DPM 400

3½ Digit LCD Module 

## DPM 400 

—EEE No.:695 - Page 1 of 2 

A unique compact LCD meter, ideally suited to low or high volume applications. The meter has a 28 pin DIL integrated circuit format and can be plugged directly into a DIL socket or panel mounted using the snap in bezel provided. The low profile bezel incorporates a flatreverseprintedwindow,givingasuperbappearancethatcannotbedamagedorremovedbycontact. 

- **10mm (0.4“) Digit Height** 

- **Programmable Decimal Points** 

- **Auto-zero** 

- **Auto-polarity** 

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- [+] °C°FA<br>m V<br>k<br>VE={ Ke eM eL Le: MHz<br>**----- End of picture text -----**<br>


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

- **Annunciators** 

## **SCALING** 

Two resistors can be used fitted in order to alter the full scalereadingofthemeter-seetable. The meter will have to be re-calibrated by adjusting the calibrationpotentiometerCAL. 

|**Specification**<br>es|**Min.**<br>es<br>~~ee~~<br>~~es~~|**Typ.**<br>es<br>~~es~~|**Max.**<br>es<br>~~ee~~|**Unit**<br>es|
|---|---|---|---|---|
|Accuracy (overall error)*<br>~~es~~|~~ee~~<br>~~es~~<br>~~es~~<br>~~ee~~|0.05<br>~~es~~<br>~~es~~<br>~~eS~~|0.1<br>~~ee~~<br>~~es~~|%(±1 count)<br>~~es~~|
|Linearity<br>~~es~~|~~es~~<br>~~es~~<br>~~ee~~|~~es~~<br>~~eS~~|±1<br>~~es~~|count<br>~~es~~|
|Sample rate<br>~~es~~|~~ee~~<br>~~es~~|3<br>~~eS~~<br>~~es~~|~~es~~|samples/sec<br>~~es~~|
|Operatingtemperature range<br>~~ee~~|0<br>~~ee~~<br>~~ee~~|~~ee~~|50<br>~~ee~~|°C<br>~~ee~~|
|Temperature s<br>l<br>tability<br>volta<br>~~es~~<br>~~Ss~~|~~es~~<br>~~ee~~<br>~~Ss~~|100<br>~~es~~<br>~~Ss~~|~~es~~<br>~~Ss~~|ppm/°C<br>~~es~~<br>~~Ss~~|
|Supply<br>(V+ to V-)<br>Low batterthreshold<br>voltage<br>~~Ss~~<br>~~Ss~~|7<br>~~ee~~<br>~~Ss~~<br>~~Ss~~<br>~~ee~~|9<br>~~Ss~~<br>~~Ss~~|14<br>~~Ss~~<br>~~Ss~~|V<br>~~Ss~~<br>~~Ss~~|
|Low batterythreshold<br>~~Ss~~|~~Ss~~<br>~~ee~~<br>~~es~~|7.5<br>~~Ss~~|~~Ss~~|V<br>~~Ss~~|
|Supplycurrent<br>~~es~~|~~ee~~<br>~~es~~<br>~~es~~<br>~~es~~|150<br>~~es~~<br>~~es~~|~~es~~|A<br>~~es~~|
|Input leakage current (Vin= 0V)<br>~~es~~<br>~~Ss~~|~~es~~<br>~~es~~<br>~~Ss~~<br>~~es~~|1<br>~~es~~<br>~~Ss~~<br>~~es~~|10<br>~~es~~<br>~~Ss~~|pA<br>~~es~~<br>~~Ss~~|



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Ra<br>IN HI (10)<br>+<br>INPUT Rb<br>- IN LO (11)<br>**----- End of picture text -----**<br>


|-|||Rb||IN LO (11)|Temperature s<br>100<br>ppm/°C<br>Supply<br>(V+ to V-)<br>7<br>9<br>14<br>V<br>Low batterythreshold<br>7.5<br>V<br>tability<br>voltage<br>~~ee~~<br>~~es~~<br>~~ee~~<br>~~Ss~~<br>~~Ss~~<br>~~ee~~<br>~~es~~|
|---|---|---|---|---|---|---|
|**Required F.S.R.**<br>2V<br>20V<br>200V|||**Ra**<br>910k<br>1M<br>1M||**Rb**<br>100k<br>10k<br>1k|Supplycurrent<br>150<br>A<br>Input leakage current (Vin= 0V)<br>1<br>10<br>pA<br>* To ensure maximum accuracy, re-calibrate periodically.<br>~~Ss~~<br>~~ee~~<br>~~es~~<br>~~es~~<br>~~Ss~~<br>~~es~~<br>~~es~~|
|2kV|Note||1M||100R||
|200 A<br>2mA<br>20mA<br>200mA|||0R<br>0R<br>0R<br>0R||1k<br>100R<br>10R<br>1R|**CONNECTOR SOURCING GUIDE**<br>**28 Pin DIL IC Socket**<br>**METHOD**<br>_——<br>°°<br>~~CCC)~~|



**Note** 

EnsureRaisratedforhighvoltageuse. 

