B+K precision 2831D User manual

SERVICE MANUAL
BK Precision 2831D
4 1/2 Digit True RMS Digital Multimeter
Ver. 2.1 (02/15/2007)

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

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1. Performance Check Procedure
This paragraph explains about check procedure of basic function and accuracy.
1-1. Equipment's required
Table 1-1 is shown test equipment's required.
Table 1-1 Equipment's required
No. Equipment name Model & Specification Remark
1. Meter calibrator Fluke 5700A
2. Standard Decade Resistor 0.1Ω to 10kΩ
3. Standard Decade Resistor 100Ω to 10MΩ
5. Frequency Generator 10 Hz to 200kHz
1-2. DC Voltage Function Check
Specification;
Range Resolution Accuracy Impedance
2 V
20 V
200 V
100 uV
1 mV
10 mV
±(0.05% + 5d)
1000V 100m V ±(0.1% + 5d)
10 MΩ
1200V 1200V 100m V ±(0.3% + 5d)
a. Set the function and range of DUT(Device under test) to "DCV" and “2V”.
b. Supply "1.0000V 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. Change the range to "20V".
e. Change the output voltage of Meter calibrator to 10.000V and check the
reading value of DUT is in specification,"9.990 to 10.010".
f. Change the range to "200V".
g. Change the output voltage of Meter calibrator to 100.00V and check the
reading value of DUT is in specification,"99.90 to 100.10".
h. Change the range to "1200V".
i. Change the output voltage of Meter calibrator to 1000.0V and check the
reading value of DUT is in specification,"994.0 to 1006.0".
Important Note: All accuracies apply to 5% to 95% full scale of each range at 23 degrees C +/- 5 degreesC.
Allow the unit to warm up under power for 30 minutes before performing the Function Check.

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1-3. AC Voltage Function Check
Specification;
Range Resolution Frequency Accuracy Impedance
2V 100 uV 40Hz to 60Hz ±(0.75% + 10d)
60Hz to 1kHz ±(1.5% + 10d)
1kHz to 5kHz ±(2.5% + 10d) 10 M
5kHz to 10kHz ±(5.0% + 10d)
20V 1 mV 40Hz to 60Hz ±(0.75% + 10d)
60Hz to 1kHz ±(2.5% + 10d)
1kHz to 5kHz ±(5.0% + 10d)
5kHz to 10kHz ±(10% + 10d)
200V 10 mV 40Hz to 50Hz ±(1.0% + 10d)
50Hz to 60Hz ±(0.75% + 10d)
60Hz to 1kHz ±(2.5% + 10d)
1kHz to 5kHz ±(5% + 10d)
1000V 100 mV 40Hz to 50Hz ±(1.0% + 10d)
50Hz to 60Hz ±(0.75% + 10d)
60Hz to 400Hz ±(2.5% + 10d)
400Hz to 1kHz ±(5% + 10d)
** Set the Function and range of DUT to "AC V" and “2V”.
1. Set the out put of Meter calibrator to "1V 60Hz" and check the reading
value of DUT is in the specification, " 0.9915 to 1.0085"
2. Change the out put of Meter calibrator to “1V 1kHz” and check the reading
value of DUT is in the specification, " 0.9840 to 1.0160"
3. Change the out put of Meter calibrator to “1V 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 to 1.0510"
* Change the range to "20V".
1. Set the out put of Meter calibrator to "10V 60Hz" and check the reading
value of DUT is in the specification, " 9.915 to 10.085"
2. Change the out put of Meter calibrator to “10V 1kHz” and check the reading
value of DUT is in the specification, " 9.740 to 10.260"
3. Change the out put of Meter calibrator to “10V 5kHz” and check the reading
value of DUT is in the specification, " 9.490 to 10.510"
4. Change the out put of Meter calibrator to “10V 10kHz” and check the reading
value of DUT is in the specification, " 8.990 to 11.010"
* Change the range to "200V".
1. Set the out put of Meter calibrator to "100V 60Hz" and check the reading
value of DUT is in the specification, " 99.15 to 100.85"
2. Change the out put of Meter calibrator to “100V 1kHz” and check the reading
value of DUT is in the specification, " 97.40 to 102.60"
750V

