Tonghui TH9310 Series User manual

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TH9310/20 Series
AC/DC Withstanding Voltage/ Insulation
Resistance Tester
Operation Manual
Tonghui Electronic Co.,Ltd.
www.tonghui.com.cn

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Manual Printing History
The manual printing data and part number indicate its current edition. The printing date
changes when a new edition is printed. The manual part number changes when extensive
technical changes are incorporated.
TH9310/20 Series Operation Manual Ver1.6.………………..……………….2018.7

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Content
Chapter 1 Setup ..................................................................................................................................................6
1.1 Precautions for Use.....................................................................................................................................6
1.2 Precautions for Moving...............................................................................................................................7
1.3 Connecting the AC Power Cord .................................................................................................................7
1.4 Grounding...................................................................................................................................................7
1.5 Checking Operations...................................................................................................................................7
1.6 Other Specifications....................................................................................................................................8
Chapter 2 Precautions on Handling..................................................................................................................9
2.1 Prohibited Operations.................................................................................................................................9
2.2 Action When in Emergency........................................................................................................................9
2.3 Precautions on Testing..............................................................................................................................10
2.4 Warning for Residual High Voltages........................................................................................................10
2.5 Dangerous States of Failed Tester ............................................................................................................11
2.6 To Ensure Long-Term Use without Failures ............................................................................................12
2.7 Daily Checking.........................................................................................................................................12
3.1 Front Panel................................................................................................................................................13
3.1.1 POWER .............................................................................................................................................13
3.1.2 START and STOP..............................................................................................................................13
3.1.3 Band and Model.................................................................................................................................13
3.1.4 USB Interface ....................................................................................................................................13
3.1.5 Indicator.............................................................................................................................................13
3.1.6 FUNCTION.......................................................................................................................................14
3.1.7 HV......................................................................................................................................................14
3.1.8 Output voltage HIGH terminal (HV).................................................................................................14
3.1.9 Test low terminal, test current return terminal (LOW/RET)..............................................................14
3.1.10 Move key .........................................................................................................................................14
3.1.11 Shortcut key.....................................................................................................................................14
3.1.12 COPY key........................................................................................................................................14
3.1.13 LCD screen......................................................................................................................................14
3.2 Instruction of rear panel............................................................................................................................14
3.2.1 Fan .....................................................................................................................................................15
3.2.2 Test low terminal, test current return terminal (optional) ..................................................................15
3.2.3 High voltage output terminal (optional).............................................................................................15
3.2.4 Power jack: with fuse holder, switchable line voltage mode .............................................................15
3.2.5 Protective earth terminal....................................................................................................................15
3.2.6 Mark...................................................................................................................................................15
3.2.7 RS232C serial interface .....................................................................................................................16
3.2.8 USB serial communication interface .................................................................................................16
3.2.9 HANDLER interface .........................................................................................................................16
3.2.10 SIGNAL interface............................................................................................................................16
3.3 Multichannel module declaration .............................................................................................................16
3.4 Description................................................................................................................................................17

