B+K precision 2831D Bedienungsanleitung

SERVICE MANUAL

BK Precision 2831D

4 1/2 Digit True RMS Digital Multimeter

Ver. 2.1 (02/15/2007)

CONTENTS

1. Performance Check Procedure

2. Calibration Procedure

3. Circuit Description

4. Parts List

5. Circuit Diagram

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.

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

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

750

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"

*. 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.

( T Type Fuse)

19.0A

18.8

19.2

18.705

19.295

18.8

19.2

18.61

19.39

18.42

19.58

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.

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

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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