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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, " 991.5 to 1008.5"
2. Change the out put of Meter calibrator to “1000V 400Hz” and check the reading
value of DUT is in the specification, " 984.0 to 1026.0"
3. Change the out put of Meter calibrator to “1000V 1kHz” and check the reading
value of DUT is in the specification, " 949.0 to 1051.0"
1-4. Resistance Function Check
Specification;
Range Resolution Accuracy Over Load
Protection
2 KΩ
20 KΩ
200 KΩ
2 MΩ
0.1 Ω
1 Ω
10 Ω
100 Ω
±(0.2% + 5d)
20 MΩ 1 KΩ ±(1% + 10d)
600V DC or Peak
*. Set the function and range of DUT to "R" and “2kΩ”.
1. Select the Standard Decade Resistor to 100.0 Ω 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 kΩ and connect to DUT.
4. Check the reading value of DUT is in specification, " 0.9975 to 1.0025"
5. Change the range to "20kΩ".
6. Change the resistance value of Decade resistor to 10.000 kΩ and check the
reading value is in specification. " 9.975 to 10.025"
7. Change the range to "200kΩ".
8. Change the resistance value of Decade resistor to 100.00 kΩ and check the
reading value is in specification. " 99.75 to 100.25"
9. Change the range to "2MΩ".
10. Change the resistance value of Decade resistor to 1.0000 MΩ and check the
reading value is in specification. " 0.9975 to 1.0025"
11. Change the range to "20MΩ".
12. Change the resistance value of Decade resistor to 10.000 MΩ and check the
reading value is in specification. " 9.890 to 10.110"
664.4 to 736.0
681.5 to 718.5
693.7 to 706.3
700
700
700
750

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1-5. AC Current Function Check
Specification;
Range Resolution Frequency Accuracy Over Load
Protection
2mA 100 nA 40Hz to 50Hz ±(1.5% + 10d) 2A/250V
20mA 1 uA 50Hz to 60Hz ±(0.75% + 10d) ( F Type
200mA 10 uA 60Hz to 1kHz ±(2.0% + 10d) Fuse )
1kHz to 5kHz ±(3.0% + 10d)
2000mA 100 uA 40Hz to 50Hz ±(1.5% + 10d)
50Hz to 60Hz ±(1.0% + 10d)
60Hz to 1kHz ±(2.0% + 10d)
1kHz to 5kHz ±(3.0% + 10d)
20A 1mA 40Hz to 50Hz ±(1.5% + 10d) 15A/250V
50Hz to 60Hz ±(1.0% + 10d) ( T Type
60Hz to 1kHz ±(2.0% + 10d) Fuse )
1kHz to 2kHz ±(3.0% + 10d)
*. Set the Function and range of DUT to "AC A" and “2mA”.
1. Set the out put of Meter calibrator to "1mA 50Hz" and connect to “mA’
terminal.
2. Check the reading value of DUT is in the specification," 0.9840 to 1.0160"
3. Change the out put of Meter calibrator to “1mA 60Hz” and check the reading
value of DUT is in the specification, " 0.9915 to 1.0085"
4. Change the out put of Meter calibrator to “1mA 1kHz” and check the reading
value of DUT is in the specification, " 0.9790 to 1.0210"
5. Change the out put of Meter calibrator to “1mA 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 in the specification, " 9.840 to 10.160"
2. Set the out put of Meter calibrator to "10mA 60Hz" and check the reading
value of DUT is in the specification, " 9.915 to 10.085"
3. Change the out put of Meter calibrator to “10mA 1kHz” and check the reading
value of DUT is in the specification, " 9.790 to 10.210"
4. Change the out put of Meter calibrator to “10mA 5kHz” and check the reading
value of DUT is in the specification, " 9.690 to 10.310"
*. Change the range to "200mA".
1. Set the out put of Meter calibrator to "100mA 50Hz" and check the reading
value of DUT is in the specification, " 98.40 to 101.60"
2. Set the out put of Meter calibrator to "100mA 60Hz" and check the reading
value of DUT is in the specification, " 99.15 to 100.85"
3. Set the out put of Meter calibrator to "100mA 1kHz" and check the reading
value of DUT is in the specification, " 97.90 to 102.10"
4. Set the out put of Meter calibrator to "100mA 5kHz" and check the reading
value of DUT is in the specification, " 96.90 to 103.10"

