HOPETECH HT9980A User manual

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PV Safety Comprehensive Tester
User’s Manual
HT9980A/HT9981A

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Safety Tips
Warning Danger
When the following abnormal situations occur, do stop operating and turn off the power immediately,
otherwise, fire and electric shock would be caused. Call your dealer or Hope Electronics representative
for help.
⚫Improper device operation
⚫Abnormal noise, odors, smoke or flash occurred in operation
⚫The device produces a high temperature or electric shocks during the operation
⚫Damage of power cord, power switch or power socket
⚫Impurities or liquid enter the device
Safety Information
Warning Danger
Mishandling during using could result in injury or death, as well as damage to the product. Be certain that
you understood the instructions and precautions in the manual before use.
Disclaimer
Before using the product, be sure to carefully read the following safety
notes. If users do not observe the following instructions, Hope Electronic
Science and Technology will not blame for any of users’ loss.
Instrument grounding.
In order to avoid electric shock, please ground the instrument.
Avoid using
instrument in the
environment with
explosive gas
Avoid using the instrument in the environment with explosive gas, vapor or
dust environment. Using any electronic instrument in such environment is
dangerous.
Do not open the
instrument cover
Only authorized service personnel should remove the cover and have internal
access to the instrument for repairing. The instrument still has residual
charge, which may cause electric shock, after it’s shut down in a period of
time.
Do not use damaged
the instrument
If the instrument has been damaged, the risk will be unpredictable. Please
disconnect the power cord and no longer use the instrument. Do not attempt
to maintenance the device by yourself.
Do not use unusual
instrument work
If the instrument is not working properly, the risk will be unpredictable. Please
disconnect the power cord and no longer use the instrument, Do not attempt
to maintenance the device by yourself.
Do not exceed the
designated use of
instrument in manual
Beyond the scope, the protection of instrument provided will be ineffective.
Statement
The registered logo is the trademark of Hope Electronics Science and
Technology Co., Ltd.

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Limited Security and Responsibility Scope
Hopetech Electronics Technology Co., Ltd ensure that each HT9980A/HT9981A you purchased is fully
qualified in terms of quality and measurement. This guarantee does not include fuses.
Hopetech Electronics commits that the instrument has no defects in materials and process, such as
product quality problems under warranty. If the product is proved to be defective, Hope Electronics will
repair or replace it free of charge.
Since the date of delivery, Hope Electronics commits that the product has two years guarantee, while
other accessories have one year. Under warranty, any failure of hardware or software of the product will
be due to the quality of the product itself. Users provide the product warranty and maintenance card to
get free maintenance which provides from the maintenance department or its authorized maintenance
agent of Hope Electronics. Any maintenance beyond the warranty period should be at user’s own
expense.
For free maintenance product, Hope Electronics commits that it would be repaired and returned to
customer within five working days on receipt of the equipment unless otherwise specified. Hope
Electronics affords the cost of the return transportation.
Any of the following circumstances occurred; Hope Electronics will not repair for free.
1) Accidental damage caused by transportation
2) Improper installation or instrument failure or damage is caused by non-use work environment
3) Artificial damage to the appearance of the products (such as surface scratches, deformation, etc.)
4) Unauthorized repair, alteration, replacement of instrument and product has been tearing up the
warranty seal
5) The fault or damage is caused by irresistible factors (such as lightning strikes)
6) Directly or indirectly damage is caused by improper operation of the user
If mismeasurement or immeasurable is caused by the improper operation of the user, but not the
problem of the instrument itself, the cost of transit should be paid by user.

