Multifunction Voltage Tester
Model VT10
User's Guide
Introduction
Congratulations on your purchase of the Extech VT10 Multifunction Voltage Tester. The VT10 measures AC Voltage to 600V and DC Voltage to 400V with LED indicators, and LEDs for positive and negative polarity. Additional features include audible continuity beeper, low impedance mode for eliminating phantom voltages, and a built-in flashlight to illuminate test connections during measurements This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Guide, Product Updates, and Customer Support.
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
Safety Precautions
Double insulation
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.
9. NEVER apply voltage to the meter that exceeds the specified maximum:
Input Protection Limits
VAC, VDC, Continuity 600VAC: 30 second max
400VDC: 30 second max
10. USE EXTREME CAUTION when working with high voltages.
11. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making continuity tests.
12. ALWAYS disconnect the test leads before opening the cover to replace the battery.
13. NEVER operate the meter unless the battery cover is in place and fastened securely.
2 VT10-en-GB_V4.3 12/14
Description
3. Flashlight
4. LED voltage level indicators
5. LED (AC voltage indicator)
6. LED (low impedance test indicator)
7. LED (phase sequence direction indicators)
8. LED (continuity indicator)
9. LED (AC/DC +V/-V polarity voltage indicators)
10. Low impedance button (+)
13. Low impedance button (-)
3 VT10-en-GB_V4.3 12/14
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 (+) and negative (-) test leads to the device or circuit under test.
3. If the voltage is higher than 4.5V AC/DC, the voltage level LEDs will light and display the reading.
4. For AC voltages, the LED and the “AC” LEDs will light in the display. For DC voltages, the “+V” or “-V” LED will light to indicate polarity. In addition, when negative DC voltages are measured, the continuity LED will light and the audible alert will sound.
Note: The measurement time should not exceed 30 seconds. After 30 seconds the meter should be allowed to cool for 10 minutes.
Single Lead AC Voltage Detection
To check for the presence of voltage (between 100V and 600V) using only the positive test lead (+), 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 LEDs.
Note: The maximum duty cycle in this mode is 5 seconds for voltages up to 250V. Allow 10 minutes between each reading.
Note: Measuring from hot to ground may trip any GFCI equipped circuits.
Continuity Test
The tester can measure resistance and alert the user if the resistance value is less than 400kΩ.
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 400kΩ, the tester will sound an audible alert and the continuity LED will light.
4 VT10-en-GB_V4.3 12/14
Flashlight
Press and hold the button to turn the flashlight on. Release the button to turn the flashlight off.
3-Phase Rotation
The 3-phase rotation function indicates whether the 3 phase AC lines or mains are live and also identifies the phase orientation of the three wires before attaching them to a motor or other equipment.
The phase sequence will determine the direction (Clockwise or Counter-clockwise) a motor will rotate when connected.
To determine clockwise rotation (P1-P2-P3)
1. Touch probe L1 to any one of the three AC mains. L abel this phase P1.
2. Touch probe L2 to the other two phases. One phase will indicate “L” and one will indicate
“R”
3. Label the phase that indicates “R” as P2.
4. Touch probe L1 to phase P2 and touch probe L2 to the remaining unlabeled AC main wire.
The “R” icon will illuminate. Label this phase P3.
5. The clockwise sequence P1-P2-P3 (also known as 1-2-3 or R-S-T) has been identified.
6. To determine a counterclockwise rotation exchange the “L” and “R” in the procedure.
L1
P1 P2 P3
L1
P1 P2 P3
L2
P1 P2 P3
L1
L2
5 VT10-en-GB_V4.3 12/14
Maintenance
Battery replacement
1. Disconnect the meter from any test device or circuit before opening the tester.
2. Loosen the recessed Phillips head screw at the bottom of the tester. Do not remove the screw.
3. Hold the meter and pull the lower portion of the meter off until the batteries are exposed.
4. Replace the two ‘AAA’ batteries observing polarity and dispose of the old batteries properly.
5. Slide the meter back together and replace the screw.
All EU users are legally bound by the battery ordinance to return all used batteries to collection points in your community or wherever batteries / accumulators are sold!
Disposal in the household garbage is prohibited!
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.
6 VT10-en-GB_V4.3 12/14
Specifications
Voltage LED steps
ACV frequency range
LED enable input voltage
Accuracy
Range selection
Max measuring current
Display delay
Input Impedance
Continuity test
Low impedance test
Operation time
Power supply
Battery life
Operating Temperature
Storage Temperature
Operating Humidity
Operating Altitude
Safety
AC: 24, 48, 120, 208, 240, 277, 480, 600
DC: 6, 12, 24, 36, 48, 110, 220, 400
50/60Hz
>4.5V AC/DC
-30% to 0% of the indication
Automatic
≤1.2mA (600VAC); ≤1.0mA (400VDC)
LED indication <0.1s
1MΩ (approx)
Range 0 to 400kΩ, guaranteed on < 50kΩ; <10µA test current;
12-250VAC/DC; impedance <6kΩ;
30 seconds on / 10 minutes off duty cycle
2 x “AAA” 1.5V alkaline batteries, 50mA max
Approx. 8 hours of continuous use typical
-10 to 55 o C (14 to 131 o F)
-30 to 60 o C (-22 to 140 o F)
10 to 85% RH (non-condensing)
2000m (7000 ft.) maximum
This meter is intended for origin of installation use and protected, against the users, by double insulation per EN61243-3:2010 CATIII
600V and CAT IV 600V.
Dimensions
Weight
240 x 78 x 40mm (9.4 x 3 x 1.6”)
260g (9.2oz)
Copyright © 2014 FLIR Systems, Inc.
All rights reserved including the right of reproduction in whole or in part in any form
www.extech.com
7 VT10-en-GB_V4.3 12/14
