Triplett ET350 User manual

User Manual
Model ET350
Non-Contact Voltage and Magnetic Field Detector
Introduction
Congratulations on your purchase of the Triplett ET350 Non-Contact Voltage
and Magnetic Field Detector In order to use this product safely and correctly,
please read this manual thoroughly, especially the warning part.
After reading this manual, it is recommended to keep the manual at an easily
accessible place, preferably close to the device, for future reference.
The ET350 is a non-contact voltage and magnetic field detector with built-in
flashlight and acousto-optic synchronous alarm function. The CAT IV 1000V
safety class ensures users’ safety, making them essential tools for industry and
home.
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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Features
Low voltage mode (24V AC ~ 1000V AC)
Suitable for testing low-voltage motor (< 90V), audio systems, arc
welding machines, underground mine lighting, cables with thick
insulation layer, and other weak electromagnetic AC signals.
High voltage mode (90V AC ~ 1000V AC):
For detecting urban electric supply and three-phase systems. For
example, power distribution units, electrical panels, and electrical
appliances.
Safety
Warning
1. Please carefully read and fully understand the warnings and
operating instructions before use.
2. Please test the detector on a known live source within the rated AC
voltage range before use.
3. If the detector appears damaged or is not working properly, stop
using it immediately.
4. Do not detect voltage higher than 1000V.
5. Use caution when measuring AC voltage higher than 30V.
6. There may still be voltage even when no acousto-optic alarm is on.
7. The insulation type, wire thickness, distance from voltage source,
shielded wire, other wires, socket design, and other factors may
adversely affect test result. If there are uncertainties, use other
methods to verify the voltage.

8. Do not assume neutral or ground wire is safe to touch. Incorrect or
poorly connected circuits may cause wires to be charged.
9. The magnetic field generated by magnetized components may
interfere with detection
10. When low battery indication appears, please replace the
batteries.
11. When using the detector, please only hold up to the line before
the translucent sensing part and not over.
12. Comply with local and national safety regulations and
requirements.
13. The detector will not detect any voltage if:
The wire is shielded
The operator is not connected with the ground or isolated
from an effective ground
The voltage is DC
14. The detector may not detect any voltage if:
The operator does not hold the detector
The operator is wearing gloves
The wire under test is partially buried or in a grounded metal
conduit
The magnetic field generated by the voltage source is blocked,
suppressed or interfered with
The frequency of the voltage being detected is not a perfect
sine wave and may be distorted by harmonics
The detector is used outside of the operating specifications
(see Technical Specifications for details)

Electrical Symbols
Protected throughout by Double
insulation or Reinforced insulation
Alternating current
Caution, possibility of electric shock
Warning! Refer to the manual
In compliance with the directive of
European Union
Panel Description
Operating Instructions
1. Turning on the detector
1
NCV sensor head
2
Flashlight lighting
3
sensing signal LED
4
Mode status indicator light
5
Power button
6
Flashlight button
7
Pocket clip
8
Battery cap
○
8

Short press the power button. The buzzer will beep twice and the red
indicator light on the panel will light up, indicating that the detector is
on and ready for use. The default AC voltage detection range is 90-
1000V.
2. Turning on/off the flashlight
Flashlight on/off: Short press the flashlight button to turn on/off the
flashlight.
The flashlight will automatically turn off when the detector is not used
for 5 minutes.
3. AC voltage detection
Place the sensor head near the test object or the power socket with AC
voltage. When AC voltage is detected, the red LED in the tip and audible
buzzer will be on. LED frequencies increase when detector gets closer
to the test object.
Note: Please unplug other electrical devices on the socket before
detection.

4. Detection range selection
a) When the detector is on, the default mode is high voltage mode,
with detection range of 90-1000V. The red indicator light on the panel
will light up.
b) Short press the power button once. The red indicator light will switch
to green, and the device will switch to low voltage mode, with range of
24-1000V. In low voltage mode, the detector is more sensitive to
electrical interference/noise. Please only use low voltage mode during
weak electrical field environment.
c) Short press the power button once again. The green indicator light
will switch to yellow, and the device will switch to magnetic field
detection mode.
Note: In the magnetic field detection mode, voltage cannot be
detected at the same time.
5. Magnetic field detection
The magnetic field detection function of the detector can be used to
easily determine whether there is a magnetic field, so as to quickly
determine if components (solenoid valves, relays, contactors,
permanent magnets and electromagnets, etc.) are working properly.
The figure below shows how to use this function to check if the
solenoid valve is working properly.

In the magnetic field detection mode, place the detector tip near the
solenoid valve in operation. When the magnetic flux is detected to be
greater than 5mT, the yellow LED in the tip will be on, and the buzzer
will beep slowly, indicating that the solenoid valve is working properly.
Note: If the magnetic flux is less than 5mT, please use the front of the
detector tip to detect.
6. Auto power off
The detector will auto power off when it is not used for 5 minutes.
7. Turning off the detector manually
Long press the power button for 2 seconds to turn off the detector
8. Low battery indication
When the battery voltage is lower than 2.4V, the detector will
automatically shut down.

Technical Specifications
ET350 (US)
AC voltage
range
90~1000V AC (red indicator)
24~1000V AC (green indicator)
Frequency
range
50Hz/60Hz
Alarm mode
Audio/visual
Flashlight
White spotlight
Auto power
off
About 5 minutes
Low battery
indication
√
Vibration
function
N/A
Magnetic
field
detection
mode
√
(Yellow indicator light on)
IP rating
IP67
Safety class
CAT IV 1000V
Operating
temperature
0~40°C

Storage
temperature
-20~50°C
Humidity
≤80% (non-condensing)
Altitude
<2000m
Battery
2x1.5V AAA
Product size
6.3”x0.8”x1.0”(160.5x21.5x25 mm)
Weight
About 72g
Drop test
2m
Battery Replacement
1. Unscrew the battery cap
counterclockwise as shown below, and
then replace the batteries according to the
polarity indication.
2. Tighten the battery cap clockwise and
the buzzer will beep twice to indicate the completion of the
replacement.
Warranty Information
Triplett / Jewell Instruments extends the following warranty to the original
purchaser of these goods for use. Triplett warrants to the original purchaser for
use that the products sold by it will be free from defects in workmanship and
material for a period of (1) one year from the date of purchase. This warranty
does not apply to any of our products which have been repaired or altered by
unauthorized persons in any way or purchased from unauthorized distributors so
as, in our sole judgment, to injure their stability or reliability, or which have been
subject to misuse, abuse, misapplication, negligence, accident or which have
had the serial numbers altered, defaced, or removed. Accessories, including
batteries are not covered by this warranty
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