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Chapter 4 Basic operation................................................................................................................................22
4.1 Interface structure overview .....................................................................................................................22
4.2 Instruction of panel function interface and parameter ..............................................................................23
4.2.1 SETUP...............................................................................................................................................24
4.2.2 TEST (Take AC for example) ............................................................................................................25
4.2.3 SYSTEM............................................................................................................................................25
4.2.4 FILE...................................................................................................................................................27
4.3 Test item interface and parameter setup ...................................................................................................29
4.3.1AC withstanding voltage test parameter setup：...............................................................................29
4.3.2 DC withstanding voltage test parameter setup :.................................................................................30
4.3.4 Open and short detection (OS) parameter setup：............................................................................31
4.3.5 MF (multi-channel follow) ................................................................................................................32
4.3.6 CK (multi-channel contact check) .....................................................................................................33
4.4 Test function theory and instruction.........................................................................................................34
4.4.1 Start up test ........................................................................................................................................35
4.4.2 Test delay...........................................................................................................................................35
4.4.3 Test voltage rise .................................................................................................................................35
4.4.4 DC RAMP..........................................................................................................................................35
4.4.5 High-voltage test................................................................................................................................35
4.4.6 Voltage fall.........................................................................................................................................35
4.4.7 Ground wire current detection function.............................................................................................35
4.4.8 Current over limit and arc detection (ARC) function ........................................................................36
4.4.9 Fail judgment.....................................................................................................................................37
4.4.10 Deal with test results........................................................................................................................37
4.4.11 STOP................................................................................................................................................37
4.4.12 OFFSET...........................................................................................................................................37
4.5 SCAN multi-channel structure and use.....................................................................................................38
4.5.1 SCAN parameter................................................................................................................................38
4.5.2 Structure principle..............................................................................................................................38
4.6 Structure and Use of HANDLER and SIGNAL Interface Circuit............................................................39
4.6.1 Control interface theory.....................................................................................................................39
4.6.2 Control interface instruction ..............................................................................................................40
4.7 Other interface and function .....................................................................................................................41
Chapter 5 Serial port commands instruction.................................................................................................42
5.1 SCPI commands........................................................................................................................................42
5.2 DISPlay Subsystem Commands ...............................................................................................................42
5.3 FUNCtion Subsystem Commands............................................................................................................43
5.3.1 FUNCtion subsystem commands--mainly used to set the test parameters of test function ...............43
5.3.2 Commands for PROG Function.........................................................................................................43
5.3.3 Commands for AC Setup Function....................................................................................................44
5.3.4 Commands for DC Setup Function....................................................................................................47
5.3.5 Commands for IR Setup Function .....................................................................................................49
5.3.6 Commands for OS Setup Function ....................................................................................................51
5.4 SYSTem Subsystem Commands ..............................................................................................................52

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5.5 MMEM Subsystem Commands................................................................................................................57
5.6 FETCH Subsystem Commands ................................................................................................................57
5.7 Other Commands......................................................................................................................................58
5.8 Command debugging sequence................................................................................................................58

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Chapter 1 Setup
This chapter describes the procedures from unpacking to installation to operation checking.
1.1 Precautions for Use
Be sure to observe the following precautions when using the tester.
Do not use the tester in a flammable atmosphere.
To prevent explosion or fire, do not use the tester near alcohol, thinner, or other combustible materials, or
in an atmosphere containing such vapors.
Avoid locations where the tester is exposed to high temperatures or direct sunlight.
Do not locate the tester near a heater or in areas subject to drastic temperature changes.
Operating temperature range: 5 °C to +35 °C
Storage temperature range: -20 °C to +60 °C
Avoid humid environments.
Do not locate the tester in a high-humidity environment—near a boiler, humidifier or water supply.
Operating humidity range: 20% to 80% RH (no dew condensation permitted)
Storage humidity range: 90%RH or less (no dew condensation permitted)
Condensation may occur even within the operating humidity range. In that case, do not start using the
tester until the location is completely dry.
Do not place the tester in a corrosive atmosphere.
Do not install the tester in a corrosive atmosphere or one containing sulfuric acid mist or the like. This may
cause corrosion of various conductors and imperfect contact with connectors, leading to malfunction and
failure, or in the worst case, a fire.
Do not locate the tester in a dusty environment.
Dirt and dust in the tester may cause electrical shock or fire.
Do not use the tester where ventilation is poor.
This tester features a forced-air cooling system. Provide sufficient space for the air inlet on the lateral side
and the air outlet on the rear side to allow air to flow.
Do not place the tester on a tilted surface or in a location subject to vibrations.
If placed on a non-level surface or in a location subject to vibration, the tester may fall, resulting in damage
and injury.
Do not use the tester in locations affected by strong magnetic or electric fields.
Operation in a location subject to magnetic or electric fields may cause the tester to malfunction, resulting
in electrical shock or fire.
Do not use the tester in locations near a sensitive measuring instrument or receiver.
Operation in a location subject, may cause such equipment may be affected by noise generated by the
tester.
At a test voltage exceeding 3 kV, corona discharge may be generated to produce substantial amounts of RF
broadband emissions between grips on the test leadwire. To minimize this effect, secure a sufficient
distance between alligator clips. In addition, keep the alligator clips and test leadwire away from the
surfaces of conductors (particularly sharp metal ends).

