1550C/1555
1550C/1555Insulation TesterCalibration ManualSeptember 2010 2010 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice.All product names are trademarks of their respective companies.
Limited Warranty and Limitation of LiabilityEach Fluke product is warranted to be free from defects in material and workmanship under normal use and service. Thewarranty period is three years and begins on the date of shipment. Parts, product repairs, and services are warranted for90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and doesnot apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered,neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants thatsoftware will operate substantially in accordance with its functional specifications for 90 days and that it has beenproperly recorded on non-defective media. Fluke does not warrant that software will be error free or operate withoutinterruption.Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but haveno authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product ispurchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke reservesthe right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country issubmitted for repair in another country.Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, orreplacement of a defective product which is returned to a Fluke authorized service center within the warranty period.To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorizationinformation, then send the product to that service center, with a description of the difficulty, postage and insuranceprepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will bereturned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect,misuse, contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failurescaused by use outside the product’s specified rating, or normal wear and tear of mechanical components, Fluke willprovide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the productwill be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportationcharges (FOB Shipping Point).THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES,EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY ORFITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANYCAUSE OR THEORY.Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation ofincidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If anyprovision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction,such holding will not affect the validity or enforceability of any other provision.Fluke CorporationP.O. Box 9090Everett, WA 98206-9090U.S.A.To register your product, visit http://register.fluke.com.11/99Fluke Europe B.V.P.O. Box 11865602 BD EindhovenThe Netherlands
Table of ContentsTitleIntroduction.How to Contact Fluke .Safety Information .Symbols .Required Equipment .Performance Test Procedures .IR Port Verification Test .Button Test .Display Test.Charging Test .Insulation Accuracy Test .Output Voltage Test .Short Circuit Current Test .Voltage Measurement Accuracy .Adjustment Procedure.Interface Connection .Instrument Setup.Normalizing the HV Probe and Digital Multimeter .HV Adjustment.Current Adjustment .Charge Adjustment.Additional Procedures.Identification (Id).Restart UUT.Shutdown UUT.Get Diagnostics .Query Constants .Save / Print html Page .Battery Replacement Procedure.Disassembly.Re-assembly .Cleaning .Replacement Parts/Accessories .Specifications.General Specifications.Electrical Specifications .Principle of Measurement and Resistance 5161717181819192021
1550C/1555Calibration Manualii
List of TablesTable1.2.3.4.5.6.7.TitleSymbols.Required Equipment.Insulation Accuracy Test.Output Voltage Test .Short Circuit Current Test .Voltage Measurement Test.Replacement Parts .iiiPage451011111218
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List of FiguresFigureTitle1.2.3.4.Pushbuttons .Display Features.IR Port .Query Constant Result .vPage781215
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Introduction WarningTo prevent possible electrical shock, fire, or personal injury: Do not perform the verification tests or calibrationprocedures described in this manual unless qualified to doso. Read all safety Information before you use or service theproduct.The Calibration Manual for the 1550C/1555Insulation Tester (hereafter referred to as"the product") provides the following information. Fluke Contact Information Precautions and Safety Information Performance Test Procedures Adjustment Procedure Battery Replacement Procedure Replaceable Parts/Accessories SpecificationsFor complete operating instructions and additional safety information, refer to the1550C/1555Users Manual located on the CD that came with the product.1
1550C/1555Calibration ManualHow to Contact FlukeTo contact Fluke, call one of the following telephone numbers: Technical Support USA: 1-800-44-FLUKE (1-800-443-5853) Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: 31 402-675-200 Japan: 81-3-3434-0181 Singapore: 65-738-5655 Anywhere in the world: 1-425-446-5500Or, visit Fluke's website at www.fluke.com.To register your product, visit http://register.fluke.com.To see, print, or download the latest manual supplement, ty InformationA Warning identifies conditions and actions that pose hazard(s) to the user; A Cautionidentifies conditions and procedures that could cause Product damage, equipment undertest damage, or permanent loss of data. Warning: Read before product use.To prevent possible electrical shock, fire, or personal injury:2 Read all safety Information before you use the product. Before and after testing, confirm that the product does notindicate the presence of a hazardous voltage, see Figure 2.If the product beeps continuously and a hazardous voltageis shown on the display, remove power from the circuitunder test or allow the installation capacitance to fullydischarge. Use the product only as specified, or the protection suppliedby the product can be compromised. Connect the common test lead before the live test lead andremove the live test lead before the common test lead. Do not disconnect the test leads before a test has beencompleted and the test voltage at the terminals has returnedto zero. This ensures that any charged capacitance is fullydischarged. Disconnect power and discharge all high-voltage capacitorsbefore you measure resistance or capacitance. Do not work alone. Do not use the product around vapor, or in damp or wetenvironments.
