Fluke 12E Manuale utente

12E

Digital Multimeter

Users Manual

PN 3382138

October 2008

All product names are trademarks of their respective companies.

LIMITED WARRANTY AND LIMITATION OF LIABILITY

This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This war-

ranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or

abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke's behalf. To

obtain service during the warranty period, return the unit to point of purchase with a description of the problem.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR

PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some states or countries

do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages, this limitation of

liability may not apply to you.

Fluke Corporation

P.O. Box 9090

Everett, WA 98206-9090

U.S.A.

Service Center Address:

Fluke Corporation Beijing Service Center

Room 2301 Scite Tower

22 Jianguomenwai Dajie, Chao Yang District

Beijing 100004, PRC

Tel: 010-65123435

Shanghai Shilu Instrument Co., Ltd.

#139, 2638 Nong, Hongmei Nanlu

Shanghai 201108

Biao Zhun Hao: Q/SXAV 1-2002

Table of Contents

Title Page

Introduction .................................................................................................................... 1

Safety Information .......................................................................................................... 1

Safe Working Practices .................................................................................................. 1

Instrument Overview ...................................................................................................... 4

Terminals ................................................................................................................... 4

Display ....................................................................................................................... 4

Battery Saver ................................................................................................................. 5

Making Measurements ................................................................................................... 5

Manual Ranging and Auto Ranging ........................................................................... 5

Data Hold .................................................................................................................. 5

Measuring AC and DC Voltage .................................................................................. 5

Measuring AC or DC Current ..................................................................................... 6

Measuring Resistance ............................................................................................... 7

Testing for Continuity ................................................................................................. 7

Testing Diodes ........................................................................................................... 8

Measuring Capacitance ............................................................................................. 8

Maintenance ................................................................................................................... 8

General Maintenance ................................................................................................ 9

12E

Users Manual

Testing the Fuses...................................................................................................... 9

Replacing the Batteries and Fuses ........................................................................... 10

Service and Parts .......................................................................................................... 10

General Specifications ................................................................................................... 11

Accuracy Specifications ................................................................................................. 12

12E

Multimeter

Introduction

Warning

To avoid electric shock or personal injury,

read "Safety Information” and “Warning and

Precautions” before using the Meter.

The Fluke 12E Multimeter (hereafter referred to as “the

Meter”) is a 4,000 count instrument.

The Meter is battery powered with a digital display.

Safety Information

The Meter complies with IEC 1010-1 CAT I 1000 V, CAT

II 600 V, and CAT III 300 V overvoltage standards. See

Specifications.

Use the Meter only as specified in this manual, otherwise

the protection provided by the Meter may be impaired.

In this manual, a Warning identifies conditions and

actions that pose hazards to the user.

A Caution identifies conditions and actions that may

damage the Meter or the equipment under test.

International symbols used on the Meter and in this

manual are explained in Table 1.

Safe Working Practices

Review the safety information and comply with the safe

working practices on pages 2 and 3.

12E

Users Manual

Warnings and Precautions

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the

equipment under test, comply with the following practices:

 Before using the Meter, inspect the case. Do not use the Meter if it is damaged. Look for cracks or missing plastic. Pay

particular attention to the insulation around the connectors.

 Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged

test leads before using the Meter.

 Verify a Meter’s operation by measuring a known voltage. Do not use the Meter if it operates abnormally. Protection

may be impaired. When in doubt, have the Meter serviced.

 Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and

earth ground.

 Use caution when working with voltages above 30 V ac rms, 42 V ac peak, or 60 V dc. These voltages pose a shock

hazard.

 Use the proper terminals, function, and range for your measurements.

 Do not operate the Meter around explosive gas, vapor, or dust.

 When using the probes, keep the fingers behind the finger guards.

 When making connections, connect the common test lead before connecting the live test lead; when disconnecting,

disconnect the live test lead before disconnecting the common test lead.

 Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or

capacitance.

 Do not use the Meter in a manner not specified by this manual or the safety features of the Meter may be impaired.

 For all dc functions, including manual or auto-ranging, to avoid the risk of shock due to possible improper reading,

verify the presence of any ac voltages by first using the ac function. Then select a dc voltage range equal to or greater

than the ac range.

