Extech Instruments VT10 User manual

User's Guide
Multifunction Voltage Tester
Model VT10
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech VT10 Product Info Page
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com

VT10 V2.0 08/06
2
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 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.
9. NEVER apply voltage to the meter that exceeds the specified maximum:
Input Protection Limits
Function Maximum Input
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.

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Description
1. Test Probe (-)
2. Test Probe (+)
3. Flashlight
4. LED voltage level indicators
5. LED (AC voltage indicator)
6. LED (low impedance test indicator)
7. LED (DC +V/-V polarity indicators)
8. LED (continuity indicator)
9. LED (AC/DC voltage indicators)
10. Low impedance button (+)
11. Flashlight button
12. Battery cover
13. Low impedance button (-)
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com

VT10 V2.0 08/06
4
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” LED will light in the display.
For DC voltages, the “DC” LED will light and the “+V” or “-V“ LED will
light to indicate polarity.
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 LEDs 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
400k.
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 400k., the tester will sound an audible alert 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.

VT10 V2.0 08/06
5
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.
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.
Specifications
Voltage LED steps AC: 24, 48, 120, 208, 240, 277, 480, 600
DC: 6, 12, 24, 36, 48, 110, 220, 400
ACV frequency range 50/60Hz
LED enable input voltage >4.5V AC/DC
Accuracy -30% to 0% of the indication
Range selection Automatic
Max measuring current 1.2mA (600VAC); 1.0mA (400VDC)
Display delay LED indication <0.1s
Input Impedance 1M(approx)
Continuity test Range 0 to 400k, guaranteed on < 50k; <10µA test
current;
Low impedance test 12-250VAC/DC; impedance <6k;
Operation time: 30 seconds on/10 minute off duty cycle
Power supply 2 x “AAA” 1.5V alkaline batteries, 50mA max
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)
Operating Altitude 7000 ft. (2000 meters) maximum
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)