Insulation TesterSafety Information Do not use test leads if they are damaged. Examine the testleads for damaged insulation, exposed metal, or if the wearindicator shows. Check test lead continuity. Do not use and disable the product if it is damaged. Do not touch voltages 30 V ac rms, 42 V ac peak, or60 V dc. Keep fingers behind the finger guards on the probes. Do not exceed the Measurement Category (CAT) rating ofthe lowest rated individual component of a product, probe,or accessory. Accessories rated to 1000V CAT III/ 600V CAT IV areintended for hands-free use during insulation testing andare not to be touched while the output of the productexceeds the accessory’s marked rating. Allow the product tofully discharge the installation before removing the testaccessory. Impedances of additional operating circuits connected inparallel can adversely affect measurements. Use the correct terminals, function, and range formeasurements. Do not operate the product with covers removed or the caseopen. Hazardous voltage exposure is possible. Use only specified replacement parts. Do not use the product if the safety shutter is impaired inany way. The safety shutter prevents access to the testterminals and charger terminals at the same time. There are no user replaceable parts inside the product. Use the guard terminal only as specified in this manual. Use only recommended test leads. Do not use in distribution systems with voltages higher than1100 V.3
1550C/1555Calibration ManualSymbolsSymbols on the product and in the manual are explained Table 1.Table 1. SymbolsSymbol Conforms to European Union standards. Canadian Standards Association is the certified body used for testing compliance to safetystandards. Risk of Danger. Important information. See Manual. Hazardous voltage Equipment protected by double or reinforced insulation. Examined and licensed by TÜV Product Services.Do not use in distribution systems with voltages higher than 1100 V.Interference is present. Displayed value might be outside of specified accuracy.Ramp mode indicator Electrical breakdown Volts AC 4MeaningEarth GroundDo not dispose of this product as unsorted municipal waste. Go to Fluke’s website forrecycling information.
Insulation TesterRequired EquipmentRequired EquipmentEquipment required to perform the procedures in this manual is listed inTable 2. If the recommended models are not available, equipment with equivalentspecifications may be substituted. WarningFor safe operation and maintenance of the product, have anapproved technician repair the product. CautionDo not attempt to use the 5500A, 5520A, or other standardcalibrator for insulation and continuity resistance tests.Calibrator damage will result.Table 2. Required EquipmentEquipmentMinimum Required CharacteristicsRecommended ModelHV Probe6 kV, 1 % (1000:1 Divider)11 kV, 2 % for the 1555Fluke 80K-680K-15Digital Multimeter500 mVdc to 1 V: 0.02 %Fluke 85081Load with GuardTerminalResistances200 kΩ, 1.25 %, 500 V500 kΩ, 1.25 %, 500 V1 MΩ, 1.25 %, 1 kV2.5 MΩ, 1.25 %, 2.5 kV5 MΩ, 1.25 %, 5 kV10 MΩ, 1.25 %, 10 kV1 GΩ, 1.25 %, 10 kV100 GΩ, 1.25 %, 10 kV200 GΩ, 1.25 %, 10 kV500 GΩ, 5 %, 10 kV1 TΩ, 5 %, 10 kV2 TΩ, 5 %, 10 kVCombinations of: Welwyn FSeries,Welwyn MFP2 SeriesAnd Vishay HTS-5232Capacitors w/ BleederResistors0.1 μF, 5 %, 500 V, Polypropylene1 μF, 5 %, 2.5 kV, PolypropyleneCalibratorDC current: 2 mAAccuracy: 1.25 %DC Voltage: 0 - 550 VAccuracy: 0.005 %AC Voltage: 0 - 240 V, 60 HzAccuracy: 1.25 %Fluke 5080,Fluke 5520AIR Cable AssemblyFluke P/N 21662753SnorreCalibration SoftwareAmmeterFluke 85085
