Huazheng HZ2376 User manual

HZ2376
Contact Resistance Tester
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for choosing HZ2376 Conta ct Resistan ce Tester.
We hop e tha t this in st rument can make your wo rk easier and more
en jo ya bl e, so th at you can get the feeling of office automat io n in the test
an d an al ys is wo rk.
Before us ing the inst rume nt, pl ea se read this man ua l, and op er ate and
maintain the instrument accordi ng to the ma nu al to pro long its se rvice life .
"Just a li gh t press, the test wi ll be completed aut omatically" is the
op er ating cha racteristics of this instrument.
If yo u ar e sat is fied wi th this instrum en t, please tell your colleagues;
if y ou ar e no t sa ti sf ie d w it h th is in st rum e nt , pl ea se ca ll ( 03 1 2) 6 77 5 511 to
te ll you to serv e you at al l times -Bao di ng Hu az he ng Electri c Manufactu ring
Co. , Lt d., our company wi ll defi ni tely make you satisfie d!

Contents
I.Description .......................................................................................................................... 1
II.Product Features ............................................................................................................... 1
III.Technical Parameters ....................................................................................................... 3
IV.Operating Principle ........................................................................................................... 4
V.Panel Description and Wire Connection ........................................................................... 4
VI.Operating Procedure ........................................................................................................ 5
VII.DC Constant Current Source Function ......................................................................... 11
VIII.Mobile Phone Control and Data Transfer (BT communication) .................................. 12
IX.Failure Analysis and Trouble Shooting .......................................................................... 14
X.Attentions .........................................................................................................................14
XI.Transportation and Storage ........................................................................................... 14

1
I.Description
Contact Resistance Tester is made and contained of advanced high-power switching
power supply technology and advanced electronic circuit. It is the dedicated tester for the
resistance of high and low switch, cable wire and welding joint. Its current uses national
standard GB736 recommended standard DC, can measure the resistance value of being
tested object under standard current status. The tester is small dimension, light weight, strong
anti-interference, high precision, easy operation and perfect function protection and so on.
II.Product Features
1.Color Touch Screen: 800*480 high resolution color 7’’ touch screen, user interactive
interface, high-speed thermal printer.
2.Large-range current output ：Adopt the latest power supply technology, long time
continuously output big current, large-range current output. Can set 1 to 3 different current
range for testing, and automatically calculate average value.
3.Digital displaying data information：Resistance, voltage, current, electrical resistivity，
resistance values at converted standard temperatures.
4.Auto-alarm of over limit ：Set resistance up-limit value of pass / over limit / invalid,
automatically generate testing status.
5.Long-time testing: Can set test time from 0-9999s and support long-time working.
Inside cold-wind heat dissipation, switch power automatically protection.
6.High-precision measurement: Use Operational amplifiers from precision instruments
and High precision quadruple integral A/D converter.
7.Latest System IC ：Use High performance 32-bit latest ARM chips, System
automatically switch magnification times based on signal, ensure testing precision.
8.Inside Calendar & Clock：provide accurate time of testing and printing.
9.DC constant current source function：Can output current from 0 to infinite value, built-in
current step-by-step up-flow test, equal to another powerful DC constant current source for
test.
10. Large-volume testing record storage：Build-in large capacity storage for look up, also
have data protection function while power shut down suddenly.
11. Removable USB flash drive data access：Expert word file data record.
12. Standard Modbus-RTU: Build-in RS232 port (customized convert to RS485),
communication protocol Modbus-RTU.
13. Blue tooth control and upload data ：Standard configuration blue tooth function,

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build-in android BT APP for data control / upload / generate word file.
14.Convenient cable operating ：Cable control mode (customized), set cable control
switch to regulate open / touch, test / interruption, light-alarm for resistance output over limit.
14.Quick and convenient wireless remote controller：it is customized, with one button
operation of testing and interruption, customized controller can show the test progress.
15.Temperature offset automatically calculate resistance ：Can preset temperature,
automatically calculate resistance in standard temperature. Also use temperature sensor
(customized) to measure.
16.Background color change: Set background color to blue and graphic black, brightness,
standby brightness and time.
17.Build-in training material：Document shows the cable connecting method for onsite
guidance.
18. input test information：Key in test spot, equipment, person, remark etc, convenient to
remark and store test data and printing.
19. Big current cable quick connection: Use latest big current cable port, insert and turn
lock up.

