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| DPM 2 8.25mm (0.32") Digit Height Programmable Decimal Points Auto-zero Auto-polarity 200mV d.c. Full Scale Reading (F.S.R.) 31/2 Digit Subminiature LCD Module The DPM 2 uses the latest miniaturisation techniques to produce a very compact meter. The snap-in integral bezel makes installation easy. For single rail use, the DPM 2S features a built in negative rail generator, enabling the meter to measure a signal referenced to its own power supply 0V . SCALING A potential divider may be used to alter the full scale reading (F.S.R.) of the meter - see table. NOTES The meter will have to be re-calibrated by adjusting the calibration potentiometer at the rear of the module. + Ra INPUT Rb 1M Standard Meter Single Rail Version Accuracy (overall error) * Linearity Sample rate Operating temperature range Temperature stability DPM 2 DPM 2S Supply voltage DPM 2 DPM 2S Supply current DPM 2 DPM 2S Input leakage current (Vin= 0V) Stock Number Min. Typ. 0.1 3 200 100 9 5 150 250 1 DPM 2 DPM 2S Specification Max. 1 50 14 7 10 3 10nF IN HI - 2 IN LO 0 7 3 % (1 count) count samples/sec C ppm/C V A pA Unit Required F.S.R. 2V 20V 200V 2kV 200A 2mA 20mA 200mA Note 910k 1M 1M 10M 0R 0R 0R 0R Ra 100k 10k 1k 1k 1k 100R 10R 1R Rb * To ensure maximum accuracy, re-calibrate periodically. CONNECTOR SOURCING GUIDE METHOD NOTE Ensure that Ra is rated for high voltage use. SUPPLIED WITH PRODUCT DIMENSIONS All dimensions in mm (inches) 35.0 (1.38) 22.3 (0.88) 17.0 (0.67) 9.70 (0.38) a b cd a. b. c. d. e. f. g. h. 2.00 6.00 1.60 6.00 2.00 0.50 7.26 1.76 (0.08) (0.23) (0.06) max (0.23) (0.08) (0.02) (0.28) (0.07) Panel cut-out 33.0 x 15.0 (1.30 x 0.60) Panel thickness 1.0 to 2.5 (0.04 to 0.1) ON BOARD SOLDER LINKS 32.5 (1.27) 14.5 (0.57) DP1 V+ GND CAP+ CAPREF HI REF LO COM IN HI IN LO V- DP2 DP3 REF 10 1 h g 10 1 e f PANEL FITTING Locate the meter by passing it through the front of the panel cut-out and gently push until the rear of the bezel is flush with the panel (DO NOT PUSH ON THE LCD). The snap-in lugs will now automatically hold the meter firmly in position. P.O. Box 897, Windham, NH 03087 (603) 893-0886 (800) 821-0023 FAX (603) 898-6820 PIN FUNCTIONS 1. V2. 3. 4. 5. 6. 7. 8. 9. 10. DPM 2 - negative power supply connection. DPM2S - C2 negative connection. IN LO Negative measuring input. Analogue inputs must be no closer than 1V to either the positive or negative supply. IN HI Positive measuring input. The negative supply of the DPM 2S is generated internally and mirrors the positive supply voltage. COM Ground for analogue section of A/D converter, it is actively held at 2.8V below V+ and must not be allowed to sink excessive current (>100A) by, for instance, connecting to a higher voltage. REF LO Negative input for reference voltage. REF HI Positive input for reference voltage (connected via Link REF to internal reference). CAPCharge pump capacitor connections (DPM 2S only). CAP+ GND DPM 2 - no connection. DPM 2S - 0V power supply connection. V+ Positive power supply connection. On board links can be made with a solder link to implement features. DP1 Make to turn on DP1 (199.9). DP2 Make to turn on DP2 (19.99). DP3 Make to turn on DP3 (1.999). REF Factory made - Connects internal reference to REF HI. It should only be cut if an external reference is used. ON BOARD LINKS SAFETY To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module's 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 user's equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and Laboratory Use). VARIOUS OPERATING MODES ON-BOARD LINKS: In order to quickly and easily change operating modes for different applications the meter has several "on-board links". They are designed to be easily opened (cut) or shorted (soldered). Do not connect more than one meter to the same power supply if the meters cannot use the same signal ground. Input filter should be as close as possible to the meter. Taking any input beyond the power supply rails will damage the meter. 1M 10nF Normally SHORTED Cut to OPEN Normally OPEN Solder to SHORT V+ +5V 10 V+ 3 IN HI 7 CAP2 IN LO 8 CAP+ 4 1 COM V5 REF LO GND 9 200mV + - 10 V+ 3 IN HI 2 4 5 IN LO V+ 200mV + - 1M 10nF 10 V+ 3 IN HI 2 4 5 IN LO V+ 200mV 14V max. 7V min. + - 1M 10nF - C1 + 1.5F COM REF LO V1 0V 1V min. COM REF LO V1 C2 + 1.5F 0V VCheck Link REF is SHORTED. Check Link REF is SHORTED. Check Link REF is SHORTED. Measuring a floating voltage source of 200mV full scale (DPM 2). 10 V+ 3 IN HI 4 IN LO 5 R= 0.2 IFSR V+ Split supply operation (DPM 2). V+ Measuring a single ended input referenced to supply (DPM 2S). Iin 1M 220k 10nF 5k R V1 V2 + + 1M 10nF 10 V+ 3 IN HI 2 6 5 IN LO 10 V+ 3 IN HI 2 IN LO 4 COM 5 REF LO V1 V+ 6R2 REF LO V1 REF HI REF LO V1 Iout - VCheck Link REF is SHORTED. VCheck Link REF is OPEN. V- Check Link REF is SHORTED. Measuring current. Supply MUST be isolated. (DPM 2) Measuring the ratio of two voltages. Reading = 1000 V1/V2 50mV< V2<200mV V1<2V2. (DPM 2) DPM 2 Issue 5 August/1997 Measuring 4-20mA to read 0-999. Supply MUST be isolated. (DPM 2) Specifications liable to change without prior warning M.C. Applies to DPM 2/1 |
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