1550C/1555Calibration ManualEquipmentPersonal computerMinimum Required CharacteristicsRecommended ModelIBM compatible, with Microsoft WindowsXP SP2 or later .NetFramework 2.0 orlater1550C/1555UsersManual CD ROMFluke P/N 35928101. Resistors must have a voltage coefficient consistent with the test voltage used.2. Can use (3) each, 0.033 μF, 2 kV capacitors in series and (8) each, 8 μF, 450 V capacitors in series to obtain requiredvalues. The 0.033 μF capacitors should have a 33 MΩ bleeder resistor across each capacitor. The 8 μF capacitorsshould have a 15 MΩ bleeder resistor across each capacitor.3. Available from www.fluke.com under 1550C/1555 Product Information.Performance Test Procedures WarningTo prevent possible electrical shock, fire, or personal injury, donot contact the output terminals while performing the followingprocedures. There are potentially dangerous voltages at theoutput terminals when the product is in the MΩ TEST function.The following performance tests should be completed yearly to ensure that the product,referred to as “the UUT” (Unit Under Test) in this section of the manual, is in properoperating condition and meets the published accuracy specifications. If the UUT fails anyof the performance test steps, repair or adjustment is needed. Refer to How to ContactFluke for service information.IR Port Verification TestTo verify operation of the IR Communications Port:1. Using a Windows PC, connect the IR adapter cable from the product IR port to thecomputer COM port.2. Activate the Snorre program from the Windows Start menu.3. Select Diagnostic.4. Select Identification(ID). The PC sends out an ID command and the productresponds to it.6
Insulation TesterPerformance Test ProceduresButton TestUse the pushbuttons to control the product, view test results, and scroll through chosentest results. Pushbuttons and their functionality are discussed in Figure 1.FUNCTION12345ENTERTEST67ghh02.epsItemDescription Turns the product off and on. Push to go to the Function menu. Push again to exit the Function menu. To scroll within theFunction menu, use the arrow pushbuttons. Scrolls through test voltages, stored test results, timer duration, and changes test tag IDcharacters. Also used to answer “yes” to yes/no prompts. After a memory location is set, displays the test parameters, test results stored in memory.These include voltage, capacitance, polarization index, dielectric absorption ratio, and current. Use to scroll through test voltages, stored test results, timer duration, and memory locations. Alsoused to answer “no” to yes/no prompts. Use for Test Voltage mode to start incrementally setting the test voltage between 250 V and10,000 V. Starts and stops a test. Push and hold for 1 second to start a test. Push again to stop a test.Figure 1. Pushbuttons7
1550C/1555Calibration ManualDisplay TestTurn the UUT on several times while observing the display during power up. Comparethe display with the example in Figure 2. Check all segments for clarity and contrast.657483921101112gHH03f.EPSItemDescription Interference present. Readings could be out of specified accuracy range. Polarization Index Dielectric Absorption Ratio Electrical breakdown in Ramp mode Ramp mode indicatorPossible hazardous voltage is at the test terminals. Warning: To prevent personal injury, before and after testing,confirm that the product does not indicate thepresence of hazardous voltage. If the product beepscontinuously and there is hazardous voltage,disconnect test leads and remove power from thecircuit under test. Voltage sourced by the product or from the circuit under test at terminals of the product. Test voltage selection (250 V, 500 V, 1000 V, 2500 V, 5000 V, or 10,000 V) Battery charge status Bar graph display of insulation resistance Digital display of insulation resistance Text display. Shows voltage, test current, capacitance, programmable test voltages, and menuoptions.Figure 2. Display Features8