Multimeter

Safe Working Practices

 Warnings and Precautions (Continued)

 Before measuring current, check the Meter’s fuses (see “Testing the Fuses”) and turn OFF power to the circuit before

connecting the Meter to the circuit.

 Do not operate the Meter with the case (or part of the case) removed.

 Use only two AA batteries, properly installed in the Meter case, to power the Meter.

 Replace the battery as soon as the battery indicator () appears. With a low battery, the Meter might produce false

readings that can lead to electric shock and personal injury.

 Do not measure voltages above 600 V in Category II, or 300 V in Category III installations.

 Remove test leads from the Meter before opening the Meter case or battery door.

 When servicing the Meter, use only specified replacement parts.

Table 1. International Electrical Symbols

 AC (Alternating Current) Earth Ground

 DC (Direct Current) Fuse



AC or DC Double Insulated

 Safety Information Shock Hazard

 Battery  Complies with EU directives

12E

Users Manual

Instrument Overview

Terminals

COM

mA A V

400mA

FUSED

10A

FUSED

CAT I 1000 V

CAT II 600 V

apg1f.eps

Item Description

1 Input terminal for ac and dc current

measurement to 10 A.

2 Input terminal for ac and dc microamp and

milliamp measurement to 400 mA.

3 Common (return) terminal for all

measurements.

4 Input terminal for voltage, resistance,

continuity, diode, capacitance,

measurements.

Display

2f.e

Item Description

1 Relative mode is active

2 Continuity selected

3 Display Hold is enabled

4 Diode test is selected

5 F – Farads for capacitance

6 A, V – amps or volts

7 DC, AC – dc or ac voltage or current

8 Ω - Ohms is selected

9 m, M, k – decimal prefix

10 Auto range selected

11 Battery is low and should be changed

Multimeter

Battery Saver

The Meter enters the “Sleep mode” and blanks the display

if the Meter is not used and the input is inactive for 30

minutes. Press any button or turn the rotary switch to

wake the Meter up. To disable the Sleep mode, hold down

the YELLOW button while turning the Meter on.

Making Measurements

Manual Ranging and Auto Ranging

The Meter has both manual and auto range options. In the

auto range mode, the Meter selects the best range for the

input detected. This allows you to switch test points

without having to reset the range. You can override auto

ranging by selecting the range manually.

The Meter defaults to the auto range mode in

measurement functions that have more than one range.

When the Meter is in the auto range mode, Auto Range is

displayed.

To enter and exit the manual range mode:

1. Press .

Each press of  increments the range. When the

highest range is reached, the Meter wraps to the

lowest range.

2. To exit the manual range mode, press and hold 

for two seconds.

 Warning

Dangerous voltages may be present at the

input terminals and may not be displayed.

Data Hold

To hold the present reading, press . Press  again

to resume normal operation.

Measuring AC and DC Voltage

To minimize improper reading of an unknown voltage

containing either ac or ac + dc voltage components, first

select the ac voltage function on the meter making

particular note of the ac range required for a good

measurement. Next manually select the dc function with

the dc range that either matches or is higher than the

previously noted ac range. Using this procedure minimizes

the effects of ac transients while making accurate dc

measurements.

1. Choose ac or dc by turning the rotary switch to ,  or



2. Connect the red test lead to the terminal and the

black test lead to the COM terminal

3. Measure the voltage by touching the probes to the

desired test points of the circuit

4. Read the measured voltage on the display.

Note

The only way to access the 400  range is by

manual ranging.

12E

Users Manual

Volts AC Volts DC Millivolts DC

VVmV

apg3f.eps

Figure 1. Measuring AC and DC Voltage

Measuring AC or DC Current

1. Turn the rotary switch to ,  or .

2. Toggle between ac or dc current measurement by

pressing the YELLOW button.

3. Connect the red test lead to either the A, or mA 

terminal based on the current to be measured and

connect the black test lead to the COM terminal.

4. Break the circuit path to be measured. Then connect

the test leads across the break and apply power.

5. Read the measured current on the display.

apg4f.eps

Figure 2. Measuring AC and DC Current

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