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Table of Content
Safety Tips........................................................................................................................................... 2
Safety Information............................................................................................................................... 2
Statement............................................................................................................................................ 2
Limited Security and Responsibility Scope......................................................................................... 3
Chapter 1 Safety Rules.............................................................................................................................. 6
1.1 General provisions........................................................................................................................ 6
1.2 Care and Maintenance.................................................................................................................. 6
1.2.1 User maintenance............................................................................................................... 6
1.2.2 Regular maintenance ......................................................................................................... 7
1.2.3 User Modification................................................................................................................ 7
1.3 Test environment........................................................................................................................... 7
1.3.1 Work Location..................................................................................................................... 7
1.3.2 Input Power......................................................................................................................... 7
1.3.3 Workplace........................................................................................................................... 7
1.4 Operator Regulations.................................................................................................................... 8
1.4.1 Qualification of personnel................................................................................................... 8
1.4.2 Safety Rules ....................................................................................................................... 8
1.4.3 Dress Code......................................................................................................................... 8
1.4.4 Medical Regulations........................................................................................................... 8
1.5 Test Safety Procedure Requirements........................................................................................... 8
1.6 Safety Points................................................................................................................................. 9
Chapter 2 Safety Regulations.................................................................................................................. 10
2.1 The Importance of Testing .......................................................................................................... 10
2.2 AC and DC Hi-pot Test................................................................................................................ 10
2.3 Advantages and disadvantages of DC testing.............................................................................11
2.3.1 Characteristics and advantages and disadvantages of AC withstand voltage (ACW) test
....................................................................................................................................................11
2.3.2 Advantages & Disadvantages of DC Testing.................................................................... 12
2.4 Insulation resistance test ............................................................................................................ 12
2.5 Ground Resistance Test.............................................................................................................. 13
Chapter 3 Technical Specification ....................................................................................................... 14
3.1 Product Description..................................................................................................................... 14
3.2 DC Hi-pot Test Parameters......................................................................................................... 14
3.3 Insulation resistance test parameters......................................................................................... 15
3.4 Ground resistance test parameters........................................................................................... 16
Chapter 4 Instrument Overview............................................................................................................ 20
4.1 Front Panel.................................................................................................................................. 20
4.1.1 Front View......................................................................................................................... 20
4.1.2 Front Panel Description.................................................................................................... 20
4.2 Rear Panel.................................................................................................................................. 21
4.2.1 Schematic diagram of the rear panel ............................................................................... 21
4.2.2 Rear panel description...................................................................................................... 21
4.3 Instrument Size........................................................................................................................... 22
Chapter 5 Operating Procedures and Steps........................................................................................ 23
5.1 Instructions.................................................................................................................................. 23
5.2 Steps........................................................................................................................................... 23
Chapter 6 Remote Input and Output Signals...................................................................................... 26
6.1 Input and Output Signals ............................................................................................................ 26
6.2 Remote control output signal wiring and description.................................................................. 26
6.3 Remote Control Input Signal Wiring Instructions........................................................................ 26
Chapter 7 Automatic Discharge Circuit............................................................................................... 27
7.1 Discharge Principle..................................................................................................................... 27
7.2 Precautions.................................................................................................................................27
Chapter 8 Test Parameter Setting ........................................................................................................ 28
8.1 Test Parameter Description......................................................................................................... 28
8.2 Measurement Parameter Setting................................................................................................ 30

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Chapter 9 System Parameter Setting ................................................................................................... 40
9.1 System parameter description.................................................................................................... 40
9.2 System Parameter Setting.......................................................................................................... 40
Chapter 10 Maintenance Guide ............................................................................................................ 44
10.1 Routine maintenance................................................................................................................ 44
10.2 Simple troubleshooting ............................................................................................................. 44
10.3 Quality Assurance..................................................................................................................... 44

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Chapter 1 Safety Rules
Thank you for purchasing our products. Please read this manual before use,
and keep it handy for future reference.
In this chapter you will learn the following:
⚫General provisions
⚫Care and maintenance
⚫Test environment
⚫Operator regulations
⚫Test safety procedures
⚫Safety points
1.1 General provisions
Before using this tester, please read the instructions carefully to understand the
operating procedures and related safety notes to ensure safety.
Before turning on the input power switch of this tester, please select the correct input
voltage (110V or 220V) specifications.
Danger indicates high voltage output, do not contact.
Ground indicates chassis ground symbol
WARNING Indicates a potentially hazardous situation that will result in
death or serious injury to the operator.
The voltage and current generated by the tester are sufficient to cause personal injury.
In order to prevent accidental injury or death, be sure to observe the tester clearly
before proceeding it.
1.2 Care and Maintenance
1.2.1 User maintenance
To prevent electric shock, non-professionals should not open the cover of the instrument.All parts inside
WARNING

