Microtest CT-8750 User manual

4-Wire Precision Cable/Harness Tester
8750
User Manual
MAR 2016

CT-8750 User’s Guide
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Professionalism and Technology Innovation are our
philosophy in designing and marketing our T&M
instruments in satisfying our customers. We
achieved ISO-9001 international quality standard
certification and also many patents as well.
We trust Microtest can be your best partner.
Thank you for purchasing
Microtest’s products!
Our Products include:
Transformer Tester
LCR Meter
Cable/Harness Tester
Power Cord Tester
Universal Function Tester
Network Device Tester
ICT (In-Circuit Tester)
DC Fan Tester
Motor Tester
“Good tools are prerequisite the successful execution of a job”
read and follow all instructions and installation carefully,
the product can provide you the best!
Version (1.0)

CT-8750 User’s Guide
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CHAPTER I GENERAL EXPOSITION................................................................................................................ 5
I.1 PACKAGE & EQUIPMENT ...................................................................................................................... 5
I.2 SYMBOL & WORD................................................................................................................................. 5
I.3 GENERAL OPERATION GUIDELINES...................................................................................................... 6
I.4 TESTER TOUR ........................................................................................................................................ 7
I.4.A THE FRONT PANEL ................................................................................................................................ 7
I.4.B THE POINTS ........................................................................................................................................... 8
I.4.C THE REAR PANEL ................................................................................................................................. 10
I.5 SYSTEM INSTALLATION ....................................................................................................................... 11
I.6 KEY DEFINITION .................................................................................................................................. 11
I.6.A SYSKEY GROUP .................................................................................................................................... 11
I.6.B FASTKEY GROUP.................................................................................................................................. 11
I.6.C EDITKEY GROUP .................................................................................................................................. 12
I.6.D [ENTER] CONFIRMATION............................................................................................................... 12
I.6.E [TEST] TO START TEST .................................................................................................................... 12
I.6.F [RESET] SYSTEM WILL BE RE-STARTED WHEN PRESSED TO PERFORM THE ............................... 12
WARM STA RT. ..................................................................................................................................................... 12
I.6.G SOFTKEY GROUP ................................................................................................................................. 12
CHAPTER II SYSTEM FUNCTION AND CONFIGURATION......................................................................... 13
II.1 SYSTEM FUNCTION ............................................................................................................................. 13
II.1.A SELFTEST.............................................................................................................................................. 14
II.1.B SYSTEM VERSION INFORMATION....................................................................................................... 15
II.1.C CALIBRATION....................................................................................................................................... 16

Contents
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II.1.C.A OPEN/SHORT CALIBRATION ............................................................................................................... 17
II.1.C.B CONDUC TANCE CALIBRATION ............................................................................................................ 18
II.1.C.C DC H//V CALIBRATION ........................................................................................................................ 19
II.1.C.D AC H/V CALIBRATION .......................................................................................................................... 20
II.1.C.E INSULATION CALIBRATION ................................................................................................................. 21
II.1.D PIN SEARCH ......................................................................................................................................... 22
II.2 SYSTEM SETUP .................................................................................................................................... 23
II.2.A SYSTEM ENVIRONMENTS SETUP ....................................................................................................... 23
II.2.A.A POWER ON SELF-TEST ........................................................................................................................ 24
II.2.A.B POWER LINE FREQUENCY................................................................................................................... 24
II.2.A.C KEY STROKE SOUND............................................................................................................................ 24
II.2.A.D KEY OPERATION .................................................................................................................................. 25
II.2.A.E LCD CONTRAST.................................................................................................................................... 26
II.2.A.F LCD INVERSE........................................................................................................................................ 26
II.2.A.G LANGUAGE .......................................................................................................................................... 26
II.2.B TEST ENVIRONMENT SETUP............................................................................................................... 27
II.2.B.A TEST ALARM........................................................................................................................................ 27
II.2.B.B DISPLAY TEST DATA ............................................................................................................................. 28
II.2.B.C PRINTER DATA REPORT ....................................................................................................................... 28
II.2.C DATE & TIME SETUP............................................................................................................................ 28
II.2.D PASSWORD SETUP .............................................................................................................................. 29
II.3 PRINT FUNCTION ................................................................................................................................ 30
II.4 OPEN/SHORT SETUP & TEST .............................................................................................................. 31
II.4.A O/S THRESHOLD SETUP ...................................................................................................................... 31

