HVTest HT2671 User manual

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Dear Client
Thank you for Purchasing our HT2671 Insulation Resistance
Tester. Please read the manual in detail prior to first use, which will
help you use the equipment skillfully.
Our aim is to improve and perfect the
company's products continually, so there may be
slight differences between your purchase equipment
and its instruction manual. You can find the changes
in the appendix. Sorry for the inconvenience. If you have further
questions, welcome to contact with our service department.
The input/output terminals and the test column
may bring voltage, when you plug/draw the test wire or
power outlet, they will cause electric spark. PLEASE
CAUTION RISK OF ELECTRICAL SHOCK!
Company Address:
T4，No. 41, High-tech 2 Road，East Lake High-tech Development Zone，
Wuhan
Sales Hotline: [phone]
After Service Hotline:[phone]
Fax: [phone]
E-mail: [email protected]
Website: www.hvtest.cc

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SERIOUS COMMITMENT
All products of our company carry one year limited warranty
from the date of shipment. If any such product proves defective
during this warranty period we will maintain it for free. Meanwhile
we implement lifetime service. Except otherwise agreed by
contract.
SAFETY REQUIREMENTS
Please read the following safety precautions carefully to avoid
body injury and prevent the product or other relevant subassembly
to damage. In order to avoid possible danger, this product can only
be used within the prescribed scope.
Only qualified technician can carry out maintenance or repair
work.
--To avoid fire and personal injury:
Use Proper Power Cord
Only use the power wire supplied by the product or meet the
specification of this produce.
Connect and Disconnect Correctly
When the test wire is connected to the live terminal, please do
not connect or disconnect the test wire.
Grounding
The product is grounded through the power wire; besides, the
ground pole of the shell must be grounded. To prevent electric

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shock, the grounding conductor must be connected to the ground.
Make sure the product has been grounded correctly before
connecting with the input/output port.
Pay Attention to the Ratings of All Terminals
To prevent the fire hazard or electric shock, please be care of
all ratings and labels/marks of this product. Before connecting,
please read the instruction manual to acquire information about the
ratings.
Do Not Operate without Covers
Do not operate this product when covers or panels removed.
Use Proper Fuse
Only use the fuse with type and rating specified for the product.
Avoid Touching Bare Circuit and Charged Metal
Do not touch the bare connection points and parts of energized
equipment.
Do Not Operate with Suspicious Failures
If you encounter operating failure, do not continue. Please
contact with our maintenance staff.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in Explosive Atmospheres.
Ensure Product Surfaces Clean and Dry.

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－Security Terms
Warning: indicates that death or severe personal injury may
result if proper precautions are not taken
Caution: indicates that property damage may result if proper
precautions are not taken.

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Contents
I. Introduction······························································· 6
II. Function and Features················································7
III. Technique Specification············································· 8
IV. Operation Instructions··············································· 9
V. Notes···································································· 10

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I. Introduction
1. Principle of the meter
HT2671 Digital Megger consists of medium and large scale
integrated circuit with high output power and high short-circuit
current value features. The output voltage is up to four grades. The
built-in battery served as power supply become high DC voltage by
DC/DC transformation, which goes from E pole to L pole via the
object being tested. By this way, it produces a current from pole E
to pole L, which converted by I/V and computed by the divider. The
value of insulation resistance will display on the LCD finally.
2. Block Diagram of Circuit
As shown in the following diagram:
3. Applications
The meter is essential and common device in power industry,
post and telecommunications, communications, mechanical and
electrical installation and maintenance and industrial sector or
corporate sector using electric power as theirs industrial power or

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energy sources. It is suitable for measuring the resistance of
different kinds of insulating materials and insulation resistance of
transformers, motors, cables and electrical equipment.
II. Function and Features
The meter has the following features:
1. High output power, strong load ability, and strong
anti-interference ability.
The shell body is made of aldural/high-strength aluminum alloy,
equipped with potential protection ring and fourth-order active low
pass filter, it can play an effective role in shielding external power
frequency and strong electromagnetic field. For the measurement
of capacitive specimen, since the short-circuit current is greater
than 1.6mA, it’s easy to rise the test voltage to the rating of output
voltage. For the measurement of low resistance, it will not affect the
test by using scaling method.
2. The meter is battery powered and the measure range is
converted automatically. The easy-to-read panel and LCD display
make measurement very convenient and fast.
3. The output short-circuit current of the meter can be
measured immediately without estimation.

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III. Technique Specification
1. Operating Conditions
Temperature: 0℃~+45℃
Relative humidity: ≤85%RH
2. Output voltage grades, measuring range, resolution, error
Output voltage grades: 500V，1000V，2000V，2500V
Measuring range: 0~19990MΩ
Resolution: 0.01MΩ，0.1MΩ，1.0MΩ，10.0MΩ
Relative error: 0~2000MΩ≤±5%±2d,
2000MΩ~19990MΩ≤10%±2d
3. Load ability of maximum output voltage and short-circuit current
Voltage/Load: 2500V/20MΩ
Voltage drop: Approximately 10%
Short-circuit current: >1.6mA
4. Power supply, power dissipation
DC: 8×1.5V(AA, R6)battery
AC: 220V/50Hz
Power dissipation: quiescent power dissipation≤160mW;
Maximum power≤2.5W
5. Dimensions and weight
Dimensions：235mm(L)×200mm(W)×135mm(D)
Weight：<1.4kg

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IV. Operation Instructions
1. Measurement Procedure
Turn the power switch “ON/OFF”, the default of meter is at 500V.
Select the required voltage grade and the indicator light will show
the selected voltage grade. Press the high voltage “start/stop”
button and the indicator light for high voltage will glow. The stable
value displaying on the LCD multiplied by 10 is the measured
insulation resistance value. When the tested insulation resistance
value exceeds the upper limit range of the meter, the screen will
only display “1” on the left-most position. Pressing “start/stop”
button will turn off the high voltage. Pressing down the “ON/OFF”
button will turn off the power supply.
Notes: As measure, accompanied with absorption and
polarization occurring, Insulation reading gradually drifts to large
values or bounces up and down, it is normal.
2. Explanation for the wiring terminals
When measuring the insulation resistance you should connect
the “L” line and the measured object to the current-carrying part. The
grounding “E” should be connected to the shell of the measured
object or the earth. Shield “G” is connected to the protection parts or
the other parts which are not being measured of the measured
object to avoid the error caused by shell leakage. When measuring

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the insulation resistance among components of electronic products,
the “L” terminal and the “E” terminal can be connected to any line.
When measuring the resistance between phases of electrical
generator, you can choose two among the three phases at will, and
the remaining one should be grounded.
V. Notes
1. When the meter is stored you should pay attention to
environment temperature and moisture. The meter should be place
in dry and ventilated environment and should be shielded from dust,
humidity, vibration, acid, soda and corrosive gas damage.
2. When the measured object is charged, you should disconnect
the power before starting the measurement. Otherwise, that may
endanger safety of your body and the device! The DC voltage
between the “E” terminal and “L” terminal is high after turning on the
high voltage. Make sure any parts of your body should not touch the
terminals during measuring.
3. This meter uses AC and DC power supply. When connect to
AC power supply, the meter will prior use AC power supply; when
not connect to AC power supply, battery will power meter.
4. “←” appearing on the top left corner of the screen says
battery voltage is low and you should replace a new battery. If the
meter will not be used for a long time, all batteries should be

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removed to prevent meters from corrosion.