B+K precision 2831D User manual

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Instruction Manual
Model 2831D
4 ½ Digit True RMS Digital Multimeter

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CONTENTS
1. PRODUCT DESCRIPTION
1-1. Introduction --------------------------------------------------------- (3)
1-2. Technical Specifications ---------------------------------------- (6)
1-3. Equipment Ratings ----------------------------------------------- (8)
1-4. Supplied Accessories -------------------------------------------- (9)
1-5. International electrical Symbol -------------------------------- (9)
2. INSTALLATION
2-1. Initial Inspection --------------------------------------------------- (10)
2-2. Connecting AC Power ------------------------------------------- (10)
2-3. Cooling and Ventilation ----------------------------------------- (10)
2-4. Position -------------------------------------------------------------- (10)
2-5. Warming-Up ------------------------------------------------------- (10)
3. OPERATION
3-1 Voltage Measurement -------------------------------------------- (11)
3-2 Current Measurement -------------------------------------------- (11)
3-3 Resistance Measurement --------------------------------------- (12)
3-4 Diode Measurement ---------------------------------------------- (13)
3-5 Continuity Test ----------------------------------------------------- (13)
3-6 Frequency Measurement --------------------------------------- (13)
4. MAINTENANCE
4-1. Fuse Replacement ----------------------------------------------- (14)
4-2. Adjustment and Calibration ------------------------------------ (14)
4-3. Cleaning and decontamination ------------------------------- (14)

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1. PRODUCT DESCRIPTION
1-1. Introduction
Thank you for purchasing our product. Electronic measuring instruments produced
by us are high technology products made under strict quality control. We guarantee
their exceptional precision and utmost reliability. For proper use of the product,
please read this operation manual carefully.
Note
1. To fully maintain the precision and reliability of the product use it within the range
of standard setting (Temperature 10 °C~35 °C, Humidity 45%~85%)
2. After turning of power, please allow a pre-heating period of as long as some 30
minutes before use.
3. This equipment should be used with a triple line power cord for safety.
4. For quality improvement the exterior design and specification of the product can
be changed without prior notice.
5. If you have further questions concerning use, please contact our service center or
sales outlet.
This Digital multimeter is a portable, bench type Digital multimeter with a 4 1/2 digit
light-emitting diode. This Digital multimeter can make diode measurements,
Frequencymeasurements & continuity test, in addition to Current, Voltage and
Resistance measurements.
nFeatures
•Bench type True RMS Digital Multimeter with 41/2digit (LED)display.
•Basic accuracy for DCV ; 0.05 %
•Overload protection on all range
•AC/DC Voltage measurement(Up to DC 1200V, AC 1000V)
•AC/DC Current measurement(Up to 20A)
•Resistance measurement(Up to 20Mohm)
•Frequency Measurement(Up to 200kHz)
•Audible continuity test

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FIG.1 FRONT PANEL
nInput Terminal
?COM : COMMON Terminal
?V/O/Hz : VOLT/ OHM/CONTINUITY/ FREQUENCY/ DIODE TEST Input Terminal
?mA : mil Ampere Input Terminal
?A : Ampere Input Terminal
nFunction Selection
?I/O Power ON/OFF ?AC A AC Current
?DC V DC Voltage ?OResistance
?AC V AC Voltage ?DIODE Diode & Continuity
?DC A DC Current ?FRQ Frequency
nRange Selection
?2
2V, 2mA ,2 kohm
?20 M20 Mohm
?20
20V, 20mA , 20kohm, 20kHz
?20A
20A
?200
200V,200
mA, 200kohm, 200kHz
?HOLD Data Hold
321 11 97 84 5 6 10 12 1413 a
V
ON OFF
V
POWER
H
DC
AC . FRQ
2000mA MAX
1200V
1000V
RANGE
kHz
V/mA/k
FUNCTION
A A FRQ 202200
HOLD
20M2000 20A
kHzM
A
k
mA
mA
FUSED
500V
COM
EACH 15min.
1000V
1200V
MAX 20AMAXFUSED
MAX.15sec
V
HzV
A
dc
be