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II.4.B O/S SCANNING SPEED ........................................................................................................................ 31
II.4.C O/S END DETECTION........................................................................................................................... 32
II.4.D INT. S/O STOP MODE .......................................................................................................................... 32
II.4.E INT. O/S TIMER .................................................................................................................................... 32
II.5 STATISTIC REPORT ............................................................................................................................... 32
CHAPTER III SEQUENCE TEST SETUP........................................................................................................ 34
III.1 TEST CONDITION SETUP ..................................................................................................................... 34
III.1.A OPEN/ SHORT...................................................................................................................................... 34
III.1.B CONDUCTANCE SETUP ....................................................................................................................... 35
III.1.C R/L/C SETUP ........................................................................................................................................ 36
III.1.D TEST MODE EDIT................................................................................................................................. 40
III.2 RUN THE SEQUENCE TEST.................................................................................................................. 41
III.2.A RUN THE REAL TIME SEQUENCE TEST ............................................................................................... 41
III.2.B RUN THE EXISTED SEQUENCE TEST ................................................................................................... 42
III.3 FILE MANAGEMENT............................................................................................................................ 43
III.3.A OPEN FILE............................................................................................................................................ 43
III.3.B OPEN NEW FILE................................................................................................................................... 44
III.3.C DELETE FILE......................................................................................................................................... 44
III.3.D SORT FILE............................................................................................................................................. 45
III.4 VIEW MODE ........................................................................................................................................ 46
APPENDIX A、CT-8750 CABLE SETS....................................................................................................... 47
APPENDIX B、CT-8750 TEST RANGE AND FUNCTION .......................................................................... 49
APPENDIX C、CT-8750 SPECIFICATION ................................................................................................. 50

CHAPTER I General Exposition
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Chapter I
General Exposition
I.1
Package & Equipment
Standard equipment included in the CT-8750 professional Cable/Harness Tester
are listed below:
CT-8750 Pro. Cable/Harness Tester x1
Power cord & Power line adapter x1
User’s Guide x1
Pin search probe x1
Connection cables x2
Test report x1
Din to horn converter x2
I.2
Symbol & Word
[xxxx] Fast Key (i.e. [TEST])
Sy[xxxx] SoftKey, y is the no. of Softkey (1~6),
xxxx is the Function (i.e. S2[PROG])
{xxxxxxxx} Message on LCD
|xxxx| Selecting items on LCD ( i.e.|ON|)
<Pxx> Reference pages (i.e.<P21>)
(xxxx) English exposition

Operation Procedure
Notice/Attention
Shortcuts

CT-8750 User’s Guide
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I.3
General Operation Guidelines
Alphanumeric Input: When save a file that need key in alphanumeric, this
series is use the Edit Key. The first time pressing is number, the second to
fourth pressing each meaning follow the number key from left to right side
of the top capital, For example as below:
Key Key Pressed LCD Display
1 1 1
1 1
1 2 1A
1 1A
1 3 1AB
Move Click[←][↑][→][↓]to move cursor
Confirmation Press [Enter]to confirm
Test/Exit Press [TEST]to start test，[Exit] to exit
Shift Press [Shift] to launch alternative function

CHAPTER I General Exposition
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I.4
Tester Tour
I.4.A
The Front Panel
(1) LCD Display
(2) S1~S6 SoftKeys
(3) PASS & FAIL & HIPOT LED Indicator
(4) EditKey Group
(5) MoveKey Group
(6) Fastkey Group
(7) SysKey Group
(8) Power Switch
(9) HV Calibration Output
(10) Pin Search Connector
(11) 32 Pin Fixture Connector Slot (4 Slots are shown with 256 Pins. Only A and
B two slots equipped with standard 64 pins)

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I.4.B
The points
(1) This series is 4 Wire measurement, it can test micro-resistance, but each test
point must have 2 connected point with instrument.
(2)
4 Wire measurement test
2 Wire measurement test
The 4 wire measurement greater the accuracy
(3) Wiring map
under impedance test
Error Source
Current Source Under Test
Measurement
Device
Current Source Under Test
Measurement
Device

CHAPTER I General Exposition
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(4) When change over from 4 wire to 2 wire measure mode, simply short 2
pins together then connect to D UT.
(5) When the 4 wire circuit connect incorrect that will lead to the unforeseen
test result.
(6) Please use the fixture wiring function to test the fixture wiring whether
correct or not.

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I.4.C
The Rear Panel
(12)
(13)
(14)
(15)
(16)
(17)
(12) RS-232 Port
(13) USB Port
(14) Remote Port
(15) Printer Port
(16) AC Power Input Port (220V/5A/50Hz)
(17) Fan
Please make sure AC voltage setting is consistent with applied voltage.
Please make sure the AC power is grounding.

