digital panel modules user guide DPM 8000 Series-2 Voltmeters and Ammeters Models covered by this instruction sheet DPM8100-2 3.5 DIGIT 200mV DC DPM8100A-2 3.5 DIGIT 2V DC DPM8120-2 3.5 DIGIT 200mV AC DPM8120A-2 3.5 DIGIT 2V AC DPM8140-2 3.5 DIGIT 200mV True RMS AC DPM8400-2 4.5 DIGIT 200mV DC DPM8400A-2 4.5 DIGIT 2V DC DPM8420-2 4.5 DIGIT 200mV AC DPM8420A-2 4.5 DIGIT 2V AC The DPM8100-2 and DPM8400-2 series can be ranged as voltmeters or ammeters by fitting multiplier or shunt resistors (not include into the labelled positions on the main printed circuit board as shown on the OPERATING SPECIFICATION diagram overleaf. Wire linkJP1 may need to be removed for some Accuracy: 81xx: +/- 0.1% of rdg +/-1 digit (AC models +/- 0.2%) voltmeter ranges. 84xx: +/- 0.01% of rdg +/-2 digits DC models Using close tolerance resistors, the minimum of recalibration is required. 84xx: +/- 0.1% of rdg +/-3 digits AC models For accurate setting a calibrated supply should be used. The resistors Line voltage: 115/ 230 volts +10, -20%, 50 - 60 Hz fitted should be adequately rated for the current or voltage range. Temperature: 0 - 50 degrees C For non standard ranging and calibration, application sheet No. AES040 is available on request. Humidity: below 85% RH Over range is indicated by -1 on the display for 3.5 digit meters and by Power: 4VA flashing zero s on the 4.5 digit meters. Sampling rate: 2.5 / second STEP BY STEP INSTRUCTIONS 1 Remove instrument from its protective plastic bag and clip off TERMINAL DEFINITIONS front cover. SYMBOL DESCRIPTION 2 Pull off the three green safety terminals from the rear of the IN HI 1 meter. The complete panel meter assembly can now be Apply input to pins 1 and 2. If INLO signal is removed from its case by carefully levering the base of the greater than INHI the display will read -ive. 2 IN LO LED display board over the plastic retaining lug while pushing 3 n/c Not connected (unused) gently on the terminal pins at the rear. 4 Gnd (sig) digital 0 Volts (NOT MAINS EARTH) 3 With reference to the Range Specification table and notes overleaf, determine the resistance values to be fitted for the HOLD connect to terminal 6 (+5V) 8100 series 5 required voltage or current range. Further note whether link (display) connect to terminal 4 (0V) 8400 seriesJP1 should be removed. 6 +5V (o/p) internal +5V output (maximum 50mA) Carefully de-solder and remove link JP1 if necessary and solder the required resistors in place as shown on the main 7 230V circuit board diagram. 8 115V AC mains supply 4 The decimal point should be set as required by either 0V (N) 9 repositioning the PCB jumper link JP2 on the 3.5 digit models or setting a dip switch on the front of the 4.5 digit model, in one of these locations:- DIMENSIONS DP1 gives 1.999 i.e XXX DP2 gives 19.99 i.e. X. XX DP3 gives 199.9 i.e XX. X DP4 gives 1999.9 i.e XXX. X on 4.5 digit version only. 5 Slide panel meter back into its case along the guide rails taking care to ease bottom of LED display board over protruding lug. Then push the green safety terminals securely back into place on the rear of the meter. 6 Make electrical connection to the meter with reference to the Terminal Definition table. Note Mains Earth must NOT be INSTALLATION DIAGRAM connected to pin 4. There is no earth connection required with this meter. Note also that Pin 3 is unused. The instrument may now be tested. 7 For improved accuracy it can be adjusted by turning thespan ad potentiometer whilst applying full scale signal from a calibrated source until exactly full scale is shown on the display. On the DPM8140 and DPM8400 only, first set the display to read zero for 0V input using theoffse potentiometer on the front left hand side of the board. 