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77/75/23/21 English Instruction Sheet

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77/75/23/21

Series III Multimeter

Instruction Sheet

WRead 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.

WWarning

To avoid false readings, which could lead to

possible electric shock or personal injury, replace

the battery as soon as the battery indicator (M)

appears.

Symbols

WRead First: Safety Information

YDangerous Voltage May Be Present

TDouble Insulation

Overvoltage Installation Category per IEC 1010:

CAT II

CAT III

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.

PN 650512 August 1997 Rev.2, 7/98

All product names are trademarks of their respective companies

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77/75/23/21 English Instruction Sheet

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Input Jacks

600V

1000V

FUSED

CAT

Volts, Ohms,

Diode Test

Common

Terminal

Amp

Milliamp

hc1f.eps

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.

RANGE

CAT

RANGE

MANUAL

Momentary

hc11f.eps

To return to autorange, press for 1 second or turn the

rotary switch.

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77/75/23/21 English Instruction Sheet

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Automatic Touch Hold



Mode

WWarning

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.

Single Beep

RANGE

+__

RANGE

CAT

HOLD

HOLD HOLD

AUTO

Momentary

HOLD

V V V

hc4f.eps

When the meter captures new input, it beeps and a new reading

is displayed.

Note

Stray voltages can produce a new reading.

To exit the Touch Holdmode, press momentarily or

turn the rotary switch.

Bar Graph

The bar graph shows readings relative to the full scale value of

the displayed measurement range and indicates polarity.

hc15f.eps

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77/75/23/21 English Instruction Sheet

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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

(KLmL)

RANGE

CAT

+__

RANGE

CAT

RANGE

CAT

Volts AC Volts DC Millivolts DC

VVmV

hc3f.eps

Resistance

(e)

Turn off the power and discharge all capacitors. An external

voltage across a component will give invalid resistance readings.

RANGE

CAT

hc7f.eps

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77/75/23/21 English Instruction Sheet

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Diode Test

(G)

RANGE

CAT

+__

Forward Bias Single Beep

RANGE

CAT

Reverse Bias

RANGE

CAT

Shorted

Open and

Good Diode Good Diode

Bad Diode

RANGE

CAT

Bad Diode

hc5f.eps

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77/75/23/21 English Instruction Sheet

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Continuity Test

( R)

RANGE

CAT

RANGE

CAT

hc8f.eps

If continuity exists (resistance < 210 Ωfor Models 21/75 and

<270 Ωfor Models 23/77), the beeper sounds continuously. The

meter beeps twice if it is in Touch Holdmode.

Current

(?A)

WWarning

To avoid injury, do not attempt a current

measurement if the open circuit voltage exceeds the

rated voltage of the meter.

To avoid blowing an input fuse, use the 10 A jack until you are

sure that the current is less than 300 mA.

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.

RANGE

CAT

hc10f.eps

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77/75/23/21 English Instruction Sheet

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Probe Holder

hc14f.eps

Maintenance

WWarning

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.

Caution

To avoid contamination or static damage, do not

touch the circuit board without proper static

protection.

Internal Fuse Test

RANGE

10 A300 mA Ω

<.5

Ω

4-8 OKOK OK

hc9f.eps

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77/75/23/21 English Instruction Sheet

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Battery Replacement

Note

Before opening the case, make sure the test leads are

removed and the rotary switch is turned to OFF.

hc12f.eps

Fuse Replacement

23/77 21/75

hc13f.eps

Cleaning

To clean the meter, use a damp cloth and mild detergent; do not

use abrasives or solvents on the meter.

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77/75/23/21 English Instruction Sheet

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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-*-276-6196

Anywhere in the world: +1-425-356-5500

Or, visit Fluke’s Web site at www.fluke.com.

Item Description Fluke

PN Quan.

BT1 Battery, 9 V, NEDA 1604/IEC 6F22, or

NEDA 1604A/IEC 6LR61 696534

614487 1

F1* Models 21/75:

Fuse, F630 mA, 250 V, Min Interrupt

Rating 1500 A or IEC 127-1 740670 1

F2* Fuse, F11 A, 1000 VAC/DC,

Min Interrupt Rating 17 kA 943118 1

F1* Models 23/77:

Fuse, F44/100 A, 1000 VAC/DC,

Min Interrupt Rating 10 kA 943121 1

F2* Fuse, F11 A, 1000 VAC/DC,

Min Interrupt Rating 17 kA 943118 1

* For safety, use exact replacement

Specifications

Accuracy is specified for a period of one year after calibration, at

18°C to 28°C (64°F to 82°F) with relative humidity to 90%. AC

conversions are ac-coupled, average responding, and calibrated

to the RMS value of a sine wave input.

Accuracy specifications are given as:

±([% of reading] + [number of least significant digits])

Maximum Voltage Between

any Terminal and Earth

Ground

Rated voltage

Display Digital: 3,200 counts, updates 2.5/sec

Analog: 31 segments, updates 25/sec

Response Time of Digital

Display V ac < 2 s

V dc < 1 s

Ω< 1s to 320 kΩ, < 2s to 3.2 MΩ,

< 10 s to 32 MΩ

Operating Temperature 0°C to 50°C

Storage Temperature -40°C to 60°C

Temperature Coefficient 0.1 x (specified accuracy)/°C

(<18°C or >28°C)

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77/75/23/21 English Instruction Sheet

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Electromagnetic Compatibility

In RF field of 3 V/m on all

functions.

Total accuracy = Specified accuracy

+ 0.1% of range.

Relative Humidity

except 32 MΩrange

32 MΩrange only

0% to 90% (0°C to 35°C)

0% to 70% (35°C to 50°C)

0% to 80% (0°C to 35°C)

0% to 70% (35°C to 50°C)

Altitude Operating: 2000 meters

Storage: 12,000 meters

Battery Type 9 V NEDA 1604 or 6F22 or 006P,

or NEDA 1604A or 6LR61

Battery Life 2000 hrs typical with alkaline

1600 hrs typical with carbon zinc

Continuity Beeper 4096 Hz

Shock, Vibration per MIL-T-PRF 28800F Class III,

Sinusoidal, Non Operating

Size (H x W x L) 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)

Weight 365 g (12.9 oz)

Safety 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

C22.2 No 1010.1-92, UL 3111-1.

EMC Regulations EN 61326-1 1997.

Certifications/Listings

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