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*. 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. Set the out put of Meter calibrator to "1A 60Hz" and check the reading
value of DUT is in the specification, " 989.0 to 1011.0"
3. Change the out put of Meter calibrator to “1A 1kHz” and check the reading
value of DUT is in the specification, " 979.0 to 1021.0"
4. Change the out put of Meter calibrator to “1A 5kHz” and check the reading
value of DUT is in the specification, " 969.0 to 1031.0"
*. Change the range to "20A".
1. Set the out put of Meter calibrator to "19.5A 50Hz" and check the reading
value of DUT is in the specification, "19.198 to 19.803"
2. Set the out put of Meter calibrator to "19.5A 60Hz" and check the reading
value of DUT is in the specification, "19.295 to 19.705"
3. Set the out put of Meter calibrator to "19.5A 1kHz" and check the reading
value of DUT is in the specification, "19.100 to 19.900"
4. Set the out put of Meter calibrator to "19.5A 2kHz" and check the reading
value of DUT is in the 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 Type Fuse)
20 A 1 mA ±(1.0 % + 10d) 15A/250V
*. Set the Function and range of DUT to "DC A" and “2mA”.
1. Set the out put of Meter calibrator to "1mA DC" and connect to “mA’ terminal.
2. Check the reading value of DUT is in the specification, " 0.9915 to 1.0085"
*. Change the range to "20mA".
1. Set the out put of Meter calibrator to "10mA" and check the reading
value of DUT is in the specification, " 9.915 to 10.085"
*. Change the range to "200mA".
1. Set the out put of Meter calibrator to "100mA" and check the reading
value of DUT is in the specification, " 99.15 to 100.85"
*. Change the input connector to “A” terminal and change the range to "2A".
1. Set the out put of Meter calibrator to "1A" and check the reading
value of DUT is in the specification, " 989.0 to 1011.0mA"
*. Change the range to "20A".
1. Set the out put of Meter calibrator to "19.5A" and check the reading
value of DUT is in the specification, "19.295to 19.705"
Do not apply currents above 10A for more than 15 seconds.
Do not apply currents above 10A for more than 15 seconds.
( T Type Fuse)
19.0A
19.0A
19.0A
19.0A
19.0A
18.8
19.2
18.705
19.295
18.8
19.2
18.61
19.39
18.42
19.58

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1-7. Frequency Function Check
Specification;
Range Resolution Accuracy Over Load
Protection
20 KHz 1 Hz ±(1.0% + 5d)
200 kHz 10 Hz ±(2.0% + 5d) 600V DC or Peak
* The digit error(less than 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 range to "200kHz".
d. Set the out put of Signal Generator to "100kHz" and check the reading
value of DUT is in the specification, "97.50 to 102.50"
Supply freq. @ 5Vpp.
Supply freq. @ 5Vpp.

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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. Equipment's required
Table 2-1 is shown test equipment's required.
Table 2-1 Test Equipment's Required
No. Equipment name Model & Specification Remark
1. Meter calibrator Fluke
2. Standard Decade Resistor 0.1Ω to 10kΩ
3. Standard Decade Resistor 100Ω to 10MΩ
4. Frequency Generator 10 Hz to 200kHz
2-3. DC Voltage reference adjustment
a. Set the function "DC V" and connect test leads to input terminal(Red to V
input terminal, Black to Common terminal) and select “2V’ range.
b. Short test leads for reading “+/-0.0005” on the DUT.
c. Supply "1.0V DC" from Meter calibrator and adjust "VR15" for reading
"1.0000" on the DUT.
d. Change the range to “20V” and supply “10V DC” from Meter calibrator.
And adjust “VR3“ for reading “10.000” on the DUT.
e. Change the range to “100V” and supply “100V DC” from Meter calibrator.
And adjust “VR4“ for reading “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 connect test leads to input terminal(Red to V
input terminal, Black to Common terminal) and select “2V’ range.
b. Short test leads and adjust “VR101” for reading “0.00” on the DUT.
c. Supply "1.0V 60Hz" from Meter calibrator and adjust "VR100" for reading
"1.0000" on the DUT.
2-5. Resistance reference adjustment
a. Set the function "Ω" and connect test leads to input terminal(Red to V
input terminal, Black to Common terminal) and select “2000kΩ” range.
b. Supply "1000k Ω " from Meter calibrator and adjust "VR10" for reading
"1000.0" on the DUT.
c. Change the range to “2 kΩ ” and supply “100 Ω ” from Meter calibrator.
And adjust “VR12“ for reading “0.1000” on the DUT.
d. Supply "1kΩ " from Meter calibrator and adjust "VR1" for reading "1.0000"
on the DUT.
e. Change the range to “20 kΩ ” and supply “10k Ω ” from Meter calibrator.
And adjust “VR2“ for reading “10.000” on the DUT.
f. Change the range to “200 kΩ ” and supply “100k Ω ” from Meter calibrator.
And adjust “VR201“ for reading “1.0000” on the DUT.
g. Change the range to “20 MΩ ” and supply “10 MΩ ” from Meter calibrator.
And adjust “VR11“ for reading “10.000” on the DUT.
9.993V
99.93
.9993V

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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”.
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 adjust “VR13“ for reading “100.00” on the DUT.
2-7. DC Current “0” adjustment
a. Set the Function and range of DUT to "DC A" and “2mA”.
b. Short test reads(mA input terminal and Common terminal) and adjust
“VR301” for reading “000.0”.

