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Extech Instruments 411, Руководство пользователя

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V4.0       5/07 

3 

OVERVOLTAGE CATEGORY III 

This meter meets the IEC 610-1-95 standard for 
OVERVOLTAGE CATEGORY III. Cat III meters are protected 
against overvoltage transients in fixed installation at the 
distribution level. Examples include switches in the fixed 
installation and some equipment for industrial use with 
permanent connection to the fixed installation. 

SAFETY INSTRUCTIONS 

This meter has been designed for safe use, but must be 
operated with caution. The rules listed below must be carefully 
followed for safe operation. 

1. 

NEVER

 apply voltage or current to the meter that exceeds the 

specified maximum: 

Input Protection Limits 

Function Maximum 

Input 

VAC 750V 

DC/AC 

V DC or V AC 

1000V DC/AC, 200Vrms on 200mV range 

mA DC 

200mA 250V fast acting fuse 

A DC 

20A 250V fast acting fuse(30 seconds max 
every 15 minutes) 

Ohms, Continuity 

250Vrms for 15sec max 

2. 

USE EXTREME CAUTION

 when working with high voltages. 

3. 

DO NOT

 measure voltage if the voltage on the "COM" input 

jack exceeds 1000V above earth ground. 

4. 

NEVER

 connect the meter leads across a voltage source 

while the function switch is in the current, resistance, or diode 
mode. Doing so can damage the meter. 

5. 

ALWAYS

 discharge filter capacitors in power supplies and 

disconnect the power when making resistance or diode tests. 

6. 

ALWAYS

 turn off the power and disconnect the test leads 

before opening the covers to replace the fuse or battery. 

7. 

NEVER

 operate the meter unless the back cover and the 

battery cover is in place and fastened securely. 

Содержание 411

Страница 1: ...User s Guide True RMS Multimeter Extech 411 ...

Страница 2: ...tuation which if not avoided could result in death or serious injury This CAUTION symbol indicates a potentially hazardous situation which if not avoided may result damage to the product This symbol advises the user that the terminal s so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds in this case 1000 VAC or VDC This symbol adjacent to on...

Страница 3: ...m Input VAC 750V DC AC V DC or V AC 1000V DC AC 200Vrms on 200mV range mA DC 200mA 250V fast acting fuse A DC 20A 250V fast acting fuse 30 seconds max every 15 minutes Ohms Continuity 250Vrms for 15sec max 2 USE EXTREME CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the COM input jack exceeds 1000V above earth ground 4 NEVER connect the meter leads across a volt...

Страница 4: ...k button 10 Hold button 11 Backlight button Note Tilt stand and battery compartment are on rear of unit Symbols and Annunciators Continuity Diode test Battery status Test lead connection error µ micro 10 6 amps m milli 10 3 volts amps k kilo 10 3 ohms M mega 10 6 ohms Ω Ohms A Amps V Volts AC Alternating current AUTO Autoranging DC Direct current HOLD Display hold ºF Degrees Fahrenheit ºC Degrees ...

Страница 5: ... digits 50 to 400Hz 400Hz to 1kHz 200mA 0 1mA 1 8 reading 8 digits 2 5 reading 10 digits AC Current A AC True rms 20A 0 01A 3 0 reading 8 digits 3 5 reading 10 digits 200Ω 0 1Ω 0 8 reading 4 digits 2000Ω 1Ω 0 8 reading 2 digits 20kΩ 0 01kΩ 200kΩ 0 1kΩ 1 0 reading 2 digits Resistance 20MΩ 0 01MΩ 2 0 reading 5 digits 4 to 1382ºF 1ºF Temperature 20 to 750ºC 1ºC 3 0 reading 3 digits meter only probe a...

Страница 6: ...nominal Low Battery Indication is displayed if battery voltage drops below operating voltage Battery One 9 volt NEDA 1604 battery Fuses mA µA ranges 0 2A 250V fast blow A range 20A 250V ceramic fast blow Operating Temperature 41ºF to 104ºF 5ºC to 40ºC Storage Temperature 4 o F to 140 o F 20 o C to 60 o C Operating Humidity Max 80 up to 87ºF 31ºC decreasing linearly to 50 at 104ºF 40ºC Storage Humi...

Страница 7: ...g will stabilize and give a proper measurement when connected to a circuit DC VOLTAGE MEASUREMENTS CAUTION Do not measure DC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the highest V DC position 2 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana ...

Страница 8: ...voltage is present CAUTION Do not measure AC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the highest V AC position 2 Insert the black test lead banana plug into the negative COM jack Insert red test lead banana plug into the positive V jack 3 Touch the black test probe tip to the neutral side o...

Страница 9: ...jack 3 For current measurements up to 200mA DC set the function switch to the 200mA DC position and insert the red test lead banana plug into the uA mA jack 4 For current measurements up to 20A DC set the function switch to the 20A DC range and insert the red test lead banana plug into the 20A jack 5 Remove power from the circuit under test then open up the circuit at the point where you wish to m...

Страница 10: ...he highest 200mA AC position and insert the red test lead banana plug into the mA jack 3 For current measurements up to 20A AC set the function switch to the 20A AC range and insert the red test lead banana plug into the 20A jack 4 Remove power from the circuit under test then open up the circuit at the point where you wish to measure current 5 Touch the black test probe tip to the neutral side of...

Страница 11: ...Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive Ω jack 3 Touch the test probe tips across the circuit or part under test It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading 4 Read the resistance in the display and then set the function switch to th...

Страница 12: ...ck 4 If the resistance is less than approximately 150Ω the audible signal will sound If the circuit is open the display will indicate 1 DIODE TEST 1 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive diode jack 2 Turn the rotary switch to the position 3 Touch the test probes to the diode under test Forward bias will typically indic...

Страница 13: ...e ºF or ºC button for the desired units 4 Touch the Temperature Probe head to the part whose temperature you wish to measure Keep the probe touching the part under test until the reading stabilizes 5 Read the temperature in the display Note The temperature probe is fitted with a type K mini connector A mini connector to banana connector adaptor is supplied for connection to the input banana jacks ...

Страница 14: ...ay Press the HOLD key momentarily to activate or to exit the hold function AUTO POWER OFF The auto off feature will turn the meter off after 15 minutes LOW BATTERY INDICATION If the icon appears in the display the battery voltage is low and the battery should be replaced WRONG CONNECTION INDICATION The icon will appear in the upper right conner of the display and the buzzer will sound whenever the...

Страница 15: ...it gets wet wipe it off 2 USE AND STORE THE METER IN NORMAL TEMPERATURES Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts 3 HANDLE THE METER GENTLY AND CAREFULLY Dropping it can damage the electronic parts or the case 4 KEEP THE METER CLEAN Wipe the case occasionally with a damp cloth DO NOT use chemicals cleaning solvents or detergents 5 USE ONLY...

Страница 16: ...ng voltage The symbol will appear in the LCD display when the battery check button is pressed The battery should be replaced 2 Remove the two screws B securing the rear battery cover lift the cover off and replace the battery 3 Replace and secure the battery cover 4 Properly dispose of the old battery WARNING To avoid electric shock do not operate your meter until the battery cover is in place and...

Страница 17: ...nectors to gain access to the fuse holders 6 Gently remove the old fuse and install the new fuse into the holder 7 Always use a fuse of the proper size and value 0 2A 250V fast blow for the 200mA range 20A 250V fast blow for the 20A range 8 Align the center board with the connectors and gently press into place 9 Replace and secure the rear cover battery and battery cover WARNING To avoid electric ...

Страница 18: ... This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s t...

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