DPM 950S-EB-W 3 Digit LCD Voltmeter The DPM 950S-EB-W features an enhanced black LCD and 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user selectable. The DPM 950S-EB-W features a negative rail generator which enables the meter to measure a signal referenced to its own power supply GND. Enhanced contrast negative mode LCD with white LED backlighting ensures excellent readability under all light conditions. 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.) Enhanced black LCD with LED Backlight Single Rail 5V d.c. Supply Alarm Annunciator Stock Number Standard Meter DPM 950S-EB-W SCALING IP67 / NEMA 4X Bezel BEZ 900-IP Two resistors Ra and Rb may be fitted in order to alter the Specification Min. Typ. Max. Unit full scale reading (F.S.R.) of the meter - see table. The meter will need re-calibration. Accuracy (overall error)* 0.05 0.1 % (1 count) Linearity 1 count Required F.S.R. Ra Rb Sample rate 3 samples/sec 2V Note 910k 100k Operating temperature range 0 50 C 20V Note 1M 10k Temperature stability 100 ppm/C 200V Note 1M 1k Supply voltage 4.75 5 7.5** V 2kV Note 1M 100R Supply current Display on 50 90 mA 200 A LINK 1k Display disabled 500 A 2mA LINK 100R Input leakage current (Vin = 0V) 1 10 pA 20mA LINK 10R * To ensure maximum accuracy, re-calibrate periodically. 200mA LINK 1R ** Operation of the meter beyond the maximum supply voltage may cause permanent damage to the meter. *** An external series resistor is required above 5V, see Applications. NOTE This specification linearly derates to 50mA 50C 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) Panel cut-out 72 x 40 (2.83 x 1.57) Maximum panel thickness 3mm (0.12). 76.0 (2.99) a 72.5 (2.85) 51 (2.01) Display in Test Mode REAR VIEW a. 1.0 (0.04) b. 2.0 (0.08) c. 6.5 (0.26) d. 11.5 (0.45) 51.0 (2.01) e. 8.4 (0.33)* b c *typical depth of tallest component behind PCB, this dimension is for guidance only. 61.5 (2.42) d e 51.0 (2.01) 5.7 (0.22) 11 2341 ON BOARD SOLDER LINKS Ra 12 Rb 10 SCALING RESISTORS REAR DP2 VIEW DP3 DP1 3.0 71.5 (2.81) (0.12) Specifications liable to change without prior warning DPM 950S-EB-W Issue 2 01/2012 S.L. 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) 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. LP- Negative power supply to LED backlighting. Connect to 0V (Pin 3) 2. LP+ Positive power supply to LED backlighting. +5V connect to V+ for 5V supply, or via external resistor if V+ is above 5V. See Applications. 3. V- Negative power supply connection. 0V. 4. V+ Positive power supply connection. (+5V nom) 5. -5V N.C. (Output from negative rail generator circuit. This output is an inversion of V+). 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 (>100 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, the meter has SHORTED OPEN several on-board links. They are designed to be easily opened (cut) or shorted (soldered). Cut to Solder to 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+ +4.75 to +7.5V +4.75 to +7.5V 4 4 V+ V+ 8 R= V+ - 5V 8 R= V+ - 5V BL BL + IN HI + IN HI 50mA 50mA 200mV 200mV LP+ LP+ 7 7 2 2 - IN LO - IN LO Measuring a floating voltage source of Measuring a single ended 200mV full scale. input referenced to supply. LP- LP- V- V- 3 1 3 1 V- 0V V- 0V Check Links 2 & 3 are SHORTED. Check Link 3 is SHORTED. +4.75 to +7.5V V+ 4 V+ Switch to disable display +4.75 to +7.5V V+ V+ 8 4 IIN to reduce current + 4 IN HI V+ 8 V1 V+ 7 IN HI - IN LO 8 R= V+ - 5V 220k BL IN HI 50mA R= V+ - 5V R= V+ - 5V BL BL 12 LP+ 50mA R 50mA REF HI + 6R2 Set 7 2 5k 7 LP+ V2 IN LO 11 IN LO 2 REF LO Zero LP+ - 9 2 COM LP- V- 0.2 R= IOUT LP- V- IFSR 3 1 V- LP- V- 3 1 V- 3 1 Check Links 1 & 4 are OPEN. V- 0V Check Link 3 is SHORTED. Measuring the ratio of two voltages. Check Links 2 & 3 are SHORTED. Measuring 4-20mA to read 0-999 Reading = 1000 V /V Measuring current. Supply MUST be isolated. (supply MUST be isolated). 50mV < V <200mV V < 2V Specifications liable to change without prior warning DPM 950S-EB-W Issue 2 01/2012 S.L.