3
III.Technical Parameters
Selection
100A
200A
300A
400A
500A
600A
10-5000A
Measurem
ent range
100A
customized
100A
200A
custo
mized
100A
200A
300A
customized
100A
200A
300A
400A
customized
100A
200A
300A
400A
500A
customized
100A
200A
300A
400A
500A
600A
customi
zed
Current
customized
1, two-phase
2,
three-phase
Test range
019999 expandable
Test
precision
0.5%rdg±10dgt
Resolution
0.01
Working
power
AC 220V10% 50Hz2%
Length(m
m)
450
450
Width(mm)
250
250
Height(mm
)
220
280
Weight(Kg
)
9.9
12.9
Environme
nt
temperatur
e
－25C50C
RH
90%RH
IV.Operating Principle
Intelligent Circuit Resistance Tester adopts current and voltage method test principle,
also called four-wire test technology, principle shows as below picture 1.
Picture 1, Test Principle

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Current source have two-end“I+ 、I- (called ‘I’ shape), supply current for being tested
resistance Rx, current value can be read by amperemeter I，voltage of Rx“V+、V-” (called ‘V’
shape) read by voltmeter V. So to calculate resistance value by the measurement of I and V.
V.Panel Description and Wire Connection
Picture 2
Picture 2 shows the reference of single-phase tester, please refer to real object. Three-phase
tester is totally different.
GND：Connecting with land grounding.
Power socket：Input AC220V power, switch, fuse inside, light indicator inside switch.
Cable connecting point：There have four posts, outer side are two bigger posts connecting
with current cable, inner side are two smaller posts connecting with voltage (cable wire),
please connect cable matching with red / black / big / small indication, red is positive, black is
negative.
Three-phase connecting post is separately for A,B and C, A is yellow, B is green, C is red.
Touch color screen ：800*480 pixel dot matrix touch color LCD screen, very visible under
sunshine and dark environment.
Thermal printer：Build-in a thermal printer in the tester. Thermal paper can be used for data
printing on one side, can not on the other side. Only around three months recording on the

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thermal paper, can not used for long time storage.
RS232 port: RS232 is a serial communication interface port, normal configuration is RS232
(customized RS485). Communication protocol is Modbus-RTU（9600-N-1），please contact
us if need because it is not provided align with product shipment.
USB：It is removable U storage connecting port, but can not connect and communicate with
computer, also export test data.
GPI：GPI port connects with temperature sensor, also used for external cable and alarm light.
Attentions: There have some tips and cable connection diagram.
Bluetooth：Bluetooth connects with computer for communication. Contact with us for BT APP
requirement, not provided with product shipment.
VI.Operating Procedure
Normal operating process is shutdown cable connection, power on, settings, test, data
storage, printing, shutdown and remove cable, totally it is 7-setp.
(1)Cable connection
Under shutdown status, please connect GND cable, power cable, test cable. Refer to the
cable connection diagram in ‘help’ menu. Tighten the big current clamp, small current clamp
must tight touch with being tested object, two small voltage clamps are in inner side of current
clamp.
Picture 3

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(2) Power on
After power on, refer to the diagram showing as picture 4.
Picture 4, main interface
Right up zone：1st row shows test status (pass / over limit / invalid). Middle side large letter
shows resistance, voltage and current. 3rd row shows actual test resistivity and actual
temperature. Next row shows converting data as converted resistance, converted resistivity
and normal temperature.
Left up zone：Shows initial resistance average value, resistivity average value, converted
normal temperature resistance average value, converted normal temperature resistivity
average value.
Left down parameters zone：Set three output current range, test time, resistance up-limit
alarm value, being tested resistance length and section area.
Right down test zone：（1）three buttons stands corresponding
each test data of three current range. Green stands for having data, black shows no data.
Selected button (yellow frame) shows the test data of selected current range. （2）Message
box：brief description, remind operating process.（3）System date and time.（4）Order button：
Function, Setting, Test, Help.
Click“Function”button and“Help”button, shows popup menu for each detail operating.

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Picture 5, menu item
(3)Set test parameters In main interface, press“Setting”button enter parameters interface.
See picture 6:
Picture 6, Parameters setting interface
Do parameters’ settings through drop-down menu by digital key board, Press“OK”button
to save parameters in system, not impact by power off and re-open.
Current test times and output current ：In the interface to set “current times”stands for
different current range to calculate average value, can select [I1], [I1/I2], [I1/I2/I3]. [I1] is only
for output I1 current test. [I1/I2] is for output I1current test first, and then output I2 current test.
I1/I2/I3 is for
output I1 current test first, then output I2 current test, finally output I3 current test.
Test Time：Set from 1 to 9999s.