CHAPTER I General Exposition
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I.5
System Installation

Operation Procedure
(a) Be sour the AC input voltage selecter on the rear panel, power supply is set
to the proper position (AC 115 or 230V)
(b) Connect the converter and DUT cable
(c) Turn on the power the system will process self –test
(d) After self-test, LCD will display the READY SCREEN as below
Software Version
Current Time
(e) Press power switch to turn the system off if needed
The self-test will be conducted right after the system is turned on. It will
take 60~80 seconds.
At the {READY} status, (Ready Screen display), Softkey S1 to S6 have the
following functions.
S1 Higher LCD contrast
S2 Lower LCD contrast
S5 Display current software version and time
S6 Select English/Chinese
I.6
Key Definition
I.6.A
Syskey Group
[Func] Function Menu
[Sys] System Configuration Menu
[Print] Printing Menu
I.6.B
Fastkey Group
[O/S] Display the Open/Short Status
[Learn] Open/Short Auto Learning

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[File]File Management
[Stat] Display the statistic information
[Mode] Test Mode Setup
[Cond] Conductance Test Setup
[RLC] Resistance/Inductance/Capacitance/Diode Test Setup
[H.V.] High Voltage Setup
I.6.C
EditKey Group
Alphanumeric key Use for key in alphanumeric, including 0~1 and A~Z,．/
[BS] () Back Space
Cursor Keys Use to move cursors, including[←] [→] [↑] [↓]
And [PgUp] [PgDn]
[Exit] Exit from current status/screen
I.6.D
[Enter] Confirmation
I.6.E
[TEST] To start test
I.6.F
[Reset] System will be re-started when pressed to perform the
warm start.
I.6.G
SoftKey Group
S1~S6 keys are located on the right side of LCD display and correspond for the
auxiliary setup/activate/switch function.

CHAPTER II System Function and Configuration
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Chapter II
System Function and Configuration
System Function and Configuration, including Main Function. System
Configuration Setup and Printing Function, is described detail as following.
II.1
System Function
Main function includes several advanced functions, which are described below:

Operation Procedure
(a) Press[Func]
(b) LCD display as following
(c) Press [↑] or [↓] to select the item needed
(d) Press [Enter] to confirm selection
(e) press[Exit] to return

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II.1.A
Selftest
The SELFTEST routine is to test the CPU, RAM, ROM, EEPROM, and CLOCK.

Operation Procedure
(a) Press [Func]
(b) Press [↑] or [↓] to select the item and press[Enter]
(c) The program is running self-Test function
(d) LCD display as following
←Stop Self-Test
(e) Press [Exit] to return

CHAPTER II System Function and Configuration
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II.1.B
System Version information
This function provides the instrument information including Model/Test
Capability/Software Version/Edition/Released Date/ Total File Space and Free
File Space Operation Procedure
(a) Press [Func], useing [↑] or [↓] to select the item
(b) Press [Enter]，LCD diplay as following
(c) From LCD display shows, you can get the Model/Test Capability/Software
Version/Edition/Released Date/Taotal File Space and Free File Space

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II.1.C
Calibration

Operation Procedure
(a) Press [Func]
(b) Use [↑] or [↓] to select the item
(c) Press [Enter] to enter to the subordinate mune of calibration mode
(d) LCD display as following
(e) Change this function will influence the accuracy of the instrument,
password is require for entering this page.

CHAPTER II System Function and Configuration
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II.1.C.a
Open/Short Calibration

Operation Procedure
(a) Press [Func] and useing [↑] or [↓] to select Calibration
(b) Press [Enter] to enter to the subordinate mune of calibration mode
(c) LCD display as following
(d) Use [↑] or [↓] to select to (1) O/S Cal. And press [Enter]
(e) LCD display as following

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(f) Prsee S1[UP] or S2[DOWN] to adjust code
(g) After Setup finished, press S5 [DONE] to save or S6 [QUIT] to exit without
saving the setup
II.1.C.b
Conductance Calibration

Operation Procedure
(a) Opoeration the same O/S Cal. In the subordinate menu of calibration mode,
using [↑] or [↓] to select (2)Cond. Cal. Item, LCD display as following
(b) Press [Enter], LCD display as following
(c) Press S1[UP] or S2[DONT] to adjust code
(d) After setup finished, press S5 [DONE]
(e) If you want to abandon data, press S6[QUIT] to exit this screen

CHAPTER II System Function and Configuration
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II.1.C.c
DC H//V Calibration

Operation Procedure
(a) Operation is the same before, in the subordinate mune of calibration mode,
using [↑] or [↓] to select (3) DC H/V Cal , LCD display as following
(b) Press [Enter], LCD display as following
(c) Press S1[UP] or S2 [DOWN] to adjust code, let the reading value match or
closer to the standard voltage as much as possiable
(d) Aslo you can press S4 [AUTO] adjust code automatically
(e) After setup finished, press S5 [DONE] to save
(f) If you want to abandon data, press S6[QUIT] to exit this screen