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?2000
DC 1200V/AC1000V
, 2000mA,2000 kohm
nInput Terminal Limits
Switch
Function
Input
Terminals
Red Black
Min.Display
Reading Max.Display Reading Maximum Input
DC V VΩHz COM 0.0001V 1200.0V 1200Vdc,
AC V VΩHz COM 0.0001V 1000.0V 1000 Vac
OHM VΩHz COM 0.0001kΩ19.999MΩ600 V(1Min)
Diode/Cont. VΩHz COM 0.11999.9 600 V(1Min)
DC mA mA COM 0.0001mA 1999.9mA 2 A
AC mA mA COM 0.0001mA 1999.9mA 2 A
DC A A COM 0.001 A 19.999 A 20.00 A
AC A A COM 0.001 A 19.999 A 20.00 A
Frequency VΩHz COM 0.001KHz 199.99KHz 600 V(1 Min)
FIG.2 REAR PANEL
AC INLET : AC power input connector
VOLTAGE SELECTOR : Selects the AC Power (115V or 230V)
FUSE HOLDER : Replace fuse by unscrewing.
REPLACE ONLY WITH FUSEAND FIRE,
Made in Korea
POWERMAX
POWER SUPPLY BEFORE
SAME RATING AND TYPE.
DO NOT REMOVE COVER.
REFER SERVICING TO
230V~
115V ~
VOLTAGE
S/N:
0.2A F
0.5A F
FUSE
PERSONNEL.
REPLACING FUSE.
DISCONNECT
OF
10W
10W
QUALIFIED
TO PREVENT ELECTRIC SHOCK HAZARD
WARNING
115V 230V
3 2
SELECTOR
VOLTAGE
FUSE
115
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AC IN
50/60Hz

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GROUND TERMINAL
1-2 Technical Specification
Important Note: All accuracies apply to 5% to 95% full scale of each range
-DC VOLT
Range Resolution Accuracy Impedance
2V
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)
-AC VOLT
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 MΩ
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)

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-DC CURRENT
Range Resolution Accuracy Over Load Protection
2mA
20 mA
200 mA
100 nA
1 uA
10 uA ±(0.75% + 5d)
2A 100 uA ±(1.0% + 5d)
2A/250V
20 A 1 mA ±(1.0% + 10d)15A/250V
20A Range for 15 seconds max during each 15 minute period
-AC CURRENT
Range Resolution Frequency Accuracy Over Load Protection
2mA 100 nA40Hz to 50Hz ±(1.5% + 10d) 2A/250V
20mA 1 uA 50Hz to 60Hz ±(0.75% + 10d)
200mA 10 uA 60Hz to 1kHz ±(2.0% + 10d)
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)
60Hz to 1kHz ±(2.0% + 10d)
1kHz to 2kHz ±(3.0% + 10d)
20A Range for 15 seconds max during each 15 minute period

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-RESISTANCE
Range Resolution Accuracy Over Load Protection
2KO
20 KO
200 KO
2MO
0.1 O
1 O
10 O
100 O
±(0.2% + 5d)
20 MO1 KO±(1% + 10d)
600V DC or Peak
-FREQUENCY
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.
-AUDIBLE CONTINUITY
Test Volt Threshold Over Load Protection
3V Less Than 200 ohm 600V DC or Peak
-DIODE TEST
Test Volt Max. Test Current Over Load Protection
2VApprox. 1.0 mA 600V DC or Peak
nDIMENSION AND WEIGHT
•Dimensions HWD: 9.4 x 3.5 x 10.6” (240 x 90 x 270mm)
•Weight Aprox : 4.6lb (2.1 kg.)
1-3. Equipment Ratings
lPlug and Socket : 3 wire ac power plug and 3 wire outlet
lPower & Fuse Ratings
Input Voltage Fuse Power Max.