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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.
3-2. SYSTEM REFERENCE
The reference of the value(1.0000V)to be measured is applied to U10-2 at VR15.
3-3. System Frequency
The 100kHz square wave generated at Y1 (Crystal) is applied to U10-22.
3-4. Power Circuit
AC power source is used as input power, and AC voltage is applied to each
regulator IC passing 2 rectifier circuits at 2nd side of the power transformer.
3-4-1. +5V Circuit
As the voltage rectified through D15, D16, D17, D18 rectifier diode at the 2nd
side of the power transformer is applied to regulator IC J13-1, +5V is output to
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 Circuit
Of the voltages rectified through D19, D20, D21, D22 rectifier diode at the 2nd
side of the power transformer, cathode of D20 and D21 is applied to U15-1, and
at this time +15V is output to 3 and applied through D23 to the circuit that
needs +15V.
3-4-4. -15V Circuit
Of the voltages rectified through D19, D20, D21, D22 rectifier diode at the 2nd
side of the power transformer, cathode of D19 and D20 is applied to U16-2, and
at this time +15V is output to 3 and applied through D24 to the circuit that
needs +15V.
3-4-5. Frequency Power (+5V)Circuit
J14T and J14 are used as power supply for frequency measuring circuit by
outputting power supply of +5V to 3 by applying output of +15V of D23 cathode to
U20-1.
3-5. 10-Time Amplifier Circuit
All signals can be applied in DC voltage to R72 that is input of A-D converter,
only through the 10-time amplifying circuit by using op-amp of U14.

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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.
3-8. DC Current Measuring Circuit
3-8-1. 2mA,20mA,200mA Measuring Circuit
The current applied to the input is connected to R72 through the 10-time
amplifying circuit that meets with attenuator resistance at R32, R34, R37.
3-8-2. 2000mA Measuring Circuit
The current applied to the input is connected to R72 through the 10-time
amplifying circuit that meets with R5 at the input board. At this time, the
reply in the input board starts working, but U1-3, U1-2 at the front board turn
to the low state, while U3-1 is put in the high state and connects the front
board P6 and the input board J1 with wire.
When U3-1 signal is connected to the base of Q1 after passing input board R2 and
sets Q1 in motion, the reply starts working 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 input board
3-9. AC Current Measuring Circuit
The AC current measuring circuit keeps its state until the output of 10-time
amplifying circuit and then becomes equal to the AC voltage circuit. The AC
current signal is amplified 10 times when applied to C300 after passing the 10-
time amplifying circuit and then linked to R72 as it is converted to DC from
U21, U22.
3-10. Resistor Measuring Circuit
The resistor measuring circuit can measure 2kohm by R4, VR1, 20kohm by R4, VR1,
R3, VR2, and 200kohm, 2Mohm and 20Mohm by R4, VR1, R3, VR2, VR201, R1. The
measurement is performed in the following way ; the source voltage of measuring
circuit is supplied to A marked on the circuit diagram by U5 output, and DC
voltage appearing in proportion between resistance to be measured and each
attenuator resistance is connected to R72.
3-11. Diode and Continuity Measuring Circuit
3-11-1. Diode Measuring Circuit
When diode is connected in the forward direction to the input, the forward
voltage is applied R18 by the voltage from R17 and the attenuated voltage by R22
is linked to R72 after passing R24.

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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.
AT this time, if the U3-2 voltage is lower than the reference voltage of U3-3,
U3-1 turns to the high state and puts U4-1 in the high state through R26, the
input of buzzer circuit, and then sets the buzzer in motion by operating U4
oscillation circuit.
3-12. FREQUENCY MEASURING CIRCUIT
When the frequency described in the specification is input by using the
frequency generator, the frequency is applied to U7-3 through R52, C25. At this
time, if the signal of frequency is higher than that of U7-2, the signal of U7-1
turns to the high state 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 20kHz
with time constant of R59, C27 and 200kHz with time constant of R58, C27.
The generated square wave 20kHz and 200kHz through the analog switch of U9-12
and U9-13, respectively, and the attenuated signal by VR14, R65 through the 10-
time amplifying circuit are connected to R72.
3-13. FRONT PANEL FUNTION AND RANGE DISPLAYING LED DRIVER CIRCUIT
The signal of the driver circuit of LED displaying the front panel range is made
by combination of function and range switch selection and U17, U18 IC. Function
LED signal is made by combination of R96 and the function switch.
3-14. HOLD CIRCUIT
If the HOLD switch on the front panel is pressed, the value on display is held
by connecting U10-25 to GND. At this time, over-range value does not appear. In
addition, the hold LED on the front panel is displayed when supplied with power
through R33.

