HVTest HTZZ-5A User manual

1
Dear Client
Thank you for Purchasing our HTZZ-5A Transformer DC
Winding 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

2
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

3
ground pole of the shell must be grounded. To prevent electric
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.

4
－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.

5
Contents
I. Summarizes....................................................................................6
II. Technical indicators..................................................................... 7
III. Method of use.............................................................................. 8
IV. Failure analysis and troubleshooting.....................................10
V. Matters needing attention.........................................................10

6
I. Summarizes
The measurement of power transformer winding DC resistance
is a very important test items, in the "power equipment test
procedures in the", followed by ranking in second place for the
transformer test project, the "Regulations" provisions in transformer
changeover, overhaul, repair, alteration points joint position, fault
checking and pre trial etc. must be measurement of power
transformer winding DC resistance. Its purpose is:
Check the quality of welding wire and wire windings;
Check the location of each switch contact is good;
Check the winding or lead wire is broken at;
Correctness check parallel branches, the existence of
winding consists of several parallel wire wound into one or several
broken;
Inspect layer, interturn short phenomenon.
Microcomputer control, large screen backlit LCD screen
display, simple operation, clear display and friendly man-machine
interface, measurement and instrument working state prompt fully
clear without operator memory too many rules in the application of
the instrument interface design; current source is adopted for linear
compensation, stability test, high measuring accuracy, fast and

7
improves the measuring efficiency, reduce the operating personnel
As the strength. The technology used on "four ends" measurement,
eliminate the measurement errors caused by the lead resistance
and contact. With over-voltage protection function, can prevent the
electric potential impact. Panel printer can quickly print
measurement results (selection). Small size, light weight, easy to
carry.
Measurement and analysis of the utility model is suitable for all
kinds of inductive low resistance power transformer, transformer
winding etc.
II. Technical indicators
2.1 main technical indicators:
The measuring range: 0 ~ 2000Ω. (a total of six files)
Testing current: 5A(20mΩ～2Ω)；0.5A(20Ω)；0.05A(200Ω)；
0.005A(2000 Ω).
The resolution: 1μΩ (20mΩ file); 10μΩ (200mΩ file); 0.1mΩ
(2Ω file); 1mΩ (20Ω file); 10mΩ (200Ω file); 0.1Ω (2000Ω file).
Accuracy: 1mΩ~2000Ω (±0.5% RDG ±2 D).
2.2 other:
Power consumption: less than 100W
Working temperature and humidity:0℃～40℃；≤85%RH

8
Withstand voltage: ac1.5kv 50Hz 1min
Working power supply: AC220V 50 Hz (±10%)
Size: 350mm (L) * 260mm (W) * 140mm (D)
Weight: About 3kg
2.3 appearance: (see figure below)
1.LCD display; 2 test button C1; 3 test button P1; 4 test end button P2;
5. test end button C2; 6. printer; 7. operation keys; 8. power switch;
9.AC220V power supply jack; 10. ground terminal button
III. Method of use
3.1 will be connected with test equipment, special test line is
equipped with instruments, according to the connection, while
ensuring that all test fixture clamp connection is firm and reliable.

9
3.2 open instrument power switch, instrument display
"welcome" and later in "range selection interface, this time with" to,
get down "keys to move the cursor, need to set the measuring
range selection, click" confirm "key instruments to measure.
3.3 enter the measurement instrument state, LCD screen
display charging simulation, to be charged after the completion of
LCD numerical display, as the tested equipment DC resistance
value, then press the "confirm" key values will be saved and lock.
When the screen long time display "out of range", press the "back"
button to return to the previous menu, select a high test range or re
testing, please check whether the open loop test.
3.4 instruments into the data interface lock, press the "print"
key data will be printed, printing data after the instrument will
automatically discharge after discharge, to return to the previous
menu.The end of the test.
Note: test status, the user needs to press the "return" key, can
return to the superior menu.

10
IV. Failure analysis and troubleshooting
Failure
phenomena
Cause analysis
Elimination
method
remarks
Boot without any
display
1) power is not
connected
turn on electricity
Replacement of
the insured shall
be replaced with
the same type of
insurance pipe
can not be
replaced by
other models
2) the instrument 2A
insurance pipe is not
installed or
Circuit breaker
Re install the
insurance tube or
replace the
insurance tube
No current output
1)to open inspection
equipment
Inspection
equipment
Trouble shooting
2) test circuit has
open circuit fault
Check the test
circuit and remove
the open circuit
fault.
V. Matters needing attention
The instrument must be grounded reliably in the
5.1 test.
5.2 when the instrument begins to measure do not touch the
test fixture, so as to avoid the electric potential.
5.3 end of the test, waiting for full discharge after the

11
demolition of the test fixture, demolition do not touch any metal
parts.
5.4 initial measurement, the instrument display numerical jitter
or short time display "beyond the range", is due to the test
equipment is not fully charged, waiting to read after the completion
of a stable display value.