## **DIMENSIONS All dimensions in mm (inches)** 

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48.0 (1.89) a b<br>mm __—_—_——+| “ l e 31.0 (1.22) a. 1.50 (0.06)<br>b. 9.00 (0.35)<br>c. 3.70 (0.15)<br>d. 2.54 (0.10)<br>e. 0.50 (0.02)<br>f. 5.00 (0.20)<br>g. 1.60 (0.06)<br>Display in TEST mode h. 4.00 (0.16)<br>Panel cut-out 45 x 22 (1.77 x 0.87)<br>A+] 40.5 (1.59) at f in g h<br>4 11 9 ON BOARDSOLDER LINKS<br>3 2<br>= 1 ==<br>1<br>14<br>| ~ - =| ||<br>c d e<br>V m A °C V+ V- CLOCK ~ :<br>M K IN LO IN HI COM REF LO REF HI DP1 DP2 DP3 XDP BP TEST<br>24.0 (0.84) 13.0 (0.51)<br>20.5 (0.80) 15.24 (0.60) 18.2 (0.72)<br>**----- End of picture text -----**<br>


## **PANEL FITTING** 

Fit the bezel to the front of the panel and then locate the meter into the bezel from behind. Alternatively the meter and bezel may be assembled before fitting into the front of the panel but care must be taken not to use excessive force. 

**LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. LASCAR ELECTRONICS (HK) LTD. MODULE HOUSE, WHITEPARISH, 4258 WEST 12th STREET, 8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN WILTSHIRE SP5 2SJ UK ERIE, PA 16505 USA ROAD, KWUN TONG, KOWLOON, HONG KONG TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616 TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141 TEL: +852 2389 6502 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. TEST ConnecttoV+todisplaysegmentsasillustrated. ItshouldnotbeoperatedformorethanafewsecondsastheDCvoltageapplied totheLCDmay‘burn'thedisplay. Thispinisnormallyat5VbelowV+andisthegroundforthedigitalsectionofthemeter. Itcan beusedtopowerexternallogicuptoamaximumof1mA. 

2. BP LCDbackplanedrivewaveform. 

3. XDP Connecttorequiredannunciators/DPs(seenote). 

4. DP3 1.999 

5. DP2 19.99 6. DP1 199.9 

7. REFHI Positiveinputforreferencevoltage(connectedvialink1tointernalreference). 

8. REFLO Negativeinputforreferencevoltage(connectedvialink3toCOM). `9. COM ThegroundfortheanaloguesectionoftheA/Dconverter,heldactivelyat2.8V(nom.)belowV+. COMmustnotbeallowedto sinkexcessivecurrent(>100 A)byconnectingitdirectlytoahighervoltage. 

10. INHI Positivemeasuringinput. Analogueinputsmustbenocloserthan1Vtoeitherthepositiveornegativesupply. 11. INLO Negativemeasuringinput. 24. V+ Positivepowersupply. 25. V- Negativepowersupply. 26. CLOCK Clockoutputmaybeusedforsystemstimingorasaninputtooverridetheinternaloscillatorandcontrolthesamplerate. 

## **SPECIAL NOTE: ANNUNCIATORS** 

The DPM annunciators (DPs, °C, etc.) can be shown by connecting them to XDP. However, as these annunciators are normally 'floating' under certain conditions they may appear when not wanted. To suppress unwanted annunciators link them to the backplane (BP). If the annunciators are being switched, connect them via a 1M resistor to the BP (pin 2). The annunciators will then operate normally when connected to XDP. Ensure that an annunciatorisNOTconnecteddirectlytotheXDPandBPatthesametime. 

## **SAFETY** 

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 Requirements for Electrical Equipment for Measuring,ControlandLaboratoryUse). 

## **VARIOUS OPERATING MODES** 

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ON-BOARD LINKS: In order to quickly and easily change operating modes for Normally Normally<br>different applications the meter has several on-board links. They are designed SHORTEDCut to OPENSolder to<br>to be easily opened (cut) or shorted (soldered). Do not connect more than one meter OPEN SHORT<br>to the same power supply if the meters cannot use the same signal ground.<br>Taking any input beyond the power supply rails will damage the meter.<br>V+ V+ V+<br>24 24 24<br>V+ V+ 510K V+<br>10<br>+ IN HI 10 IN HI<br>+ 10 IN HI ±200mV - 11 IN LO 14V max. 10K<br>±200mV - 11 IN LO 7V min. SUPPLYVOLTAGE 11 IN LO<br>V- 0V V- 510K V-<br>25 1vmin. 25 25<br>lL V- V- V-<br>Check Link 2 is OPEN.<br>Check Link 2 is SHORTED.<br>Measuring a floating voltage source Split supply operation. Measuring a supply voltage<br>of 200mV full scale. (min. 7V, max. 14V).<br>V+ V+ V+<br>24 24 IIN 24<br>V+ + 10 IN HIV+ 10 IN HI V+<br>10 IN HI V1 - 11 IN LO 100K<br>R<br>11 IN LO + 7 REF HI 6R2 5K SET 11 IN LO<br>R= [0.2] V2 - 8 REF LO ZERO 9 COM<br>IFSR V- V- V-<br>fo 25V- 25 V- IOUT 25 V-<br>Check Link 2 is SHORTED. Check Link 1, 3 & 4 are OPEN.<br>Measuring current Measuring the ratio of two voltages. Measuring 4-20mA to read 0-999<br>(supply MUST be isolated). Reading = 1000 V1/V2 (supply MUST be isolated).<br>50mV < V2 <200mV<br>V1< 2V2.<br>Specifications liable to change without prior warning DPM 400 Issue 7 06/2010 S.L. Applies to DPM 400/7<br>**----- End of picture text -----**<br>


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

**Applies to DPM 400/7**