Extech Instruments 7630 User manual

7630
Touch Current Tester
Operation Manual
EXTECH Electronics Co., Ltd.
11F-1, No. 408, Ruiguang Rd., Neihu
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Website: http://www.extech-electronics.com
EVR 1.07

WARRANTY
EXTECH ELECTRONICS CO., LTD., certifies that the instrument listed in this manual meets
or exceeds published manufacturing specifications. This instrument was calibrated using
standards that are traceable to Chinese National Laboratory Accreditation (CNLA).
Your new instrument is warranted to be free from defects in workmanship and material for a
period of (3) years from date of shipment. During the warranty period, you must return the
instrument to EXTECH Electronics Co., or its branches or its authorized distributor for repair.
EXTECH Electronics Co., reserves the right to use its discretion on replacing the faulty parts or
replacing the assembly or the whole unit.
Any non-authorized modifications, tampering or physical damage will void your warranty.
Elimination of any connections in the earth grounding system or bypassing any safety systems
will void this warranty. This warranty does not cover batteries or accessories not of EXTECH
manufacture. Parts used must be parts that are recommended by EXTECH as an acceptable
specified part. Use of non-authorized parts in the repair of this instrument will void the
warranty.
This warranty does not cover accessories not of EXTECH manufacture.
Except as provided herein, EXTECH makes no warranties to the purchaser of this instrument
and all other warranties, express or implied (including, without limitation, merchantability or
fitness for a particular purpose) are hereby excluded, disclaimed and waived.

1. Introduction........................................................................................................1
1.1 Safety Symbols ................................................................................................................ 1
1.2 Glossary of Terms (As used in this manual)................................................................. 2
1.3 Safety................................................................................................................................ 3
1.3.1 Service and Maintenance...........................................................................................3
1.3.2 Test Station................................................................................................................. 4
1.3.3 Test Operator.............................................................................................................. 5
1.3.4 Instrument Connections............................................................................................. 5
1.3.5 Key Safety Points to Remember................................................................................ 6
1.4 Introduction to Product Safety Testing......................................................................... 7
1.5 Safety Test........................................................................................................................ 7
1.5.1 Dielectric Withstand Voltage Test.............................................................................. 7
1.5.2 Insulation Resistance Test........................................................................................10
1.5.3 Ground Continuity Test or Ground Bond Test......................................................... 11
1.5.4 RUN Test ................................................................................................................. 11
1.5.5 Touch Current Test................................................................................................... 11
2. Getting Started .................................................................................................13
2.1 Unpacking and Inspection ........................................................................................... 13
2.2 Installation..................................................................................................................... 14
2.2.1 Power Requirements................................................................................................14
2.2.2 Basic Connections ...................................................................................................14
2.2.3 Environmental Conditions....................................................................................... 15
3. Specifications and Controls ............................................................................16
3.1 Specifications................................................................................................................. 16
3.2 Front Panel Controls .................................................................................................... 28
3.3 Rear Panel Controls...................................................................................................... 30
3.4 OPT.753 HV & GB Link Module ............................................................................. 34
4. Description of Setting ......................................................................................36
4.1 Setup System Menu ...................................................................................................... 38
4.1.1 Time and Date.......................................................................................................... 38
4.1.2 Calibration Alert ...................................................................................................... 40
4.1.3 Hardware..................................................................................................................41
4.1.4 Security ....................................................................................................................43
4.1.5 Power-On Screen .....................................................................................................45
4.2 Setup Tests Menu .......................................................................................................... 47
4.2.1 Add........................................................................................................................... 47
4.2.2 Edit........................................................................................................................... 48
4.2.3 Delete.......................................................................................................................48
4.2.4 Prompt...................................................................................................................... 48
4.2.5 File ...........................................................................................................................49
4.2.6 Fail Stop................................................................................................................... 50
4.3 Test Parameters............................................................................................................. 51
4.3.1 Description of Test Parameters ................................................................................ 52
4.3.2 Run Test (OPT.752) ................................................................................................. 53
4.3.3 Touch Current Test...................................................................................................57
4.5 Setting Up a Test ........................................................................................................... 70

