Microtest 626 Series User manual

3 in 1 Transformer Testing System
626X+7721+7605
User Manual
Ver. 1.01
September-2020

Copyright and Trademark
Do not attempt to reproduce any part of this publication or transmit it by
any form or method, whether through electronic, mechanical, copying,
recording or other means, without the prior written permission of
Microtest Co., Ltd. We shall neither be subjected to any responsibilities
or obligations for the information contained in this Manual nor bear
damage responsibility resulting from the use of the information contained
herein. All brands and trademark are the properties of Microtest Co., Ltd.
Microtest Co., Ltd. and its affiliates shall not be liable for the damage,
losses or costs incurred due to the accidental use, misuse or abuse by the
product buyer or the third party; or the unauthorized modification, repairs
or change of the product; or the failure in following the operation and
maintenance instructions established by Microtest.
The content and the product specifications shall be subject to change
without further notice.
2015 @ Microtest Corporation. All rights reserved.

Contents
Chapter 1 Notes ......................................................................................................................... 6
1.1 Safety Signs................................................................................................................. 6
1.2 Electrification and Electric Shock............................................................................... 6
1.3 Grounding ................................................................................................................... 6
1.4 Power .......................................................................................................................... 7
1.5 Warm Up..................................................................................................................... 7
1.6 External control unit.................................................................................................... 7
1.7 Machine Malfunction.................................................................................................. 8
1.8 Ending the test............................................................................................................. 8
1.9 Placement and Storage ................................................................................................ 8
1.10 Emergency Handling................................................................................................... 8
1.11 General instructions .................................................................................................... 8
1.12 Static............................................................................................................................ 9
Chapter 2 General Descriptions................................................................................................. 9
2.1 Features ....................................................................................................................... 9
2.2 Package and Accessories........................................................................................... 11
2.3 Front panel ................................................................................................................ 11
2.4 Rear panel.................................................................................................................. 12
2.5 Fixture F7721 ................................................................................................................ 13
2.6 Setting process............................................................................................................... 14
Chapter 3 6265/ 6266/ 6267 Function Setting......................................................................... 14
3.1 Main Menu................................................................................................................ 14
3.2 System Setup (SYSTEM) ......................................................................................... 16
3.3 Transformer Setting Menu ........................................................................................ 23
3.3.1 WINDING/FIXTURE Setting................................................................................ 23
3.3.2 Test Sequence Setting............................................................................................. 25
3.3.3 L/Lk/Q/Rac/Z/D/θ/X/Y Setting.............................................................................. 26

3.3.4 Rdc Setting ............................................................................................................. 30
3.3.5 Turn Ratio Test Setting .......................................................................................... 34
3.4.6 Capacitance Testing Setting ................................................................................... 37
3.3.7 Balance Test Setting............................................................................................... 41
3.3.8 Pin Short Test Setting............................................................................................. 42
3.3.9 Correction Setting................................................................................................... 43
3.3.10 Complete Deviation Setting ................................................................................. 44
3.4 Test Mode ................................................................................................................. 46
3.5 File Management....................................................................................................... 47
3.5.1 Loading File............................................................................................................ 47
3.5.2 Saving As ............................................................................................................... 48
3.6.3 Creating New File................................................................................................... 49
3.6.4 Deleting File ........................................................................................................... 50
Chapter 4 7721 Function Setting............................................................................................. 51
4.1 System Setup Menu (Sys) ......................................................................................... 51
4.1.1 System Setup .......................................................................................................... 51
4.1.2 Test Configuration.................................................................................................. 52
4.1.3 Date & Time........................................................................................................... 54
4.1.4 Password................................................................................................................. 55
4.2 Function Menu (Func)................................................................................................... 56
4.2.1 Self-test................................................................................................................... 57
4.2.2 Surge voltage calibration........................................................................................ 58
4.2.3 Surge voltage test ................................................................................................... 59
4.2.4 About….................................................................................................................. 59
4.3 Test Setting Menu (Set)................................................................................................. 60
4.3.1 Fixture/ Sequence ................................................................................................... 60
4.3.2 Insulation ................................................................................................................ 62
4.3.3 Hipot test setting..................................................................................................... 63

4.3.4 Surge(L/S) .............................................................................................................. 65
4.3.5 Wire ........................................................................................................................ 69
4.3.6 L, Lk, Rdc, TR, C................................................................................................... 70
4.4 File................................................................................................................................. 70
4.4.1 Load........................................................................................................................ 71
4.4.2 New ........................................................................................................................ 71
4.4.3 Save as.................................................................................................................... 72
4.4.4 Delete...................................................................................................................... 72
4.5 Statistics(Stat)................................................................................................................ 73

