Fluke III Series Manuale utente

79/26 English Instruction Sheet

Page

79/26

Series III Multimeter

Instruction Sheet

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 probe to a voltage source when the test

leads are plugged into the 10 A or 40 mA input jack.

•Never apply more than 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 687589 August 1997 Rev. 2, 4/98

All product names are trademarks of their respective companies.

79/26 English Instruction Sheet

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Input Jacks

600V

1000V

FUSED

CAT

Volts, Ohms,

Diode Test

Common Terminal

Amp

Milliamp

jo1f.eps

See Specifications for overload protection.

Ranging

The meter defaults to autorange when you turn on the meter.

Manual ranging is available in V ac, V dc, Hz, ohms,

capacitance, A ac, and A dc.

RANGE

CAT

RANGE

MANUAL

Momentary

jo11f.eps

To return to autorange, press for 1 second 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.

0 2001 400 2 600 3800 41000

jo19f.eps

79/26 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 a

stable voltage reading.

Single Beep

RANGE

CAT

+__

RANGE

CAT

RANGE

CAT

HOLD

HOLD HOLD

HOLD

V V V

jo4f.eps

When the meter detects a new input, it beeps and displays a new

reading.

Stray voltages can cause the meter to display a new reading.

To exit the Touch Holdmode, press the yellow key a second

time or turn the rotary switch.

Smoothing Displayed Readings

Smoothing displays the average of eight readings. When the

input signal changes rapidly, smoothing makes the digital display

readings more stable. Smoothing does not work in continuity, Lo-

Ohms, and capacitance.

To select Smoothing, press the yellow key while turning on the

meter.

79/26 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 screen only 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

jo3f.eps

In the mV dc function, the meter defaults to 400 mV. To enter the

40 mV range, press momentarily.

Frequency

(Hz)

The bar graph indicates the ac voltage present.

WWarning

To avoid electric shock, disregard the bar graph

when frequency is > 1 kHz. If the frequency of

the measured signal is > 1 kHz, the bar graph

voltage is unspecified.

RANGE

CAT

jo20f.eps

79/26 English Instruction Sheet

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Resistance

(e)

Turn off the power and discharge all capacitors. An external

voltage across a component will give invalid resistance readings.

RANGE

jo7f.eps

Diode Test

(G)

RANGE

+__

Forward Bias

Single Beep

RANGE

CAT

Reverse Bias

Good Diode Good Diode

RANGE

CAT

Shorted

and

Bad Diode

Open

RANGE

CAT

Bad Diode

40 40

jo5f.eps

Press 1 second to turn the beeper off.

79/26 English Instruction Sheet

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Lead Resistance Compensation

This function compensates for resistance in the leads and the

meter’s internal protection circuitry. You can compensate in

either Lo-Ohms or continuity.

RANGE

CAT

RANGE

CAT

RANGE

CAT

RANGE

1 second

40 40 40

jo17f.eps

When zero is displayed, compensation has occurred. The meter

stays compensated until you change functions.

Lo-Ohms

(40 e)

The Lo-Ohms (40 Ω) function improves noise rejection and

resolution, but is less accurate than the ohms function. In this

function, the beeper is turned off.

RANGE

1 Second

jo6f.eps

To compensate for the lead resistance, see “Lead Resistance

Compensation.”

79/26 English Instruction Sheet

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Continuity Test

( R)

RANGE

CAT

RANGE

CAT

40 40

jo8f.eps

Opens or shorts > 1 ms are detected. Press momentarily

for lead compensation. Press 1 second to turn the

beeper off and place the meter into Lo-Ohms autoranging.

Capacitance

(E)

Turn off the power and discharge the capacitor. If the capacitor

requires more discharging, diSC displays while the capacitor

discharges.

RANGE

jo18f.eps

For rated accuracy in the lowest two capacitance ranges,

subtract the open-lead reading from the measurement.

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 40 mA.

79/26 English Instruction Sheet

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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

jo10f.eps

Probe Holder

jo21f.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 A40 mA Ω

<.5

Ω

10-12 OKOK OK

jo9f.eps

79/26 English Instruction Sheet

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Battery and Fuse Replacement

Note

Before opening the case, make sure the test leads are

removed and the rotary switch is turned to OFF.

jo14f.eps

Cleaning

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

use abrasives or solvents on the meter.

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 Alkaline (NEDA 1604A/

IEC 6LR61) 614487 1

F1* 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

True RMS and Crest Factor

True rms sensing provides accurate readings on sinusoidal

signals and on signals with harmonics or distorted waveforms.

True rms readings indicate the true heat-providing current which

may cause overheated conductors, connections, breakers, or

transformers.

Crest factor (CF) is the peak signal value divided by the rms

signal value and defines the dynamic range of the meter. A sine

wave has a CF = 1.4.

79/26 English Instruction Sheet

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Specification

Accuracy specifications:

±([% of reading] + [number of

least significant digits])

1 year, 18°C to 28°C (64°F to 82°F)

≤90% RH

Display Digital: 4000 counts, updates 4/sec

Analog: 63 segments, updates 40/sec

Frequency: 9,999 counts

Capacitance: 9,999 counts

Response Time of Digital

Display V ac < 1.5 s

V dc < 1 s

Ω<1 s to 40 kΩ, <2 s to 4 MΩ, <10 s to

40 MΩ

Operating Temperature 0°C to 55°C

Storage Temperature -40°C to 60°C

Temperature Coefficient 0.1 x (specified accuracy)/°C

(<18°C or >28°C)

Relative Humidity 90% (0°C to 30°C)

75% (30°C to 40°C)

45% (40°C to 50°C)

35% (50°C to 55°C)

Altitude Operating: 2000 meters

Storage: 12,000 meters

Battery Type 9 V, NEDA 1604A or IEC 6LR61

Battery Life 500 hrs typical with alkaline

Continuity Beeper 4096 Hz

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

Sinusoidal, Non Operating

Drop I meter drop per IEC 1010-1

Enclosure Conforms to IP-40 per IEC-529

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)

Electromagnetic Compatibility V ac and A ac only: RF field = 3 V/m.

Total accuracy = specified accuracy +

2.0% of range. EN 61326-1: 1997

Surge Protection 6 kV peak per IEC 1010-1, 1990-09

Safety 600 V CAT III and 1000 V CAT II per

ANSI/ISA-S82.01-94, UL3111-1,

CSA/CAN C22.2 No 1010.1-92,

EN 61010 part 1:1993.

Certification

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