DPM 950 3 Digit LCD Module Very low current consumption results in a long battery life and makes the DPM 950 ideal for portable equipment. For low light viewing, a long life LED backlight is fitted. The meter is housed in a robust carrier which can be bolted in place or panel mounted using the bezel, window and clips provided. 19mm (0.75) Digit Height IDC Interface Auto-zero Auto-polarity 200mV d.c. Full Scale Reading (F.S.R.) LED Backlight Single Rail Version Alarm Annunciator Stock Number Standard Meter DPM 950 SCALING Single Rail Version DPM 950S Two resistors Ra and Rb may be fitted in order to alter the full scale reading (F.S.R.) of the meter - see table. Specification Min. Typ. Max. Unit The meter will need re-calibration. Accuracy (overall error) ** 0.05 0.1 % (1 count) Linearity 1 count Sample rate 3 samples/sec Required F.S.R. Ra Rb Operating temperature range 0 50 C 2V Note 910k 100k Temperature stability 100 ppm/C 20V Note 1M 10k Supply voltage DPM 950 7.5 9 14 200V Note 1M 1k V (V+ to V-) DPM 950S 3.5 5 6.5 2kV Note 1M 100R Supply current DPM 950 150 200m A LINK 1k m A (not including backlight) DPM 950S 500 2mA LINK 100R Backlight current * 50 mA 20mA LINK 10R Input leakage current (Vin = 0V) 1 10 pA 200mA LINK 1R * Supply voltage 5V nom. ** To ensure maximum accuracy, re-calibrate periodically. NOTE Ensure that Link 10 is open if fitting Ra. CONNECTOR SOURCING GUIDE METHOD Cable Mounting IDC Supplied With Product DIMENSIONS All dimensions in mm (inches) 76.0 (2.99) a 72.5 (2.85) a. 1.0 (0.04) b. 2.0 (0.08) c. 6.5 (0.26) d. 11.5 (0.45) e. 9.5 (0.37) 51 (2.01) REAR VIEW Display in Test Mode 51.0 (2.01) Panel cut-out 72 x 40 (2.83 x 1.57) b c Maximum panel thickness 3mm (0.12). 61.5 (2.42) d e 51.0 (2.01) 5.7 (0.22) 11 ON BOARD 2341 SOLDER LINKS Ra 12 Rb SCALING RESISTORS REAR DP2 VIEW DP3 CAL Ra Rb DP1 3.0 71.5 (2.81) (0.12) 39.0 (1.54) 44.0 (1.73) 24.0 (0.94) 40.5 (1.59) 24.5 (0.96) 24.0 (0.94) 24 (0.94) LP- LP+ V- V+ -5V TEST IN LO IN HI COM N.C. REF LO REF HI XDP DP1 DP2 DP3LASCAR 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. LP- Negative power supply to LED backlighting. 2. LP+ Positive power supply to LED backlighting. 3. V- Negative power supply connection. 4. V+ Positive power supply connection. 5. -5V Output from negative rail generator circuit. This output is an inversion of V+ (DPM 950S only). 6. TEST Connect to V+ to display all segments except DPs. 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. 7. IN LO Negative measuring differential input. Analogue inputs must be no closer than 1V to either positive or negative supply. The negative 8. IN HI Positive measuring differential input. supply of the DPM 950S is generated internally and mirrors the positive supply voltage. 9. COM Ground for the analogue section of the A/D converter, it is actively held at approximately 2.8V below V+ and must not be allowed to sink excessive current (>100m A) by, for instance, connecting to a higher voltage. 11. REF LO Negative input for reference voltage. Can be connected to COM via link 3. 12. REF HI Positive input for reference voltage. Connected via link 1 to internal reference. 13. XDP Annunciator Drive Waveform, this is an inversion of the backplane. 14. DP1 199.9 15. DP2 19.99 Connect to V+ to display required Decimal Point or short corresponding DP link. 16. DP3 1.999 18 & 32. BP LCD backplane drive waveform. 23. REF- Negative output from internal reference. 24. REF+ Positive output from internal reference. 25. LO BAT Used to control the low battery annunciator externally, cut link 12 and take to V+ to turn on annunciator. The annunciator turn on point can also be set by adjusting the BAT potentiometer (R10), in which case do Only Pins 1-16 are fitted, not connect to this pin and leave link 12 intact. these functions are 26. REF BG Output from internal bandgap reference. (Factory fitted option.) available but a connector 27. Alarm annunciator, cut link ALM and take to XDP to display. is not provided. 28. : Colon annunciator, cut link COL and take to XDP to display. 29. - Polarity annunciator, connected via link 11 to polarity output of IC1. Cut link 11 and either take to XDP to display or make other side of link 11 to hold off. 30. POL Polarity output of IC1. 31. CLK May be used to override the internal oscillator and control the sample rate. Link 14 must then be made. 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 Normally ON-BOARD LINKS: In order to quickly and easily change operating modes for different applications, SHORTED OPEN Cut to Solder to the meter has several on-board links. They are designed to be easily opened (cut) 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+ 4 4 4 V+ V+ V+ 8 8 + + IN HI IN HI 8 14V max + IN HI 200mV 200mV 7 7 7V min IN LO 200mV - IN LO - 7 - IN LO 0V V- V- V- 3 3 3 1V min 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 rail supply (DPM 950) Measuring a single ended input of 200mV full scale. referenced to supply (DPM 950S). V+ V+ 4 V+ 4 V+ 4 8 IIN + V+ IN HI V+ 8 V1 8 IN HI 7 IN HI - IN LO 220k R 12 REF HI 7 + 6R2 Set 7 IN LO 5k V2 IN LO 11 REF LO Zero 0.2 - 9 R= COM V- IFSR V- IOUT V- 3 V- 3 3 V- V- Check Links 1 & 4 are OPEN. Check Links 2 & 3 are SHORTED. Check Link 3 is SHORTED. Measuring the ratio of two voltages. Measuring current. Supply MUST Measuring 4-20mA to read 0-999 Reading = 1000 V /V 12 be isolated. (supply MUST be isolated). 50mV <VV<200mV<2V 212. Specifications liable to change without prior warning DPM 950 Issue 8 August/2002 M.C. Applies to DPM 950/4