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the instrument must not be changed without permission. If an abnormality occurs to the instrument,
please seek the help of Hopetech authorized distributor.
1.2.2 Regular maintenance
For HT9980A/HT9981Atester, input power cords, test leads and related accessories must be carefully
inspected and calibrated at least once a year to ensure the safety of the operator and the accuracy of the
instrument.
1.2.3 User Modification
The user must not modify the wiring or parts of the instrument, otherwise the company's warranty will be
invalidated and Hopetech will take no responsibility for the consequences caused by the modification.
1.3 Test environment
1.3.1 Work Location
When operating this instrument, make sure that the instrument is placed in a place where ordinary
personnel cannot touch it at will. If this is not possible in your production line site, the test area must be
isolated from other facilities and a " HIGH-VOLTAGE TEST WORK AREA" must be marked. If
high-voltage test work area is very close to other work areas, special attention must be paid to safety.
During the high voltage test, it must be marked "DANGER! !HIGH-VOLTAGE TEST IN PROCESS, DO
NOT ENTER,AUTHERIZED PERSONNEL ONLY "
1.3.2 Input Power
The tester must be well grounded, and the ground wire must be connected before testing to ensure the
safety of the operator.
The test zone power supply must have a separate switch installed at the entrance of the test zone to
ensure that everyone can identify it. In case of emergency ,the power switch can be turned off
immediately.
1.3.3 Workplace
⚫Use a workbench made of non-conductive material as possible as you can. Do not use any metal
between the operator and the test object.
⚫The operator must not be across the object under test to operate or adjust the tester.
⚫If the object volume is small, it is better to place it in a non-conductive box.
⚫The test site must be kept tidy and clean at all time. Do not use this tester near flammable materials.
Place unused tester and test leads in a fixed position.

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⚫Make sure that all personnel can immediately tell the object under test, object to be tested, and
tested object.
⚫The test area and the surrounding air must not contain flammable gases, and the tester should not
be used near flammable materials.
1.4 Operator Regulations
1.4.1 Qualification of personnel
The voltage and current output by the tester will result in death or serious injury to the operator.
The tester must be used and operated by trained and qualified personnel.
1.4.2 Safety Rules
Operators must be educated and trained regularly to understand the importance of various operating
rules and operate the tester in accordance with safety rules.
1.4.3 Dress Code
Operators are not allowed to wear clothes with metal decoration or metal bracelets and watches, which
are easy to make an accidental electric shock. The consequences are even more severe when you get
an electric shock.
1.4.4 Medical Regulations
The tester must not be operated by a person with a heart attack or with a pacemaker.
1.5 Test Safety Procedure Requirements
Never use the tester on a live circuit board or device! !
During the test, never touch the test object or any objects connected to
the test object.
The ground wire of the tester must be connected in accordance with regulations.
When connecting the test line, you must first connect the test end on the tester to object to be tested.
The high-voltage test lead can only be plugged into the high-voltage output before testing. When holding
the high-voltage test lead, it must be held in an insulated part, never hold a conductive body.
The operator must be able to operate the tester completely independently. It is not allowed for others to
control the switch or remote-control the switch. When the remote control switch is not in use, it should be

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placed in a fixed position and cannot be placed at will.
1.6 Safety Points
⚫Non-qualified operators and unrelated personnel should stay away from the
high-voltage test area.
⚫Always be safe and orderly in the high-voltage test area.
⚫Never touch the test object or any object connected to the test object during the high
voltage test.
⚫In case of any problems, turn off the high voltage output and input power immediately.
⚫After the DC withstand voltage and insulation resistance tests, the discharge operation
must be performed before the test wire can be removed.

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Chapter 2 Safety Regulations
In this chapter you will learn the following:
⚫The importance of testing
⚫Hi-pot test
⚫Advantages and disadvantages ofAC test and DC test
⚫Insulation resistance test
2.1 The Importance of Testing
In today's high consumer awareness, every electrical and electronic product manufacturer must do its
best to integrate products safety. Each product must be designed to the best of its ability to prevent the
user from being exposed to electric shock. Even if the user makes an error, it should not be shocked. In
order to meet generally accepted safety requirements, safety testing must be performed. Current safety
regulations organization such as UL, CSA, IEC, BSI, VDE, TUV, and JSI all require manufacturers to
design and produce electronics or electrical products using a "withstand voltage insulation tester" for
safety testing.
2.2 AC and DC Hi-pot Test
If a product can work normally in a very harsh environment, we can be sure that it will also work in a
normal environment. The most common use of a hi-pot test is as follows:
⚫Functional test at design-determine the conditions under which the product designed can meet its
functional requirements
⚫Specification test during production—Confirm that the product produced can meet the requirements
of its specifications.
⚫Confirmation test during quality assurance-confirm that the quality of the product can meet the
safety standards.
⚫Post-repair safety test—confirm that the repaired product can maintain compliance with safety
standards.
Different products have different technical specifications. Basically in the hi-pot test, a voltage higher
than the normal working voltage is added on the product tested and this voltage has to last for a period
of time. If a component at within the specified time, its leakage current also remains within the specified
range, it can be determined that this component works under normal conditions and should be very safe.
And excellent design and selection of good insulation materials can protect users from electric shock.
The hi-pot test performed by HT9980A/HT9981Atester is generally called "high-voltage dielectric test",
referred to as "withstand voltage test" for short. basic
It is specified that the working voltage of the test object is 2 ×1000V, which is used as the test voltage
standard. Test voltage for some products may be high
At 2 ×working voltage + 1000V. For example, the operating voltage range of some products is from
100V to 240V.
The test voltage may be between 1000V and 4000V or higher. In general, products with a "double
insulation" design
The test voltage used may be higher than the 2 ×working voltage + 1000V standard.