Insulation TesterPerformance Test ProceduresCharging Test1. With the product switched off, connect a mains supply to the ac supply receptacleand check that the UUT display shows Charging.2. Disconnect the mains supply and check that the UUT turns off.3. Turn the product on and see that all the battery symbol segments display as shown inFigure 2.NoteA fully-charged battery is indicated when the battery symbol shows allsegments. Recharge the battery as necessary to obtain all segments. A fullcharge may require 12 hours.Insulation Accuracy TestUsing the various resistances shown in Table 3, perform the UUT insulation accuracytest. Push for 2 seconds to start or discontinue a test. NotesFor best results, allow for settling of up to 60 seconds when measuringhigh-value resistances (100 GΩ and above) and take care to avoidstray currents. Perform the test on a conductive work surface that isconnected to the UUT’s GUARD terminal and the load GUARDterminal.Motion/body capacitance can affect the stability of the reading athigher resistances. When taking the measurements above 1 GΩ, remainas motionless as possible.9
1550C/1555Calibration ManualThe capacitance reading is obtained by pressing after a test has started.Table 3. Insulation Accuracy TestStepVoltage RangeMinimumMaximum1250 V0.1 μF0.0550.1452500 V250 kΩ237 kΩ263 kΩ3500 V1 GΩ0.95 GΩ1.05 GΩ4500 V100 GΩ80 GΩ120 GΩ51 kV1 GΩ0.95 GΩ1.05 GΩ*62.1 kV1 μF0.821.1872.5 kV1 GΩ0.95 GΩ1.05 GΩ85 kV1 GΩ0.95 GΩ1.05 GΩ95 kV100 GΩ95 GΩ105 GΩ105 kV1 TΩ0.80 TΩ1.20 TΩ115 kV5 MΩ4.75 MΩ5.25 MΩ**1210 kV1 GΩ0.95 GΩ1.05 GΩ**1310 KV200 GΩ190 GΩ210 GΩ**1410 KV2 TΩ1.6 TΩ2.4 TΩ**1510 KV10 MΩ9.5 MΩ10.5 MΩ** 1555 only* Use “Programmable Test Voltage” mode by pushing .10UUT Display LimitsResistance
Insulation TesterPerformance Test ProceduresOutput Voltage TestIn Table 4, the UUT output voltage is checked with various loads applied. In this test avoltmeter with a high-voltage probe must be connected to the load resistor to measure theUUT output voltage. Use 15 80K-6 for voltages below 6 kV.Table 4. Output Voltage TestLoad ResistorReading LimitsStepVoltage Range1250 V250 kΩ250 V275 V2250 VNo Load250 V275 V3500 V500 kΩ500 V550 V4500 VNo Load500 V550 V51 kV1 MΩ1000 V1100 V61 kVNo Load1000 V1100 V72.5 kV2.5 MΩ2500 V2750 V82.5 kVNo Load2500 V2750 V95 kV5 MΩ5000 V5500 V105 kVNo Load5000 V5500 V*1110 kVNo Load10000 V11000 V*1210 kV10 MΩ10000 V11000 VMinimumMaximum* 1555 only. Requires 80K-15 probe.Short Circuit Current TestTo verify the UUT short circuit current, use the following procedure:1. Connect an ammeter between the UUT and - terminals.2. Turn the UUT on and allow to startup.3. Wait for Test Voltage to appear on the display and set the test voltage to 5000 V bypushing .4. Push and note that the ammeter reading is within the reading limits referred to inTable 5.5. Push to discontinue the test.Table 5. Short Circuit Current TestUUTVoltage RangeReading LimitsMinimumMaximum1550C5000 V1.20 mA1.80 mA155510000 V1.20 mA1.80 mA11
