>~~es~~|~~ee~~|A<br>~~ee~~|
||V+ to V-<br>configuration<br>~~rr~~<br>~~eS~~|~~es~~|175<br>~~es~~|~~ee~~|A<br>~~ee~~|
|Backlight supplyvoltage<br>~~a~~<br>~~rr~~<br>~~eS~~||4.75<br>~~es ~~|5.0<br> ~~es ~~|***<br> ~~ee ~~|V d.c.<br> ~~ee~~|
|Backlight supplycurrent @ 5V d.c.<br>~~eS~~|||40|80****|mA|
|Input leakage current (Vin = 0V)|||1|10|pA|



* To ensure maximum accuracy, re-calibrate periodically. 

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

*** An external series resistor is required above 5V, see Applications. 

**** This specification linearly derates to 50mA @ 50°C. 

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

**==> picture [277 x 58] intentionally omitted <==**

**----- Start of picture text -----**<br>
LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC.<br>MODULE HOUSE, 4258 WEST 12th STREET,<br>WHITEPARISH, ERIE,<br>WILTSHIRE SP5 2SJ, PA 16505,<br>UK USA<br>TEL: +44 (1794) 884567 TEL: +1 (814) 835 0621<br>FAX: +44 (1794) 884616 FAX: +1 (814) 838 8141<br>E-mail: sales@lascar.co.uk E-mail: us-sales@lascarelectronics.com<br>**----- End of picture text -----**<br>


**==> picture [111 x 58] intentionally omitted <==**

**----- Start of picture text -----**<br>
LASCAR ELECTRONICS (HK) LTD.<br>8th FLOOR, CHINA AEROSPACE CENTRE,<br>143 HOI BUN ROAD,<br>KWUN TONG, KOWLOON,<br>HONG KONG<br>TEL: +852 2389 6502<br>FAX: +852 2389 6535<br>E- mail: saleshk@lascar.com.hk<br>**----- End of picture text -----**<br>


SP 400 

3½ Digit Backlit LCD Voltmeter Module 

## **DIMENSIONS** 

**==> picture [467 x 188] intentionally omitted <==**

**----- Start of picture text -----**<br>
All dimensions in mm (inches) a. 0.75 (0.03)<br>b. 10.00 (0.39)<br>c. 6.00 (0.24)<br>a b c<br>2.54 (0.1) pitch<br>7.56 (0.3) 5.02 (0.2)<br>33.0 (1.30)<br>Panel thickness: 1.0 - 3.0<br>(0.04 - 0.12)<br>34 (1.34)<br>35.1 (1.38)<br>(0.81)<br>(0.88)<br>22.4 20.5 (0.2) (0.03)<br>5.1 0.64<br>(0.84)<br>21.3<br>**----- End of picture text -----**<br>


All dimensions in mm (inches) 

## **PANEL FITTING** 

**==> picture [426 x 152] intentionally omitted <==**

**----- Start of picture text -----**<br>
Panel<br>Module Seal Fixing Clip<br>1 2 3 4<br>**----- End of picture text -----**<br>


## **FUNCTIONAL BLOCK DIAGRAM** 

**==> picture [194 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
PIN CONFIGURATION (rear view)<br>**----- End of picture text -----**<br>


**==> picture [383 x 145] intentionally omitted <==**

**----- Start of picture text -----**<br>
V+<br>Vref<br>CAL<br>BL- LCOM LBAT<br>CAL<br>1 9<br>INH<br>A/D<br>+_ 1 8<br>INL<br>V- GND DP3 2 1<br>V+ GND BL- INH INL DP1 DP2 DP3 V-<br>**----- End of picture text -----**<br>


Page 2 of 4 www.lascarelectronics.com No: 695 - Page 2 of 4 Qusck 

SP 400 

3½ Digit Backlit LCD Voltmeter Module 

## **CIRCUIT DIAGRAM** 

**==> picture [82 x 7] intentionally omitted <==**

**----- Start of picture text -----**<br>
RA and RB factory fitted options<br>**----- End of picture text -----**<br>


**==> picture [93 x 5] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pins 11 and 18 not fitted as standard<br>**----- End of picture text -----**<br>


## **PIN FUNCTIONS** 

1. V+ Positive power supply to the meter. 

2. GND 0V power supply to the meter (3.0 to 7.5V meter power supply applications only). 

3. BLConnect to the meter's negative supply voltage to switch on the LED backlighting. For meter supply voltages above 5V, add a series resistor Rs. See Applications for suitable circuit diagrams. 

