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Fluke 21 Instruction Sheet

Fluke tool storage user manual
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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 for
the desired measurement.
Never measure resistance in a circuit when power is applied.
Never touch the probes to a voltage source when the test
leads are plugged into the 10 A or 300 mA input jack.
Never apply more than the rated voltage between any input
jack and earth ground.
Be careful when working with voltages above 60 V dc or 30 V
ac rms. Such voltages pose a shock hazard.
Keep your fingers behind the finger guards on the test probes
when making measurements.
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator (
Overvoltage Installation Category per IEC 1010:
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 companies
Series III Multimeter
Read First: Safety Information
Dangerous Voltage May Be Present
Double Insulation
Typical locations include; main wall outlets,
local appliances, and portable equipment.
Typical locations include switches in the fixed
installation and equipment for industrial use
permanently connected to the fixed installation.
Instruction Sheet



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  Summary of Contents for Fluke 21

  • Page 1 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 companies 77/75/23/21 Series III Multimeter...
  • Page 2 Input Jacks Milliamp See Specifications for overload protection. Autorange The meter defaults to autorange when you turn on the meter. Manual Range Manual ranging is available in V ac, V dc, ohms, A ac, and A dc. MANUAL MANUAL RANGE RANGE Momentary To return to autorange, press...
  • Page 3 Automatic Touch Hold Mode To avoid electric shock, do not use the Touch Hold mode to determine if a circuit with high voltage is dead. The Touch Hold mode will not capture unstable or noisy readings. The Touch Hold mode automatically captures and displays stable readings for all functions.
  • Page 4 Standby If the meter is on but is inactive for an hour (20 minutes in diode test), the display goes blank and displays four bar graph segments. To resume operation, turn the rotary switch or press a button. AC and DC Voltage ( Volts AC RANGE Resistance ( )
  • Page 5 Diode Test ( Good Diode RANGE Forward Bias Bad Diode RANGE Open Single Beep Good Diode RANGE Reverse Bias Bad Diode RANGE Shorted hc5f.eps...
  • Page 6 Turn off power to the circuit. Break the circuit. (For circuits of more than 10 amps, use a current clamp.) Put the meter in series with the circuit as shown and turn power on. Warning RANGE for Models 21/75 and RANGE hc8f.eps hc10f.eps...
  • Page 7 Probe Holder Maintenance To avoid electric shock, remove the test leads before opening the case, and close the case before using the meter. To prevent fire and possible arc- flash, use fuses with ratings shown on the back of the meter. To avoid contamination or static damage, do not touch the circuit board without proper static protection.
  • Page 8 Before opening the case, make sure the test leads are removed and the rotary switch is turned to OFF. Fuse Replacement 23/77 Cleaning To clean the meter, use a damp cloth and mild detergent; do not use abrasives or solvents on the meter. Note hc12f.eps 21/75 hc13f.eps...
  • Page 9 Service and Parts To contact Fluke, call one of the following telephone numbers: USA and Canada: 1-888-99-FLUKE (1-888-993-5853) Europe: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65- Anywhere in the world: +1-425-356-5500 Or, visit Fluke’s Web site at Item Battery, 9 V, NEDA 1604/IEC 6F22, or...
  • Page 10 3.7 cm x 8.9 - 7.8 cm x 19 cm (1.5 in x 3.5 - 3.1 in x 7.49 in) 365 g (12.9 oz) Models 21/75 Series III: 600 V CAT III, Models 23/77 Series III: 600 V CAT III and 1000 V CAT II per ANSI/ISA S82.01-1994, EN 61010-1: 1993, CSA...
  • Page 11 10.00 A * * 10 A continuous, 20 A for 30 seconds maximum. Range 3.200 V, 32.00 V, 320.0 V 600 V (21/75), 1000 V (23/77) 320.0 mV 3.200 V, 32.00 V, 320.0 V 600 V (21/75), 1000 V (23/77) 320.0...
  • Page 12 <3.1 V dc Unbalanced) >60 dB at 50 Hz or 60 Hz To 3.2 M <440 mV dc <420 mV dc (typical) Short Circuit Current (typical) 21/75: 400 A 500 A 21/75: 0.0 V 0.5 mA 0.6 V 0.4 mA 1.2 V...