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103 ∼126V AC (50/60Hz) F 0.5A / 250V
206 ∼252V AC (50/60Hz) F 0.2A / 250V
10 W
lOperating Environment:
Temperature :0°C to + 40 °C (Accuracy Specified at 23°C ±5 °C)
Temperature Coefficient : 0.1x( Specified Accuracy) per°C
HUMIDITY: up to 85% RH(Relative Humidity) to 40°C without temperature
extremes causing condensation within the instrument.
lStorage Environment:
TEMPERATURE: -20°C to +70°CHUMIDITY: below 85% RH
lInsulation Category II: Portable equipment of local level.
lPollution Degree: 2
lProtection to IEC 529: Ordinary
Note: Specifications are subject to change without notice.
1-4. Supplied Accessories
lUser’s Manual ----------------------------------------------------- 1
lTestLeads---------------------------------------------------------- 1
lPower cord---------------------------------------------------------- 1
lSpare Fuse--------------------------------------------------------- 1
1-5. International electrical symbol
SAFETY RULES
lRemember: THINK SAFETY AND ACT SAFELY.
lRead these operating instructions thoroughly and completely before operating
this meter.
lPay particular attention to WARNINGS used for conditions and actions that
pose hazard to the user and CAUTIONS used for conditions and actions that
may damage the meter.
lAlways to inspect this meter, test probes and accessories for any sign of
damage or abnormality before every use.
lNever ground yourself and keep your body isolated from ground.
lNever touch exposed wiring, connections or any live circuit conductors.
lDisconnect the live test probe before disconnecting the common test probe.
lUse caution when working above 60V DC or 25V AC rms. Such voltages pose a
shock hazard.SAFETY SYMBOLS

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2. INSTALLATION
2-1. Initial Inspection
This instrument was carefully inspected both mechanically and electrically
before shipment. It should be physically free of damage. To confirm this, the
instrument should be inspected for physical damage which may have occurred in
transit. Also, verify that all supplied accessories have been included.
2-2. Connecting AC Power
This instrument requires 115V AC or 230V AC (50-60 Hz)power socket with
protective earth contact (PE-contact). If it is available only a power socket without
PE-contact (so a 2-conductor ac power) then a power socket with PE-contact must
be installed before or the appliance should be provided with a PE-screw-terminal
which is not soluble by hand and not soluble before 2-conductor power lines.
CAUTION
AC POWER OF THIS INSTRUMENT IS PRESET TO 115V IN FACTORY.
BEFORE POWERING ON THIS INSTRUMENT, CHECK AND MAKE SURE
THE VOLTAGE OF THE POWER SOURCE IS SAME WITH THE MARKING OF
UNIT.
IN CASE OF AC230V, VOLTAGE SELECTOR (on rear panel) SHOULD BE
SELECTED TO 230V POSITION.
2-3. Cooling and Ventilation
No special cooling and ventilation is required. However, the instrument should be
operated where the ambient temperature is maintained.
2-4. Position
This instrument is built as a bench-type instrument with rubber feet and tilt stand
in place. The stand-up angle can be adjusted by changing the angle of the carrying
handle.
2-5. Warming-Up
DANGEROUS VOLTAGE
AC-ALTERNATING CURRENT
DC-DIRECT CURRENT
SEE EXPLANATION IN MANUAL
GROUND
FUSE

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Allow at least 30 minutes for the unit to warm up so that it can stabilize.
3. OPERATION
3-1 Voltage Measurement
Voltage is the difference of electrical energy (potential) between two points.
Measuring voltage allows you to verify the following questions.
lIs voltage present? The presence of voltage tells you that the circuit is delivering
voltage to the component you are testing.
lWhat is the level of voltage? The voltage level tells you that whether the proper
voltage is arriving at the components.
lWhat is the voltage drop? The voltage drop tells you how much of voltage is
being consumed by the components.
WARNING---HIGH VOLTAGE
TO AVOID POSSIBLE ELECTRIC SHOCK AND/OR EQUIPMENT DAMAGE,
DO NOT ATTEMPT TO TAKE ANY VOLTAGE MEASUREMENTS IF THE
VOLTAGE IS ABOVE 1200V DC OR 1000V AC. THE "COM" TERMINAL
POTENTIAL SHOULD NOT EXCEED 500V TO THE GROUND.
(1)Plug the red and the blacktestleads into the VΩand the COMinput terminals
respectively.
(2) Verify dc or ac.Select the function (dc V or ac V) and set the range switch to the
desired volt range. For unknownvoltage, always start from highestrange and move
downto lower range to selectscale for bestreading.
(3) Connectthe probe tips in parallel with the voltage sourceto be measured.
(4) Read voltage value on the Display.
3-2 Current Measurement
Current is the flow quantity of electrons through a conductor. Ampere is the amount
of electrons flowing through a conductor.
CAUTION
DO NOT ATTEMPT TO TAKE A CURRENT OF MORE THAN SPECIFIED.

