Huazheng HZ2321 User manual

HZ2321
Contact Resistance Tester
USER MANUAL
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for choosing HZ2321 Contact Resistance Teste r.
We hope that this instrum ent can mak e your wo rk easier an d mo re
en jo ya bl e, so tha t you can ge t th e feeli ng of office aut omat ion in the test
an d analysis work.
Before using the instrument, please read this man ua l, an d op er ate and
maintain the inst rume nt ac cording to the manual to pro long its service li fe.
"Just a lig ht pr ess, the tes t will be complete d aut omatically" is the
op er atin g charact eristics of this inst rument.
If you ar e sat isfied wi th th is in st rument, please tell your col le ag ue s;
if yo u are no t sat isfi ed wi th th is inst rume nt, ple ase call (03 12 ) 6775656 to
tell you to serve you at all times-Baoding Huazheng El ec tric Man ufacturing
Co. , Ltd., our com pa ny will definitely mak e you satisfied !

Contents
I.Main Technical Specification and Using Condition...................................................................1
II.Function Instruction of The Panel.............................................................................................. 1
III.Instructions....................................................................................................................................2
IV.Common Breakdowns and Methods........................................................................................ 3
V.Packing List....................................................................................................................................4

1
According to the requirements of power equipment preventive test rules, the test of
contact resistance of various switchgear is one of the conventional test items. The tester
outputs DC constant current of 100A and 200A. The tester has the advantages of simple
operation interface, high precision, strong anti-interference ability, good repeatability,
small main body size, light weight and easy to carry. The tester has a
thermal micro printer, which is convenient to print the current test results and is practical.
I.Main Technical Specification and Using Condition
1.Technical specification
Test Current
100A
200A
Test Range
0 mΩ~ 20mΩ
0 mΩ~ 10mΩ
Test Times
10S、60S
Accuracy
±（0.5%×R+1μΩ）
Resolution ratio
0.1μΩ
External dimension
340mm×255mm×240mm
Weight
8kg
2.Using condition
Environment temperature：-10℃~40℃
Environment humidity：≤80%RH
Power supply：AC 198 V~242V
Power frequency：(50±1)Hz
II.Function Instruction of The Panel
Diagrammatic sketch of the panel：

2
-I
+ I
-V
+ V
Contact Resistance Tester
AC220V 10A
RESET TEST PRINT
RESET：Select current or reset tester.
TEST：Start testing
PRINT：Print the result data.
AC 22 0V：AC220V power（Fuse 10A）
：Ground terminal
+I -I：Current terminal
+V -V：Voltage terminal
III.Instructions
3.1 Connect the AC 220V power and connect Earth with ground terminal of tester.
Connect the switch and instrument with the wire according to Figure 1. The test wire which
clamp terminal connect to tested switch, and insert terminal connect to +I、-I 、+V、-V.
+I、-I are thick wires and +V、-V are thin wires.
+V
-V
-I
+I
Figure 1
Warnings: one of the switch terminals must be connected with the earth properly
before connecting the testing wire when the switch is in electric field environment

3
3.2 After the power on, the LCD displays Test current 200A and Test times 10s.
3.3 You can press“RESET”key to select the test mode：
3.4 You can press “TEST” key to start testing, and the LCD displays as shown in the
following figure.
The resistance of the switch is then displayed on the LCD. When the test time reaches
10s or 60s, the test is completed. The instrument automatically turns off the DC constant
current of 100A or 200A supply, and the LCD flashes to display the resistance value of the
switch.
3.5 After the LCD flicker shows for a period of time, the tester re-enters the mode of
operation selection state. At this point, press the print key to print the current data results.
3.6 After the test, turned off the power and remove the power line and test wires.
IV.Common Breakdowns and Methods
1.The fuse blow after pressing ‘TEST’
Constant - current power supply is fault.
2.Instrument displays
2.1 Current circuit impassable, check test line and clamp
2.2 The resistance of the test product is too large or the test wire is too fine to reach the
selected test current.
2.3 Constant - current power supply is fault
3. Instrument displays
The resistance of the test product is out of range.
No current
Out of range
Test current：200A
Test times：10s
Test current：200A
Test times：60s
Test current：100A
Test times：10s
Test current：100A
Test times：60s
Test current：200A
Test times：10s
Testing 2s

4
4. Instrument displays
The wire on +V、-V is not good connected causing data instability.
V.Packing List
NO.
Item
Qty
1
Main machine
one
2
Power wire of AC220V
one
3
Testing wire
one
4
Earth wire
3 meters, 15 meters, one each
5
Experimental resistance
one（375uΩ）
6
Fuse
two（10A）
7
Paper of micro printer
two
8
Product specification
two
9
Product certification
one
10
Inspection report
one
Data instability