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The withstand voltage test is more precise in product design and sample production than in production.
The trial phase has already determined the safety of the product. Although only a few samples are used
to judge the product design,
Online testing should also strictly require that all products must pass safety standards to confirm that no
defective products will flow out of the production line.
The output voltage of the withstand voltage tester must be maintained in the range of 100% to 120% of
the specified voltage. AC withstand voltage test
The output frequency of the meter must be maintained between 40 and 70Hz, and its peak value must
not be lower than the root mean square (RMS) voltage value.
1.3 times and its peak value must not be higher than 1.5 times the root mean square (RMS) voltage
value.
2.3 Advantages and disadvantages of DC testing
Please confirm with the manufacturers designated by the product under test what voltage the product
should use. Some products accept both DC andAC test options, but there are still many products that
only accept either DC or AC tests. If safety regulations allow simultaneous DC and AC testing,
manufacturers can decide for themselves which test is more suitable for their products. To achieve this,
users must understand the advantages and disadvantages of DC and AC testing.
2.3.1 Characteristics and advantages and disadvantages of AC
withstand voltage (ACW) test
Features:
Most of the DUTs that do withstand voltage tests will contain some stray capacitor. AC testing may not be
fully charged these stray capacitors, so a continuous current will flow through them.
Advantages:
1. Generally speaking,AC testing is easier to be accepted by manufacturers than DC testing. Because
most products use AC power and the AC testing can test the positive and negative polarity of the
product at the same time. And the testing is consistent with products actual use conditions.
2. BecauseAC testing can not fully charged the stray capacitors and there is no instant surge current,
the full voltage can be added at the beginning of the test instead of increasing the voltage slowly,
unless the product is very sensitive to an Impulse voltage.
3.BecauseAC testing cannot fully charged those stray capacitors, it is not necessary to discharge
DUTs after the test.
Disadvantages:
1. The main disadvantage is that if the stray capacitance of the DUT is large or the DUT is a capacitive
load, in the case, the generated current will be much larger than the actual leakage current, hence the
actual leakage current cannot be known.
2.Another disadvantage, due to the current supplied to the stray capacitance of the DUT, the current
required by the instrument will be much higher than when using a DC testing method. This will
increase the danger to the operator.