8 Finally, clip the cover back on and insert the meter into the panel cut-out.Sna the mounting clips into the side of the case (refer to installation diagram) and tighten the fixing screws until secure in the panel - do not over tighten DPM8000-2 Rev 3 10/03VR2 PCB LAYOUT NOTES 1 To measure voltages above the meters basic sensitivity, attenuator resistors R17 and R18 need to be installed. The general equation to determine their values is given by: VIN = VD x (1 + R17/ R18) Where VIN is the input voltage required and VD is the corresponding display voltage. Note, VD max is actually 199.9mV for a nominal Decimal point 200mV basic sensitivity meter and 1.999V for a nominal 2V meter DIP switch on 4.5 digit Examples models VIN Display VD R17 R18 20V 19.99V 1.999V 1M 110K SPAN OFFSET Zero offset ADJUST addition. 10V 1500rpm 1.5V 1M 176K adjust (where fitted) For standard input ranges choose the corresponding resistors from VR1 VR2 the range specification table below. A to D Converter Chip 1 2 2 For inputs greater than 200V, R17 must be a high voltage resistor 3 such as Philips VR37 Series (1x2M2, 0.5W, RS164-8316) with JP2 Decimal point R18=2k2 Alternatively, use two carbon film resistors in series, such as select jumper Multicomp MCF (2x1M2, 0.5W, Farnell 262-195) with R18 as 2K4. on 3.5 digit See the options for R17 below. The maximum input voltage on this models range with correct resistors is 650V. 3 For ranges of 200V or less, for R17, use metal film resistors, 1%, 0.5W F1 as Farnell 545-314. For basic 200mV use only existing link JP1 4 For R18, on all voltage ranges, use metal film resistors, 1%, 0.25W Power supply LINK input fuse JP1 5 On current ranges, use metal film resistors, 0.5W for R30. The current, R17 100mA rated using internal shunt resistor R30 must not exceed 2 Amps. Leave link R18 (see Note 6) JP1 in place 6 The power supply input protection fuse is a 20mm cartridge type rated R30 at 250V / 100mA. 12 3 45 6 78 9 Options for Resistor R17 In In N/c 0v Hold +5V 230 115 0 Hi Vac Vac Vac Lo dc i/p dc 200mV and Ranges below Ranges above 200V current 200V Important Observe the mains Solder Warning: input connections Make no connection from pin 4 to mains earth under any R17 R17 R17 R17 conditions. Link JP1 Metal film Single Hi Two carbon resistor Voltage resistor film resistors RANGE SPECIFICATION MODEL NUMBER RESOLUTION BASIC RANGE OVERLOAD R17 R18 R30 LINK INPUT (of range required) SENSITIVITY REQUIRED PROTECTION JP1 IMPEDANCE 8100, 8120, 8140 100 V 200mV 0.2V 100V IN >I00M 8400, 8420 10 V 8100, 8120, 8140 1mV 200mV 2V 100V 1M 110K OUT 1M 8400, 8420 100 V 8100, 8120, 8140 10mV 200mV 20V 300V 1M 10K OUT IM 8400, 8420 1mV 1mV 8100A, 8120A 2V 2V 100V IN >I00M 8400A, 8420A 100 V 8100A, 8120A 10mV 2V 20V 100V 1M 110K OUT IM 8400A, 8420A 1mV 100mV 8100A, 8120A 2V 200V 10K 300V 1M OUT IM 8400A, 8420A 10mV 8100A, 8120A 1V 650V 2V 2M2 2K2 700V OUT 2M2 8400A, 8420A (see note 2) 100mV 0.1 A 8100, 8120, 8140 200mV 200 A Ik 1K IN 8400, 8420 10nA DO NOT 8100, 8120, 8140 1A EXCEED 2mA 100R IN 200mV IOOR 8400, 8420 0.1 A DISSIPATION RATING OF 10 A 8100, 8120, 8140 200mV 20mA SHUNT 10R IN IOR 8400, 8420 1A RESISTOR 100 A 8100, 8120, 8140 RC 200mA 1R IN 200mV IR 8400, 8420 10 A (SEE NOTE 5) 8100, 8120, 8140 1mA 2A 0R1 IN 200mV R1 (0.1) 8400, 8420 100 A DP8000-2 Rev3 10/03 anders electronics plc Bayham Place, London NW1 OEU UK Tel: +44 (0)20 7380 8167 Fax: +44 (0)20 7874 1908