Related Manuals for BK Precision 2831D
Summary of Contents for BK Precision 2831D
- Page 1 SERVICE MANUAL BK Precision 2831D 4 1/2 Digit True RMS Digital Multimeter Ver. 2.1 (02/15/2007)
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Page 2: Table Of Contents
CONTENTS 1. Performance Check Procedure 2. Calibration Procedure 3. Circuit Description 4. Parts List 5. Circuit Diagram... -
Page 3: Performance Check Procedure
1. Performance Check Procedure This paragraph explains about check procedure of basic function and accuracy. Important Note: All accuracies apply to 5% to 95% full scale of each range at 23 degrees C +/- 5 degreesC. 1-1. Equipment's required Table 1-1 is shown test equipment's required. Table 1-1 Equipment's required Equipment name Model &... - Page 4 1-3. AC Voltage Function Check Specification; Range Resolution Frequency Accuracy Impedance 100 uV ±(0.75% + 10d) 40Hz to 60Hz ±(1.5% + 10d) 60Hz to 1kHz ±(2.5% + 10d) 1kHz to 5kHz 10 M ±(5.0% + 10d) 5kHz to 10kHz 1 mV ±(0.75% + 10d) 40Hz to 60Hz ±(2.5% + 10d)
- Page 5 3. Change the out put of Meter calibrator to “100V 5kHz” and check the reading value of DUT is in the specification, " 94.90 to 105.10" * Change the range to "1000V". 1. Set the out put of Meter calibrator to "1000V 60Hz" and check the reading value of DUT is in the specification, "...
- Page 6 1-5. AC Current Function Check Specification; Over Load Range Resolution Frequency Accuracy Protection 100 nA ±(1.5% + 10d) 40Hz to 50Hz 2A/250V 1 uA ±(0.75% + 10d) 20mA 50Hz to 60Hz ( F Type ±(2.0% + 10d) 10 uA 200mA 60Hz to 1kHz Fuse ) ±(3.0% + 10d)
- Page 7 *. Change the input connector to “A” terminal and change the range to "2A". 1. Set the out put of Meter calibrator to "1A 50Hz" and check the reading value of DUT is in the specification, " 984.0 to 1016.0mA" 2.
- Page 8 1-7. Frequency Function Check Specification; Over Load Range Resolution Accuracy Protection 20 KHz 1 Hz ±(1.0% + 5d) 600V DC or Peak 200 kHz 10 Hz ±(2.0% + 5d) * The digit error(less than 5digits) is added in measuring value. a.
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Page 9: Calibration Procedure
2. Calibration Procedure 2-1. General This Calibration Procedure should be performed at an ambient temperature of 23 ° C ± 5 ° C and a relative humidity of less than 60%. It allows the instrument to stabilize at this environment for a minimum of 30 minutes. 2-2. - Page 10 2-6. Frequency reference adjustment a. Set the function "Hz" and connect test leads to input terminal(Red to Hz input terminal, Black to Common terminal) and select “20 kHz” range. b. Supply “DC 1V” from Meter calibrator and adjust “VR102” for reading “0.000”.
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Page 11: Circuit Description
3. Circuit Description 3-1. ANALOG TO DIGITAL CONVERSION When all values to be measured are connected to R72, they are applied to U10-10 and the LED driver signal of U10-12, 17, 18, 19, 20 23 and the BCD signal of U10-13, 14, 15, 16 are output by integral constant of R69, R70, C32, C33 and the value is displayed on LED with U13 BCD to 7-segment decoder. - Page 12 3-6. DC Voltage Measuring Circuit DC voltage circuit is attenuated as much as 1/1, 1/100, 1/1000 by R1, VR3, R5, VR4, R6 and linked to R72. 3-7.AC Voltage Measuring Circuit This is same as the attenuator DC voltage circuit of the AC voltage circuit, and the attenuated signal is applied to C300 and then connected to R72 after being converted to DC at U21 and U22.
- Page 13 3-11-2. Continuity Measuring Circuit The continuity measuring circuit sets the reference voltage at U3-3 by R20, R21, R23. When resistance is connected to the input, the voltage is applied R18 by the voltage from R17. The attenuated voltage by R22 is linked to U3-2 through R24 and connected to R72.
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Page 14: Parts List
4. PARTS LIST 4-1. Main Board 3U01-BK2831D-00 MAI N PCB ASS'Y Parts. BK PRECISION 2831D PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER 1C110-CE222-50 CER.CAPACITOR 0.0022uF(2.2nF) 1.00 C6 1C110-CE472-50 CER.CAPACITOR 4.7nF/50V 1.00 C5 1C111-CE004-50 CER.CAPACITOR 4pF50V CH 1.00 C1 1C111-CE101-50 CER.CAPACITOR... - Page 15 1D310-1N5231 ZENER DIODE 5.1V 1/2W 1.00 ZDP1 1D840-LM385BZ BAND GAP DIODE(1.2V) LM385BZ-1.2V MOTO 1.00 Z4 1F310-M265 PTC(FCP1210M265) 1K,650V 1.00 R18 1F420-1A125 FUSE(MICRO FUSE) 1A/125V 1.00 F4 1J110-LW03903 WAFER 3pin,LW114303,한림 2.00 POWER 1J110-YW02503 WAFER 3pin,YW02503,연호 2.00 TRANSFORMER 1J110-YW02509 WAFER 9pin,YW02509,연호 4.00 J1,2,3,4 1K000-D1A05000 RELAY(KUANSHI) D1A05000(DC-5V)
- Page 16 1R122-CF513J C/F. RESISTOR.SMD 51KJ, 1/8W 1.00 305 1R122-CF562J C/F. RESISTOR.SMD 5.6KJ, 1/8W 3.00 303.304.307 1R122-CF620J C/F. RESISTOR.SMD 62J, 1/8W 1.00 316 1R122-CF822J C/F. RESISTOR.SMD 8.2KJ, 1/8W 1.00 65 1R15H-GF102M SEMI-FIXED RESISTOR GF06S-B102M(1KB) 1.00 VR11 1R15H-GF103M SEMI-FIXED RESISTOR GF06S-B103M(10KB) 1.00 VR301 1R15H-GF202M SEMI-FIXED RESISTOR GF06S-B202M(2KB)
- Page 17 1U110-LM393S I.C.SMD LM393(SGS) 1.00 7 1U110-TL062S I.C.SMD TL062(NJRC) 1.00 3 1U110-TL072S I.C.SMD TL072(SGS) 1.00 6 1U120-MO7805 I.C.(SAM.MOTO.NS.) MC7805 2.00 U20,J13 1U120-MO7815 I.C.(SAM.MOTO) MC7815 1.00 15 1U120-MO7915 I.C.(SAM.MOTO) MC7915 1.00 16 1U120-TL431 REGULATOR. IC TL431(TO-92) 1.00 Z3 1U130-4053S I.C.SMD 4053(SGS) 1.00 9 1U211-74LS47 I.C(SGS.PHI.HIT) SN74LS47...
