2831C

lnstructionManual Model2831C3 llzDigitBenchTypeDigitalMultimeter TESTINSTRUMENT SAFETY WARNINGI An electricalshockcausingl0 milliampsof currentto passthroulh the heartwill stopmosthumanheartbeats. Voltageas low as35 volts dc or ac rmsshouldbe considereddangerous andhazardotrs sinceit canproduiea fatal cgrrentgndercertainconditions. Highervoltagesareevenmoredangerous. Observethe following safetyprecautions: l. Do not exceedthe following inputratings.Personalinjury or damageto the instrumentmay result. DC VOLTS (Range2v-lkv) 1200V (dc + ac$eak) DC VOLTS(Range200mv)750V(dc+acpk) AC VOLTS (Range2V-lkv) 1000V rms AC VOLTS(Range200mv)750Vrms OHMS 450 V dc or acnns 2 0 0 1 t A * 2A 2 A (fuseprotected) 204 20 A (untused) COM Do not float morethan500 volts from earthsround. 2. Remove test leads ffom the instrument and point of measurementbefore replacing fuses or performing any servicing on the multimeter. 3. Use only shroudedsafetytype test leadslike those supplied.Periodicallyinspectinsulationfor any burns,cuts, or breaks. Never use test leadswith exposedbarewires or poor insulation. 4. Turn offequipment while making test comections in high-voltaggcircuits. Dischargehigh-voltage capacitorsafter removing power. 5. For voltageor currentmeaswementsin high voltage equipment,do not touch equipment,meter,or test leadswhile power is applied. 6. If possible,famlliarizeyourself with the equipmentbeing testedand the location of its high voltagepoints. However, remember that high voltage may appearat unexpectedpoints in d6fective equipment. 7. Use an insulatedfloor material or floor mat to standon, and an in5ulatedwork benchsurface:make certain such surfacesare not damp or wet. (continuedon inside back cover) Instruction Manual for Model2831C BenchType Digit 3-112 MULTIMETER KKPRECilsffEJ 1031SegoviaCircle,Placentia CA 92870 TABLEOF CONTENTS Page TEST INSTRUMENT SAFETY INTRODUCTION. SPECIFICATIONS. . Inside Front Cover .......I Page C u r r e n t M e a s u r e m. e. .n t s ResistanceMeasurem . . e. n t s ContinuityTesting D i o d e T e s t i n. .g. ..........9 .......9 ....10 ....10 .......2 OPTIONALACCESSORIES... .........5 CONTROLSANDINDICATORS ......,.6 CONTROLSANDINDICATORS ........7 OPERATINGINSTRUCTIONS.. Preliminary VoltageMeasurements ........8 .....8 ........8 M I { T N T E N A N C.E . huseReplacement lineVoltageSelection f,estleads InstrumentRepairService ...... II ....11 .......12 .....12 .....12 W A R R A N T YS E R V I C E I N S T R U C T I O N S . . .....14 LIMITEDONE-YEARWARRANTY.... .......15 INTRODUCTION The B & K Precision Model 28318 bench-type3-ll2 digit multimeter is a highly versatile instrument offering standard functions of voltage, current (with a 20 A range), and resistancemeasurements.[n addition, it also includes diode test and continuity functions. The instrument is easy to use, as all functions are selectedfrom a panel of very logically laid out and identified pushbuttons. The 3-ll2 digit LED display features 0.43"' digits with automaticminus sign and auto-zerocapability. The unit is housed in a rugged, attractiveplastic case,and the carrying handle doublesas a sturdy tilt stand.The tilt standcan be folded on top of the instrument to allow stacking with your other instrument. Safety features include safety jacks, safety test leads, and extensiveoverloadprotection,including a high energy fuse. B & K Precision offers a full line of optional accessories for the Model 28318 which can further expand the capabilities and usefulnessof the instrument. Please contact your locai B & K Precision distributor or B & K Precision for more information on the latestaccessories. SPECIFICATIONS All accuracies specifiedat23"C + 5 oC,757omaximum relative humidity. TRIIE RMS: FROM lE/o tD 10V/oOF RANGE DC VOLTAGE RANGE 200mV MAXIMUM INDICATION t199.9mV 2V 1 1 . 9 9 9V 20v + 1 9 . 9V 9 200v 1200v 1 1 9 9 . 9V AC VOLTAGE ACCURACY MAX INPUT 750V (dc+ac peak) !(O.1o/oof reading + 1 count) All ranges 1200v I/IAXIMUM RANGE INDICATIONFREQENCY 200mV 2V 50 dB minimum at 50160Hz. Common mode rejection: 120 dB minimum at dc and 50160Hz with I kO unbalance. I second. Input Impedance: 10 MO. 4or-tsb1Kt-b(0.5% of rdg+acnbl 1KFLto10KJ-L(2/o of tdgr/"0 7 B 9 Fig. 1. Controls and indicators ,7 OPERATINGINSTRUCTIONS VOLTAGE MEASUREMENTS Use of test equipment mqy expose the operator to electric shock hazards. Observe all instructions contained in the TEST INSTRUMENT SAFETY section of this manual Before using this instrument. l. Pressthe V function switch. 