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1.2 Precautions for Moving
When moving the tester to the installation site or otherwise transporting it, take the following precautions:
Before moving the tester, turn off the power switch.
Transporting the tester with its POWER switch on can lead to electric shock and damage.
When moving the tester, Disconnect all wires from it.
Moving the tester without disconnecting the cables may result in breakage of the wire or injury due to the
tester tipping over.
1.3 Connecting the AC Power Cord
The power cord that is provided varies depending on the destination for the product at the factory-shipment.
Do not use AC power cords that are not standard with this instrument.
Connection procedure:
1. Confirm that the supply voltage is within the line voltage range of the tester.
2. Confirm the nominal value of the fuse and the line power are correctly selcected.
3. Confirm that the POWER switch on the tester is off.
4. Connect the AC power cord to the AC LINE connector on the rear panel.
5. Use the provided power code or power code that is selected by qualified personnel.
6. Plug in the AC power cord.
1.4 Grounding
！
WARNING: Be sure to connect the tester to an electrical ground (safety ground). If the output to a
conveyer or peripheral device that is connected to an earth ground or a nearby commercial power line is
short-circuited without grounding, the tester chassis is charged to an excessively high voltage, resulting in
extreme danger.
This tester is designed as a ClassⅡequipment (equipment protected against electric shock with protective
grounding in addition to basic insulation). Therefore, electric shock may occur without proper grounding.
To ensure safety, be sure to ground the tester.
Choose either of the following two available methods of doing so:
1. Connect the AC power cord to a three-contact grounded electrical outlet.
2. Connect the protective conductor terminal on the rear panel to the earth ground.
Have specialized engineers select, manufacture, and install cables.
To ensure secure connection, use proper tools.
1.5 Checking Operations
！
WARNING: Use the interlock jumper only to quickly cancel the protection status.
When using this tester in a cramped working space, make a box-like structure for the DUT; when testing a
complicated large-scale DUT, provide a cover or other means for the DUT to prevent electric shock by
cutting off the output when the cover is opened. It is also recommended that an enclosure be provided
around the operating area and that output be cut off every time the door is opened.
Before turning on the power, confirm that the allowable voltage range indicated on the power supply is the
Earth
ground

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same as that indicated on the rear panel of the tester.
When the power is turned on, the tester lights all LEDs on the front panel and self-diagnosis is started.
Before starting up the tester, confirm that all LEDs are on to ensure safety.
It is particularly dangerous to start a test when the DANGER lamp is broken.
Note that, in self-diagnosis, even when the DANGER lamp is lighting, no output or voltage is being
generated.
！
CAUTION: After turning off the POWER switch, wait several seconds before turning it on. Turning the
POWER switch on/off repeatedly with insufficient intervals may damage the tester.
Checking procedure:
1. Confirm that the allowable voltage range indicated on the power supply is the same as the input voltage
range set by the fuse holder.
2. Confirm that the AC power cord is properly connected to the AC LINE connector on the rear panel.
3. Plug in the AC power cord.
4. Turn on the POWER switch. Confirm that all LEDs on the front panel are lit. Following the opening
screen, display the ACW screen.
5. Following the opening screen, display the ACW screen and confirm that the tester is kept in the READY
status.
6. Turn on the POWER switch again.
1.6 Other Specifications
1. Power: ≤500VA (TH9320)
≤400VA (TH9310)
2. Dimensions(W*H*D): 280mm*88mm*420mm;
3. Weight: approx. 15kg (TH9320); approx. 13kg (TH9310).
4. Multi-channel module: 280mm*50mm*420mm; approx.5kg
Input
voltage
Frequency
range
Fuse
Model
Rated power
110V
47-63Hz
5A
TH9320
400VA
TH9310
300VA
220V
3A
TH9320
400VA
TH9310
300VA