6
5. Operating Instructions ....................................................................................73
5.1 Instrument Connections ............................................................................................... 73
5.2 Perform Tests................................................................................................................. 75
5.2.1 Load File..................................................................................................................75
5.2.2 Single Step ...............................................................................................................76
5.2.3 Fail Stop...................................................................................................................76
5.2.4 Results......................................................................................................................77
5.3 Displayed Messages....................................................................................................... 78
5.3.1 Test Status Messages................................................................................................78
5.3.2 Fatal Error................................................................................................................80
6. Interface ............................................................................................................81
6.1 Connection of Remote I/O............................................................................................ 81
6.1.2 Signal Outputs on Remote I/O.................................................................................81
6.1.2 Signal Inputs of Remote I/O and Programmed Test Files .......................................82
6.2 Scanner & Input Source I/O Signal Control Interface..............................................85
6.2.1 Input Source I/O Signal Control Interface...............................................................85
6.2.2 Scanner I/O Signal Control Interface.......................................................................85
6.3 Bus Remote Interface GPIB / RS-232 .........................................................................86
6.2.1 GPIB Messages........................................................................................................86
6.2.2 Functions..................................................................................................................86
6.2.4 GPIB Connector.......................................................................................................87
6.2.5 GPIB Address ..........................................................................................................88
6.2.6 Interface Functions ..................................................................................................88
6.2.7 RS-232 Interface......................................................................................................89
6.2.8 GPIB / RS-232 Interface Command List.................................................................89
6.3 IEEE 488.2 Common Commands................................................................................ 93
6.3.1 Status Reporting.......................................................................................................95
7. CALIBRATION ...............................................................................................97
7.1 Calibration Initialization..............................................................................................97
7.1.1 Selecting Specific Calibration points.......................................................................97
7.1.2 Calibration points.....................................................................................................98

1
1. Introduction
1.1 Safety Symbols
Product will be marked with this symbol when it is necessary to refer to the
operation and service manual in order to prevent injury or equipment damage.
Product will be marked with this symbol when hazardous voltages may be present.
Product will be marked with this symbol at connections that require earth grounding.
Calls attention to a procedure, practice, or condition that could possibly
cause bodily injury or death.
Calls attention to a procedure, practice, or condition that could possibly
cause damage to equipment or permanent loss of data
WARNING
CAUTION

2
1.2 Glossary of Terms (As used in this manual)
Alternating Current, AC: Current that reverses direction on a regular basis, commonly in
the U.S.A. 60 per second, in other countries 50 times per second.
Breakdown: The failure of insulation to effectively prevent the flow of current sometimes
evidenced by arcing. If voltage is gradually raised, breakdown will begin suddenly at a
certain voltage level. Current flow is not directly proportional to voltage. Once breakdown
current has flown, especially for a period of time, the next gradual application of voltage will
often show breakdown beginning at a lower voltage than initially.
Conductive: Having a volume resistivity of no more than 103 ohm-cm or a surface
resistivity of no more than 105 ohms per square.
Conductor: A solid or liquid material which has the ability to let current pass through it, and
which has a volume resistivity of no more than 103 ohm-cm.
Current: The movement of electrons through a conductor. Current is measured in amperes,
milliamperes, microamperes, nanoamperes, or picoamperes. Symbol = I
Dielectric: An insulating material that is positioned between two conductive materials in
such a way that a charge or voltage may appear across the two conductive materials.
Direct Current, DC: Current that flows in one direction only. The source of direct current
is said to be polarized and has one terminal that is always at a higher potential than the other.
Hipot Tester: Common term for dielectric-withstand test equipment.
Insulation: Gas, liquid or solid material which has a volume resistivity of at least 1012
ohm-cm and is used for the purpose of resisting current flow between conductors.
Insulation Resistance Tester: An instrument or a function of an instrument capable of
measuring resistance's in excess of 200 megohms. Usually employs a higher voltage power
supply than used in ohmmeters measuring up to 200 megohms.
Leakage: AC or DC current flow through insulation and over its surfaces, and AC current
flow through a capacitance. Current flow is directly proportional to voltage. The insulation
and/or capacitance are thought of as a constant impedance, unless breakdown occurs.
Resistance: That property of a substance that impedes current and results in the dissipation
of power, in the form of heat. The practical unit of resistance is the ohm. Symbol = R
Trip Point: A minimum or maximum parameter set point that will cause an indication of
unacceptable performance during a run test.
Voltage: Electrical pressure, the force which causes current through an electrical conductor.
Symbol = V

