Tonghui TH2840 Series User manual

I
Changzhou Tonghui Electronic Co.,Ltd.
www.tonghui.com.cn
O
OP PE ER RA AT TI IO ON N M MA AN NU UA AL L
TH2840 Series
Automatic Transformer Test System

II
Contents
Chapter 1 Out of Box Audit .......................................................................................................... 1
1.1 To Inspect the package ................................................................................................. 1
1.2 Power connection ......................................................................................................... 1
1.3 Fuse .............................................................................................................................. 1
1.4 Environment ................................................................................................................. 1
1.5 Use of Test Fixture ....................................................................................................... 2
1.6 Warm-up ....................................................................................................................... 2
1.7 Other features ............................................................................................................... 2
Chapter 2 Introduction .................................................................................................................. 4
2.1 Introduction to front panel ........................................................................................... 4
2.2 Introduction to rear panel ............................................................................................. 6
2.2.1 Rear panel description 1 ....................................................................................... 6
2.2.2 Rear panel description 2 ....................................................................................... 8
2.3 Introduction to display zone ......................................................................................... 9
2.4 Main menu keys and corresponding displayed pages ................................................ 10
2.4.1 [DISP] ................................................................................................................ 10
2.4.2 [SETUP] ............................................................................................................. 10
2.4.3 [SYSTEM] ......................................................................................................... 11
2.5 Basic Operation .......................................................................................................... 11
2.6 Power on and off ........................................................................................................ 11
Chapter 3 Description of LCR Function Module ....................................................................... 13
3.1 <Meas Display> ......................................................................................................... 13
3.1.1 Common test conditions ..................................................................................... 13
3.1.2 Test function ....................................................................................................... 13
3.1.3 Scaling position .................................................................................................. 14
3.1.4 Result display of bin sort .................................................................................... 15
3.1.5 Save the bridge test results on the USB flash drive............................................ 16
3.2 <List Display>............................................................................................................ 16
3.2.1 USB flash drive data save .................................................................................. 17
3.3 <Trace Display> ......................................................................................................... 17
3.3.1 Trigger ................................................................................................................ 18
3.3.2 Scale ................................................................................................................... 18
3.3.3 Read ................................................................................................................... 19
3.3.4 Trace ................................................................................................................... 19
3.3.5 USB flash drive data save .................................................................................. 21
3.3.6 Other test results ................................................................................................. 22
3.4 <Meas Setup> ............................................................................................................ 22
3.4.1 Test function ....................................................................................................... 23
3.4.2 Frequency ........................................................................................................... 24
3.4.3 Level ................................................................................................................... 24
3.4.4 Speed .................................................................................................................. 25
3.4.5 Range ................................................................................................................. 26

III
3.4.6 DC Bias .............................................................................................................. 26
3.4.7 Level monitor function ....................................................................................... 27
3.4.8 Trigger ................................................................................................................ 28
3.4.9 Average .............................................................................................................. 29
3.4.10 Automatic level control ...................................................................................... 29
3.4.11 Source resistance ................................................................................................ 29
3.4.12 Deviation and reference ..................................................................................... 30
3.5 <Limit Setup> ............................................................................................................ 30
3.5.1 Compare switch .................................................................................................. 31
3.5.2 Compare count switch ........................................................................................ 31
3.5.3 Comparison function limit mode ........................................................................ 32
3.5.4 Compare parameters ........................................................................................... 32
3.5.5 Deviations and references .................................................................................. 32
3.5.6 BIN Switch ......................................................................................................... 33
3.5.7 High-low limit .................................................................................................... 33
3.6 <List Setup> ............................................................................................................... 33
3.6.1 Total Point .......................................................................................................... 34
3.6.2 Trigger mode ...................................................................................................... 34
3.6.3 List mode ............................................................................................................ 34
3.6.4 Sweep condition ................................................................................................. 34
3.6.5 Parameter function ............................................................................................. 35
3.6.6 High/low limit .................................................................................................... 35
3.6.7 Delay .................................................................................................................. 35
3.7 Trace Setup ................................................................................................................. 35
3.7.1 Common test conditions ..................................................................................... 36
3.7.2 4 sweep parameters ............................................................................................ 36
3.7.3 Spilt .................................................................................................................... 36
3.7.4 Sweep point ........................................................................................................ 37
3.7.5 Sweep Type ........................................................................................................ 37
3.7.6 Trace mode ......................................................................................................... 37
3.7.7 X Format ............................................................................................................ 37
3.7.8 Max-Min ............................................................................................................ 38
3.7.9 Ordinate range setting ........................................................................................ 38
3.8 User Correction .......................................................................................................... 38
3.8.1 Open ................................................................................................................... 39
3.8.2 Short ................................................................................................................... 40
3.8.3 Load ................................................................................................................... 41
3.8.4 Load type ............................................................................................................ 42
3.8.5 Cable .................................................................................................................. 42
3.8.6 Point frequency operation .................................................................................. 42
Chapter 4 System and File .......................................................................................................... 44
4.1 <System Setup> ......................................................................................................... 44
4.1.1 Mode Setup ........................................................................................................ 44
4.1.2 User Setup .......................................................................................................... 45