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Chapter 2 Precautions on Handling
This chapter describes the precautions to be followed in the handling of this tester. When using the tester,
take utmost care to ensure safety.
！
WARNING :The tester derivers a 5 kV test voltage which can cause human injury or death.
When operating the tester, be extremely careful and observe the cautions, warnings, and other
instructions given in this chapter.
2.1 Prohibited Operations
Do not turn on/off the power repeatedly
After turning OFF the power switch, be sure to allow several seconds or more before turning it ON again.
Do not repeat turning ON/OFF the power switch rapidly. If you do this, the protectors of the tester may not
be able to render their protective functions properly. Do not turn OFF the power switch when the tester is
delivering its test voltage–you may do this only in case of emergency.
Do not short the output to the earth ground
Pay attention so that the high test voltage line is not shorted to a nearby AC line or nearby devices (such as
conveyors) which are connected to an earth ground. If it is shorted, the tester chassis can be charged up to
the hazardous high voltage. Be sure to connect the protective grounding terminal of the tester to an earth
line. If this has been securely done, even when the HIGH VOLTAGE terminal is shorted to the LOW
terminal, the tester will not be damaged and its chassis will not be charged up to the high voltage.
Be sure to use a dedicated tool when grounding the protective grounding terminal.
！
CAUTION: The term "AC line" here means the line on which the tester is operating. That is the line to
whose outlet the AC power cable of the tester is connected. It may be of a commercial AC power line or of
a private-generator AC power line.
Do not apply an External Voltage
Do not apply a voltage from any external device to the output terminals of the tester. The analog voltmeter
on the front panel cannot be used as stand-alone voltmeter. They may be damaged if their output terminals
are subject to an external voltage.
2.2 Action When in Emergency
In case of an emergency (such as electric shock hazard or burning of DUT), take the following actions.

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You may do either (a) or (b) first. But be sure to do both.
1. Turn OFF the power switch of the tester.
2. Disconnect the AC power cord of the tester from the AC line receptacle.
2.3 Precautions on Testing
Wearing Insulation Gloves
When handling the tester, be sure to wear insulation gloves in order to protect yourself against high
voltages. It is forbidden to touch the live conductor by hand during high voltage test even with high
voltage insulation gloves.
Precautions for Pausing Tests
When you need to touch the test conductor or change the test connection, press the STOP switch first to
ensure that the instrument exits the test preparation state. If you are not going to resume the test soon or if
you are leaving the Test area, be sure to turn-OFF the POWER switch.
Items Charged Up to Dangerous High Voltages
When in test, the HV output, HV test leads, HV probes, DUT and output terminals and their vicinities
can be charged up to dangerous high voltages. Never touch them when in test.
！
WARNING：The vinyl sheaths of the alligator clips of the test leadwires which are supplied
accompanying the tester have no sufficient insulation for the high test voltages. Never touch them when in
test.
Matters to be Sure of After Turning-OFF Power
If you have to touch the DUT, test leadwires, probes, and/or output terminals and their vicinities for
re-connections or other reasons, be sure of the following two matters.
1. To confirm that the working condition is not in test mode.
2. The DANGER lamp has gone out.
Warnings for Remote Control
Be extremely careful when operating the tester in the remote control mode in which the dangerous high
test voltage is ON/OFF-controlled remotely. The operator cannot know the real working condition of the
instrument through the interface. Please pay special attention to check the reliable connection of the
remote control:
1. The “STOP” switch must be connected reliably. Press the “STOP” switch before changing the DUT.
2. When testing in a working environment with a lot of people, remote control switch has the
“INTLOCK”switch and HV lamp. Disconnect the “INTLOCK” switch before changing the DUT.
Provide means to assure that none can touch the DUT, test leadwires, probes, output terminals and their
vicinities when the test voltage is being delivered.
2.4 Warning for Residual High Voltages
！
WARNING: In DC withstanding voltage testing and insulation resistance testing, the test lead wire, test