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2.3.2 Advantages & Disadvantages of DC Testing
Features:
During the DC hi-pot test, the stray capacitor in the DUT is fully charged.
The capacitance current caused by the DC hi-pot test will drop to zero after the stray capacitance is fully
charged.
Advantages:
1. Once the stray capacitor in the DUT is fully charged, only the actual leakage current of the DUT will
remain. DC hi-pot test can clearly show the actual leakage current of the DUT.
2. Another advantage, DC hi-hop test only needs to supply the charging current of the DUT in a short
time, and other times the current supplied is very small, so the current capacity of the instrument is much
lower than the current capacity required during the AC hi-pot test.
Disadvantages: 1. Unless there is no capacitance in the DUT, the test voltage must start from "zero"
and slowly increase to avoid excessive charging current. The larger the capacity, the longer the ramp-up
time and the lower the voltage that can be increased at one time.
When the charging current is too large, it will definitely cause the tester to misjudge and make the test
result incorrect.
2.Because the DC hi-pot test will charge the DUT, after the test it must be discharged the DUT first
before next test.
3. Unlike the AC test, the DC hi-pot test can only be tested in a single polarity. If the product is to be used
in AC voltage, this disadvantage must be considered. This is also the reason why most safety
regulations recommend the use ofAC hi-pot testing.
4. In theAC test, the peak value of the voltage is 1.4 times that shown by the meter, which is not possible
for ordinary meters, DC hi-pot test can not shown. Therefore, most safety regulations require that if DC
hi-pot is used, the test voltage value must be increased to an equal value.
2.4 Insulation resistance test
The insulation resistance test mainly measures the resistance between the live wire of the appliance and
the casing. The measurement method is based on the principle of Ohm's Law, adding a voltage between
the live wire and the casing, then measure the voltage and current values separately, and then calculate
the resistance value according to Ohm's law. Generally, a large constant voltage (500V or 1000V DC) is
applied and maintained for a specified period of time and take this as a test standard.If the resistance is
kept within the specified specifications within the specified time, it can be determined that it is under
normal conditions the appliance should be relatively safe when it is running.
The higher the insulation resistance value, the better the insulation of a product. The insulation
resistance value measured by the insulation resistance test is the equivalent resistance values formed
between two test points and various related networks connected between them and their surroundings.
However, the insulation test cannot detect the following conditions:
⚫The insulation strength of the insulation material is too weak;
⚫The insulation strength of the insulation material is too weak;
⚫Pinholes on the insulator
⚫Insufficient distance between parts
⚫Insulator is crushed and cracked
⚫Each of these conditions can only be detected by a withstand voltage test.

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2.5 Ground Resistance Test
The ground resistance test mainly measures the contact resistance between the ground wire of the
appliance and the casing. The measurement method is based on the principle of Ohm's law, a current
flows on the contact point, then measure the current and voltage value of the contact point separately,
and then calculate the resistance value is according to Ohm's law. Generally, a large current flows, which
simulates the abnormal current conditions that occur when the appliance is abnormal, take this as a test
standard. If the contact resistance of the ground wire on the appliance can pass the test of this harsh
environment, the appliance should be safe under normal use conditions
Different products have different technical specifications. Basically, safety regulations require a constant
current to flow at the contact point. This current must be maintained for a specified period of time. If the
resistance of the contact point is maintained in the specified range within the specified time, It can be
determined that the appliance operates under normal conditions, and the appliance should be relatively
safe.Appropriate design and proper construction can protect users from the threat of accidental electric
shock.
Although contact resistance can be measured with a general resistance meter, the current output by the
resistance meter is usually very small, which does not meet the requirements of safety regulations and
cannot be recognized by safety inspection agencies. It must be measured with a special ground
resistance tester. Usually the user often touches the appliance. Except for the CSA specification, which
requires 30 amps, most security inspection agencies require 25 amps, at the same, the current must last
60 seconds and the resistance must be maintained below 100 mΩ.
The specifications of appliances that are not easily touched by the user are generally relatively loose,
generally requiring a current of 10 amps, the resistance value of the contact point needs to be less than
500 mΩ, and the time is considered 60 seconds. There are still some international standards that are
higher than the above standards, such as take 5 times the rated input current of the appliance as the test
standard, the resistance value of the contact point is still 100mΩ and the test time is 60 seconds. Most of
these are click-type appliances, which are highly dangerous, so the requirements for specifications are
higher than general appliances.
In the current safety regulations in the world, some specifically require that the contact resistance of the
ground wire be measured first. The resistance of the contact must meet the requirements before the
insulation withstand voltage test can be performed. This is mainly to prevent the misconception that the
insulation or withstand voltage is good because the ground wire is not connected properly.
The ground resistance tester has two types of output: AC and DC. Both types can accurately measure
the resistance value of the contact point, but the two types have significantly different destructive
properties for bad contact points. Because the calculation of resistance value is the effective value of
voltage and current, and the remaining effective value is the same as the peak value, however, the peak
value ofAC is 1.414 times the effective value. Therefore, when AC is at the peak, its current value is also
1.414 of DC. When comparing the energy generated at the contact point with theAC peak point, when
calculated according to the power theorem (power = square of the current ×resistance), the energy
generated by theAC peak instant at the contact point is twice that of DC. .
If you have questions about the operation of the instrument or problems related to the instrument,
please feel free to contact us.