IV
4.1.3 RS232 ................................................................................................................. 46
4.1.4 LAN ................................................................................................................... 47
4.1.5 Tools ................................................................................................................... 48
4.2 <File> ......................................................................................................................... 49
4.2.1 U-disk manage performance .............................................................................. 50
4.2.2 Introduction to Store/Recall Function ................................................................ 50
4.2.3 Basic menu operation of file management ......................................................... 51
4.2.4 Operation steps for file management ................................................................. 52
Chapter 5 Execute LCR measurement operation and some examples ........................................ 54
5.1 Correction operation................................................................................................... 54
5.1.1 Sweep correction ................................................................................................ 54
5.1.2 Point-frequency correction ................................................................................. 54
5.2 Correct connection of DUT ........................................................................................ 55
5.3 Eliminate the influence of stray impedance ............................................................... 56
5.4 Operation example for testing inductance .................................................................. 57
5.4.1 Test Condition .................................................................................................... 57
5.4.2 Operation steps ................................................................................................... 57
5.5 Operation example of testing capacitance by multi-frequency list sweep ................. 58
5.5.1 Test condition ..................................................................................................... 58
5.5.2 Operation steps ................................................................................................... 58
5.6 Operation example of load correction ........................................................................ 60
5.6.1 Operation steps ................................................................................................... 60
5.6.2 Note .................................................................................................................... 60
Chapter 6 Transformer Single-machine Test .............................................................................. 61
6.1 Circuit for transformer single-machine test................................................................ 61
6.1.1 Some parameters of transformer ........................................................................ 61
6.1.2 Transformer single test circuit and TURN test ................................................... 61
6.1.3 Transformer leakage inductance test .................................................................. 62
6.1.4 Capacitance test between windings of transformer ............................................ 62
6.2 <Transformer Single Setup> ...................................................................................... 63
6.2.1 Trigger ................................................................................................................ 63
6.2.2 Speed .................................................................................................................. 63
6.2.3 Test Mode ........................................................................................................... 63
6.2.4 Rsou ................................................................................................................... 64
6.2.5 Bias Source......................................................................................................... 64
6.2.6 Comp .................................................................................................................. 64
6.2.7 Parameter Setup ................................................................................................. 64
6.3 <Single Display> ........................................................................................................ 65
6.3.1 Save the test results of a single set of transformers on the USB flash drive ...... 66
Chapter 7 Transformer Auto Scanning Test ................................................................................ 67
7.1 Introduction to scan test function ............................................................................... 67
7.2 Install and connect the scanning test system .............................................................. 67
7.3 Front panel of scanning box ....................................................................................... 68
7.4 Rear panel of scanning box ........................................................................................ 70

