DPM 160 4 Digit LCD Module A DPM offering levels of performance, low current consumption and compact size never previously available. Automatic low battery indication and continuity flags are built into the display. Supplied complete with snap-in bezel, the DPM 160 will suit many applications calling for low cost, high accuracy measurements in portable instruments. 12.5mm (0.5) Digit Height. Programmable Decimal Points Auto-zero + - Auto-polarity 200mV d.c. or 2V d.c. Full Scale Reading (F.S.R.) Digital Hold Single Rail Version (DPM 160S) Autoranging Outputs Stock Number SCALING Standard Meter DPM 160 Two resistors Ra and Rb may be fitted in order to alter the Single Rail Version DPM 160S full scale reading (F.S.R.) of the meter - see table. Specification Min. Typ. Max. Unit The meter will need re-calibration. Accuracy (overall error) * 0.005 0.01 % (1 count) Required F.S.R. Range Input Ra Rb Linearity 1 count 200mV LOW (o/c) Link (o/c) Sample rate 1.6 samples/sec 2V HIGH Link (o/c) Operating temperature range 0 50** C Temperature stability 30 ppm/C 20V Note HIGH 910k 100k Supply voltage DPM 160 6 9 14 200V Note HIGH 1M 10k V (V+ to V-) DPM 160S 3 5 7 2kV Note HIGH 1M 1k Supply current 1 mA 200m A LOW(o/c) Link 1k Input leakage current (Vin= 0V) 1 10 pA 2mA LOW(o/c) Link 100R 20mA LOW(o/c) Link 10R * To ensure maximum accuracy, re-calibrate periodically. 200mA LOW(o/c) Link 1R **Above typically 35C the displays viewing angle will progressively reduce, although NOTE contrast should remain acceptable when viewed head-on. Ensure that Link La is open if fitting Ra. 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) 8.20 1.10 60.0 (2.36) (0.04) (0.32) Panel cut-out 57 x 27 (2.24 x 1.06) 6.7 8.00 (0.26) (0.33) 52.0 (2.05) REAR VIEW ON BOARD SOLDER LINKS SCALING RESISTORS Rb 1 Ra La 120 1 20 2 3 4 2.54 (0.10) 0.50 (0.02) 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. 30.0 (1.18) DP4/OR V DISP DP3/UR L/H V- V+ REF- REF BG REF+ COM CONT IN LO IN HI REF HI REF LO DGND RANGE DP2 DP1 CLOCK 25.0 (1.00)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 Note that HI means V+ (6) and LO means DGND (16). Four of the pins are input/output ,featuring weak WEAK OUTPUT outputs . To use it as an input, the output is easily over driven. In order to obtain the output data, the pin must be connected to a high impedance input. 1. DP4/OR Input: When pulled HI, DP 1.9999 will be shown. If DP4 is not to be used, connect it LO. DP4/OR (1) 500k DP3/UR (3) Output: The output will go HI if the result exceeds 19999. LATCH/HOLD (4) Note: If DP4 is to be shown and the O/R signal is to be sensed at the same time, Pin 1 should CONTINUITY (11) be used as an input under normal conditions except during L/H output when the O/R flag should be sensed. 2. VDISP This input sets the drive voltage for the display. It is internally linked to DGND. 3. DP3/UR Input: When pulled HI, DP 19.999 will be shown. If DP3 is not to be used, connect it LO. Output: The output will go HI if the result is less than 1000. Note: If DP3 is to be shown and the U/R signal is to be sensed at the same time, Pin 3 should be gated with the L/H as described below. 4. L/H Input: When floating, the converter operates in the free-run (normal) mode. When pulled HI, the last displayed reading is held. Output: A negative pulse occurs when the data in the display latches is updated. 5. V- Negative power supply. 6. V+ Positive power supply. 7. REF- Negative supply for the internal reference. 8. REF BG Output of the bandgap reference (1.22V nom). 9. REF+ Positive output from internal reference. 10. COM The ground for the analogue section of the A/D converter. Held actively at 3.2V (nom.) below V+. 11. CONT If the converter input voltage drops below a nominal 200mV, then the continuity annunciator will be shown and the output will be HI. To disable the continuity indicator, pin 11 should be held LO. 12. IN LO Negative differential measuring input. Inputs must be lower than 1.0V below V+, and higher than 1.5V above V-. 13. IN HI Positive differential measuring input. 14. REF HI Positive input for reference voltage. 15. REF LO Negative input for reference voltage. 16. DGND DGND is held at between 4.6 and 6 voltage below V+. This is the supply voltage for the digital section. If CMOS logic is used to provide or decode DPM 160 signals, then it can be powered from V+ and DGND up to a maximum of 1mA. 17. RANGE This pin has an internal 3mA pull down and need not be connected for a 200mV full scale. For 2V full scale connect HI. 18. DP2 Input for DP 199.99 These pins have an internal 3m A pull down and need not be connected if the decimal points are not to be 19. DP1 Input for DP 1999.9 shown. To show the points, connect to HI. 20. CLOCK This input can be used to override the internal clock in order to synchronise DPM 160 with external systems. VARIOUS OPERATING MODES ON-BOARD LINKS: In order to quickly and easily change operating modes for Normally Normally different applications the meter has several on-board links. They are designed SHORTED OPEN Cut to to be easily opened (cut) or shorted (soldered). Do not connect more than one meter Solder to OPEN SHORT 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+ V+ 6 6 6 V+ V+ V+ 13 + IN HI 13 13 + IN HI 200mV + IN HI 12 14V max - IN LO INPUT 7V min 12 12 VOLTAGE IN LO - IN LO INPUT VOLTAGE 0V V- 1.5V V- V- min. 5 5 5 V- V- V- Check Links 1, 2,3&4are SHORTED Check Links 1,3&4are SHORTED. Check Links 1,3&4are SHORTED. Measuring a floating voltage source Split supply operation (DPM 160). Measuring a single ended input of 200mV full scale. referenced to supply (DPM 160S). V+ V+ V+ 4013 + 6 6 6 4016 1 O/R V+ 13 V+ DP4 LATCH V+ 13 + CK O/P + IN HI IN HI O/R V1 12 IN LO U/R - DP3 -- R 3 DP4 I/P O/P LATCH U/R 14 4 CK + REF HI L/H 12 - IN LO V2 15 REF LO OPTIONAL - 0.2 PULSE DELAY V- V- R= V- DGND MONOSTABLE IFSR 5 5 DP3 I/P V- 5 16 V- V- Check Links 1, 2,3&4are SHORTED Check Link REF is SHORT. Measuring the ratio of two voltages. Driving DP3 and DP4 inputs while Measuring current. 5 Supply MUST be isolated. monitoring under range and over 200mV F.S.R. reading = 10 V /V 12 4 range outputs. 2V F.S.R. reading = 10 VV. 1/ 2 Specifications liable to change without prior warning DPM 160 Issue 7 May/2003 M.C. Applies to DPM 160/5