1550C/1555Calibration ManualVoltage Measurement AccuracyTo verify voltage measurement accuracy of the Live Circuit Warning function, apply thevoltages listed in Table 6 to the and - terminals of the UUT. Verify that: The UUT reading is within the display limits of Table 6. The UUT is beeping at a 1-second interval. is flashing on the display.Table 6. Voltage Measurement TestVoltage SourceOutputStepUUT DisplayUUT ToneUUT Display LimitsMinimumMaximum1-34 VdcFlashing HazardBeeps29 V39 V2240 Vac, 60 HzFlashing HazardBeeps204 V276 VAdjustment ProcedureThe product should be performance tested yearly to ensure compliance with itsspecifications. When required, use the following adjustment procedure to bring the UUTwithin its nominal accuracy specifications.Interface ConnectionPerform adjustment with software using a computer and IR (infrared) adapter.Connect the Infrared Cable Assembly to the UUT IR Port and COM port of the computer.Refer to Figure 3.12ghh04.epsItemDescription IR Port IR DeviceFigure 3. IR Port12
Insulation TesterAdjustment ProcedureInstrument SetupTurn the product on and wait for Test Voltage to appear on the display. From thecomputer terminal, activate the Snorre program from the Windows Start menu. On theSetup tab, confirm the selected COM port settings. WarningTo prevent possible electrical shock, fire, or personal injury, donot contact the output terminals or test equipment terminalswhile performing the following procedures. There arepotentially dangerous voltages when the UUT is in the"Calibrate HV Output and Measurement" mode.Normalizing the HV Probe and Digital Multimeter1. Connect the HV probe and digital multimeter to the 5520A NORMAL outputterminals, observing polarity. Manually set the multimeter for a range that has a10 MΩ input impedance (e.g., 100 V) and provides a maximum resolution for a500 mV and 5000 mV input.2. Set the 5520A output to 506 V and note the digital multimeter reading. Record thisvalue.3. Set the 5520A output to 1000 V and note the voltmeter reading. If the error is 0.025 % from the nominal value, convert the error from nominal to percentage.Multiply 5005 V by this percentage and algebraically add to 5005 V. Record thisvalue.4. Set the 5520A to standby and disconnect the HV probe and digital multimeter.HV Adjustment1. Select the CAL HV tab.2. Connect the HV probe and digital multimeter to the output terminals of the UUT, asshown in the connection diagram.3. Press the START button to begin adjustment. The UUT briefly displays HVOFFSET then flashes with PWM 600, while emitting a beep at 1-secondintervals.4. Use and on the terminal to modify the UUT output value to as close aspossible to the value recorded in step 2 of “Normalizing the HV Probe and DigitalMultimeter”. The nominal value for this adjustment is between 502 and 510 V.5. Press the Cal 500 button. The UUT now increases its output of the 1550C tonominally 5000 V, the output of the 1555 goes to a nominal 10,000 V.6. Use and on the terminal to modify the UUT output value to as close aspossible to the value obtained in step 3 of “Normalizing the HV Probe and DigitalMultimeter”. The nominal value for the 1550C adjustment is between 5000 V and5010 V, the target range for the 1555 adjustment is 10,000 V and 10,020 V.7. Press the Cal 500 button. The HV generation and measurement functions are nowcalibrated.8. Disconnect the HV probe and digital multimeter from the UUT.13