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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 100pF50V CH 1.00 C201
1C111-CE220-50 CER.CAPACITOR 22pF/50V CH 1.00 C3
1C111-CE471-50 CER.CAPACITOR 470pF50V CH 1.00 C200
1C115-CE101-1KV CER.CAPACITOR 100pF/1KV 1.00 C19
1C115-CE102-1KV CER.CAPACITOR 1000pF/AC1KV 3.00 C20,22,25
1C115-CE222-1KV CER.CAPACITOR 2200pF AC 1KV 1.00 C57
1C120-CE010-50 CER.CAPACITOR.SMD 10pF/50V 1.00 C304
1C120-CE012-50 CER.CAPACITOR.SMD 12pF/50V 1.00 C30
1C120-CE045-50 CER.CAPACITOR.SMD 45pF/50V 2.00 C313,316
1C120-CE068-50 CER.CAPACITOR.SMD 68pF50V 2.00 C26,27
1C120-CE101-50 CER.CAPACITOR.SMD 100pF50V 2.00 C21,40
1C120-CE104-50 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.CAPACITOR.SMD 0.22uF50V(220nF) 2.00 C300,302
1C120-CE473-50 CER.CAPACITOR.SMD 0.047uF50V(47nF) 1.00 C303
1C513-MF104-63 M/F.CAPACITOR(BOX) 0.1uF63V(100nF) 1.00 C37
1C513-MF105-63 M/F CAPACITOR(BOX) 1uF63V(1000nF) J 2.00 C32,34
1C513-MF474-275 M/F.CAPACITOR(BOX) 0.47uF/275V(470nF)J 1.00 C33
1C710-EC010-16 ELEC.CAPACITOR 10uF16V 3.00 C24,44,46-1
1C710-EC022-25 ELEC.CAPACITOR 22uF/25V 1.00 C301
1C710-EC047-25 ELEC.CAPACITOR 47uF25V 5.00 C17,29,45-1,49,52
1C710-EC222-35 ELEC.CAPACITOR 2200uF35V 1.00 C41
1C710-EC471-25 ELEC.CAPACITOR 470uF25V 3.00 C43,47,50
1C713-EC001-16 ELEC.CAPACITOR IuF16V SRA TYPE 2.00 C23,31
1CA10-152V-HD SPARK GAP 1.5KV-HD 1.00 SG1
1D110-KE184S SWITCHING DIODE.SMD KDS184A 4.00 D8,11,12,14
1D110-KE226S SWITCHING DIODE.SMD KDS226A 1.00 D13
1D120-4148S SWITCHING DIODE.SMD 1N4148 4.00 D100,101,102,103
1D213-FR105 RECTIFIER DIODE FR105 18.00 D1-4,6,7,9,10,15-24

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) 1.00 RE1
1Q111-MPAS13 TR MPAS13 5.00 Q4,5,6,7,8
1Q121-KE1266S TRANSISTOR.SMD 2SA1266/KTA1504SGR 3.00 1,3,9
1Q121-KE3198S TRANSISTOR.SMD 2SA3198/KTC3875GR 1.00 2
1R113-CF226J C/F. RESISTOR 22MJ, 1/4W 1.00 100
1R114-CF100J C/F. RESISTOR 10J, 1/2W 1.00 82
1R114-CF102J C/F. RESISTOR 1KJ, 1/2W 1.00 RP1
1R122-CF100J C/F. RESISTOR.SMD 10J, 1/8W 2.00 R57,310
1R122-CF101J C/F. RESISTOR.SMD 100J, 1/8W 10.00 30.31.33.56.91-96
1R122-CF102J C/F. RESISTOR.SMD 1KJ, 1/8W 2.00 41.61
1R122-CF103J C/F. RESISTOR.SMD 10KJ, 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-CF152J C/F. RESISTOR.SMD 1.5KJ, 1/8W 6.00 85-90, R317
1R122-CF183J C/F. RESISTOR.SMD 18KJ, 1/8W 1.00 53
1R122-CF200J C/F.RESISTOR.SMD 20J 1/8W 9.00 69.74-81.
1R122-CF204J C/F. RESISTOR.SMD 200KJ, 1/8W 3.00 306.309.318
1R122-CF222J C/F. RESISTOR.SMD 2.2KJ, 1/8W 3.00 73,137,302
1R122-CF224J C/F. RESISTOR.SMD 220KJ, 1/8W 1.00 59
1R122-CF225J C/F. RESISTOR.SMD 2.2MJ, 1/8W 1.00 301
1R122-CF243J C/F,RESISTOR.SMD 24KJ, 1/8W 1.00 47
1R122-CF272J C/F. RESISTOR.SMD 2.7KJ, 1/8W 2.00 42.66
1R122-CF273J C/F,RESISTOR.SMD 27KJ,1/8W 2.00 54.55
1R122-CF302J C/F. RESISTOR.SMD 3KJ, 1/8W 1.00 17
1R122-CF303J C/F.RESISTOR.SMD 30KJ ,1/8W 1.00 58
1R122-CF333J C/F. RESISTOR.SMD 33KJ, 1/8W 1.00 48
1R122-CF394J C/F. RESISTOR.SMD 390KJ, 1/8W 1.00 308
1R122-CF472J C/F. RESISTOR.SMD 4.7KJ, 1/8W 3.00 50.51.64
1R122-CF473J C/F. RESISTOR.SMD 47KJ, 1/8W 5.00 23.25.26.27.101
1R122-CF474J C/F. RESISTOR.SMD 470KJ, 1/8W 2.00 83.84