Chapter 1 Notes
This instrument is not suitable for outdoor use, especially in humid or
highly dusty locations. Improper use of this instrument may result in
electric shocks. Please read the safety descriptions carefully before using
this tester in order to avoid improper or wrongful use and causing accidents.
1.1 Safety Signs
Caution:
Please read the content of this Manual carefully.
High-voltage hazard
symbol:
The output terminal may release lethal voltage.
Please read the safety instructions described in
this chapter.
Grounding：
Before working with this tester, be sure to
connect this terminal with the ground to prevent
from touching the housing as to cause
electrocution accident due to current leakage.
Warning sign：
If the product is improperly used, it may cause
adverse results to the instrument or the Test Piece.
If the product is improperly used, it may cause
injury or even death.
1.2 Electrification and Electric Shock
In order to prevent electric shocks, the wearing of insulating plastic gloves is
recommended before using this tester to perform testing related tasks.
1.3 Grounding
The back panel of the instrument is fitted with a safe ground terminal. Be sure to
connect this ground terminal to the ground to prevent the operator from touching the
housing as to cause the electrocution.

1.4 Power
6265/ 6266/ 6267:
Power cables that comply with the local country specifications must be used, and
connectors applicable to IEC320 connectors must be used for the connection of this
instrument. Users must ensure that the ground cable is properly grounded. If a fuse is
included in the power plug, use fuses that comply with 0.8 ampere safety regulations.
Ensure that AC power is used before use and adjust the 115V/230V power selection
switch on the rear panel so that the machine matches the local power voltage.
7721, 7605:
The scope of power used by this instrument is 98Vac ~ 132Vac or 192Vac ~ 264Vac.
To insert the power source, please check if the power to be connected is identical to
the power-shifting sign indicated on the back panel. When changing the fuse, it is
required to use a specific type of fuse designed in the same ampere to prevent the
electrical wire from burning. Before making any replacement, please remove the plug
to prevent danger.
1.5 Warm Up
The tester can operate normally once the power is turned on; however, in order to
achieve the accuracy within specification, please turn on the machine in advance and
let it warm up for 30 minutes or more before use.
1.6 External control unit
This unit is able to execute external control. For this purpose, please ensure that the
operator is not touching the signal output end and the Test Piece to avoid causing a
hazard.

1.7 Machine Malfunction
If the tester malfunctions, such as the voltage displayed on the voltmeter differs
greatly from the voltage set, or that the high voltage output warning light remains on
though there is no high voltage output, etc., please stop using this machine
immediately and contact our company or your dealer for repairs.1.7 Test End
Please turn off the power switch when this tester is not in use.
1.8 Ending the test
When not using the instrument, please shut off the Power Switch. To restart the Power
Switch after being disconnected, please wait for a few seconds; however, do not
execute consecutive on/off action of the power.
1.9 Placement and Storage
The normal operating temperature and humidity range of this machine is 5 oC ~ 40 oC,
80% RH; the machine might malfunction if exceeded this range. The storage
temperature and humidity range of this machine is -20 oC ~ 70 oC, 80% RH. In order
to achieve accurate testing and for safety considerations, do not place this machine in
environments with direct sunlight exposure, high temperature, high humidity, frequent
vibrations, or excessive dust.
1.10 Emergency Handling
When there is electric shock or if the DUT or machine goes on fire, please switch off
the power and unplug the power cable.
1.11 General instructions
Do not place any combustible or heavy object on the instrument.
Avoid heavy impact that may damage the machine.
When cleaning the instrument, remove the power plug first and then
wipe with the soft cloth soaked with mild cleanser and fresh water.

If the instrument presents any Tolerance sign, do not attempt to dismantle
it for making repairs; instead, send the instrument to our professional
maintenance personnel for solving the problem.
1.12 Static
This instrument uses components that are very sensitive to static.
The desktop of the work table must be conductive material that is grounded.
When the soldering iron and tools are not in use, their contact end must be in
contact with grounded conductors.
The maintenance staff must wear static bracelets with leakage resistance less than
1MΩ.
The components or assembly base board must be placed in cases with protection
against static.
Chapter 2 General Descriptions
2.1 Features
‒0ne-stop test solution (6265/6266/6267 transformer tester + 7721 Impulse
winding tester + 7605 Hipot tester)
‒The 7721 Impulse winding tester is the main control instrument, which
controls the measurement sequence.
6265/ 6266/ 6267 Transformer Tester:
Frequency:
6265 10Hz~200kHz
6266 10Hz~500kHz
6267 10Hz~1MHz
Basic measurement accuracy: 0.1%.
20 Channels.