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ALWAYS START WITH THE HIGHEST RANGE FOR UNKNOWN CURRENT.
THE “mA INPUT” TERMINAL IS PROTECTED BY A 2000mA/250V F TYPE
FUSE AND “A INPUT”TERMINAL IS FUSED WITH 15A/250V T TYPE.
WARNING
MAKE SURE OF NO POWER BEFORE DISCONNECTING CIRCUIT. EVEN
SMALL AMOUNT OF CURRENT CAN BE DANGEROUS. DO NOT ATTEMPT A
CURRENT MEASUREMENT WHERE VOLTAGE IS ABOVE 600 V. IF THE
FUSE BLOWS, YOU MIGHT BE INJURED OR THE METER DAMAGED.
(1) Plug the red testleads into the “mAinput” for less than 2000 mA/dc or into “A
input” terminal between 2000mA and 20A.
(2) Plug the black testleads into the COMinput terminal.
(3) Verify dc or ac.Select the function (dc A or ac A) and set the range switch to the
desired volt range. For unknowncurrent,always start from highestrange and move
downto lower range to selectscale for bestreading.
(4) Connectthe probe tips in series with the current sourceto be measured.
(5) Read current value on the Display.
(6) Fuse Replacement
lDisconnect and remove all connections from any live power source.
lOpen the top case.
lLocate the defective fuse and remove it in input board.
lInstall a new fuse of the SAME SIZE AND RATING.
lClose the top case.
** 20 Aac/dc Measurement -“Max .15sec each 15minute”
3-3 Resistance Measurement
Resistance is an obstacle that is hindering the current flowing through a conductor.
Ohm is the unit of this resistance.
lThe resistance displayed in meter is the total resistance through all possible
paths between red and black probes.
lResistance must always be measured with meter in series with the circuit.
lResistance in test lead is about 0.1 -0.2 ohm
lBe sure that the contact between the probes and the circuit is clean. Contact
resistance coming from dirt, oil, paint, etc. can affect accuracy seriously.
CAUTION
ALL RESISTANCE MEASUREMENTS SHOULD BE TAKEN ON DE-

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ENERGIZED CIRCUITS ONLY. COMPLETELY DE-ENERGIZE THE CIRCUIT
OR DEVICE WHICH IS TO BE MEASURED. POWER TO THE CIRCUIT UNDER
TEST MUST BE OFF AND ANY CAPACITORS SHOULD BE DISCHARGED. IF
AN EXTERNAL VOLTAGE IS PRESENT ACROSS A COMPONENT, IT WILL
CAUSE ERRONEOUS RESISTANCE READING.
(1) Plug the red and blacktestleads into the VΩinput and the COMinput terminals
respectively.
(2) Select the function(OHM) and set the range switch to the desired resistance
range.
(3) Connectthe probe tips in parallel with the resistanceto be measured.
(4)Read resistancevalue on the Display.
3-4 Diode Measurement
A good diode allows current in one direction. To test a single diode, turn the power
off and remove the diode from circuit.
(1)Connect the red probe to the plus(+) side of diode and the black probe to the
minus(-) side.
(2)If diode is good, the voltage drop will be displayed. (ex : 300.0 ~ 800.0 )
(3)Reveres the probes and measure the voltage across the diode again.
lIf diode is good, the display shows “000.0”and is flickering.
lIf diode is shorted, the display shows000.0 with beep sound in both direction.
lIf display shows“000.0”and is flickering in both directions, the diode is open.
3-5 Continuity test
Continuity test verifies by beeper if the circuit is closed or open.
Meter detects opens and shorts.
(1)Set the pushswitch to continuity function & diode range.
(2) Connectthe probes to the circuit and listen for beeper. Continuity tone confirms
that the circuit is continued, closed and connected.
3-6 Frequency Measurement
(1) Plug the red and blacktestleads into the VΩinput and the COMinput terminals
respectively.
(2) Select the function to FRQ. and set the range switch to the desired frequency
range. For unknownfrequency,always start from highestrange and move downto
lower range to selectscale for bestreading.
(3) Connectthe probe tips in parallel with the circuit to be measured.
(4)Read frequency value on the Display.