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) 1.00 VR10
1R15H-GF501M SEMI-FIXED RESISTOR GF06S-B500M(500B) 4.00 VR 1,15,100,200
1R15H-GF502M SEMI-FIXED RESISTOR GF06S-B502M(5KB) 3.00 VR2,4,101
1R15H-GF503M SEMI-FIXED RESISTOR GF06S-B503M(50KB) 2.00 VR3,201
1R160-SF103S SEMI-FIXED RES.SMD 10K,3pie 1.00 VR102
1R160-SF203S SEMI-FIXED RES.SMD 20K(3pie) 2.00 VR12,13
1R160-SF502S SEMI-FIXED RES.SMD 5K,3pie 1.00 VR14
1R212-MF1002F M/F.RESISTOR.SMD 10KF, 1/8W 2.00 R312,314
1R212-MF1783F M/F. RESISTOR.SMD 178KF, 1/8W 1.00 62
1R212-MF9002F M/F. RESISTOR.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 1.00 67
1R213-MF7802C M/F,RESISTOR 78K 1/4W C 1.00 R3
1R213-MF8201C M/F.RESISTOR 8.2K 1/4W C 1.00 R43
1R213-MF8802C M/F,RESISTOR 88K 1/4W C 1.00 6
1R213-MF8803C M/F,RESISTOR 880K 1/4W C 2.00 5,201
1R213-MF9001C M/F,RESISTOR 9K 1/4W C 1.00 R4
1R213-MF9901C M/F,RESISTOR 9.9K 1/4W C 1.00 200
1R214-MF1004F M/F.RESISTOR 1M 1/2W F 2.00 40,44
1R214-MF6004F M/F.RESISTOR 6M 1/2W F 1.00 46
1R216-CF472J C/F, RESISTOR 47K 2W J 1.00 52
1R217-CF334J C/F,RESISTOR 330K 3W J 2.00 7,8
1R414-MG9004C M/G,RESISTOR 9M 1/2W C 1.00 R1
1R615-WW1C WIRW WOUND RES. 1C,1/2W 1.00 37
1S160-010162 KEY SWITCH(8302) SPUL70X1C031 1.00 RANGE 7KEY.
1S163-99199 KEY SWITCH(8302) SPUL70X1C021 1.00 FUNTION 7KEY.
1S321-JPP2295 POWER SWITCH JPP2295MDA,250V4A 1.00 POWER - "UL": E131425
1U110-741S I.C.SMD 741(SAM,NS) 3.00 U14,21,22
1U110-CA3140 I.C(RCA) CA3140(OP-AMP) 1.00 5
1U110-LF411 I.C LF411(OP AMP) 1.00 12

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 1.00 13
1U212-74HC00S I.C.SMD 74HC00(MOTO) 3.00 U4,17,18
1U212-HI4011S I.C.SMD(ST,PHI) HCF4011,HD4011BE 1.00 11
1U260-NE555S I.C.SMD NE555 1.00 8
1U720-7135CPI I.C.(HARRIS) ICL7135CPI 1.00 U10
1W700-LW02120 WIRE ASS'Y 2-2P 120mm Pin type 1.00 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 1.00 B1
2I320-SP0007 SPONGE TAPE 45x25x2T 2.00 MAIN SOLDER SIDE(AC LINE)
2S233-ZN0001 SCREW, TAPPING T3x6BH,ZN-PL 1.00 J13
2ZH11-HS0003 HEAK SINK (ㄷ자)24x14x50 1.00 J13
4-2. Display Board
PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER
1J110-YW02503 WAFER 3pin,YW02503,연호 1.00 CN7
1J110-YW02509 WAFER 9pin,YW02509,연호 4.00 P1,2,3,4
1L110-LTS6760P FND(LITEON) LTS-6760P(RED) 5.00 FND1-5
1L220-LT LED(LITEON) LT(5x5x10).RED 12.00 L1-4,6,8,10-15
1N911-64PIN ROUND PIN 1X64PIN 0.80 FND 1-5
1R113-CF330J C/F. RESISTOR 33J, 1/4W 1.00 R103
1U211-SN74LS02 I.C.(NS) SN74LS02 1.00 U1
1Z122-8302LT-01 DISPLAY PCB 8302-DIS-REV.05 1.00