V
7.5 HANDLER interface .................................................................................................. 70
7.5.1 Timing diagram of HANDLER signal ............................................................... 70
7.5.2 Distribution and connection diagram for HANDLER........................................ 70
7.6 Example of transformer .............................................................................................. 71
7.7 Clear Settings ............................................................................................................. 72
7.8 <Transformer ID> ...................................................................................................... 72
7.8.1 Transformer ID ................................................................................................... 73
7.8.2 Primary Nums .................................................................................................... 73
7.8.3 Secondary Nums ................................................................................................ 73
7.8.4 Rescan Interval ................................................................................................... 73
7.8.5 Scan Disp Mode ................................................................................................. 73
7.8.6 Fail Rescan ......................................................................................................... 74
7.8.7 Bias On Delay .................................................................................................... 74
7.8.8 Ignore Nom ........................................................................................................ 74
7.8.9 Trigger Delay ..................................................................................................... 74
7.8.10 Cylinder Ctrl....................................................................................................... 75
7.8.11 Scan Box Mode .................................................................................................. 75
7.8.12 Resistance Source ............................................................................................... 75
7.8.13 Bias Source......................................................................................................... 75
7.9 Trans Pin To Fixture ................................................................................................... 76
7.9.1 Pin To Fixture Setup ........................................................................................... 76
7.9.2 Pin Label Setup .................................................................................................. 77
7.10 Pin Setup .................................................................................................................... 77
7.10.1 Trans Pin Setup .................................................................................................. 78
7.10.2 Series Pins Setup ................................................................................................ 79
7.10.3 Parallel Pins Setup .............................................................................................. 79
7.11 <Trans Condition> ..................................................................................................... 80
7.11.1 Frequency, voltage, switch and scanning sequence ............................................ 81
7.11.2 TURN Test Conditions Setup ............................................................................. 81
7.11.3 Lx Test Conditions Setup ................................................................................... 84
7.11.4 Lk Test Conditions Setup ................................................................................... 87
7.11.5 Cx Test Conditions Setup ................................................................................... 90
7.11.6 Zx Test Conditions Setup ................................................................................... 93
7.11.7 ACR Test Conditions Setup ............................................................................... 96
7.11.8 DCR Test Conditions Setup ............................................................................... 98
7.11.9 PS Test Conditions Setup ................................................................................... 99
7.11.10 BL Test Conditions Setup ................................................................................. 101
7.11.11 Handler Mode Function ................................................................................... 103
7.11.12 Parameter copy function................................................................................... 103
7.11.13 Statistics Page ................................................................................................... 103
7.12 <Trans Scan> ........................................................................................................... 104
7.12.1 Each Display Zone under this page .................................................................. 105
7.12.2 Function Keys under this page ......................................................................... 105
7.12.3 PRI page-turning function ................................................................................ 106

VI
7.12.4 Pin Display Function for Stray Capacitance .................................................... 107
7.12.5 BAL Balance parameter display ....................................................................... 107
7.13 <File> page of Transformer Scan ............................................................................. 108
7.13.1 Transformer scan setup file (*.t40) .................................................................. 108
7.13.2 Operation steps for file manage ....................................................................... 109
7.13.3 Transformer deviation-deduction ..................................................................... 109
7.14 Focus ........................................................................................................................ 110
7.15 Split .......................................................................................................................... 111
7.16 Frequently asked questions and answers in transformer scan test............................ 112
7.16.1 High and low limits .......................................................................................... 112
7.16.2 Measurement item loss ..................................................................................... 112
7.16.3 Measurement interruption ................................................................................ 113
7.16.4 Poor DCR accuracy .......................................................................................... 113
7.16.5 Poor Lk accuracy .............................................................................................. 113
7.16.6 Inaccurate TURN ............................................................................................. 113
7.16.7 Unstable TURN ................................................................................................ 114
7.16.8 Difference between the first and the second Lx ............................................... 114
7.16.9 Poor stability of Cx and Zx open test data ....................................................... 114
7.16.10 DCR and PS open cannot reach infinite large .................................................. 114
7.17 User-made test fixture .............................................................................................. 114
7.17.1 Use TH1801-EXT2A-OUT to make test fixture .............................................. 115
7.17.2 Example of using TH1801-EXT11A(5.0)-B pin signal ................................... 115
Chapter 8 Performance and Test ............................................................................................... 117
8.1 Test function ............................................................................................................. 117
8.1.1 Parameter and symbol ...................................................................................... 117
8.1.2 Test combination .............................................................................................. 118
8.1.3 Mathematical operation .................................................................................... 118
8.1.4 Equivalent mode ............................................................................................... 118
8.1.5 Range ............................................................................................................... 118
8.1.6 Trigger .............................................................................................................. 118
8.1.7 Delay time ........................................................................................................ 118
8.1.8 Connection modes of test terminals ................................................................. 119
8.1.9 Test speed (Frequency>=10kHz) ..................................................................... 119
8.1.10 Average ............................................................................................................ 119
8.1.11 Display digit ..................................................................................................... 119
8.2 Test signal................................................................................................................. 119
8.2.1 Test signal frequency ........................................................................................ 119
8.2.2 Signal mode ...................................................................................................... 119
8.2.3 Test signal level ................................................................................................ 120
8.2.4 Output impedance ............................................................................................ 120
8.2.5 Monitor for test signal level ............................................................................. 120
8.2.6 Maximum measurement display range............................................................. 120
8.2.7 DC bias voltage source ..................................................................................... 120
8.2.8 2A Bias Current Source .................................................................................... 121