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probe, and DUT are charged to a high voltage. The tester is equipped with a discharge circuit, but some
time is nonetheless required to discharge them after the output is cut off. There is a danger of electric shock
during discharge. To avoid electric shock, take the utmost care to ensure that the DUT, test lead wire,
probe, and highly charged parts around the output terminal are not touched. If it is necessary to touch them,
be sure to confirm the DANGER lamp has gone out.
As soon as the output is cut off, the tester’s discharge circuit starts forced discharging. Do not disconnect
the DUT during a test or prior to completion of discharging.
Under normal circumstances, it can be guaranteed that the test loop voltage is within the safe voltage range
when finishing discharging. When the capacitance of the DUT is too large or the structure of the DUT is
special, it may leads to incomplete discharge. In order to ensure complete discharge, test method must be
changed by technical personnel.
Discharge time:
Computational formula of discharge time: t = -ln（30 / U）×R×C
t: discharge time
30: discharge residue safty voltage 30V
U: test set voltage
R: discharge impedance of the DUT, the discharge impedance of the instrument is approx. 10k
C: capacitance of the DUT
In general, only DC high voltage test needs discharge and the length of the discharge time varies according
to the properties of the DUT.
If the test terminated normally, the voltage will drop to zero according to the voltage fall time. If the test
failed, discharge of the DUT is conducted by the transformer secondary winding (resistance of
approximately 10k). Approximately 0.05s are required for 1uF capacitor with high voltage of 6000V to
discharge to 30V. The fixed discharge time of the instrument is 0.2s, which ensures complete discharge of
the device.
2.5 Dangerous States of Failed Tester
Typical possible dangerous states of the tester are as shown below and in which cases the most dangerous
situation that “the high test voltage remains delivered and the instrument get out of control” may
occur. When this situation has occurred,
1. Immediately turn OFF the power switch and disconnect the AC power cable from the AC line
receptacle.
2. Immediately keep far away from the instrument and confirm no risk of the test circuit by the technical
personnel; or keep the instrument still for more than one hour and confirm no output voltage in the test
terminal.
3. Remove the relevant connecting lines and send the instrument back to us for maintenance.
！
WARNING: Keep away from the instrument after turning off the power and prevent other people from
approaching. Do not immediately disassemble the test circuit. Immediately call our distributor or agent.
High voltage may remain in the interior of the instrument. It is hazardous for an unqualified person to
attempt to troubleshoot any tester problem.

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2.6 To Ensure Long-Term Use without Failures
The withstanding voltage-generating block of the tester is designed to release half the rated amount of heat,
in consideration of the size, weight, cost, and other factors of the tester. The tester must therefore be used
within the ranges specified below. If you deviate from these ranges, the output block may be heated to
excess, activating the internal protection circuit. Should this happen, wait until the temperature returns to
the normal level.
Output requirements for withstanding voltage testing
Ambient
temperature
Upper current
Pause Time
Output time
T≤40℃
AC
>12mA (TH9320)
>6mA (TH9310)
At least as long as the
output time
Maximum of 1
minute
<8mA (TH9320)
<4m (TH9310)
Not necessary
Continuous output
possible
DC
>6mA (TH9320)
>3mA (TH9310)
At least as long as the
output time
Maximum of 1
minute
<4mA (TH9320)
<2mA (TH9310)
At least as long as the
charging wait time
(WAIT TIME)
Continuous output
possible
Note: Test time <= Output time <= voltage rise time + test time + voltage fall time
The use of the instrument must be suspended while the fan is working continuously for more than
thirty minutes, otherwise the amplifier output module may be burned due to overheating.
2.7 Daily Checking
To avoid accidents, confirm at least the following before starting operation:
1. The input source complies with the standard and the tester power configuration is correct.
2. The tester is connected to an earth ground.
3. The coating of the high-voltage test lead wire is free from cracks, fissures, and breakage.
4. Without connecting the test lines, the instrument can finish the test successfully when starting test by
default.
5. The tester generates FAIL signal when the ends of the low-voltage test lead wire and high-voltage test
lead wire are short-circuited.

