( Read First: Safety InformationSymbolsInput JacksAutorangeManual RangeAutomatic Touch Hold( ModeBar GraphStandbyAC and DC Voltage (( ( m()Resistance (()Diode Test (()Continuity Test ( ( )Current (( ()Probe HolderMaintenanceSpecifications77/75/23/21 English Instruction SheetPage 1®77/75/23/21Series III MultimeterInstruction SheetW Read First: Safety Information• Never use the meter if the meter or test leads look damaged.• Be sure the test leads and switch are in the correct position forthe desired measurement.• Never measure resistance in a circuit when power is applied.• Never touch the probes to a voltage source when the testleads are plugged into the 10 A or 300 mA input jack.• Never apply more than the rated voltage between any inputjack and earth ground.• Be careful when working with voltages above 60 V dc or 30 Vac rms. Such voltages pose a shock hazard.• Keep your fingers behind the finger guards on the test probeswhen making measurements.WWarningTo avoid false readings, which could lead topossible electric shock or personal injury, replacethe battery as soon as the battery indicator (M)appears.SymbolsWRead First: Safety InformationYDangerous Voltage May Be PresentTDouble InsulationOvervoltage Installation Category per IEC 1010:CAT IICAT IIITypical locations include; main wall outlets,local appliances, and portable equipment.Typical locations include switches in the fixedinstallation and equipment for industrial usepermanently connected to the fixed installation.PN 650512 August 1997 Rev.2, 7/98 1997, 1998 Fluke Corporation. All rights reserved. Printed in U.S.A.All product names are trademarks of their respective companies77/75/23/21 English Instruction SheetPage 2Input JacksV600V1000VFUSEDCAT CAT Volts, Ohms, Diode TestCommon TerminalAmpMilliamphc1f.epsSee Specifications for overload protection.AutorangeThe meter defaults to autorange when you turn on the meter.Manual RangeManual ranging is available in V ac, V dc, ohms, A ac, and A dc.RANGECAT CAT +_RANGEMANUAL MANUAL Momentaryhc11f.epsTo return to autorange, press for 1 second or turn therotary switch.77/75/23/21 English Instruction SheetPage 3Automatic Touch Hold ModeW WarningTo avoid electric shock, do not use the Touch Holdmode to determine if a circuit with high voltage isdead. The Touch Hold mode will not captureunstable or noisy readings.The Touch Hold mode automatically captures and displaysstable readings for all functions.Single BeepRANGE+__RANGE+_RANGECAT CAT +HOLDHOLDHOLD HOLDAUTO MomentaryHOLDV V Vhc4f.epsWhen the meter captures new input, it beeps and a new readingis displayed.NoteStray voltages can produce a new reading.To exit the Touch Hold mode, press momentarily orturn the rotary switch.Bar GraphThe bar graph shows readings relative to the full scale value ofthe displayed measurement range and indicates polarity.hc15f.eps77/75/23/21 English Instruction SheetPage 4StandbyIf the meter is on but is inactive for an hour (20 minutes in diodetest), the display goes blank and displays four bar graphsegments. To resume operation, turn the rotary switch or press abutton.AC and DC Voltage (K L mL)RANGECAT CAT +__RANGECAT CAT +_RANGECAT CAT +Volts ACVolts DC Millivolts DCVVmVhc3f.epsResistance (e)Turn off the power and discharge all capacitors. An externalvoltage across a component will give invalid resistance readings.RANGECAT CAT +_hc7f.eps77/75/23/21 English Instruction SheetPage 5Diode Test (G)RANGECAT +__Forward BiasSingle BeepRANGECAT CAT +Reverse Bias_RANGECAT CAT +ShortedOpenandGood Diode Good DiodeBad Diode_RANGECAT CAT +Bad Diodehc5f.eps77/75/23/21 English Instruction SheetPage 6Continuity Test ( R )RANGECAT CAT +_RANGECAT CAT +_hc8f.epsIf continuity exists (resistance < 210 Ω for Models 21/75 and<270 Ω for Models 23/77), the beeper sounds continuously. Themeter beeps twice if it is in Touch Hold mode.Current (? A)W WarningTo avoid injury, do not attempt a currentmeasurement if the open circuit voltage exceeds therated voltage of the meter.To avoid blowing an input fuse, use the 10 A jack until you aresure that the current is less than 300 mA.Turn off power to the circuit. Break the circuit. (For circuits ofmore than 10 amps, use a current clamp.) Put the meter in serieswith the circuit as shown and turn power on.RANGE_CAT CAT ++1243Ahc10f.eps77/75/23/21 English Instruction SheetPage 7Probe Holderhc14f.epsMaintenanceW WarningTo avoid electric shock, remove the test leadsbefore opening the case, and close the case beforeusing the meter. To prevent fire and possible arc-flash, use fuses with ratings shown on the back ofthe meter.CautionTo avoid contamination or static damage, do nottouch the circuit board without proper staticprotection.Internal Fuse TestRANGE10 A 300 mA Ω <.5Ω 4-8OKOKOKOKhc9f.eps77/75/23/21 English Instruction SheetPage 8Battery ReplacementNoteBefore opening the case, make sure the test leads areremoved and the rotary switch is turned to OFF.hc12f.epsFuse ReplacementF2F2F1F123/77 21/75hc13f.epsCleaningTo clean the meter, use a damp cloth and mild detergent; do notuse abrasives or solvents on the meter.77/75/23/21 English Instruction SheetPage 9Service and PartsTo contact Fluke, call one of the following telephone numbers:USA and Canada: 1-888-99-FLUKE (1-888-993-5853)Europe: +31 402-678-200Japan: +81-3-3434-0181Singapore: +65-*-276-6196Anywhere in the world: +1-425-356-5500Or, visit Fluke’s Web site at www.fluke.com.Item Description FlukePNQuan.BT1 Battery, 9 V, NEDA 1604/IEC 6F22, or NEDA 1604A/IEC 6LR616965346144871F1*Models 21/75:Fuse, F630 mA, 250 V, Min InterruptRating 1500 A or IEC 127-1740670 1F2* Fuse, F11 A, 1000 VAC/DC,Min Interrupt Rating 17 kA943118 1F1*Models 23/77:Fuse, F44/100 A, 1000 VAC/DC,Min Interrupt Rating 10 kA943121 1F2* Fuse, F11 A, 1000 VAC/DC,Min Interrupt Rating 17 kA943118 1* For safety, use exact replacementSpecificationsAccuracy is specified for a period of one year after calibration, at18°C to 28°C (64°F to 82°F) with relative humidity to 90%. ACconversions are ac-coupled, average responding, and calibratedto the RMS value of a sine wave input.Accuracy specifications are given as:±([% of reading] + [number of least significant digits])Maximum Voltage Betweenany Terminal and EarthGroundRated voltageDisplay Digital: 3,200 counts, updates 2.5/secAnalog: 31 segments, updates 25/secResponse Time of DigitalDisplayV ac < 2 sV dc < 1 sΩ < 1s to 320 kΩ, < 2s to 3.2 MΩ,< 10 s