VII
8.3 Measurement accuracy ............................................................................................. 121
8.3.1 Accuracy of│Z│,│Y│, L, C, R, X, G, B ......................................................... 121
8.3.2 D accuracy ........................................................................................................ 121
8.3.3 Q accuracy ........................................................................................................ 122
8.3.4 Θ accuracy ........................................................................................................ 122
8.3.5 G accuracy ........................................................................................................ 122
8.3.6 Rp accuracy ...................................................................................................... 122
8.3.7 Rs accuracy ...................................................................................................... 123
8.3.8 DCR accuracy .................................................................................................. 123
8.3.9 Lk accuracy ...................................................................................................... 123
8.3.10 Turns Ratio accuracy ........................................................................................ 123
8.3.11 Accuracy factor ................................................................................................ 124
8.4 Safety requirement ................................................................................................... 127
8.4.1 Insulation resistance ......................................................................................... 127
8.4.2 Insulation intensity ........................................................................................... 128
8.4.3 Leakage current ................................................................................................ 128
8.5 Electromagnetic compatibility ................................................................................. 128
8.6 Performance test ....................................................................................................... 128
8.6.1 Working condition ............................................................................................ 128
8.6.2 The used instruments and devices .................................................................... 128
8.6.3 Function check ................................................................................................. 129
8.6.4 Test signal level ................................................................................................ 129
8.6.5 Frequency ......................................................................................................... 129
8.6.6 Measurement accuracy ..................................................................................... 129
8.6.7 Accuracy of C and D ........................................................................................ 129
8.6.8 Accuracy of L ................................................................................................... 130
8.6.9 Accuracy of Z ................................................................................................... 130
8.6.10 Accuracy of DCR ............................................................................................. 130
Chapter 9 Command Reference ................................................................................................ 132
9.1 GPIB Common Commands ...................................................................................... 132
9.2 SCPI Command ........................................................................................................ 133
9.2.1 DISPlay subsystem commands ........................................................................ 135
9.2.2 FREQuency subsystem commands .................................................................. 136
9.2.3 VOLTage subsystem commands ...................................................................... 136
9.2.4 CURRent subsystem commands ...................................................................... 137
9.2.5 AMPLitude subsystem commands ................................................................... 137
9.2.6 OUTPut subsystem commands ........................................................................ 138
9.2.7 BIAS subsystem commands ............................................................................. 138
9.2.8 TRIGger subsystem commands ....................................................................... 140
9.2.9 AMPLitude Auto Level subsystem commands ................................................ 141
9.2.10 Output RESister Internal Resistance subsystem commands ............................ 141
9.2.11 FUNCtion subsystem commands ..................................................................... 141
9.2.12 COMParator subsystem commands ................................................................. 145
9.2.13 LIST subsystem commands ............................................................................. 148

VIII
9.2.14 TRACE subsystem commands ......................................................................... 154
9.2.15 Handler subsystem commands ......................................................................... 157
9.2.16 FETCh? subsystem commands ........................................................................ 158
9.2.17 CORRection subsystem commands ................................................................. 160
9.2.18 Mass MEMory subsystem commands .............................................................. 165
9.2.19 TRAN subsystem commands ........................................................................... 167
9.2.20 SYSTem system subsystem commands ........................................................... 172
9.3 Modbus commands .................................................................................................. 177
9.3.1 Command format ............................................................................................. 177
9.3.2 CRC16 calculation method - look-up table method ......................................... 179
9.3.3 Command function comparison table............................................................... 180
Chapter 10 Description for Handler ............................................................................................ 187
10.1 Bin Sorting Handler Description ...................................................................................... 187
10.1.1 Technology Description ................................................................................... 187
10.1.2 Electrical feature .............................................................................................. 191
10.1.3 Handler Wiring Operation Instructions of BIN Sorting ................................... 194
10.1.4 Using Operations .............................................................................................. 196
10.2 List Sweep Handler Description .............................................................................. 197
10.2.1 List Sweep Sorting Logic ................................................................................. 197
10.2.2 Technical Description ....................................................................................... 197
10.2.3 Electrical Feature ............................................................................................. 201
10.2.4 List sweep sorting wiring operation instructions.............................................. 201
10.2.5 Using operation ................................................................................................ 201
10.3 HANDLER description of transformer single group test ......................................... 202
10.3.1 Sorting logic ..................................................................................................... 202
10.3.2 Technical description........................................................................................ 202
10.3.3 Electrical Feature ............................................................................................. 204
10.3.4 Handler wiring operation instructions for transformer single measurement .... 205
10.3.5 Using Operation ............................................................................................... 205
10.4 Transformer scan HANDLER description ............................................................... 206
10.4.1 Technical Description ....................................................................................... 206
10.4.2 Electrical Feature ............................................................................................. 208
10.4.3 Handler wiring operation instructions for transformer Scan ............................ 212
10.4.4 Using operation ................................................................................................ 216
10.5 Instructions for HANDLER sorting of scanning fixtures......................................... 216