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Chapter 3 Technical Specification
In this chapter you will learn the following
⚫Product introduction
⚫Test parameters
3.1 Product Description
HT9980A and HT9981A as PV safety testers used for photovoltaic module safety parameters, It’s also
be used for household appliances, electronic instruments, electronic equipment, electronic components,
wires and cables and other electrical products withstand voltage, insulation test and ground test.
This series of products have pass / fail judgment function, sound and light alarm function and automatic
test time control function, etc. Easy to operate, beautiful appearance, fast over-current cutting speed. It
is the ideal hi-pot insulation testing equipment.
3.2 DC Hi-pot Test Parameters
Model
HT9980A
HT9981A
Voltage output
Voltage output range
0.010kV to 6.000kV
0.010kV to 9.999kV
Voltage output accuracy
士(3% set value+5V)
士(3% set value +5V)
Voltage output resolution
0.001KV
0.001KV
Output maximum rated
power
36VA (6000V 6mA)
20VA (10000V 2mA)
Output voltage stability
士(1% set value + 5V)
士(1% set value + 5V)
Voltage display
Measurement range
0.010kV to 6.000kV
0.010kV to 9.999kV
Display resolution
0.001kV
0.001kV
Measurement accuracy
士(3% set value+0.005kV)
士(3% set value+0.005kV)
Current measurement
Range
10.00uA-99.99uA
100.0uA-999.9uA
1.000mA-6.000mA
Resolution
0.01uA
0.1uA
0.01mA
Accuracy
士(2% + 2 count)
士(2% + 2 count)
士(2% + 2 count)
Rise time
0.4s to 999.9s
Test time
0.1s to 999.9s （0 = Continuous）

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Fall time
0.1s to 999.9s （0 = OFF）
Time resolution
0.1s
Time accuracy
±(0.1% set value+0.05 s)
Arc Level
Range:1-9 (0 = OFF)
Discharge time
<50mS(without load connected)
<100ms (connecting capacitive load (capacitance less than 0.1uF))
Capacitive load maximum 1uF < 1kV 0.75uF < 2kV
0.5uF < 3kV 0.08uF < 4kV
0.04uF < 5kV 0.015uF < 6kV
3.3 Insulation resistance test parameters
Model
HT9981A
Voltage output
IR
Voltage output
range
0.500kV to 3.000kV
Voltage output
resolution
0.001kV
Voltage output
accuracy
士(3% set value+0.005kV)
Maximum rated
power
6VA（3000V6mA）
Maximum current
6mA
Voltage display
IR
Range
0.500kV to 3.000kV
Display resolution
0.001kV
Measurement
accuracy
士(3% set value+5V)
Resistance display
IR
Measurement
range
100KΩ to 99GΩ
Display mode
100 KΩ～999KΩ；1.00MΩ～9.99MΩ；10.0MΩ～99.9MΩ；
100MΩ～999MΩ；1.00GΩ～9.99GΩ；10GΩ～99GΩ；
Display accuracy
±(2% display value +3 count) 100KΩ≤R≤9.99GΩ；
±(20% display value +3 count) 10GΩ≤R≤99GΩ；
（When the test lead has no swing）
Parameter setting
Upper limit setting
100KΩ to 99GΩ

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Judgment
function
Lower limit setting
100KΩ to 99GΩ
Judging accuracy
100KΩ≤R≤9.99GΩ ±( 3% display value +3 count)；
10GΩ≤R≤50GΩ ±(20% display value+3 count)；
Timing
function
Test time
0.1s to 999.9s
Time resolution
±(0.1% set value+0.05 s)
3.4 Ground resistance test parameters
Model
HT9980A
Output parameters
Output current
range
10A ～60A
Output current
accuracy
士(2% set value+5 count)
Output current
resolution
0.01A
Output maximum
rated power
360VA (6V60A)
Maximum output
voltage
6V
Output voltage
ripple
Full load <300mVp-p
Current stability
±1.0%
Current display
Display range
10A ～60A
Display resolution
0.01A
Measurement
accuracy
士(2% +3 count)
Resistance display
Display range
0.00uΩ ～600.00mΩ
Display resolution
0.01mΩ （600.00mΩ ～100.00mΩ）；
0.001mΩ（99.999mΩ ～10.000mΩ）；
0.1uΩ （9.9999mΩ ～1.0000mΩ）；
Measurement
accuracy
士(2% display value +3 count)
Measurem
ent
accuracy
Setting range
0 ～600.00mΩ （10.00A ～20.00A）；
0 ～300.00mΩ （20.01A ～30.00A）；