18
4-3. Input Board
PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER
1C110-CE103-50 CER.CAPACITOR 0.01uF50V(10nF) 1.00 C1
1C710-EC010-16 ELEC.CAPACITOR 10uF16V 1.00 C2
1D110-4148 SWITCHING DIODE IN4148 1.00 D1
1D310-5.6V ZENER DIODE 5.6V 1/2W 1.00 Z1
1F250-50F2000 FUSE(UL,VDE) 50F,250V/2A(20mm) 1.00 F1
1F250-61TL10 FUSE(UL,VDE) 65TL,250V10A(31mm) 1.00 F2
1FH10-FC51S FUSE HOLDER FC-51S(CLIP) 2.00 2A
1FH10-FC61B FUSE HOLDER FC-61B(CLIP) 2.00 10A
1J110-YW02503 WAFER 3pin,YW02503,연호 1.00 J1
1K000-RY12W-K RELAY(LG) RY12W-K(DC-12V) 1.00 RE1
1N950-0001 INPUT SOCKET 4.00 COM, V,,mA,A
1Q111-TO1815 TRANSISTOR 2SC1815GR/C3198 1.00 Q1
1R113-CF103J C/F. RESISTOR 10KJ, 1/4W 1.00 R2
1R113-CF121J C/F. RESISTOR 120J, 1/4W 1.00 R4
1R113-CF471J C/F. RESISTOR 470J, 1/4W 1.00 R3
1R113-CF750J C/F.RESISTOR 75J ,1/4W 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)
1W720-LW008 LEAD WIRE(AWG22) 300mm/RED-300V 1.00 J10A
1W720-LW009 LEAD WIRE(AWG18) 80mm/BLUE(A18-300V) 1.00 J11A
1W720-LW010 LEAD WIRE(AWG18) 80mm/ BLACK-600V 1.00 J9
1W720-LW011 LEAD WIRE(AWG18) 80mm/RED-600V 1.00 J8
1Z192-8302DAGA INPUT PCB (8302) 8302 REV.5 1.00 FRONT PANEKL ASS'Y
4-4. Front Panel Assembly Parts
3E02-BK2831D-00 FRONT PANEL ASS'Y Parts. BK PRECISION 2831D
PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER
1W722-LW03150 WIRE ASS'Y(#24) 3-3pin 150mm 1.00 INPUT J1- DISPLAY CN7
1W722-LW09150 WIRE ASS'Y(#24) 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

19
2T211-TM0001 JACK TERMINAL, ABS DM,6mm,Red,MY-20 3.00 V,Ohm,Hz
2T211-TM0002 JACK TERMINAL, ABS DM, 6mm, Black,MY-20 1.00 COM
2W061-PP0001 WASHER,PAPER 내경 3, 외경 10 2.00 DISPLAY,INPUT J6
3U02-BK2831D-00 DISPLAY PCB ASS'Y BK PRECISION 2831D 1.00 4-2. Display Board
3U09-BK2831D-00 INPUT PCB ASS'Y BK PRECISION 2831D 1.00 4-3. Input Board
4-5. Rear Panel Assembly Parts
3E03-BK2831D-00 REAR PANEL ASS'Y Parts. BK PRECISION 2831D
PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER
1F250-50F500 FUSE(UL,VDE) 50F,250V500mA(20mm) 1.00 FUSE HOLDER IN- "UL" : E126056
1FH20-R311 FUSE HOLDER R3-11,BN 1.00 REAR PANEKL ASS'Y - " UL" : E72169
1N150-TE503 GND CONNECTOR 1.00 GND.
1N711-NFU-101 AC INLET(SAM IL) NFU-101,NOISE FILTER 1.00 AC IN- " UL" : E123275
1S190-HF308 VOLTAGE SELECTOR S/W HF-308, 10A ,250V 1.00 VOLTAGE SELECTOR - UL" : E128307
1T100-DG7202 POWER TRANS FG-7202 1.00 REAR PANEKL ASS'Y
1W510-0001 HEAT TUBE Pi3 x 15mm 6.00 VOLTAE SELECTOR
1W510-0002 HEAT TUBE 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) AWM1617, 100mm-BLACK 1.00 VOLTAGE SELECTOR+MAIN
1W720-LW015 LEAD WIRE(22AWG) AWM1617, 100mm-WHITE 1.00 VOLTAGE SELECTOR+MAIN
1W763-GW00150 WIRE ASS'Y(1015#22) GND WIRE,150mm,LUG 2.00 GND TERMINAL-NFU 101,MAIN
1W790-DW00080 WIRE ASS'Y(1015#22) DIW,80mm,BLACK 1.00 FUSE HOLDER-NFU 101.
1W791-DW03200 WIRE ASS'Y(1015#22) 3pin 2wire 200mm 1.00 NOISE FILTER+FUSE HOLDER
2C120-BR0003 BRACKET, POWER TRANS BN-DAG, 27x10.5,2T 2.00 TRANS
2C120-RP0016 REAR PANEL,PRESS VOLT SELECTOR, FG 1.00 VOLAGE SELECTOR
2N110-BB0001 NUT(GND TERMINAL) INCH 2.00 GND TERMINAL ASS'Y
2N110-NI0001 NUT M3, NI-PL 4.00 TRANS,NFU 101
2S133-BL0001 SCREW, MACHINE M3x10BH,흑착색 4.00 AC INLET, VOLTAGE SELECTOR
2S183-NI0001 SCREW, MACHINE M3x8BH-W, NI-PL 2.00 POWER TRANS ASS'Y
2W011-NI0001 WASHER, PLAIN 내경:3,외경:10/NI-PL 4.00 POWER TRANS.NOISE FILTER
2W021-ZN0001 WASHER, SPRING 내경:3,외경:5, ZN-PL 6.00 TRANS,NOISE FILTER,GND CONNECTOR
2W031-NI0001 WASHER, LATCH 4x6.5x0.3t 1.00 GND CONNECTOR ASS'Y