IX
Announcement
The description of the manual may not cover all contents of the instrument, and our company is
subject to change and to improve the performance, function, inner structure, appearance, accessory
and package of the instrument without notice. If there is puzzle caused by inconsistency of manual
and instrument, then you can contact with our company by the address on the cover.

1
Chapter 1 Out of Box Audit
When you receive the instrument, some inspections are necessary, and the condition must be
understood and available before installing the instrument.
1.1 To Inspect the package
Inspect the shipping container for damage after unpacking it. It is not recommended to power on the
instrument in the case of a damaged container.
If the contents in the container do not conform to the packing list, notify us or your dealer.
1.2 Power connection
1) Power-supplying voltage range: 100~120Vac or 198~242Vac. Being related with the power
setup on the rear panel.
2) Power-supplying frequency range: 47~63Hz.
3) Power-supplying power range: not less than 130VA.
4) Power supplying input phase line L, zero line N, ground lead E should be as same as the power
plug of the instrument.
5) After careful design, the instrument can reduce the clutter jamming caused by AC power
terminal input, however, it should be used under the environment with low-noise. Please install
power filter if being unavoidable.
———————————————————————————————————————
Warning: In order to prevent user and instrument from being hurt by leakage, it is necessary
for user to guarantee the ground line of supply power being reliably grounded.
———————————————————————————————————————
1.3 Fuse
The instrument has installed fuse, so operators should use the installed fuse of our company.
———————————————————————————————————————
Warning: Be sure that the location of fuse is consistent with power-supplying voltage range
before charging.
———————————————————————————————————————
1.4 Environment
1) Please do not operate the instrument in the place that is vibrative, dusty, under direct sunlight

2
or where there is corrosive air.
2) The normal working temperature is 0℃～40℃, relative humidity ≤75%, so the instrument
should be used under above condition to guarantee the accuracy.
3) There is heat abstractor on the rear panel to avoid the inner temperature rising. In order to keep
good airiness, please don’t obstruct the left and right airiness holes to make the instrument
maintain the accuracy.
4) Although the instrument has been specially designed for reducing the noise caused by ac power,
a place with low noise is still recommended. If this cannot be arranged, please make sure to use
power filter for the instrument.
5) Please store the instrument in the place where temperature is between 5℃ and 40℃, humidity
is less than 85%RH. If the instrument will not be put in use for a time, please have it properly
packed with its original box or a similar box for storing.
6) The instrument, especially the test cable should be far from strong electro-magnetic field, to
avoid the jamming on measurement.
1.5 Use of Test Fixture
Please use the accessory test fixture or cable, the test fixture made by user or from other
company may cause the incorrect measurement result. The test fixture or cable should be kept
clean, as well as the pin of DUT, thus to guarantee the good connection between DUT and fixture.
Connect the fixture or cable to four test terminals Hcur, Hpot, Lcur, Lpot on the front panel. As for
the DUT with shielding shell, connect shielding layer or ground “┴”.
Note: When test fixture or cable has not being installed, the instrument will display an unstable test
result.
1.6 Warm-up
1) To guarantee the accurate measurement, the warm-up time is no less than 30 minutes.
2) Please not turn on or off instrument frequently, in order to avoid the inner data fluster.
1.7 Other features
Power: consumption power≤130VA.
Dimensions (W*H*D):
TH2840A, TH2840B, TH2840AX, TH2840BX: 430mm*177mm*265mm;
TH2840NX: 430mm*177mm*405mm
Weight: TH2840A, TH2840B, TH2840AX, TH2840BX about 11kg;
TH2840NX is about 17 kg.

