DPM125

DPM 125 3 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 incorporates a flat reverse printed window giving a superb appearance that cannot be damaged or rubbed of by contact. 12.5mm (0.5) Digit Height Logic Selectable Decimal Points Auto-zero + - 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 the meter - see table. Stock Number Note that the meter will have to be re-calibrated by Standard Meter DPM 125 adjusting the calibration pot . Specification Min. Typ. Max. Unit Accuracy (overall error) * 0.05 0.1 % (1 count) Ra Linearity 1 count IN HI (7) + Sample rate 3 samples/sec Operating temperature range 0 50 C INPUT Rb IN LO (8) Temperature stability 100 ppm/C - Supply voltage (V+ to V-) 7.5 9 14 V Supply current 150 m A Input leakage current (Vin = 0V) 1 10 pA Required F.S.R. Ra Rb 2V 910k 100k * To ensure maximum accuracy, re-calibrate periodically. 20V 1M 10k 200V 1M 1k 2kV Note 10M 1k 200m 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) 48 (1.89) ab a. 1.50 (0.06) b. 9.00 (0.35) 31.0 (1.22) c. 5.00 (0.20) d. 1.60 (0.06) e. 4.00 (0.16) f. 10.4 (0.41) g. 7.50 (0.30) h. 2.54 (0.10) i. 0.50 (0.02) Panel cut-out Viewing Area showing 45 x 22.2 (1.77 x 0.87) display in TEST mode 40.5 (1.59) d 38.0 (1.50) c REAR VIEW 9 11 4 ON BOARD SOLDER LINKS DP3 DP2 DP1 1 3 2 12 1 12 1 e gh i 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. 20.4 (0.80) 24 (0.94) f ROH RHI RLO COM IN LO IN HI V+ V- TEST DP3 DP2 DP1 18.2 (0.72) 14.0 (0.55)LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. LASCAR ELECTRONICS (HK) LIMITED MODULE HOUSE, WHITEPARISH, 3750 West 26th Street, FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD WILTSHIRE SP5 2SJ UK Erie, PA 16506 USA 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 2797 3219 FAX: +852 2343 6187 E-mail: sales lascar.co.uk E-mail: us-sales lascarelectronics.com E-mail: b4lascar samsongroup.com.hk PIN FUNCTIONS 1. DP1 199.9 2. DP2 19.99 Connect to V+ to display required DP. 3. DP3 1.999 4. TEST Connect to V+ to display segments as illustrated. It should not be operated for more than a few seconds as the d.c. voltage applied to the LCD may burn the display. This pin is normally at 5V below V+ and is the ground for the digital section of the meter. It can be used to power external logic up to a maximum of 1mA. 5. V- Negative power supply connection. 6. V+ Positive power supply connection. 7. IN HI Positive measuring differential input. Analogue inputs must be no closer than 1V to either the positive or negative supply. 8. INLO Negative measuring differential input. 9. COM The ground for the analogue section of the A/D converter, held actively at 2.8V (nom.) below V+. COM must not be allowed to sink excessive current (>100m A) by connecting it directly to a higher voltage. 10. RLO Negative input for reference voltage (can be connected to COM via Link 3). 11. RHI Positive input for reference voltage (connected via Link 1 to ROH). 12. ROH Positive output from internal reference. SAFETY To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the modules 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 users equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and Laboratory Use). VARIOUS OPERATING MODES Normally ON-BOARD LINKS: In order to quickly and easily change operating modes for Normally SHORTED OPEN different applications, the meter has several on-board links. They are designed Cut to Solder to to be easily cut (opened) or shorted (soldered). OPEN SHORT 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. V+ V+ V+ 6 6 6 510K V+ V+ V+ 7 + IN HI 7 7 IN HI + IN HI 200mV 8 14V max - IN LO 10K 200mV 7V min SUPPLY 8 8 - IN LO VOLTAGE IN LO 0V V- V- 1V V- 510K 5 5 min. 5 V- V- V- Check Links 2 & 3 are SHORTED. Check Link 3 is SHORTED. Check Link 3 is SHORTED. Measuring a floating voltage source Split supply operation. Measuring a supply voltage. of 200mV full scale. (min. 7.5V, max. 14V). V+ V+ V+ 6 6 IIN 6 V+ V+ 7 7 V+ + IN HI 7 IN HI + IN HI 100K V1 8 - IN LO 6R2 SET 8 R -- 5K 11 IN LO + REF HI ZERO 8 V2 9 10 IN LO - REF LO COM - R=0.2 V- V- V- IF.S.R. 5 5 5 IOUT V- V- V- Check Links 1 & 4 are OPEN. Check Link 3 is SHORTED. Check Links 2 & 3 are SHORTED. Measuring current. Supply MUST Measuring the ratio of two voltages. Measuring 4-20mA to read 0-999. be isolated. Reading = 1000 V /V (supply MUST be isolated). 12 50mV< V <200mV 2 V <2V . 12 Specifications liable to change without prior warning DPM 125 Issue 4 August/2002 M.C. Applies to DPM 125/2