User's Guide
LCD Multifunction Voltage Tester
Model VT30
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Visit us at www.TestEquipmentDepot.com
Back to the Extech VT30 Product Info Page
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:
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.
Input Protection Limits
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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)
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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
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
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.
LED will light and the “AC” icon will appear in
LED will light.
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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
2. Disconnect the meter from any test device or circuit before
3. Loosen the recessed Phillips head screw at the bottom of the
4. Hold the meter and pull the lower portion of the meter off until
5. Replace the two ‘AAA’ batteries observing polarity and
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.
BAT
icon will appear in the lower right of the display
when the battery voltage becomes low. Replace the batteries
when this appears.
opening the tester.
tester. Do not remove the screw.
the batteries are exposed.
dispose of the old batteries properly.
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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
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 131
Storage Temperature -22 to 140
Operating Humidity 10 to 85% RH (non-condensing)
Safety This meter is intended for origin of installation use and
Approvals CE, IP64
Dimensions 9.4 x 3 x 1.6” (240 x 78 x 40mm)
Weight 9.2oz (260g)
current
o
F (-10 to 55
o
F (-30 to 60
protected, against the users, by double insulation per
EN61243-3 and IEC61243-3 to Category IV 600V and
Category III 1000V; Pollution Degree 2.
o
C)
o
C)
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech VT30 Product Info Page
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
6
VT30 V2.1 10/06
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