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NOTE ;
The digit error (less than 5digits) is added in measuring value.
To compensate this error, check the digit error by shorting test leads(+,-) before
measuring unknown frequency and deduct this value from measuring value.
4. MAINTENANCE CAUTION
IT IS ESSENTIAL FOR SAFETY TO PROPERLY MAINTAIN AND SERVICE
THIS INSTRUMENT
WARNING
VOLTAGES WITHIN THIS INSTRUMENT ARE SUFFICIENTLY HIGH TO
ENDANGER LIFE. COVERS MUST NOT BE REMOVED EXCEPT BY
PERSONS QUALIFIED AND AUTHORIZED TO DO SO AND THESE PERSONS
SHOULD ALWAYS TAKE EXTREME CARE ONCE THE COVERS HAVE BEEN
REMOVED.
4-1. Fuse Replacement
lDisconnect and remove all connections from any live power source.
lUnscrew fuse holder by screw driver.
lLocate the defective fuse and remove it by gently pulling-out.
lInstall a new fuse of the SAME SIZE AND RATING.
lScrewing fuse holder.
CAUTION
MAKE SURE THAT THE RATED AND SPECIFIED FUSES ARE USED FOR
REPLACEMENT.
4-2. Adjustment And Calibration
It is recommendable to regularly adjust and calibrate this instrument. Qualified and
authorized personnel only should execute performance and procedures.
4-3. Cleaning and decontamination
The instrument can be cleaned with asoft clean cloth to remove any oil, greaseor
grime. Never useliquid solvents or detergents.If the instrument gets wet for any

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reason, drythe instrument using low-pressure clean air at less than 25 PSI. Use
care and caution around the window cover areas where water or air could enter into
the instrument while drying.
Limited One-Year Warranty
B&K Precision Corp. warrants to the original purchaser that its product and the
component parts thereof, will be free from defects in workmanship and materials for
a period of one year from the data of purchase.
B&K Precision Corp. will, without charge, repair or replace, at its’ option, defective
product or component parts. Returned product must be accompanied by proof of
the purchase date in the form a sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by
completing and mailing the enclosed warranty card to B&K Precision Corp., 22820
Savi Ranch Parkway, Yorba Linda, CA 92887 within fifteen (15) days from proof of
purchase.
Exclusions: This warranty does not apply in the event of misuse or abuse of the
product or as a result of unauthorized alternations or repairs. It is void if the serial
number is alternated, defaced or removed.
B&K Precision Corp. shall not be liable for any consequential damages, including
without limitation damages resulting from loss of use. Some states do not allow
limitation of incidental or consequential damages, so the above limitation or
exclusion may not apply to you.
This warranty gives you specific rights and you may have other rights, which vary

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from state-to-state.
Model Number: ______________ Date Purchased:__________
Service Information
Warranty Service:Please return the product in the original packaging with proof of
purchase to the below address. Clearly state in writing the performance problem
and return any leads, connectors and accessories that you are using with the device.
Non-Warranty Service: Return the product in the original packaging to the below
address. Clearly state in writing the performance problem and return any leads,
connectors and accessories that you are using with the device. Customers not on
open account must include payment in the form of a money order or credit card. For
the most current repair charges contact the factory before shipping the product.
Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-
rate repair charge includes return shipping to locations in North America. For
overnight shipments and non-North America shipping fees contact B&K Precision
Corp..
B&K Precision Corp.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
Phone: [phone]
Facsimile: 714-921-6422

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Email: [email protected]
Include with the instrument your complete return shipping address, contact name,
phone number and description of problem.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
USA
TEL: 714
-
921
-
9095

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PN: 481-532-9-001
Printed in Korea
2004 B&K Precision Corp.