- Page 18 9-9pin 150mm 4.00 DISPLAY P1~P4 - MAIN J1~J4 2C212-FP0003 FRONT PANEL,ABS BN(DM8302-난연)-DAG 1.00 LG 12965. 2L210-BK-PP003 PLATE,FRONT,PC BK 2831D 4 1/2 DMM 1.00 2L320-BK-AC003 ACRYL FILTER (0.8t) BK 2831D 4 1/2 DMM 1.00 2S233-NI0003 SCREW, TAPPING T3x6BH, NI-PL 6.00 DISPLAY, INPUT...
- Page 19 DM, 6mm, Black,MY-20 1.00 COM 2W061-PP0001 WASHER,PAPER 내경 3, 외경 10 2.00 DISPLAY,INPUT J6 4-2. Display Board 3U02-BK2831D-00 DISPLAY PCB ASS'Y BK PRECISION 2831D 1.00 4-3. Input Board 3U09-BK2831D-00 INPUT PCB ASS'Y BK PRECISION 2831D 1.00 4-5. Rear Panel Assembly Parts 3E03-BK2831D-00 REAR PANEL ASS'Y Parts.
- Page 20 1.00 IN BOX IN. 6L110-LS0030 STICKER, S/N BN,10W,115V/230V~ 1.00 10W ,115/230V~ 6M220-UA0062 MANUAL BK PRECISION 2831D 1.00 BK PRECISION 2831D 6P20G-PEPAD001 PE PAD BN, 330x300mm 2.00 IN BOX TOP& BOTTOM SIDE 6P21G-IB0016 IN.BOX(345x315x170) BK PRECISION BENCH 1.00 WHITE DW -MODEL PRINTING 6P22G-CB0014 CARTON BOX(무인쇄)
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Page 21: Circuit Diagram
5. CIRCUIT DIAGRAM * Refer to attached PDF File ( 8302M-10 Circuit diagram) - Page 22 J14-1 KDS226 LM385BZ-1.2V J14-2 47K 2W HOLD VR15 FREQUENCY 2.5K 4.7K 1000P/1KV 47u/25 MPSA13 J2-6 NE555 VR13 * 200KHz -15V MPSA13 DSCHG J2-5 LM393 ICL7135 VCC- UNDRNG 100K OVRNG 110K 178K 0.47 ALGCOM STRB MPSA13 J2-4 4.7K VR14 INTOUT * 20KHz HEF4053BT 20KHz AUTO0...
- Page 23 U18-10 J15-6 U18-2 J15-5 R40.C19 J1-2 U17-5 200V J1-7 J15-4 R2,C2 J1-6 J1 #3 J15-3 VR3 ,C3,4 K-20 J4 #1 J1-5 J1-9 J1-8 J15-7 C200.201 C5,6 U2-5 C12+ U1-5 C3,4 J11A #10A U18#1 J1 #4 SW SLIDE-DPDT SW SLIDE-DPDT R7,8 U18 #12 J12-1 J12-2...
- Page 24 AL105 x4 +5VA 7805 U10-11 10uF VOUT C45-1 ZDP1 SECONDARY 5.1V 1/2W NOISE FILTER POWER TRNAS 2200uF 407uF/ 47uF NFU-101 F0.5A/250V POWER S/W PRIMARY 0.047uF(X2) C46-1 +18V 10uF 2x2200pF(Y) POWER S/W J10A LINE LOAD NFU-101 NOISE FILTER 7815 -18V GND TERMINAL +15V VOUT 115V...
- Page 25 P1-2 J1-2 J2-5 P2-5 LED13 HOLD J2-6 P2-6 P1-4 J1-4 J2-4 P2-4 LED3 DIODE P1-6 J1-6 J2-3 P2-3 LED2 J2-2 P2-2 P1-9 J1-9 J2-1 P2-1 LED1 P1-8 J1-8 LED14 P4-1 J4-1 LED4 FREQ. P1-5 J1-5 R103 33 J3-6 P3-6 P1-3 J1-3 J3-7 P3-7...
- Page 26 V/R/FREQ BLACK J10A CURRENT-2A 2A/250V F RW-12KY 6,11 FUSE R100 J11A 0.01/SUNT CURRENT-20A 15A/250V T 0.1/5W F FUSE 1N4148 3198-Y 10u/25 J1-2 J1-3 J1-1 5.6V 4 1 / 2 D i g i t D i g i t a l M u l t i m e t e r Title I n p u t C i r c u i t Size...