DPM 500S 3 Digit LCD Module The DPM 500S uses advanced components and construction techniques to provide a uniquely compact unit. The meter is in a 40 pin DIL integrated circuit format that can be plugged directly into a DIL socket or panel mounted using the snap in bezel. For single rail use, the DPM 500S features a built in negative rail generator, enabling the meter to measure a signal referenced to its own power supply 0V. 12.5mm (0.5) Digit Height Programmable Decimal Points CF + - Auto-zero m A mV kW Auto-polarity MHz 200mV d.c. Full Scale Reading (F.S.R.) Annunciators Stock Number SCALING Single Rail Version DPM 500S 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. Accuracy (overall error)* 0.05 0.1 % (1 count) Meter will need re-calibration. Linearity 1 count Required F.S.R. Ra Rb Sample rate 3 sample/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 3.5 5 6.5 V 2kV Note 1M 100R Supply current 250 m A 200m A 0R 1k Input leakage current (Vin = 0V) 1 10 pA 2mA 0R 100R * To ensure maximum accuracy, re-calibrate periodically. 20mA 0R 10R 200mA 0R 1R NOTE CONNECTOR SOURCING GUIDE Ensure link 10 is cut if fitting Ra. METHOD 40 Pin DIL IC Socket 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). DIMENSIONS All dimensions in mm (inches) PANEL FITTING Fit the bezel to the front of the panel 1.18.2 and locate the meter into the bezel (0.04)(0.32) 60.0 (2.36) from behind. Alternatively the meter and bezel may be assembled before 45.0 (1.77) fitting to 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. Display in TEST mode 6.7 (0.26) 4.0 (0.16) 52 (2.05) 9 11 1 7 12 20 m 1 7 12 20 5 ON-BOARD LINKS 8 13 12 3 15 2 10 4 14 OPTIONAL SCALING 1 Rb Ra RESISTORS 40 21 W 21 40 7 1.87 0.5 2.54 4.80 (0.19) REAR VIEW (0.07) (0.02) (0.1) Panel cut-out = 57 x 27 (2.24 x 1.06) www.lascarelectronics.com 30.0 (1.18) V+ V+ V m Hz A TEST REF F HI REF C LO REF+ REF- COM IN HI IN LO M BG K -5V ~ XDP - V- XB3 DP1 : DP2 E3 DP3 AB XG3 POL BP 15.2 (0.60) 24.8 (0.98) 16.0 (0.63)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, 40. V+ Positive power supply. 2 -7, 12-14, 17, 38, 39 See SPECIAL NOTE: ANNUNCIATORS. 15. - Input for the polarity annunciator. Internally linked to POL (pin 20). If this is to be externally controlled, cut link 11. 16, 18, 19, 22 XB3, E3, AB, XG3. Outputs for use in auto-ranging applications. 20. POL Drive for annunciator. Internally connected by link 11. 21. BP LCD backplane drive waveform. 23. DP3 1.999 24. DP2 19.99 See SPECIAL NOTE: ANNUNCIATORS. 25. DP1 199.9 26. V- Negative power supply. Note that the voltage between V+ and V- must not exceed 6.5V. 27. XDP Connect to required annunciators/DPs (see note). 28. -5V Output from negative rail generator circuit. This output is an inversion of V+. 29. BG Input for bandgap reference. (1.22V nom). 30. IN LO Negative measuring input. Analogue inputs must be no closer than 1V to either the positive or negative supply. The negative 31. IN HI Positive measuring input. supply of the DPM 500S is generated internally and mirrors the positive supply voltage. 32. 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. 33. REF- Negative output from internal reference. 34. REF+ Positive output from internal reference. 35. REF LO Negative input for reference voltage. 36. REF HI Positive input for reference voltage. 37. TEST Connecting this pin to V+ turns on the segments as illustrated. It should not be operated for more than a few seconds as the DC voltage applied to the LCD maybur the display. This pin is nominally at 5V below V+ and is the ground for the digital section of the meter, it can be used as a negative supply to power external logic up to a maximum of 1mA. 40. V+/CLK Normally tied to V+ via Link 12 but can be used to over ride the internal oscillator and control the sample rate by cutting Link 12 and making Link 13. The DPM annunciators (DPs, C, etc.) can be displayed by connecting them to XDP. However as these SPECIAL NOTE: ANNUNCIATORS: annunciators are normally floating, under certain conditions they may appear when not wanted. To suppress unwanted annunciators, link them to the backplane (BP). If the annunciators are being switched, connect them via a 1M resistor to the BP (pin 21). The annunciators will then operate normally when connected to XDP. Ensure that an annunciator is not connected directly to the XDP and BP at the same time. VARIOUS OPERATING MODES ON-BOARD LINKS: In order to quickly and easily change operating modes for Normally Normally SHORTED different applications, the meter has severalon-board link. They are designed to be OPEN Cut to Solder to easily opened(cut) or shorted (soldered). Do not connect more than one meter to the OPEN SHORT 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+ 1 1 V+ V+ 31 31 + + IN HI IN HI 200mV 200mV 30 30 IN LO - - IN LO V- V- 26 26 0V V- Links 1, 2,3&4 SHORTED. Links 1,3&4 SHORTED. Measuring a floating voltage Measuring a single ended input source of 200mV full scale. referenced to supply. V+ V+ V+ IIN 1 1 1 V+ 31 V+ V+ 31 + 31 IN HI IN HI IN HI V1 30 - IN LO 220K R 30 6R2 36 30 + REF HI IN LO IN LO V2 5K 32 35 0.2 REF LO - COM R= IFSR V- V- V- 26 26 26 IOUT V- V- V- Links 1, 2, 3, 4 SHORTED. Links 1,3&4 SHORTED. Measuring current Measuring the ratio of two voltages. Measuring 4-20mA to read 0-999. Reading = 1000 V /V Supply MUST be isolated. 12 Supply must be isolated. 50mV< V2<200mV V12<2V . Specifications liable to change without prior warning DPM 500S Issue 6 August/2002 M.C. Applies to DPM 500/7