4
Chapter 2 Introduction
In this chapter, the basic operation features of TH2840 series are described. Please read the content
carefully before using TH2840X series instruments.
2.1 Introduction to front panel
Figure 2-1 shows the front panel of TH2840 Series.
PrtScn
Help
Preset
0+
7 8 9
456
1 2 3
PASS
FAIL
M/p
k/n
Reset
Trigger
Display Setup System
Esc
File
Enter
Cal
OK
/
. -
/
,
~
m
μ
Home
~
~
LCUR LPOT HPOT HCUR
！
POWER
±42 MaxVdc
(-) (+)
Turns
TH2840NX Automatic Transformer Test System -Hz20 Hz
500k
1 2 3 4 5 6 7 8 9 10
21
11 12 13 14 15 16 17 18 19 20
22232425262728
Figure 2-1 Front panel
1) USB HOST interface
TH2840 is equipped with two USB HOST interfaces, which are used to connect U disk storage
for file saving and recall, and it can also connect to devices such as mouse, keyboard, and
scanner. Note that only one U disk storage can be inserted at the same time.
2) [Preset] key
Reset button, press [Preset] to restore the instrument to the factory default settings.
3) [Help] key
Help key. Press the [Help] key, the [Help] key will be lit, and the display will pop up the
function meaning and operation instructions where the cursor is located. Press the [Help]
button again, the [Help] button will go out, and the operation instruction window will
disappear.
4) [PrtScn] key
Screenshot button, save the picture of the current interface to the USB storage.
5) Brand and model
Brand and model
6) LCD liquid crystal display
1280x800 color LCD capacitive touch screen, showing the measurement results and
conditions.

5
7) [Display] menu
Press the [Display] key to enter the corresponding test display page of the meter function
(bridge, transformer measurement, transformer scan, focus scan).
8) [SETUP] menu
Press the [Setup] key to enter the corresponding test setting page of the meter function (bridge,
transformer measurement, transformer scan).
9) Knob with confirmation function
Move the cursor, select and set parameters. The confirm button function in the middle is used
to terminate data input, confirm and save the data input by the knob.
10) Cursor keys and OK key
The cursor keys are composed of up (↑), down (↓), left (←) and right (→), which are used to
move the cursor between the fields on the LCD display page. When the cursor moves to a
certain field, the field will be highlighted on the LCD screen. The middle of the cursor keys is
the OK key, and its function is similar to the [Enter] key.
11) [SYSTEM]
Press this key to enter into the system setup page.
12) [ESC] key
ESCAPE key.
13) Numeric key
The numeric keys are used to input data to the instrument. The numeric keys are composed of
numeric keys [0] to [9], decimal point [./,] and [+/-] keys.
14) [←] key
Backspace key. Press this key to delete the last digit of the entered value.
15) [～] key
This button is only used in transformer scan, and is used for continuous input of pins.
16) Magnitude key
The magnitude key is used to input the magnitude of the corresponding parameter.
17) PASS indicator
LED indicator shows the test result has passed.
18) FAIL indicator
LED indicator shows the test result has failed.
19) [Reset] key
Press the [Reset] key to pause the scan in the list scan and trace scan of the bridge, and press
the [Trigger] key again to continue the scan from the previous pause. In the automatic
transformer scan, press the [Reset] key to stop the scan and the next trigger will start from the
beginning.
20) [Trigger] key
When the trigger mode is set to Single mode, press this key to trigger the instrument.
21) Test terminals (UNKNOWN)
4-teminal test pair are used to connect 4-terminal test fixture or cable to measure DUT.
The 4 terminals are respectively as follows: Hcur, Hpot, Lpot and Lcur.
Transformer secondary test terminal (TURNS)
(+): Secondary (+) terminal
(-): Secondary (-) terminal