2. Selectac or dc measurementusing the AC/DC switch. Set for dc nreasurementby setting switch to disengaged("out ") position. Pushswitch "in" for ac measurement. 3. If the voltage to be measuredis unknown, start with the 1200VDC/I000 VAC range. The TEST INSTRUMENT SAFETY section of this manual lists maximum voltage and current input limits which must be observed. Failure to adhere to these limits may result in damage to the instrument. PRELIMINARY Plug the unit into an ac outlet of the appropriatevoltage and turn it on by depressingthe POWER switch. 4.lf an approximatevoltagerangeis known, simply pressthe switch for the range desired. Greatestresolution is attained using the range closest to an over range for the voltage being measured. 5. Connectthe red test leadto the V-O jack and the black test lead to the COM jack. 6. Connect the test leads across the circuit noints to be measured. 7. Read the measuredvalue from the display. OPERATINGINSTRUCTIONS CURR E N M T EA S U R E ME N T S For current meqsurements,the meter must be connected in series wilh the load. If incorrectly connected (in parallel with the load), the meter presents a very low impedance (almost a short), which may blow the fuse or damage the meter or equipment under test. The 20 A range has on fuse protection and moy severely damage the meter or equipment under test or cause personal injury. For current meesurementsgreater thun 2 A, high curent test leads should be used. High current measurements with standard test leads could cause the leads to heat up. This nol only affects the accuracy of the meqsurement, but could result in injury to the operator. 1. Pressthe A function switch. 2. Selectac or dc measurementusing the AC/DC switch. Set for "out" position. Push dc measurementby setting switch to "in" for ac measurement. switch 3. If the current to be measuredis unknown. start with the meter in the 20 A range,using the 20 A jack. If the expectedcurrent might exceed2 A, use high current test leads. s 4.lf m approximatecurrent range is known, simply press the switch for the rangedesired.Greatestresolutionis attainedusing the rangeclosestto an overange for the current being measured. a. For current measurementsof 2 A or less,connect the red test leadto the 2 A jack and the black test lead to the COM jack. greaterthan2 A, connectared high b. For curent measurements current test lead to the 20 Ajack and connectablack high cuftent testlead to the COM jack. 5. Remove power from the circuit rurdermeasurementand openthe normal circuit path where the measurement is to be taken. Connectthe metsr in serleswith the circuit. 6. Apply porverto the circuit and read the measuredvalue on the display. MEASUREMENTS RESISTANCE L Remove power from the equipmentunder test. 2. Pressthe fJ function switch. 3. Connect the red test lead to the V -O jack and black test lead to the COM jack. The red lead is (+) polarity. 4. Connectthe test leadsto the desiredpoint of measurement and observethe readingon the display. 5. If the expectedresistancerange is unknown, start with the lowest range. If an overrange is indicated, continue selecting higher ranges until the overrange indication ceases.At this range,greatestresolutionis achieved. O PE R A T I N GI N S T R U C T ION S CONTINUITYTESTING DIODETESTING l. Remove power from the equipmentundertest. 1. Pressthe Q switch. 2. Pressthe O switch. 2. Pressthe 2 K switch. 3. Select both 200 Q and 2 KC) resistanceranges (press both 200 and 2 K switchessimultaneously). 3. Connectthe red test lead to the V -fi jack and the black test lead to the COM jack. The red lead is (+) polarity. The meter usesconventional-currentleadpolarity for diode testing (i.e. current flow assumedfrom positive-to-negative). 4. Connectthe red test lead to the V -Ojack and the black test lead to the COM jack. The red lead is (+) polarity. 4. To check diode forward voltage(Vr), connectthe red test leadto the anode and the black test lead to the cathode. Diodes and semiconductorjunctions with normal V, of lessthan 2.0 V can be checked. 5. Connectthe test leadsto the desiredmeasruementpoints. 6. If the resistancebetweenthe two points is less than 10 ohms (tlpical), the continuity tone will sound. 