7721 Impulse winding Tester
21 channels.
Programmable impulse voltage, low-energy detection without damaging the
DUT.
Built-in storage 200 sets testing waveform.
Storage golden sample (DUT) standard waveform in the instrument, and
compare with the other sample waveform.
Provides 5 waveform comparison.
Hipot Tester
Test voltage:
AC 100V~ 5000V/ Leakage current 31m A.
DC 10V~ 6000V/ Leakage current 11m A.
IR 10V~1000V/ Insulation resistance 12G ohm.
Single channel
Arcing detection.
Adjustable ramp time (0.1s-10s).

2.2 Package and Accessories
Standard accessories included:
Power Cord * 3
User Manual (CD) * 1
Scan Box (F7721) * 1
HV Test Cable * 21
25Pin-25Pin Cable * 1
Remote Control Cable * 1
24V Switch Power Supplier * 1
2.3 Front panel
Figure 2-3-1 in 1 Test System Front panel
1. Power: Power switch.

2. Monitor: This is where the test results are displayed.
3. Soft keys: These keys will be used when you select the functions on the
right side of the display.
4. Number keys: Entering numbers when editing.
5. Function keys: There are Sys, Func, Set, File, Stat, Enter, Exit and Test
keys.
6. Arrow keys: To move up, down, left and right in the screen.
7. 626X BNC connector: This is a BNC output connector, used to connect the
BNC test line of the fixture F7721.
8. 7721 output connector: CH1~ CH20 and COM are the output channels,
used to connect to the CH1~ CH20 and COM of the fixture F7721.
2.4 Rear panel
Figure 2-3-2 3 in 1 Test System Rear panel
1. AC INPUT: Input power jack.

2. Voltage Selector: Please confirm whether the input voltage is 110V or 220V
before connecting the plug, and switch the Voltage Selector to the proper
voltage position (110V/220V).
3. GND: Grounding terminal.
4. F7721 Remote: Use 25P-25P cable to connect between 7721 and fixture
F7721.
5. Interlock: High voltage current output safety switch. Short circuit both ends
of this port during testing for the test voltage output. Opening the circuit of
this port during testing will stop the test and prompt the message.
6. EXT.I/O: Use RJ-45 cable to connect with the connect Remote control of the
fixture F7721.
7. RS-232(PC)/RS-232: When using the 3-in-1 PC software, please use the RS-
232 cable to connect from the RS-232 (PC)/RS-232 connector to the PC.
8. RS-232(6905)/RS-232: Use RS-232 cable to connect with connector RS-
232(6905) and RS-232 between 7721 and 7605.
9. H.V./Return: Use the high voltage cable to connect between 7721 and 7605.
2.5 Fixture F7721
1. Core: To connected with the Core channel on 7721.
2. Fixture head: The test fixture head.

3. Control key: Press start and stop key to control the system and the result
will show by Green (For pass) and Red (For Fail) LED.
4. Channels: CH1~CH20 to connected with CH1~CH20 channels on 7721.
5. Remote control: To connected with EXT.I/O on 626X.
6. Air hose Socket: The socket is for Air hose.
7. DC 24V: To connected with DC 24V adapter
8. Remote: To connected with F7721 Remote on 7721.
9. Test Line: To connected to the 626X/623X BNC output connector.
2.6 Setting process
Chapter 3 6265/ 6266/ 6267 Function
Setting
3.1 Main Menu
Press the Menu control key and the screen will enter the Main Menu screen.
Machine installation
sand wiring
Start
Connect the
7721,623X and F7721
Create the 7721,623X
settings.
Create the 7721,623X
settings.
Start to test

SYSTEM: Enters the system setting screen (System Setup).
METER: Enters the meter measurement mode (Meter Mode).
TRANS: Enters the transformer test setting function screen (Transformer
Setting Menu).
FILE: Enters the file management screen (File Management).

