DPM 2000 3 Digit LCD Module The DPM 2000 uses advanced components and construction techniques to provide an unrivalled combination of high performance, elegant appearance and low cost. The module uses a bandgap reference for extra temperature stability. For single rail operation, the DPM 2000S features a built-in negative rail generator, enabling the meter to measure a signal referenced to its own power supply 0V. 15mm (0.6) Digit Height Programmable Decimal Points Auto-zero Auto-polarity 200mV d.c. Full Scale Reading (F.S.R.) Single Rail Version SCALING Two resistors Ra and Rb may be fitted in order to alter Stock Number the full scale reading (F.S.R) of the meter - see table. Standard Meter DPM 2000 The meter will need re-calibration. Single Rail Version DPM 2000S Required F.S.R. Ra Rb Specification Min. Typ. Max. Unit 2V Note 910k 100k Accuracy (overall error) * 0.05 0.1 % (1 count) Linearity 1 count 20V Note 1M 10k 200V Note 1M 1k Sample rate 3 samples/sec 2kV Note 1M 100R Operating temperature range 0 50 C Temperature stability 30 ppm/C 200m A link 1k 2mA link 100R Supply voltage DPM 2000 7.5 9 14 V (V+ to V-) DPM 2000S 3.5 5 6.5 20mA link 10R Supply current DPM 2000 150 200mA link 1R m A DPM 2000S 500 NOTE Input leakage current (Vin = 0V) 1 10 pA Ensure that link 10 is open if fitting Ra. * 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). DIMENSIONS All dimensions in mm (inches) 72.0 (2.83) ab 6 ON BOARD 9 SOLDER LINKS H5 11 4 2 7 12 14 SCALING RESISTORS 8 1 3 5 Rb 13 Ra 10 Display in TEST mode 67.5 (2.66) cd e 2.50 60.0 (2.36) fg (0.10) m W LMP a. 1.00 (0.04) b. 9.00 (0.35) c. 1.25 (0.05) d. 5.50 (0.22) e. 4.00 (0.16) f. 0.50 (0.02) g. 2.54 (0.10) 53.0 (2.09) 62.5 (2.46) 32.5 (1.28) 27.5 (1.08) 36.0 (1.42) 19.0 (0.75) 29.5 (1.16) 29.5 (1.16) TEST + XB3 - XDP pH -5V CLK % XG3 V V+ g RBG F REF- C REF+ A m E3 BP AB M POL K REF HI DP1 REF LO DP2 COM DP3 IL ~ : IH - V-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. V- Negative power supply connection. 2. IH Positive measuring input. Analogue inputs must be no closer than 1V to either the positive or negative supply. The negative 3. IL Negative measuring input. supply of an S-type meter is generated internally and mirrors the positive supply voltage. 4. 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. 5. REF LO Negative input for reference voltage. 6. REF HI Positive input for reference voltage (connected via Link 1 to REF+). 7. POL Drive for negative (-) annunciator. Internally connected via Link 11 to the annunciator. 8, 10, 15, 19 Outputs for autoranging applications. 9. BP LCD back plane drive waveform. 11. REF+ Positive output from internal reference (connected via Link 1 to REF HI). 12. REF- Negative output from internal reference. MUST be tied to a suitable ground return to bias bandgap (normally COM). 13. R BG Ouput of bandgap reference (1.22V nom). 14. V+ Positive power supply connection. 16. CLOCK Clock output. May be used for systems timing or as an input to override the internal oscillator and control the sample rate. 17. -5V Output from negative rail generator circuit (DPM 2000S only). This is an inversion of V+. 18. XDP Connect to required annunciators/DPs (see Special Note - Annunciators). 20. TEST Connect to V+ to momentarily turn on 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 5V (nom) 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. SPECIAL NOTE - ANNUNCIATORS. RIGHT WRONG The DPM annunciators (DPs, C, etc.) can be displayed either by connecting to XDP ANNUNCIATOR ANNUNCIATOR ANNUNCIATOR ANNUNCIATOR or by applying a solder blob link to the XDP pads located under the annunciator input pads. However, as these annunciators are normally floating , under certain conditions BP BP they may appear when not wanted. To suppress unwanted annunciators, apply a solder blob to the backplane pads located in-between the annunciator input pads. XDP XDP XDP XDP If the annunciators are being switched, connect them via MW resistor to the BP (Pin 9), the annunciators will then operate normally when connected to XDP. Ensure Do not link BP & XDP Link either BP or XDP that an annunciator is not connected directly to the XDP and BP at the same time. to the annunciator to annunciator. at the same time Note - if suppressing POL (-) annunciator by direct connection to BP then Link 11 MUST be cut first. VARIOUS OPERATING MODES ON-BOARD LINKS: In order to quickly and easily change operating modes for different Normally Normally SHORTED OPEN applications, the meter has several on-board links. They are designed to be easily opened Cut to Solder to (cut) or shorted (soldered). Do not connect more than one meter to the same power supply OPEN SHORT if the meters cannot use the same signal ground. Taking any input beyond the power supply rails will damage the meter. V+ V+ V+ 14 14 14 V+ V+ V+ 2 2 + IN HI + IN HI 2 200mV 200mV 3 + IN HI 3 14V max. - IN LO - IN LO 200mV 3 7V min. IN LO - 0V V- V- V- 1vmin. 1 1 1 V- V- V- Check Links 3 & 4 are SHORTED. Check Links 3 & 4 are SHORTED. Check Links 2,3&4are SHORTED. Measuring a floating voltage source of 200mV Split supply operation (DPM 2000). Measuring a single ended input full scale. referenced to supply (DPM 2000S). V+ V+ V+ 14 14 14 IIN V+ V+ V+ 2 2 + IN HI IN HI 13 2 V1 REF BG 3 IN HI - 100K IN LO R 3 6R2 SET 6 3 IN LO + REF HI 5K IN LO ZERO V2 4 5 0.2 REF LO COM - R= IFSR V- V- V- 1 1 1 IOUT V- V- V- Check Link 1 is OPEN. Check Links 3 & 4 are SHORTED. Check Links 2,3&4are SHORTED. Measuring the ratio of two voltages. Measuring 4-20mA to read 0-999 Measuring current (supply MUST 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 2000 Issue 4 August/2002 M.C. Applies to DPM 2000/5