4. INH Positive measuring input. 

5. INL Negative measuring input. 

6. DP1 Connect to V+ to display DP1 (199.9). 

7. DP2 Connect to V+ to display DP2 (19.99). 

8. DP3 Connect to V+ to display DP3 (1.999). 

9. V- Negative power supply to the meter (6.0 to 15.0V meter power supply applications only). 

## 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, then the limitations on the input range are (V- + 1.5V) to (V+ - 1.5V). 

## Solder Links: 

LCOM Normally Open. Connects INL to COM. LBAT Normally Closed. Cut this link to disable the low battery warning sign. 

SP 400 

3½ Digit Backlit LCD Voltmeter Module 

## **SCALING** 

|**SCALING**|||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Two external resistors Ra||||**FSR**||**Ra**||**Rb**|||||||||||
|and Rb may be used to<br>alter the full scale reading||Voltage||2V<br>20V||910k<br>1M||100k<br>10k|+|||Ra|||||4|INH|
|(FSR) of the meter - see<br>table. The meter will have||||200V<br>2000V*||1M<br>1M||1k<br>100R|Vin or|I|in|||||Rb||SP 400|
|to be re-calibrated by<br>adjusting the calibration<br>potentiometer on the rear<br>of the module.|Current<br>*Ensure that Ra is rated for high voltage use.||200 A<br>0R<br>2mA<br>0R<br>20mA<br>0R<br>200mA<br>0R<br>*Ensure that Ra is rated for high voltage use.|||||1k<br>100R<br>10R<br>1R|-||||||||5|INL|



## **APPLICATIONS** 

Do not connect more than one meter to the same power supply if the meters cannot use the same signal ground. Taking any input beyond the power supply rails will damage the meter. 

5V supply operation (3.0 to 7.5V Meter Power Supply) 

**==> picture [467 x 416] intentionally omitted <==**

**----- Start of picture text -----**<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 INH DP1 6 + 4 INH I+ 4 INH<br>7<br>DP2 8 ±200mV BL- 3 Rb<br>±200mV DP3<br>- 5 INL I- 5 INL<br>- 5 INL No DP<br>if V+>5V then<br>GND GND Rs=(V+ - 5V) GND<br>0.04<br>2 2 2<br>0V 0V 0V<br>Measuring a single ended input Measuring an input voltage referenced to Measuring a current from a circuit which is<br>voltage referenced to supply, i.e. the a floating supply, i.e. the input voltage floating with respect to the DPM's supply,<br>input voltage and the meter's power LP and the meter's power supply are isolated i.e. the current and the meter's power h al<br>supply share the same 0V rail. from each other. supply are isolated from each other.<br>Ensure solder link LCOM is open. Ensure solder link LCOM is closed. Ensure solder link LCOM is closed.<br>9V supply operation (6.0 to 15.0V Meter Power Supply)<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 INH + 4 INH I+ 4 INH<br>±200mV BL- 3 ±200mV BL- 3 Rb<br>- 5 INL I- 5 INL<br>- 5 INL<br>V- Rs=(V+) - (V-) - 5V V- Rs=(V+ - 5V) V-<br>0.04 0.04<br>9 9 9<br>-3.0 to -7.5V 0V 0V<br>Measuring a single ended input Measuring an input voltage referenced to Measuring a current from a circuit which is<br>voltage referenced to supply, i.e. the a floating supply, i.e. the input voltage floating with respect to the DPM's supply,<br>input voltage and the meter's power Oh and the meter's power supply are isolated i.e. the current and the meter's power a L<br>supply share the same 0V rail. from each other. supply are isolated from each other.<br>Ensure solder link LCOM is open. Ensure solder link LCOM is closed. Ensure solder link LCOM is closed.<br>**----- End of picture text -----**<br>


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

**==> picture [268 x 9] intentionally omitted <==**

**----- Start of picture text -----**<br>
SP 400 Issue 9 06/2010 S.L. Applies to SP 400/3<br>**----- End of picture text -----**<br>