20
4-6. Line Assembly Parts
3E01-BK2831D LINE ASSEMBLY PARTS BK PRECISION 2831D
PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER
1W611-0001 CABLE TIE 100mm, WHITE 12.00
2C120-SC0012 SHIELD CASE(8302TOP) 177x90x21x0.3t 1.00 TOP SHIELD-MAIN
2C120-SC0013 SHIELD CASE(8302BOT) 203x160x5x0.3t 1.00 BOTTOM SIELD-MAIN
2C211-BC0004 BOTTOM CASE, ABS BN(80SER,난연)-12965 1.00 LG 12965
2C211-TC0006 TOP CASE, ABS BN(80SER.난연)-12965 1.00 LG 12965
2D212-HD0002 HANDLE, ABS BN(80SER.난연)-12965 1.00 LG 12965
2D311-RF0006 RUBBER FOOT BN-DAG,37x8.5,대 2.00 BOTTOM CASE
2D311-RF0007 RUBBER FOOT BN-DAG,32x8.5,소 2.00 TOP CASE
2I320-XX0001 SPONGE PAD 20x40,5T,한쪽 테이프 2.00 MAIN PCB AC POWER LINE.
2K211-KN0015 KNOB, POWER, ABS BN-DAG(80SER.) 1.00 POWER S/W STICK
2K211-KN0016 KNOB, PUSH S/W, ABS BN(80SER.)-12965 14.00 RANGE S/W KNOB
2K211-KN0017 KNOB,PUSH S/W,ABS 10.9x10x7.9, RED 1.00 POWER S/W KNOB
2S123-NI0002 SCREW, MACHINE M3x4DH, H5, NI-PL 3.00 MOUNTING POLE+SHIELD BOTTOM ASS'Y
2S133-ZN0002 SCREW, MACHINE M4x45BH, ZN-PL 4.00 TOP -BOTTOM CASE ASS'Y
2S233-NI0002 SCREW, TAPPING T3x8BH, H6, NI-PL 4.00 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,육각,w. M3 N/S 3.00 MOUNTING POLE-BOT SHIELD ASS'Y
2V120-MP0006 HEXON POLE 5mm NAIL PI(M3.0) 3.00 MOUNTING POLE, TOP SHIELD ASS'Y
2V120-MP0007 MOUNTING POLE P05x30mm (M3.0) 3.00 MAIN-SHIELD CASE
4-7. Packing Parts
3P00-BK2831D PACKING PARTS BK PRECISION 2831D
PART CODE PART NAME SPECIFICATION Q"TY REFERENCE NUMBER
1F250-50F500 FUSE(UL,VDE) 50F,250V500mA(20mm) 1.00 F 500mA/250V -SPARE PART.
1W311-SP102 POWER CORDE(115V) KKP-30,SVT 3/18AWG "UL" 1.00 "UL"-E58075
1W332-0002 TEST LEAD(국내,CE) 안전마크,제조표시 1.00 "CE"
2D411-FB001 RUBBER BEZEL BK PRE. BENCH,BLUE 1.00 FRONT PANEL COVER
6D000-SG0001 SILICA GEL 3g 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) 665x365x380 0.25 BN,4CTN(IN.BOX-345x315x170)
6S40G-VB0001 VINYLE BAG 70x100mm,Zipper Type 1.00 SPARE FUSE
6S40G-VB0004 VINYLE BAG E4x420x360mm,BENCH 용 1.00 PRODUCT PACKINNG.
6S40G-VB0005 VINYLE BAG 300x195, ZIPPER TYPE 1.00 MANUAL PACKING.