Extech Instruments VT30 Manuale utente

User's Guide

LCD Multifunction Voltage Tester

Model VT30

VT30 V2.1 10/06

Introduction

Congratulations on your purchase of the Extech VT30 Multifunction Voltage Tester. The

VT30 measures AC voltage to 480V and DC Voltage to 690V with LCD readout, stepped

voltage bargraph indicator, and LEDs for positive and negative polarity. Additional

features include audible continuity beeper, low impedance test for eliminating phantom

voltages, and a built-in flashlight to illuminate test connections during measurements.

This meter is shipped fully tested and with proper use will provide years of reliable

service.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user

must refer to the manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal use,

hazardous voltages may be present

Double insulation

Safety Precautions

1. Improper use of this meter can cause damage, shock, injury or death. Read and

understand this manual before use.

2. Ensure that any covers or battery doors are properly closed and secured before use.

3. Inspect the condition of the test leads and the meter itself for any damage before use.

4. Do not exceed the rated input limits.

5. Use great care when taking measurements greater than 25VAC rms or 35VDC. These

voltages are considered a shock hazard.

6. Discharge capacitors and remove power from the DUT before Continuity tests.

7. Remove the batteries from the meter if the meter is to be stored for long periods.

8. Voltage measurement results on electrical outlets can be misleading because of the

difficulty in making a proper connection to the electrical contacts.

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 to the meter that exceeds the specified maximum:

Input Protection Limits

Function Maximum Input

VAC, VDC, Continuity 480VAC, 690VDC

Low Impedance 3s<400V AC/690V DC

2. USE EXTREME CAUTION when working with high voltages.

3. ALWAYS discharge filter capacitors in power supplies and disconnect the power when

making continuity tests.

4. ALWAYS disconnect the test leads before opening the cover to replace the battery.

5. NEVER operate the meter unless the battery cover is in place and fastened securely.

VT30 V2.1 10/06

Description

1. Test Probe L1 (-)

2. Test Probe L2 (+)

3. Flashlight

4. LCD display

5. LED (AC voltage indicator [between 100 to 480V])

6. LED (low impedance test)

7. LED (continuity)

8. Low impedance test button (L2)

9. Flashlight button

10. Battery cover

11. Low impedance test button (L1)

VT30 V2.1 10/06

Operation

Always test the meter on a known live circuit before taking measurements

Voltage Measurement

1. Note: The voltage tester will turn on automatically when voltages

higher than 4.5V AC/DC are detected.

2. Touch the positive (L2) and negative (L1) test leads to the device or

circuit under test.

3. If the voltage is higher than 4.5V AC/DC, the LCD will light and

display the reading. The stepped voltage bargraph scale in the

display will also indicate the reading.

4. For AC voltages, the LED will light and the “AC” icon will appear in

the display. For DC voltages, the “DC” icon will be displayed. If the

DC voltage is negative, a minus sign will be displayed before the

digital readout.

Single Lead AC Voltage Detection

To check for the presence of voltage (between 100V and 480V)

using only the positive test lead (L2), touch the lead to the device or

circuit under test. If voltage is present, the LED will light.

Note: In this mode, the actual voltage is not displayed; only the

presence of voltage is detected.

Low Impedance Voltage Measurement

Due to the lowered internal impedance, capacitive voltage is

suppressed so that the reading shows the actual voltage

applied. This can be used to quickly identify phantom voltages.

1. Hold the two test tips on the measuring points to be

tested.

2. Press the two low impedance test buttons

simultaneously.

3. The Low Impedance LED will light and the applied

voltage will be displayed on the LCD.

Note: The maximum duty cycle in this mode is 5 seconds for

voltages up to 250V and 3 seconds for voltages up to

690V. Allow 10 minutes between each reading.

Note: Measuring from hot to ground may trip any GFCI equipped circuits.

VT30 V2.1 10/06

Continuity Test

The tester can measure resistance and alert the user if the resistance value is less than

200kΩ.

1. Before taking a continuity test, make sure that power to the device or circuit under test

is off and that all capacitors are discharged.

2. Touch the test tips to the device under test.

3. If the resistance is less than 200kΩ, the tester will sound an audible alert; the LCD will

display “000”, and the continuity LED will light.

Flashlight

Press and hold the button to turn the flashlight on. Release the button to turn the flashlight off. After the

button is released, the light will turn off after 12 seconds (approx).

Maintenance

Battery replacement

1. The

BAT

icon will appear in the lower right of the display

when the battery voltage becomes low. Replace the batteries

when this appears.

2. Disconnect the meter from any test device or circuit before

opening the tester.

3. Loosen the recessed Phillips head screw at the bottom of the

tester. Do not remove the screw.

4. Hold the meter and pull the lower portion of the meter off until

the batteries are exposed.

5. Replace the two ‘AAA’ batteries observing polarity and

dispose of the old batteries properly.

6. Slide the meter back together and replace the screw.

Cleaning and Storage

Before cleaning the tester, ensure that the test leads are not connected to any circuit or

device. Wipe the meter only with a damp cloth as needed. Do not apply abrasives, solvents,

or other cleaners to the surface of the meter. Store with the battery removed and avoid

extreme temperature and humidity.

VT30 V2.1 10/06

Specifications

LCD display 1999 counts (3-1/2 digits) with bargraph and backlight

Resolution 1 Volt

AC Voltage range 0 to 480V

ACV frequency range 50/60Hz

DC Voltage range 0 to 690V

Accuracy ACV ±(1.5%rdg + 5d); DCV ±(1.0%rdg + 3d)

Range selection Automatic

Max measuring current ≤1.0mA (400VAC); ≤1.5mA (690VDC)

Response time Updates 2-3 times/sec

Input Impedance 1MΩ(approx)

Continuity test Range 0 to 200kΩ, guaranteed on < 50kΩ; <5µA test

current

Overvoltage protection 480VAC/690VDC

Low impedance test 12-250VAC/DC; impedance <6kΩ;

LCD enable input voltage >4.5V AC/DC

Operation time: 5s<250V AC/DC

Power supply 2 x “AAA” 1.5V alkaline batteries

Battery life Approx. 8 hours continuous use typical

Operating Temperature 14 to 131oF (-10 to 55oC)

Storage Temperature -22 to 140oF (-30 to 60oC)

Operating Humidity 10 to 85% RH (non-condensing)

Safety This meter is intended for origin of installation use and

protected, against the users, by double insulation per

EN61243-3 and IEC61243-3 to Category IV 600V and

Category III 1000V; Pollution Degree 2.

Approvals CE, IP64

Dimensions 9.4 x 3 x 1.6” (240 x 78 x 40mm)

Weight 9.2oz (260g)

VT30 V2.1 10/06



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: support@extech.com

Repair/Returns: Ext. 210; Email: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies on sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website at www.extech.com for

contact information. A Return Authorization (RA) number must be issued before any

product is returned to Extech. The sender is responsible for shipping charges, freight,

insurance and proper packaging to prevent damage in transit. 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 total liability is limited to repair or replacement of the

product. The warranty set forth above is inclusive and no other warranty, whether written or

oral, is expressed or implied.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also provides

NIST certification for most products. Call the Customer Service Department for information

on calibration services available for this product. Extech recommends that annual

calibrations be performed to verify meter performance and accuracy.

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