6
NOTE: TH2840A and TH2840B have no transformer secondary measuring terminal.
22) [File] key
This key is used to enter into FILE MANAGE interface quickly.
23) [Enter] key
[Enter] key is used to terminate data input, confirm and save the data displayed in the input
line.
24) [Cal] key
User calibration execution shortcut keys.
25) [Home] key
The [Home] key is used to switch between different functions such as electric bridge,
transformer single-group test, and transformer scan.
26) POWER
Power switch. The instrument is red in the standby state and green in the power-on state. To
shut down, you need to press and hold the power switch.
27) [DC Bias] key
[DC Bias] key is used to allow or prohibit the output of 0-100mA, ±40V, 0-2A DC bias source.
Press the [DC Bias] key, the [DC Bias] key will be lit, indicating that the DC bias output is
allowed; press the [DC Bias] key again, the [DC Bias] key will go out, indicating that the DC
bias output is prohibited. In some non-test screens where DC Bias cannot be added, pressing
this button will have no response.
28) [LOCK] key
Press the [LOCK] key, the [LOCK] key will be lit, indicating that the key functions of the
current panel are locked; press the [LOCK] key again, the [LOCK] key will be off, indicating
that the keyboard lock state is released. If the password function is set to "ON", the correct
password must be entered when unlocking the keyboard, otherwise the keyboard lock cannot
be unlocked.
When the instrument is controlled by RS232, USB_Device, Lan port, etc., the [LOCK] button
will be lit. Press the [LOCK] key again, the [LOCK] key will go out, indicating that it returns
to the local unlocked state of the keyboard.
2.2 Introduction to rear panel
The rear panels of different models of TH2840 series are different. The detailed description of the
rear panel layout of TH2840A, TH2840B, TH2840AX, TH2840BX will be introduced in 2.2.1 and
the detailed description of the rear panel layout of TH2840NX will be introduced in 2.2.2.
2.2.1 Rear panel description 1
Figure 2-2 briefly describes the rear panel of TH2840A, TH2840B, TH2840AX, and TH2840BX.

7
RS-232C LCR Handler Trans Controller Trigger Trans Handler Device Trans Scanner LAN
3 245678910
1
1112
Rating Fuse
110V/60Hz 100VA
220V/50Hz 100VA T2AL 250V
~
~
T4AL 250V
Disconnect input power before replacing fuse
for continued fire protection,
use manual specified type rating fuse only.
WARNING:
※
※
This instrument contains no operator
serviceable parts inside;
refer servicing to service trained personnel only.
！
Figure 2-2 Rear panel
1) Nameplate
Indicate production date, instrument number, manufacturer and other information.
2) Fuse base
Being used to install power fuse, protect instrument, and switch 110V/220V by changing the
direction of core.
3) Power socket
Input AC power.
Warning: Before powering on, pay attention to whether your fuse position is consistent
with the supply voltage range.
4) TransScanner interface
To control the transformer scanning box through the Trans Scanner interface. It is compatible
with TH1901 and TH1831 scanning boxes, but different scanning boxes require different
connection cables.
Tip: TH2840A and TH2840B have no transformer scan function, so this interface cannot be
used.
5) Ground terminal
This terminal is connected to the chassis of the instrument. It can be used to protect or shield
ground connections.
6) LAN interface
LAN interface is used to realize the control and the communication of network system.
7) USB Device interface
The tester can communicate with PC through the USB Device interface.
8) Trans Handler interface
The Handler interface of the transformer scan to realize the sorting output of the transformer
scan results.
9) TRIGGER interface
External trigger devices such as foot control can be connected.
10) Trans Controller interface

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The Handler extension interface of transformer scanning. When the number of sorting signals
of the transformer scanning Handler interface is insufficient, this interface can be used to
expand the sorting signal and realize the sorting output of the transformer scanning result.
11) LCR HANDLER interface
The Handler interface can realize the sorting output of the test results. This interface is used for
the sorting of the single-group test of the bridge and the transformer.
12) RS232C serial interface
The serial communication interface can realize the online communication with the computer.
2.2.2 Rear panel description 2
Figure 2-3 briefly describes the rear panel of TH2840NX.
!
To avoid electric shock,
the power cord protective grounding conductor must be
connected to ground.
Disconnect power supply before replacing fuse.
Warning:
Rating Fuse
110V/60Hz 100VA
220V/50Hz 100VA T2AL 250V
~
~
T4AL 250V
RS-232C LCR Handler Trans Controller Trigger Trans Handler Device Trans Scanner LAN
3 2456789
10
1
111213
Figure 2-3 Rear panel
1) Nameplate
Indicate production date, instrument number, manufacturer and other information.
2) Fuse base
Being used to install power fuse, protect instrument, and switch 110V/220V by changing the
direction of core.
3) Power socket
Input AC power.
Warning: Before powering on, pay attention to whether your fuse position is consistent
with the supply voltage range.
4) TransScanner interface
To control the transformer scanning box through the Trans Scanner interface. It is compatible
with TH1901 and TH1831 scanning boxes, but different scanning boxes require different
connection cables.
5) Ground terminal
This terminal is connected to the chassis of the instrument. It can be used to protect or shield
ground connections.