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Chapter 3 Part names and Functions
This chapter describes the names and functions of components such as switches, displays, and connectors
on the front and rear panels.
3.1 Front Panel
Figure 3-1 gives a brief description of the front panel for TH9310/20 series.
HV
RTN/LOW
OUTPUT
!
HIGH VOLT
MAX 5kV AC
START
STOP
POWER
FAIL PASS
SETUP
SYSTEM FILE
COPY
TEST
1
2
13 12 11 10
8
7
6
9
543
Figure 3-1
3.1.1 POWER
Power switch---Operators must make sure the power types and the test line connections are
normal.
3.1.2 START and STOP
START (square): to start up the instrument, once test starts, “DANGER” indicator lights.
STOP (circle): Stop key, used to cancel the test, or PASS, FAIL status.
3.1.3 Band and Model
Band and model
3.1.4 USB Interface
Externally connect to USB storage.
3.1.5 Indicator
● FAIL
When the test data exceeds the set data in test, the instrument will lights in FAIL.
● PASS
When the test data does not exceed the set data after the test, the instrument will lights in PASS.
When time function is off (TIMER OFF), there is no PASS judge. The test can be finished only by
pressing the ‘STOP’ key.

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3.1.6 FUNCTION
Select mode, system and interface.
● TEST
Press the key and the corresponding key lights, the instrument is ready to test.
● SETUP
Press the key and the corresponding key lights, the instrument enters parameter setting;
● SYSTEM
Press the key and the corresponding key lights, the system setting interface will be displayed;
● FILE
Press the key and the corresponding key lights, the file operation interface will be displayed;
3.1.7 HV
DANGER！！It lights in test, indicating the test is underway.
3.1.8 Output voltage HIGH terminal (HV)
High voltage output of the high voltage test interface.
3.1.9 Test low terminal, test current return terminal (LOW/RET)
Voltage output terminal and current sampling terminal of the test.
3.1.10 Move key
It is used for moving cursor on the screen.
3.1.11 Shortcut key
F1-F5 --- corresponding to the functional operation area on the right side of the LCD for quick
operation.
3.1.12 COPY key
COPY key can copy the screen pictures to the USB storage. The USB starage should be inserted into the
USB jack on the front panel in advance.
3.1.13 LCD screen
480*272 TFT dot- matrix LCD screen, display setting and test interface, etc.
3.2 Instruction of rear panel
Figure 3-2 gives a brief description of the rear panel for TH9310/20 series.

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HV OUTPUT
110V/220V～50/60Hz
HANDLE RS-232C
SIGNAL
USB
RTN/LOW
WARNING:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE AND RATING OF FUSE AS
SPECIFIED FOR THE LINE VOLTAGE BEING UTILIZED.
CAUTION:NO OPERATOR SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALITIFIED PERSONNEL.
!
!
HIGH VOLTAGE
MAX:5kV AC
1 2 3 4 5
6789
10
Figure 3-2
3.2.1 Fan
Power amplifier circuit radiator
3.2.2 Test low terminal, test current return terminal (optional)
Stand-by test low terminal of high voltage test interface
3.2.3 High voltage output terminal (optional)
Stand-by high voltage output terminal of high voltage test interface.
3.2.4 Power jack: with fuse holder, switchable line voltage mode
Be used to input AC power. Please use the voltage within the specified input voltage range and please
use the attached power line with fuse. Change the fuse according to input power.
Please choose different installation position according to different input power type. Please pay attention
to the visible identification on the outer shell of the fuse holder when installing.
NOTE: The instrument supports 110 and 220 line voltage modes only. Other modes are not
connected in the interior of the instrument.
3.2.5 Protective earth terminal
Be used to connect instrument to ground.
NOTE: The three-pin power jack of the instrument can not guarantee reliable connection to the
ground. The protective earth terminal must be used to connect the instrument to grounding bar.
3.2.6 Mark
This mark describes the serial number of the instrument.

