+SEG POL GND V+ VNEG TEST IN HI IN LO COM NC REF LO REF HI DP COM DP1 DP2 DP3 DPM 959B 3 Digit LED Voltmeter No.:695 - Page 1 of 2 This compact voltmeter is ideally suited to applications where excellent readability under all lighting conditions is required. The meter is fitted with high efficiency LEDs which, together with the integral red filter, give a high contrast display with 19mm (0.75 ) digit height. The meter can be easily scaled by the user to indicate volts, amps or other engineering units and may be used in single-ended, differential, ratiometric or floating input modes. 19mm (0.75) Digit Height Programmable Decimal Points Auto-zero Auto-polarity 200mV d.c. Full Scale Reading (F.S.R.) SCALING Two resistors Ra and Rb may be fitted on the module in order to alter the full scale reading (F.S.R.) of the meter - see table. The meter will need re-calibration by adjusting the calibration potentiometer. Stock Number Required F.S.R. Ra Rb Standard Meter DPM 959B 2V Note 910k 100k Specification Min. Typ. Max. Unit 20V Note 1M 10k Accuracy (overall error) * 0.1 % (1 count) 200V Note 1M 1k Linearity 1 count 2kV Note 1M 100R Sample rate 2.5 samples/sec 200 A LINK 1k Operating temperature range 0 50 C 2mA LINK 100R Warm-up time 10 minute 20mA LINK 10R Temperature stability 150 ppm/C 200mA LINK 1R Supply voltage (V+ to V-) 4.75 5 5.25 V NOTE Supply current 50 90 mA Ensure that solder link 10 across Ra is OPEN. Input leakage current (Vin = 0V) 1 10 pA * To ensure maximum accuracy, re-calibrate periodically. 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). Panel cut-out 72 x 40 (2.83 x 1.57) DIMENSIONS All dimensions in mm (inches) Maximum panel thickness 3mm (0.12) 76.0 (2.99) a 72.5 (2.85) REAR VIEW 1 16 a. 1.0 (0.04) b. 2.0 (0.08) c. 6.5 (0.26) d. 11.5 (0.45) e. 8.4 (0.33)* 51.0 (2.01) SCALING RESISTORS b c ON TOP SIDE OF BOARD 61.5 (2.42) ON-BOARD SOLDER LINKS d e 51.0 (2.01) 5.7 2.54 pin pitch (0.22) DE REAR 10 2 3 Rb VIEW 7 Ra 1 16 11 1 POL 3.0 71.5 (2.81) 12 (0.12) *typical depth of tallest component behind PCB, this dimension is for guidance only. Specifications liable to change without prior warning DPM 959B Issue 12 06/2010 S.L. Applies to DPM 959B/1 www.lascarelectronics.com 39.0 (1.54) 44.0 (1.73) 24.2 (0.95) 40.5 (1.59) 24.5 (0.96) 24.0 (0.94) DP3 DP2 DP1 2.54 pin pitch 21.5LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. LASCAR ELECTRONICS (HK) LTD. MODULE HOUSE, 4258 WEST 12th STREET, 8th FLOOR, CHINA AEROSPACE CENTRE, WHITEPARISH, ERIE, 143 HOI BUN ROAD, WILTSHIRE SP5 2SJ, PA 16505, KWUN TONG, KOWLOON, UK USA HONG KONG TEL: +44 (1794) 884567 TEL: +1 (814) 835 0621 TEL: +852 2389 6502 FAX: +44 (1794) 884616 FAX: +1 (814) 838 8141 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. +SEG Use to indicate positive polarity- seeVARIOUS OPERATING MODE for details. 2. POL To completely disable the negative polarity sign, cut solder link POL. 3. GND Negative power supply connection (0V). 4. V+ Positive power supply connection (+5V). 5. V NEG Output from negative rail generator (-5V nom). This is an inversion of V+. 6. TEST When taken to V+ all segments, except decimal points, should light i.e.1888 . 7. IN LO Negative measuring input. Analogue inputs must be no closer than 1.5V to the positive or negative supply. 8. IN HI Positive measuring input. The negative supply is generated internally and mirrors the positive supply voltage. 9. COM Ground for analogue section of the A/D converter, it is actively held at 3.05V below V+ and must not be allowed to sink excessive current (>100 A) by, for instance, connecting to a higher voltage. 10. NC Do not connect. 11. REF LO Negative input for reference voltage. (Connected via Link 3 to COM.) 12. REF HI Positive input for reference voltage. (Connected via Link 1 to internal reference.) 13. DP COM Connect to Pins 14, 15 or 16 to illuminate the required decimal point, alternatively use the on-board solder links DP1, 2 or 3. 14. DP1 Connect to Pin 13 to display DP1 (199.9). 15. DP2 Connect to Pin 13 to display DP2 (19.99). 16. DP3 Connect to Pin 13 to display DP3 (1.999). SOLDER LINKS 1. Normally closed. Open this link to disable the internal reference. Then apply an external reference to REF HI (pin 12). 2. Normally open. Close this link to connect IN LO (pin 7) to COM (pin 9). 3. Normally closed. Open this link to disconnect COM (pin 9) from REF LO (pin 11). 7. Normally open. Close this link connect IN LO (pin 7) to GND (pin 3). 10. Normally closed. Open this link when fitting scaling resistor Ra. DP1-2-3. Normally open. Close one of these links to display decimal points DP1 (199.9), DP2 (19.99) or DP3 (1.999) respectively. POL. Normally closed. Open this link to disable the polarity sign. See Pin Functions 1 and 2 above. VARIOUS OPERATING MODES ON-BOARD SOLDER LINKS: In order to quickly and easily change operating modes for different applications the meter has several on-board solder links. Normally Normally SHORTED OPEN They are designed to be easily opened (cut) or shorted (soldered). Do not connect Cut to Solder to more than one meter to the same power supply if the meters cannot use the same OPEN SHORT signal ground. Taking any input beyond the power supply rails will damage the meter. +4.75 to +5.25V +4.75 to +5.25V +4.75 to +5.25V IIN 4 4 4 V+ V+ V+ 8 IN HI 8 220k 8 + IN HI + Input IN HI INPUT Voltage 7 6R2 IN LO 7 - VOLTAGE - IN LO Set 7 5k IN LO Zero 9 COM GND GND GND IOUT 3 3 3 0V 0V 0V Check solder link 2 is OPEN. Check solder link 2 is SHORTED. Check solder link 2 is OPEN. Operation with input referenced to panel Measuring 4-20mA to read 0-999 Operation with input floating meter supply (Single ended mode). (supply MUST be isolated). with respect to power supply. Preferably link IN LO to GND at signal source (to reduce loop noise), otherwise make link 7. +4.75 to +5.25V +SEG (Pin 4) (Pin 1) +4.75 to +5.25V +4.75 to +5.25V 4 4 10K BC307 V+ V+ 8 8 POL + IN HI BC307 IN HI V (Pin 2) 1 7 R - IN LO 7 IN LO 10K 12 + REF HI 0.2 1K0 R= V 1K5 2 11 IFSR - REF LO GND GND 0V 3 3 (Pin 3) 0V 0V Check solder links 1 & 3 are OPEN. Check solder links 2 & 3 are SHORTED. The above circuit can be used to Measuring current. Measuring the ratio of two voltages. indicate both positive and negative Supply MUST be isolated. Reading = 1000 V12/V polarity, by illuminating either the 50mV< V2<200mV + or - segment on the meter. V12<2V . Specifications liable to change without prior warning DPM 959B Issue 12 06/2010 S.L. Applies to DPM 959B/1