DPM 970 Digital AC Voltmeter Module A 3 digit LCD panel meter, featuring 19mm (0.75) digit height and LED backlighting, the DPM 970 is a true RMS voltage and current meter with 2 500V a.c. (2kV ) and 2mA full scale readings as standard. By changing the value of scaling resistors or adding a shunt, this module will measure most a.c. voltages and currents. The DPM 970 features digital hold function which freezes the last displayed reading. Calibration is achieved via two multi-turn potentiometers for offset and scale. Connection to the meter is via screw terminals. The module is housed in a robust carrier which can be bolted in place or panel mounted using the bezel, window and clips provided. 19mm (0.75) Digit Height Screw Terminal Connections Digital Hold 2 500V a.c. (2kV ) Full Scale Reading Measures Voltage and Current LED Backlighting SCALING 1111 To change the full scale reading (F.S.R) of the meter, use the resistor values and PL10 configuration as detailed in the table below. To ensure that the meter reads000 with zero input voltage/current, short circuit ACV and COM and adjust the ZERO potentiometer. The meter will need recalibration by adjusting the CAL potentiometer. Option 1 = Make PL10 pins 2 & 3 Stock Number Option 2 = Make PL10 pins 1 & 2 Standard Meter DPM 970 Required F.S.R RA1 RA2 RB1 PL10 Specification Min. Typ. Max. Unit Accuracy (overall error) * 0.5 1.5 % (2 count) 200mV 0R 0R Not Fitted Option 1 Full scale reading ** 0 1999 VRMS 2V 390k 220k 330k Option 2 Resolution 1 VRMS 20V 680k 390k 39k Option 2 200V 560k 560k 3k9 Option 2 Sample rate 3 samples/sec 2kV (factory default) 560k 560k 390R Option 2 Operating temperature range 0 50 C 2mA - - 100R Option 1 20mA - - 10R Option 1 Temperature stability 200 ppm/C 200mA - - 1R Option 1 Frequency range (input voltage) 15 15k Hz 2A - - 0R1 Option 1 Input impedance (2kV range) 1 M 20A - - 0R01 Option 1 DC Supply voltage 7.5 9 14 V d.c. NOTES Supply current (Backlighting off) 1.5 mA d.c. 1 Use inputs ACV and COM for measuring voltage. Supply current (Backlighting on) 5Vd.c. 50 mA d.c. 2 For measuring voltages above 500V , external scaling resistor must be used. 3 Use inputs ACI and COM for measuring current. * To ensure maximum accuracy, re-calibrate periodically. 4 When measuring in excess of 200mA use an external scaling resistor fitted Between the terminals of ACI and COM. We recommend the use of a current ** Maximum safe input voltage across the ACV and COM terminals is 500VRMS. transformer when measuring in excess of 10 Amps. If voltages to be measured exceed 500VRMS, then fit scaling resistors externally to the module. Consult the current transformer manufacturers data for connections and recommendations. Other scaling factors can be achieved via the correct selection of scaling resistor values. 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) 51 (2.01) a. 1.0 (0.04) Display in Test Mode b. 2.0 (0.08) c. 6.5 (0.26) d. 11.5 (0.45) e. 12.5 (0.49)* 51.0 (2.01) b c *typical depth of tallest component behind PCB, this dimension is for guidance only. 61.5 (2.42) de 51.0 (2.01) 5.7 (0.22) 3.0 71.5 (2.81) (0.12) Specifications liable to change without prior warning DPM 970 Issue 12 06/2010 S.L. Applies to DPM 970/12 www.lascarelectronics.com 39.0 (1.54) 44.0 (1.73) 24.0 (0.94) 40.5 (1.59) 24.5 (0.96) 24.0 (0.94) 24 (0.94)LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. MODULE HOUSE, WHITEPARISH, LASCAR ELECTRONICS (HK) LTD. WILTSHIRE SP5 2SJ 4258 WEST 12th STREET, 8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN UK ERIE, PA 16505 USA ROAD, KWUN TONG, KOWLOON, HONG KONG TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141 TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616 TEL: +852 2389 6502 FAX: +852 2389 6535 E-mail: sales lascar.co.uk E-mail: us-sales lascarelectronics.com E-mail: saleshk lascar.com.hk SCREW TERMINAL FUNCTIONS ACV Alternating voltage measurement input, accepts up to 500V a.c. By changing the values of scaling resistors RA1, RA2 and RB1, other voltage and current ranges can be achieved. To measure in excess of 500V a.c., remove RA1, RA2 and RB1 from the meter and fit an external divider that will output 700mV for a 2kV input, e.g. series resistor 1.12 M shunt resistor 390R, link RA1 and RA2 on the meter. See scaling table for suitable values for RA1, RA2 and RB1. ACI Alternating current measurement input. See Scaling table for suitable values for shunt resistor RB1. COM Return line for voltage measurement input (ACV) or current measurement (ACI) input. COM Return line for voltage measurement input (ACV) or current measurement (ACI) input. V+ Positive power supply input. V- Negative power supply input. LP- Negative supply for LED backlighting. LP+ Positive supply for LED backlighting. TST Connect to V+ to display all segments except decimal points and annunciators. It should not be operated for more than a few seconds as the DC voltage applied to the LCD may burn the display. This connection is normally at 5V below V+ 1111 and is the ground for the digital section of the meter. HLD Digital Hold option. Connect to V+ to hold last displayed reading indefinitely. ALM Alarm annunciator. Connect to XDP to display. XDP Annunciator drive waveform. Used to drive alarm annunciator (ALM) if required. V+ Auxilliary V+ for connections to decimal points DP1, DP2 or DP3. DP1 199.9 Connect to V+ to display required decimal point. DP2 19.99 Connect to V+ to display required decimal point. DP3 1.999 Connect to V+ to display required decimal point. SAFETY WARNING To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the modules connectors must not exceed 500VRMS. If voltages to be measured exceed 500VRMS, then fit scaling resistors externally to the module. If the mains power supply is connected to the module, then all the modules connectors must be considered to be floating at mains potential. Consequently due caution must be exercised when connecting to the modules connector functions under these conditions. 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). Phase APPLICATIONS LP+ 110/240V V+ +5V COM WARNING : Do not apply in excess of 500V a.c. to the meter. PSU 303 V- -5V LP- 0V Neutral Voltage V+ Powering the LED backlighting on a DPM 970 ACV Phase 1 from the PSU 303 s +5V and COM outputs. COM V- 110/240V +5V Current V+ ACI Load PSU 303 -5V COM V- 0V Voltage V+ ACV Phase COM V- Voltage V+ ACV 110/240V Phase 2 +5V Current V+ ACI COM Load PSU 303 V- -5V COM 110/240V V- 0V +5V Current V+ ACI Load PSU 303 Neutral -5V COM V- 0V Single Phase Current and Voltage Measurement Voltage V+ ACV Phase 3 COM V- ACI 110/240V Load V+ +5V 110/240V Phase +5V Current V+ PSU 303 ACI Load V- -5V PSU 303 -5V CT Neutral COM 0V COM V- 0V Neutral 3-Phase Current and Voltage Using a current transformer (CT) to Measurement measure currents in excess of 10A a.c. Specifications liable to change without prior warning DPM 970 Issue 12 06/2010 S.L. Applies to DPM 970/12