7. Disengaging one of the two switches (200 O and 2 KC) switch at "out" position) will disable the continuity tone. The instrument will then be operating in standard ohms mode. 5. The display indicates diode forward voltage. Normal diode voltagesare approximately0.3 V for germaniumdiodes,0.6 V for silicon devices,and 1.6V for light emitting diode (LED's). An overrange indicates an open diode. A shorted diode reads near0 V. 6. To checkthe reverse-bias conditionofa diode,reversethe testlead connectionsto the device. The readingshould be the sameas with open test leads (an overrange). A lower reading indicates a leakydiode. l0 MAINTENANCE GurrentRangeFuse Note: The fuse most likely to open first can be inspectedand changedwithout caseremoval. It is locatedon the rear panel of the unit. Simply use a flat blade screwdriver to rotate the terminalcounterclockwise. The following instructions are for use by qualified service personnel only. To avoid electrical shock, de not perform servicing other than contained in the operating instructions unlessyou are qualified to do so. Remember that ac line voltage is present on line voltage input circuits any time the instrument is plugged into an ac outlet, even if turned off. Always unplug the unit before perforning servicing procedures. Then remove the entire assembly,including the fuse. If this fLse is blown, replace it with the appropriate2 A,250 V, 5 x 20 mm fastblow firse @art number 196-300-2-000). Then replace the fineholder. l I ! PowerSupplyFuse If your unit does not operate at all (no digits lit), check power supply fi4e (See Fig. 2) . Note: This fuse should not open unless FUSE REPLACEMENT some defect occurs in the instrument, Replace it only after There are two fuses in the unit - one for the mA current investigation of the reasonfor its opening.Use the appropriatevalue: range and one for the main power supply. If your unit continpes 0.25 A, 250 V, fast-blow Sart number 196-300-0-250) for to operate(digits lit) but fails to measurecurrent, check the two 100/120V operatiorl or 125 mA, 250 V, fast-blow (part number current fuses. I 96-300-0-I 25\ for 220/240V operation. . ll MAINTENANCE TEST LEADS LINE V9LTAGE SELEGTI9N charge fuse. Periodically examine the test leads to ensure that the conductorsare not intermittentor broken..Also make surethat good contactpressureexists at the test lead receptacles.Keep these areas free from dirt and corrosion. Use shrouded safeW type replacementtest leads. l. Extract the tuse drawer from the AC socketwith the aid INSTRUMENT of a screwdrive(The extra safe fuse drawer can only be Becauseof the specializedskills and test equipment required for inskument repair and calibration' many customers prefer to rely upon B & k Precision for this service. We maintain a network of B & K Precision authorized service agenciesfor this purpose. To use this service, even if the instrument is no longer under warranty, follow the instructions given in the WARRANTY SERVICE INSTRUCTIONS section of this is a nominal charge for instruments out of T;;Xl*.tn"re This instrumentis the universal line operation: 100V, 120V, 220y and240v. The below is explaining the user how to ' . extracted with the aid of a flat blade scre\4'qrlver') 2. Pull out the fuse from the fuse holder and chargethe fuse rating in accordancewith specific required' 3. Plugging fuse holder into the Line voltage indication shown on the fuse drawer is correct. Rotating the fuse holder before insert fuse drawer to have correct voltase indication. 4. Install the fuse drawer into AC sollect. t2 REPAIR SERVICE n ru'trff Fust lB 6 996p159 O,|intfI r'UI FIJST ,/:\ l r i \ l t\,4'I CAUTION tLi ls oscol|rffi PilER cso BEF0RIRtuo\,$6covER RtrtR r0 ol{rnD $Fllct Fttsofn€r.. llrs EouFil€r{rLJsT tr[rHED. r I \=/ n RfPuct FUst GL 6 5pgggl5p 2 25(ry "e u" -'A Mlll v1c1ru"" (B)Fusedrorer l3 (D)Fuse rink Fhln'eiusel Holder rilh voltoge selector Iiio.qe-ncPowersource| WARRANTYSERVICEINSTRUCTIONS Warranty Service: Pleaseretum the product in the original packaging with proof of purchaseto the below address.Clearly state in writing the performance problem and retum any leads, comectors and accessoriesthat you are using with the device. Contact B&K Precisionto obtain a Return Authorization number before shipping the product to B&K. The RA number must appear on the addresslabel. Non-Warranty Service: Return the product in the original packaging to the below address. Clearly state in writing the performanceproblem and return any leads,connectorsand accessoribs that you are using with the device.Customersnot on open account must include payment in the form of a money order or credit card. For the most current repair chargescontact the factory before shipping the product. Contact B&K Precision to obtain a Rdturn Authorization number before shipping the product to B&K. The RA number must appear on the addresslabel. Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-rate repair charge includes return shipping to locationsin North America. For overnight shipmentsand non-North America shipping feescontactB&K Precision Corp.. B&K Precision Corp. 1031 Segovia Circle Placentia, C492870 www.bkprecision.com Phone: 714-237-9220 Facsimile: 714-237-9214 Email: service@bkprecision.com Include with the instrumentyour complete return shipping address,contact name, phone number and descriptionof problem. l4 WARRANTY LTMITED ONE-YEAR 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 date of purchase. B&K Precision Corp. will without charge, repair or replace, at its' option, defective product or component parts. Returned product must be accompaniedby proof of the purchasedatein the form a salesreceipt. To obtain warranty coveragein the U.S.A., this product must be registeredby completingand mailing the enclosedwarranty card to B&K Precision Corp., l03l SegoviaCircle, Placentia,CA92870 within fifteen (15) days flom proof of purchase. Exclusions: This warranty does not apply in the event pf misuse or abuse of the product or as a result of unauthorized alternations or repairs. It is void if the serial number is qlternated, defaced or removed. B&K Precision Corp. shall not be liable for any consequintial damages,including without limitation damagesresulting from loss of use. Some statesdo not allow limitation of incidentalor consequentialdamages,so the above limitation or exclusionmay not apply to you. This warranty gives you specific rights and you may have other rights, which vary from state-to-state. 15 TESTINSTRUMENT SAFEW (continued from inside front cover) 8. Keep "one hand in the pocket" while handing an instrument probe. Be particularly careful to avoid contacting a nearby metal object that could provide a good ground rehrrn path. 9. When using a probe, touch only the insulatedportion.Never touch the exposedtip portion. "hot chassis"type. This lO.Someequipmentwith a two-wire ac power cord, including some with polarizedpower plugs, is the includes most recent television receiversand audio eqgipment.A plastic or wooden cabinet insulatesthe chassisto protect the customer. When the cabinet is removed for servicipg, a serious shock hazard exists if the chassis is touched. Not only does this present a dangerousshock hazard, but damaggto test instruments or the equipment under test may result. To make measurementsin "hot chassis" equipment, always cofflect an isolation transformer between the ac outlet and the equipment under test. The B & K Precision Model TR-l10 or l6Q4 Isolation Transformer,or Model 1653 or l655AC Power Supply is "hot chassis"unlessyou suitable for most applications.To be on the safe side, peat all two-wire ac powered equipmentas are sure it has an isolated chassisor an earth ground chtissis. l1.B & K Precision products are not authorizedfor use in any application involving direct contactbetween our product and "direct contact" refers to any the human body, or for use as a critical component in ja life support device or system. Here, "critical component of a life support device or connection from or to our equipment via any cabling op switching means.A system whose failure to perform can be reasonably expectedto cause failure ofthat device or system, or to affect its safety or effectiveness. l2.When testing ac powered equipment,rememberthat aq line voltage is usually presenton some power input circuits such as on-off switch, fuses, power transformer, etc. any time the equipment is connectedto an ac outlet, even if the equipment is tumed off. 13.Neverwork alone. Someoneshould be nearby to renderaid if necessary.Training in CPR (cardio-pulmonaryresuscitation) first aid is highly recommended. PAtr:481-316-9-001 Printedin Taiwan @ 19998&KPrecisionCorp. 1031Segovia Circle Placentia, CA 92870-7137 USA TEL:714-237-9220 F pd,.714-237-9214 www.bkprecision.com