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3.2.7 RS232C serial interface
Serial communication, realize the communication with the computer.
3.2.8 USB serial communication interface
Realize the communication with the computer. Through this interface, the computer can control the
instrument by using the control instruction set.
3.2.9 HANDLER interface
Compared to PLC interface, the HANDLER interface has no INTERLOCK function in interface signal.
It is more convenient than PLC interface to use 9-core D-type jack to output. It is appropriate for the
connection of general control circuit for multiple instruments.
TEST：Output synchronized-signal control when high voltage output is started.
START：Input the starting signal for starting high voltage output, corresponding to START signal
on the front panel.
RESET：Input the reset signal for stopping high voltage output, corresponding to STOP signal on
the front panel.
PASS：The output pass signal of the instrument, corresponding to PASS instruction on the front
panel.
FAIL：The output fail signal of the instrument, corresponding to FAIL instruction on the front
panel.
3.2.10 SIGNALinterface
It is the interface for online protection and interior 24V power output.
INTERLOCK：
(Port: (5) INTERLOCK + -- (6) COM)valid in SHORT.
It is the online locking signal of the instrument and short circuit jumper connection is used by
default. If disconnect, starting output is not allowed.
DC 24V Power:
(Port: (COM (1, 2) 24V –(3, 4) GND)
Output voltage is 18.5VAC rectified output, without voltage regulation function
It is used for requirement of indicator light and other control power supply. It is recommended to
use a total current smaller than 500mA.
3.3 Multichannel module declaration
Multi-channel Output is an internal high-voltage switching module attached at the bottom of the
instrument.
Through multi-channel output module, multiple test points of the components can be connected with
multiple channels at a time. During testing, the instrument can be set to control the channel switch.
Controllable testing can be achieved by connecting the corresponding port to withstand voltage test
terminal.

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With this multi-channel module, rapid connection can be achieved through test fixture without changing
ports during the testing process.
The test connection diagram is as follows:
3.4 Description
TH9320: Provide 5kV AC/20mA withstanding voltage, 6kV DC/10mA withstanding voltage and
insulation resistance test.
TH9310: Provide 5kV AC/10mA withstanding voltage, 6kV DC/5mA withstanding voltage and
insulation resistance test.
TH9310B: Provide 5kVAC/10mAwithstanding voltage test.
The principle structure of the instrument: In high voltage module, there is a DA standard,
controllable forcing function generator, AB power amplifier, 40~600Hz high voltage boost transformer
and output voltage closed-loop control.
DA standard: ensure controllable output voltage amplitude.
Controllable forcing function generator: In AC output, set the operation in 50 or 60Hz，not being
limited by line voltage.
Linear power amplifier: low distortion of the voltage waveform with easy control and high
reliability.
40~600Hz high voltage boost transformer: to DC and insulation resistance test, the test instrument
uses 600Hz AC to form DC voltage to be the power, which can assure the DC power ripple is far less
than the formal withstanding voltage tester.
Output voltage closed-loop control: ensure small load regulation and reliable test data.
Software of the instrument: multiparameter continuous test and multiple upper computer control
function.
TH9310/20 series not only can perform the independent AC withstanding test, DC withstanding
voltage test, insulation resistance test, but also multi-item test via the setting of test programme.
TH9310/20 series all allocate HANDLER, RS-232C and USB, thus the instrument can adapt to
the auto test system of different required safety and reliability.

◇18
Feature：
■Four test functions—AC withstanding voltage test, DC withstanding voltage test, and
insulation resistance test, open and short detection.
TH9310, TH9320 provideAC/DC withstanding voltage test and insulation resistance test.
TH9310B provideAC withstanding voltage test.
All the instruments have the open and short detection function.
Once connected with load, the tester can perform different tests continually.
■Multi-channel function
TH9320-S4/S8 has 4/8 programmable test channels. With appropriate test fixtures,
program-controlled and fast connection of components can be realized, and the test speed of
multi-parameter measurement can be greatly accelerated.
Simultaneously, the following functions can be achieved:
1. Combine into the TH90010 test system: connecting with the TH2882AS, use the withstand
voltage channel to switch the inter-turn voltage test. At the same time, the withstand voltage and
inter-turn withstand voltage sequential test capability can be achieved by programming.
2. Perfect contact check (node link check): Use two channels to connect one node at the same
time to conduct the continuity test and implement instrument-to-node connection reliability
testing.
■Two different test power selection
In TH9320 series high voltage module, there is a AB power amplifier circuit and a 100VA high
voltage transformer, which can realize the output of 5kV/20mA (AC) and the output of 6kV/10mA
(DC). The distortion of the waveform is less than 3%.
In TH9310 series high voltage module, there is a AB power amplifier circuit and a 50VA high
voltage transformer, which can realize the output of 5kV/10mA and the output of 6kV/5mA (DC).
The distortion of the waveform is less than 3%.
If continuous current output is set, in order to guarantee the reliability of the instrument, the
maximum output time is 60 seconds when the output is more than 60% of the rated output current.
If the output is within 60%~40% of the rated output current, the continuous working hours should
be limited. If the output is less than 40% of the rated output current, it can ensure continuous
working.

