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SERVICE MANUAL

BK Precision 2831D

4 1/2 Digit True RMS Digital Multimeter

Ver. 2.1 (02/15/2007)

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Summary of Contents for 2831D

Page 1: ...SERVICE MANUAL BK Precision 2831D 4 1 2 Digit True RMS Digital Multimeter Ver 2 1 02 15 2007...

Page 2: ...2 CONTENTS 1 Performance Check Procedure 2 Calibration Procedure 3 Circuit Description 4 Parts List 5 Circuit Diagram...

Page 3: ...DC form Meter calibrator to DUT c Check the reading value is in specification 0 9990 to 1 0010 DC Volt Rollover check Supply DC 1V and 1V alternately and check the digit error is within 5 digits d Ch...

Page 4: ...5kHz and check the reading value of DUT is in the specification 0 9740 to 1 0260 4 Change the out put of Meter calibrator to 1V 10kHz and check the reading value of DUT is in the specification 0 9490...

Page 5: ...2k 1 Select the Standard Decade Resistor to 100 0 and connect to DUT 2 Check the reading value of DUT is in specification 0 0993 to 0 1007 3 Select the Standard Decade Resistor to 1 0000 k and connec...

Page 6: ...mA 5kHz and check the reading value of DUT is in the specification 0 9690 to 1 0310 Change the range to 20mA 1 Change the out put of Meter calibrator to 10mA 50Hz and check the reading value of DUT is...

Page 7: ...he specification 18 905 to 20 095 1 6 DC Current Function Check Specification Range Resolution Accuracy Over Load Protection 2 mA 20 mA 200 mA 100 nA 1 uA 10 uA 0 75 5d 2 A 100 uA 1 0 5d 2A 250V F Typ...

Page 8: ...han 5digits is added in measuring value a Set the function and range of DUT to Freq and 20kHz b Supply 10 000 kHz to DUT and check the reading value is in specification 9 895 to 10 105 c Change the ra...

Page 9: ...100 00V on the DUT f Change the range to 1200V and supply 1000V DC from Meter calibrator And adjust VR200 for reading 1000 0V on the DUT 2 4 AC Voltage reference adjustment a Set the function AC V and...

Page 10: ...nd adjust VR102 for reading 0 000 c Supply 10 kHz 3V from Meter calibrator and adjust VR14 for reading 10 000 on the DUT d Change the range to 200 kHz and supply 100 kHz 3V from Meter calibrator And a...

Page 11: ...o regulator J13 3 and applied through R32 to a circuit that needs 5V 3 4 2 5V Circuit Output of 5V is converted to 5V by being applied to ZDP1 C45 1 and 5V is applied to a circuit that needs 3 4 3 15V...

Page 12: ...king and connects the current input terminal to R5 3 8 3 10A Measuring Circuit The current applied to the input is connected to R72 through the 10 time amplifying circuit that meets with R100 at the i...

Page 13: ...tate and becomes the trigger signal of U8 2 by being differentiated by C26 R55 When the trigger signal is applied to U8 2 U8 monostable multivibrator with U8 3 output generates the square wave of 20kH...

Page 14: ...E104 50 CER CAPACITOR SMD 0 1uF50V 100nF 22 00 C28 35 36 42 48 51 53 55 56 59 60 C100 305 306 307 309 310 311 312 314 315 1C120 CE221 50 CER CAPACITOR SMD 220pF 50V 1 00 C18 1C120 CE224 50 CER CAPACIT...

Page 15: ...1 8W 2 00 60 300 1R122 CF104J C F RESISTOR SMD 100KJ 1 8W 7 00 22 45 49 70 71 72 315 1R122 CF105J C F RESISTOR SMD 1MJ 1 8W 5 00 20 21 24 28 29 1R122 CF114J C F RESISTOR SMD 110KJ 1 8W 1 00 63 1R122 C...

Page 16: ...SISTOR SMD 90KF 1 8W 2 00 R311 313 1R213 MF0090C M F RESISTOR 9 1 4W C 1 00 34 1R213 MF0900C M F RESISTOR 90 1 4W C 1 00 32 1R213 MF1102F M F RES 11K 1 4W F 1 00 68 1R213 MF2501F M F RES 2 5K 1 4W F 1...

Page 17: ...J14 J14T 1W720 LW012 LEAD WIRE AWG18 80mm RED 300V 1 00 A AT 1X310 100R00KHZ CRYSTAL 100 00KHZ 1 00 Y1 1Z112 8302 M10 MAIN PCB 8302 M10 1 00 2001 04 03 M10 UL E103670 1Z312 DM12 MAGNETIC BUZZER DM 12...

Page 18: ...W 1 00 R1 1R615 WW0 1D WIRW WOUND 0 1F 5W 1 00 R5 1R918 STR01D SHUNT RES 0 01D 5W 1 00 R100 1W720 LW006 LEAD WIRE AWG18 250mm RED 600V 1 00 J6 1W720 LW007 LEAD WIRE AWG18 250mm BLACK 600V 1 00 J7 COM...

Page 19: ...BE Pi5 x 15 mm 5 00 NOISE FILTER FUSE HOLDER 1W510 0003 HEAT TUBE Pi 12 x 60 mm 1 00 FUSE HOLDER 1W720 LW013 LEAD WIRE 22AWG AWM 1617 100mm RED 1 00 VOLTAGE SELECTOR MAIN 1W720 LW014 LEAD WIRE 22AWG A...

Page 20: ...00 MAIN PCB BOTTOM CASE ASS Y 2U110 SR0005 SPRING COIL Pi10x6 2 BN DAG 1 00 MAIN BOTTOM SHIELD ASS Y 2V210 MP0002 MOUNTING POLE 3x5 w M3 N S 3 00 MOUNTING POLE BOT SHIELD ASS Y 2V120 MP0006 HEXON POL...

Page 21: ...21 5 CIRCUIT DIAGRAM Refer to attached PDF File 8302M 10 Circuit diagram...

Page 22: ...8K TL062 3 2 1 C201 101 R303 5 6K R314 10K C311 104 R57 10 R45 100K D13 KDS226 C305 104 Q6 MPSA13 R R35 VR101 5K R307 5 6K C33 0 47 VR13 20K R49 100K C307 104 R78 FREQUENCY FR105 D6 C309 104 R302 2 2K...

Page 23: ...i t 10 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 C 8 9 Thursday April 14 2005 Title Size Document Number Rev Date Sheet of SW SLIDE DPDT SW SLIDE DPDT J1 9 J1 8 VR2 R2 C2 VR3 C3 4 R40 C19 J1 7...

Page 24: ...C44 10uF C46 1 10uF C52 47uF C42 104 C56 104 C C 4 U17C 9 10 8 U18C 9 10 8 NOISE FILTER NFU 101 U15 7915 1 3 2 VIN VOUT GND R90 1 5K R96 100 C47 470uF 5 1V 1 2W ZDP1 C53 J13 7805 1 3 2 VIN VOUT GND C...

Page 25: ...b dp c CM d e 8 10 9 8 7 6 5 4 3 2 1 g f CM a b dp c CM d e R103 33 K LED12 1 U1A 74LS02 3 2 1 kHz LED14 V LED10 M LED15 mA LED8 OHM LED6 FREQ LED4 A LED11 DIODE LED3 8 10 9 8 7 6 5 4 3 2 1 g f CM a...

Page 26: ...t C i r c u i t 05 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 A 1 1 Thursday April 14 2005 Title Size Document Number Rev Date Sheet of R100 0 01 SUNT C2 10u 25 R1 75 Q1 3198 Y R4 120 2A 250V F...

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