3.2 System Setup (SYSTEM)
Press the Menu control key to enter the Main Menu screen, and then select SYSTEM
to enter the system setting screen.
Figure 3-2-1 System Setup (1/3) screen
1. Trigger delay (mS): Sets the trigger delay time; the setting range is 0~5000 and
the unit is mS. (This function is applicable for Meter Mode and transformer test
mode.)
2. Compare Beep: Sets the time for the buzzer to prompt when the compare function
is enabled in Meter Mode. The Select function key can be used to make selections.
OFF: Disable prompt.
NG: Prompt when any one item exceeded setting range (FAIL).
OK: Prompt only when all items with compare enabled are within the setting
range (PASS).
3. Transformer Test Beep: Test result prompt setting when in transformer test mode;
the Select function key can be used to make selections.
ALL: Prompt is enabled whether the test result is PASS/FAIL.
OK: Enable prompt only when the test result is PASS.
NG: Enable prompt only when the test result is FAIL.
OFF: Disable prompt.

4. Handler Interface: Sets Handler Interface function ON/OFF; the Select function
key can be used to make selections.
ON: Enables the Handler Interface function.
OFF: Disables the Handler Interface function.
5. Edit Lock：Edit lock function, if there is a password, it will prompt to enter the
password, and the setting value can be changed after confirming the old password.
ON ：Open the Edit Lock function.
OFF：Close the Edit Lock function.
※If you want to set/change password, you can set it on right side function
key[Set P/W].
6. RS-232 Baud Rate: Sets the baud rate of the serial communication port; the
Select function key can be used to make selections. The following baud rates can
be selected: 115200/56000/384000/19200/9600 bps.
Transmission format: 8/N/1 (8 Data Bit/ No Parity Bit/ 1 Stop Bit)
7. Communication Interface: Communication interface setting; select the
communication interface to use RS-232/LAN.
8. Language: Language setting; the Select function key can be used to make
selections. Three options are available for selection, including English, Traditional
Chinese and Simplified Chinese.

Figure 3-2-2 System Setup (2/3) screen
9. Rescan Interval (x100mS): Sets the time for continual test and continual test
intervals in transformer test mode; the setting range is between 0~100.
 When the value is set as 0, the continual test function is disabled.
 When the value is set between 1~100, the continual test function is enabled
and the time for continual test intervals is the value set x100mS.
Example:
When the value is set as 5, the time for the continual test interval is 500mS.
(5x100mS=500mS)
10. Display Test Data: Sets the display method of the transformer test data.
ALL List: Display on the screen whether the test data is PASS/FAIL.
NG List: Only display FAIL data on the screen.
11. Fail Stop: Sets whether to turn the test fail stop function ON/OFF under
transformer test mode.
ON: Enables test stop function. (When an item is tested as FAIL, the test
stops)
OFF: Disables test top function.

12. Upload Test Data: Sets whether to turn the data upload function ON/OFF under
transformer test mode.
ON: Enables the test data upload function. When the test is complete, the
test data will be automatically uploaded through the communication port
(RS-232/LAN) set.
OFF: Disables the test data upload function.
13. Save Data in USB: Sets whether to turn the save test data to USB flash drive
function ON/OFF under transformer test mode.
ON: Enables the save test data to USB flash drive function; once test is
completed, the test data will be saved into the USB flash drive.
OFF: Disables the save test data to USB flash drive function.
※When this function is enabled, please ensure that a USB flash drive
is connected to the machine.
14. Auto Trigger：In the Trans test mode, turn on/off to set the auto trigger
function.
ON：Open the auto trigger function.
OFF：Close the auto trigger function.
＊WARNING：To avoid cut your hands, please do not using when the fixture
is working by cylinder.
15. Fail Lock：If you need to lock the device when the test result is “fail”.
ON：Open the fail lock function.
OFF：Close the fail lock function.
16. Test Mode Font Size：To set the font display large/small in the test mode.
Large：Test mode font display Large(Default).
Small：Test mode font display small.

Figure 3-2-3 System Setup (3/3) screen
17. Handler Interface Mode：Use the select function key to set the output signal of
Handler Interface are “Pass” or “Fail” in the both of test mode and multi-DUT
mode.
PASS：Will output when each DUT test result is "Pass".
FAIL：Will output when each DUT test result is "Fail".
(The HANDLER INTERFACE pin define can refer the 3.9 Handler Interface)
18. About: Displays the version information and serial number of the machine.
19. LAN Set: Local area network (LAN) communication interface setting.
To allow the instrument to communicate through the local area network (LAN),
the network cable must be connected and its IP address must be configured.