DPM 125

DPM 125 

3½ Digit LCD Module 

This compact LCD DPM is ideally suited for low or high volume applications. It features an exceptionally large display in a miniature package. The meter will plug directly into a SIL socket or can be panel mounted using the snap in bezel provided. The low profile bezel incorporatesaflatreverseprintedwindowgivingasuperbappearancethatcannotbedamagedorrubbedofbycontact. 

- **12.5mm (0.5“) Digit Height** 

- **Logic Selectable Decimal Points** 

- **Auto-zero** 

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- **Auto-polarity** 

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

- **Low Battery Indication** 

## **SCALING** 

Two resistors may be used to alter the full scale reading of themeter-seetable. 

**Stock Number** Note that the meter will have to be re-calibrated by **Standard Meter DPM 125** adjustingthecalibrationpot. **Specification Min. Typ. Max. Unit** ~~———~~ Accuracy (overall error) * 0.05 0.1 % (±1 count) Ra IN HI (7) Linearity ~~ae ee~~ ±1 count + Sample rate 3 samples/sec INPUT Rb Operating temperature range 0 50 °C - IN LO (8) Temperature stability 100 ~~_~~ ppm/°C ~~————~~ ~~**———**~~ Supply voltage (V+ to V-) 7.5 9 14 ~~—~~ V Supply current 150 A **Required F.S.R. Ra Rb** Input leakage current (Vin = 0V) 1 10 pA 2V 910k 100k * To ensure maximum accuracy, re-calibrate periodically. 20V 1M 10k 200V 1M 1k 2kV Note 10M 1k 200 A 0R 1k 2mA 0R 100R 20mA 0R 10R ~~=~~ 200mA 0R 1R **NOTE** Ensure Ra is rated for high voltage use. **DIMENSIONS All dimensions in mm (inches)** 

Note that the meter will have to be re-calibrated by adjustingthecalibrationpot. 

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48 (1.89) a b<br>a. 1.50 (0.06)<br>31.0 (1.22) b. 9.00 (0.35)<br>c. 5.00 (0.20)<br>d. 1.60 (0.06)<br>e. 4.00 (0.16)<br>f. 10.4 (0.41)<br>g. 7.50 (0.30)<br>h. 2.54 (0.10)<br>i. 0.50 (0.02)<br>Panel cut-out<br>Viewing Area showing 45 x 22.2 (1.77 x 0.87)<br>display in TEST mode<br>40.5 (1.59) d<br>apO 38.0 (1.50) cr c<br>REAR VIEW<br>9<br>11<br>4 ON BOARD SOLDER LINKS<br>DP3 DP2 DP1<br>1 3 2<br>Fl 12 1 k y e afd 12 1<br>g h i<br>ROH RHI RLO COM INLO INHI V+ V- TEST DP3 DP2 DP1<br>(0.55)<br>(0.94)<br>24 14.0<br>(0.72)<br>(0.80) f 18.2<br>20.4<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. Finally fit the window into the front of the bezel. 

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

**DPM 125 Issue 7 06/2010 S.L.** 

**Applies to DPM 125/2** 

**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** 

No.: 695 - Page 2 of 2 

## **PIN FUNCTIONS** 

1. DP1 199.9 

2. DP2 19.99 ConnecttoV+todisplayrequiredDP. 

3. DP3 1.999 

4. TEST ConnecttoV+todisplaysegmentsasillustrated. Itshouldnotbeoperatedformorethanafewsecondsasthed.c.voltageapplied totheLCDmay'burn'thedisplay. Thispinisnormallyat5VbelowV+andisthegroundforthedigitalsectionofthemeter.Itcanbe usedtopowerexternallogicuptoamaximumof1mA. 

5. V- Negativepowersupplyconnection. 

6. V+ Positivepowersupplyconnection. 

7. INHI Positivemeasuringdifferentialinput. 8. INLO Negativemeasuringdifferentialinput. Analogueinputsmustbenocloserthan1Vtoeitherthepositiveornegativesupply. 

9. COM ThegroundfortheanaloguesectionoftheA/Dconverter,heldactivelyat2.8V(nom.)belowV+. COMmustnotbeallowedtosink excessivecurrent(>100 A)byconnectingitdirectlytoahighervoltage. 

10. RLO Negativeinputforreferencevoltage(canbeconnectedtoCOMviaLink3). 

11. RHI Positiveinputforreferencevoltage(connectedviaLink1toROH). 

12. ROH Positiveoutputfrominternalreference. 

## **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 SHORTED OPEN<br>Cut to Solder to<br>to be easily cut (opened) or shorted (soldered). OPEN SHORT<br>Do not connect more than one meter to the same power supply if the meters cannot<br>use the same signal ground. Taking any input beyond the power supply rails will<br>damage the meter. V+ V+ V+<br>6 6 6<br>V+ V+ 510K V+<br>+ 7 IN HI 7<br>±200mV + 7 IN HI ±200mV - 8 IN LO 14V max7V min SUPPLY 10K IN HI<br>- 8 IN LO VOLTAGE 8 IN LO<br>0V<br>V- 1V V- 510K V-<br>5 min. 5 5<br>1 V- Oo V- V-<br>Check Links 2 & 3 are SHORTED. Check Link 3 is SHORTED. Check Link 3 is SHORTED.<br>Measuring a floating voltage source Split supply operation. Measuring a supply voltage.<br>of 200mV full scale. (min. 7.5V, max. 14V).<br>V+ V+<br>6 V+ 6 IIN 6<br>7 V+ + 7 IN HIV+ 7 IN HI V+<br>+ IN HI V1 - 8 IN LO 100K<br>R - 11 6R2 5K SET 8 IN LO<br>+ REF HI ZERO<br>- R=IF.S.R.0.2 8 IN LOV- V2 - 10 REF LOV- 9 COMV-<br>mo 5 V- 5 V- IOUT 5 V-<br>Check Links 2 & 3 are SHORTED. Check Links 1 & 4 are OPEN. Check Link 3 is SHORTED.<br>Measuring current. Supply MUST Measuring the ratio of two voltages. Measuring 4-20mA to read 0-999.<br>be isolated. Reading = 1000 V1/V2 (supply MUST be isolated).<br>50mV< V2<200mV<br>V1<2V2.<br>**----- End of picture text -----**<br>


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

**Issue 7 06/2010** 

**Applies to DPM 125/2** 

**S.L.** 

**DPM 125**