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0 ～200.00mΩ （30.01A ～40.00A）；
0 ～150.00mΩ （40.01A ～50.00A）；
0 ～120.00mΩ （50.01A ～60.00A）；
Display resolution
0.01mΩ （600.00mΩ ～100.00mΩ）；
0.001mΩ（99.999mΩ ～10.000mΩ）；
0.1uΩ （9.9999mΩ ～1.0000mΩ）；
Measurement
accuracy
士(2% set value+3 count)
Measurement accuracy
Setting range
0 ～600.00mΩ （10.00A ～20.00A）；
0 ～300.00mΩ （20.01A ～30.00A）；
0 ～200.00mΩ （30.01A ～40.00A）；
0 ～150.00mΩ （40.01A ～50.00A）；
0 ～120.00mΩ （50.01A ～60.00A）；
Display resolution
0.01mΩ （600.00mΩ ～100.00mΩ）；
0.001mΩ（99.999mΩ ～10.000mΩ）；
0.1uΩ （9.9999mΩ ～1.0000mΩ）；
0.01uΩ （999.99uΩ ～0.00uΩ）；
Measurement
accuracy
士(2% set value+3 count)
Measurement
accuracy
Measurement
accuracy
0.5s ～999.9s（0.0s is Continuous testing）
Time resolution
0.1s
Time accuracy
±(0.1% set value+0.05 s)

18
Model
HT9981A
Output parameter
Output current
range
10A ～80A
Output current
accuracy
士(2% set value+5 count)
Output current
resolution
0.01A
Output maximum
rated power
360VA (6V80A)
Maximum output
voltage
6V
Output voltage
ripple
Full load <300mVp-p
Current stability
±1.0%
Current display
Display range
10A ～80A
Display resolution
0.01A
Measurement
accuracy
士(2% set value+3 count)
Resistance display
Display range
0.00uΩ ～600.00mΩ
Display resolution
0.01mΩ （600.00mΩ ～100.00mΩ）；
0.001mΩ（99.999mΩ ～10.000mΩ）；
0.1uΩ （9.9999mΩ ～1.0000mΩ）；
Measurement
accuracy
士(2% set value+3 count)
Resistance upper limit setting
Setting range
0 ～600.00mΩ （10.00A ～20.00A）；
0 ～300.00mΩ （20.01A ～30.00A）；
0 ～200.00mΩ （30.01A ～40.00A）；
0 ～150.00mΩ （40.01A ～50.00A）；
0 ～120.00mΩ （50.01A ～60.00A）；
0 ~ 80.0 mΩ （60.01A~ 70.00A）；
0 ~ 70.0 mΩ （70.01A~ 80.00A）；

19
Display resolution
0.01mΩ （600.00mΩ ～100.00mΩ）；
0.001mΩ（99.999mΩ ～10.000mΩ）；
0.1uΩ （9.9999mΩ ～1.0000mΩ）；
Measurement
accuracy
士(2% set value+3 count)
Resistance lower limit setting
Setting range
0 ～600.00mΩ （10.00A ～20.00A）；
0 ～300.00mΩ （20.01A ～30.00A）；
0 ～200.00mΩ （30.01A ～40.00A）；
0 ～150.00mΩ （40.01A ～50.00A）；
0 ～120.00mΩ （50.01A ～60.00A）；
0 ~ 80.0 mΩ （60.01A~ 70.00A）；
0 ~ 70.0 mΩ （70.01A~ 80.00A）；
Display resolution
0.01mΩ （600.00mΩ ～100.00mΩ）；
0.001mΩ（99.999mΩ ～10.000mΩ）；
0.1uΩ （9.9999mΩ ～1.0000mΩ）；
0.01uΩ （999.99uΩ ～0.00uΩ）；
Measurement
accuracy
士(2% set value+3 count)
Test time
Test time
0.5s ～999.9s（0.0S is continuous test）
Time resolution
0.1s
Time accuracy
±(0.1% set value+0.05 s)

20
Chapter 4 Instrument Overview
4.1 Front Panel
4.1.1 Front View
Figure.4.1 Front View
4.1.2 Front Panel Description
1：3 3.5 inch TFT display
2：Key area
3：Front panel ventilation area
4: Ground resistance test terminal
Drive+ current output positive end
Sense+ voltage sampling positive end
Sense- voltage sampling negative end (HV-Input withstand current return
terminal)
Drive- Negative terminal of current output
5: Hi-pot test terminal
OUTPUT OUTPUT high voltage output
INPUT current return
6: Function key area
7: USB socket
8: indicator position
PASS: Pass indicator
FAIL: Failed indicator