1550C/1555Calibration ManualCurrent Adjustment1. Select the Cal Current tab.2. Attach a 2 mA current source to the LO and GUARD terminals of the UUT,connecting the current source LO to UUT GUARD terminal, as shown in theconnection diagram.3. Apply 2 mAdc to the UUT.4. Press the START button and wait until the adjustment is complete.5. The current measurement is now adjusted. Disconnect the current source.Charge Adjustment1. Select the Cal Charge tab.2. Attach a 2 mA current source to the LO and GUARD terminals of the UUT,connecting the current source LO to UUT Guard.3. Apply 2 mAdc to the UUT.4. Press the Start button and wait until the adjustment is complete; progress isdisplayed.5. The charge measurement is now adjusted. Set the current source to STANDBY anddisconnect it from the UUT.This completes the Adjustment Procedure.Additional ProceduresNoteThe following additional procedures are used during factory calibrationand repair but should not be performed in the field. They are included forinformation only.Various diagnostics are available from the Diagnostic tab as follows:Identification (Id)This button installs the default opvars in the UUT; the present calibration is lost as theopvars are overwritten with the defaults. The user is presented with a YES/NO dialogbox, to prevent accidental selection of this option.Restart UUTThis button first sets the UUT to CAL DIAGS mode the sends out the restart hardwarecommand. The UUT is then restarted.Shutdown UUTThis button puts the UUT into CAL DIAGS mode and sends out the powerdowncommand.14
Insulation TesterAdditional ProceduresGet DiagnosticsPressing this button continually gets Raw ADC values from the UUT and updates theRaw ADC Counts boxes (v counts, i counts, q counts), pressing the button again turnsthis feature off.Query ConstantsPressing this button provides an html screen dump of the present opvars obtained fromthe UUT. You will need to check that numerical values are reported for all nine variables.See Figure 4.Figure 4. Query Constant Resultsnorre 3.bmpSave / Print html PageThe Save button brings up a Windows Save Dialog Box so that the html document beingdisplayed can be saved to file.The Print button brings up a Windows Print Dialog Box so that the rendered htmldocument may be printed.The window at the bottom of the page is a scrollable log of the Snorre methods issuingcommands to the UUT and the corresponding responses received back from the UUT.15
static awarenessA Message FromFluke CorporationSome semiconductors and custom IC's can bedamaged by electrostatic discharge duringhandling. This notice explains how you canminimize the chances of destroying such devicesby:1. Knowing that there is a problem.2. Learning the guidelines for handling them.3. Using the procedures, packaging, andbench techniques that are recommended.The following practices should be followed to minimize damage to S.S. (static sensitive) devices.1. MINIMIZE HANDLING2. KEEP PARTS IN ORIGINAL CONTAINERSUNTIL READY FOR USE.3. DISCHARGE PERSONAL STATIC BEFOREHANDLING DEVICES. USE A HIGH RESISTANCE GROUNDING WRIST STRAP.4. HANDLE S.S. DEVICES BY THE BODY.
5. USE STATIC SHIELDING CONTAINERS FORHANDLING AND TRANSPORT.8. WHEN REMOVING PLUG-IN ASSEMBLIESHANDLE ONLY BY NON-CONDUCTIVEEDGES AND NEVER TOUCH OPEN EDGECONNECTOR EXCEPT AT STATIC-FREEWORK STATION. PLACING SHORTINGSTRIPS ON EDGE CONNECTOR HELPSPROTECT INSTALLED S.S. DEVICES.6. DO NOT SLIDE S.S. DEVICES OVERANY SURFACE.9. HANDLE S.S. DEVICES ONLY AT ASTATIC-FREE WORK STATION.10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED.11. ONLY GROUNDED-TIP SOLDERINGIRONS SHOULD BE USED.7. AVOID PLASTIC,VINYL AND STYROFOAM IN WORK AREA.PORTIONS REPRINTEDWITH PERMISSION FROM TEKTRONIX INC.AND GERNER DYNAMICS, POMONA DIV. Dow Chemical
1550C/1555Calibration ManualBattery Replacement Procedure WarningFor safe operation and maintenance of the product: Batteries contain hazardous chemicals
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or . Fluke 5080, Fluke 5520A IR Cable Assembly Fluke P/N 2166275 3Calibration Software Snorre Ammeter
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