◇19
Figure 3-3AC voltage load regulation
■DC withstanding voltage test 5kV/10mA（TH9320/A）5kV/5mA(TH9310/A)
TH9310/20 series can provide DC withstanding voltage test of wide voltage range (Max. output
DC is 6kV). The automatic voltage regulation and voltage load regulation of 600Hz frequency
hardware is less than 1%+10V.
Figure 3-4 TH9320/ADC voltage output range
■Insulation resistance test 0.050kV to 1.000kV（resolution of 1V）/0.1MΩ to 10.0GΩ (Max.
rated current of TH9320 is 10mAand max. rated current of TH9310 is 5mA)
Insulation resistance test range:
Voltage ＜500V: 0.1MΩ to 1GΩ accuracy：±[10% reading +5 digits]
Voltage ＞500V: 0.1MΩ to 100MΩ accuracy：[5% reading +5 digits]
100MΩ to 1GΩ accuracy：[10% reading +5 digits]

◇20
■Open and short detection: judge the reliability of the DUT before starting the high voltage
to ensure the accuracy and safety of high voltage test.
Open and short detection can judge the distribution impedance current of more than 100PF. When
the current is less than this value, the current acquisition circuit resolution of the instrument can not
distinguish the connection of open circuit and the test component accurately.
■RS-232C interface as the standard
Except power switch, key lock and execution (auto), other functions can be controlled remotely. In
DC withstanding voltage test, AC withstanding voltage test and insulation resistance test, judge and
time can be controlled remotely. The test result can also be read via remote control. USB and
RS-232C interface provides a stable and united standard test interface for PC or other devices.
■HANDLER and SIGNALinterfaces bring convenience for the connection and control.
HANDLER interface can input START and STOP signals and output TEST, PASS and FAIL
signals. Connecting with a footswitch, they can construct a foot-control device; while connecting
with simple test fixtures, they can realize safety interlock, air controls, test indication, etc.
SIGNAL interface can input INTERLOCK signal and provide 24V, 0.5A power output. It is
convenient for control and connection.
■USB interface for backup
Through the USB interface equipped by all testers, tester programmed test programmes and
customer’s measuring file can be saved to or recalled from an external U disk, which is convenient
to set, use and file a batch of testers.
■Waiting time setup function
The instrument can set the test waiting time from 0.1s to 999.9s by a resolution of 0.1s. In this period,
the tester will output TEST control signals. They are used to control external devices and ensure a
reliable connection.After that high voltage measurement will be enabled.
■Rising time control function
In AC withstanding voltage test, DC withstanding voltage test and insulation resistance test, the test
voltage can be raised to set value slowly, it can’t provide set voltage to DUT instantly after test starts.
The voltage rise time is from 0.1s to 999.9s and the resolution is 0.1s. TH9310/20 series meet each
UL test standard and IEC withstanding voltage standard（primary voltage is less than the half of test
voltage and it can appoint the fixed rising time when reaching the set test voltage.
■Fall time control function
In the pass judge of AC withstanding voltage test, the test voltage can be reduced gradually. The
voltage fall time can be set within 0.1s to 999.9s (with the resolution of 0.1s).
■Discharge function
In common condition, the DUT reacts the feature of capacitance. At the moment of the cut of DC
withstanding voltage and insulation resistance test, the DUT holds the full charge status, so there is a