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6) LAN interface
LAN interface is used to realize the control and the communication of network system.
7) USB Device interface
The tester can communicate with PC through the USB Device interface.
8) Trans Handler interface
The Handler interface of the transformer scan to realize the sorting output of the transformer
scan results.
9) TRIGGER interface
External trigger devices such as foot control can be connected.
10) Trans Controller interface
The Handler extension interface of transformer scanning. When the number of sorting signals
of the transformer scanning Handler interface is insufficient, this interface can be used to
expand the sorting signal and realize the sorting output of the transformer scanning result.
11) LCR HANDLER interface
The Handler interface can realize the sorting output of the test results. This interface is used for
the sorting of the single-group test of the bridge and the transformer.
12) Scanning cable interface
Scanning cable interface uses FRC-50P horn socket.
13) RS232C serial interface
The serial communication interface can realize the online communication with the computer.
2.3 Introduction to display zone
TH2840 uses a 10.1-inch capacitive touch screen, and the content displayed on the screen is divided
into the following display areas, as shown in Figure 2-4.

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The element composition of this page includes: title area, test condition area, 4 parameter result
display area, sorting result display area, menu area, title area, status bar.
2.4 Main menu keys and corresponding displayed pages
2.4.1 [DISP]
When the LCR function is used, press this key to enter into the LCR measurement display page.
The function pages of this part are (use the "touch screen" to select the following page
functions, the same below):
<Meas Display>
<List Display>
<Trace Display >
<Save>
When the transformer test function is used, press this key to enter into the transformer test
display page. The function pages of this part are:
<Save>
When the transformer scan function is used, press this key to enter into the transformer scan
display page. The function pages of this part are:
<Pri.>
<Load Std>
<Deviation>
<Speed>
<Test Fail>
<Focus>
<Split>
<Save>
2.4.2 [SETUP]
When the bridge function is used, it is used to enter the setting screen of the component test.
The function pages of this part are:
<Meas Setup>
<Limit Setup>
<List Setup>
<Trace Setup>
<User Corr>
<Handler>
When the transformer test function is used, it is used to enter each setting screen of the
transformer test. The function pages of this part are:
<Single Setup>
<User Corr>

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<Handler>
When the transformer scan function is used, it is used to enter each setting screen of the
transformer scan. The function pages of this part are:
<Trans ID>
<Pin To Fixture>
<Pin Setup>
<Condition>
<Copy>
<Handler Mode>
<Stat>
<Tools>
2.4.3 [SYSTEM]
It is used to enter the system settings homepage. It is mainly about communication settings,
user management settings, Handlers settings. The function pages of this part are:
<System Info>
<Message>
<System check>
2.5 Basic Operation
The basic operation is as follows:
Use menu keys ([DISP], SETUP], [SYSTEM]) and soft keys to select the desired page.
Use the cursor keys ([←][→][↑][↓]), knob or directly touch the screen to move the cursor to
the area you want to set. When the cursor moves to a certain area, the area will be highlighted.
This area is the area where the cursor can be set.
The corresponding soft key function of the domain where the current cursor is located will be
displayed in the "soft key area". Select and press the desired soft key. Numeric keys, [←],
magnitude keys and [Enter] keys are used for data input. When a number key is pressed, you
can press the order key or the [Enter] key to end the data input.
2.6 Power on and off
Plug in 3-line power plug.
Caution: Keep the power-supply voltage and frequency conform to above specifications. Power
input phase line L, zero line N, ground line E should be the same as that of the instrument.
TH2840 series instruments use soft switches. After plugging in the three-wire power supply, some
indicators on the front panel will flash for a few seconds. After a few seconds, the power button will
light up in red, and other buttons with LED indications will go out.
Power on: Press the power switch at the lower left corner of the front panel to turn on the
instrument and display the startup screen. After the instrument is started, the power button lights up
green. The power button of TH2840 series instrument has memory function.

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Shutdown: After using the instrument, if you need to turn off the instrument, press and hold the
power button at the lower left corner of the front panel to turn off the instrument. After turning off
the instrument, the power button lights up in red, and the instrument is in the standby state. If you do
not use the instrument for a long time, please disconnect the power cord and store the instrument in
the environment required by 1.4.
Note: The factory password is set for this series of products. The factory password is 2840. The user
can reset the password according to his needs during the use. For details, please refer to the
password item on the <System Setup> page.