3
1.3 Safety
•This product and its related documentation must be reviewed for familiarization with safety
markings and instructions before operation.
•This product is a Safety Class I instrument (provided with a protective earth terminal).
•Before applying power, please verify that the instrument is set to the correct line voltage
(115V or 230V) and the correct fuse is installed.
•Must connect with isolated oscilloscope to BNC connect to take waveform
A Hipot produces voltages and currents that can cause harmful or fatal
electric shock. To prevent accidental injury or death, these safety
procedures must be strictly observed when handling and using the test instrument.
1.3.1 Service and Maintenance
User Service
To prevent electric shock do not remove the instrument cover. There are no user serviceable
parts inside. Routine maintenance or cleaning of internal parts is not necessary. Avoid the
use of cleaning agents or chemicals on the instrument, some chemicals may damage plastic
parts or lettering. Any external cleaning should be done with a clean dry or slightly damp
cloth. Schematics, when provided, are for reference only. Any replacement cables and high
voltage components should be acquired directly from EXTECH Electronics Co. Ltd.. Refer
servicing to EXTECH Electronics Co. Ltd. customer support department.
TAIWAN
Taipei：
Tel：[phone] Ext.2333
Fax：[phone]
Email：[email protected]
Kaohsiung：
Tel：[phone]
Fax：[phone]
Email：[email protected].tw
MALAYSIA：
Tel：[phone]
Fax：[phone]
Email：[email protected]
CHINA
Guangzhou：
電話：86-20-85538831 Ext.8333
傳真：86-20-85538710
Email：[email protected]
Suzhou：
電話：86-512-68088351 Ext.7333
傳真：86-512-68088359
Email：[email protected]
WARNING

4
User Modifications
Unauthorized user modifications will void your warranty. EXTECH Electronics will not be
responsible for any injuries sustained due to unauthorized equipment modifications or use of
parts not specified by EXTECH Electronics. Instruments returned to EXTECH Electronics
with unsafe modifications will be returned to their original operating condition at the
customers expense.
1.3.2 Test Station
Location
Select an area away from the main stream of activity which employees do not walk through in
performing their normal duties. If this is not practical because of production line flow, then
the area should be roped off and marked for HIGH VOLTAGE TESTING. No employees
other than the test operators should be allowed inside.
If benches are placed back-to-back, be especially careful about the use of the bench opposite
the test station. Signs should be posted: "DANGER - HIGH VOLTAGE TEST IN
PROGRESS - UNAUTHORIZED PERSONNEL KEEP AWAY."
Power
Dielectric Voltage-Withstand Test Equipment must be connected to a good ground. Be
certain that the power wiring to the test bench is properly polarized and that the proper low
resistance bonding to ground is in place.
Power to the test station should be arranged so that it can be shut off by one prominently
marked switch located at the entrance to the test area. In case of an emergency, anyone can
cut off the power before entering the test area to offer assistance.
Work Area
Perform the tests on a non-conducting table or workbench, if possible. If you cannot avoid
using a conductive surface, be certain that it is connected to a good earth ground and the high
voltage connection is insulated from the grounded surface.
There should not be any metal in the work area between the operator and the location where
products being tested will be positioned. Any other metal in the work area should be
connected to a good ground, never left "floating".
Position the tester so the operator does not have to reach over the product under test to activate
or adjust the tester. If the product or component being tested is small, it may be possible to
construct guards or an enclosure around the device to be tested. Construct the guards of a
non-conducting material such as clear acrylic, so that the item being tested is within the guards

5
or enclosure during the test. If possible, the guards or enclosure should also contain safety
switches that will not allow the tester to operate unless the guards are in place or the enclosure
closed.
Keep the area clean and uncluttered. All test equipment and test leads not necessary for the
test should be removed from the test bench and put away. It should be apparent to both the
operator and to any observers, the product that is being tested and the product that is waiting to
be tested, or has already been tested.
Do not perform Hipot tests in a combustible atmosphere or in any area where
combustible materials are present.
1.3.3 Test Operator
Qualifications
This instrument generates voltages and currents that can cause harmful or fatal electric
shock and must only be operated by a skilled worker trained in its use.
The operator should understand the electrical fundamentals of voltage, current, and resistance.
They should recognize that the test instrument is a variable high-voltage power supply with
the return circuit directly connected to earth ground, therefore, current from the high-voltage
output will flow through any available ground path.
Rules
Operators should be thoroughly trained to follow all of the aforementioned rules, in addition to
any other applicable safety rules and procedures. Defeating any safety system should be
considered a serious offense with severe penalties such as removal from the Hipot testing job.
Allowing unauthorized personnel in the area during a test should also be dealt with as a
serious offense.
Dress
Operators should not wear jewelry that could accidentally complete a circuit.
Medical Restrictions
Personnel with heart ailments or devices such as pacemakers should be informed that the
voltages and currents generated by the instrument are very dangerous. If contacted it may
cause heart-related problems that a person of good health may not experience. Please have
the test operator consult their physician for recommendations.
1.3.4 Instrument Connections
WARNING

6
Never perform a hipot test on energized circuitry or equipment.
The instrument is equipped with a safety ground connection, be sure that this is connected to a
good earth ground.
Always connect the return lead first, regardless of whether the item under test is a sample of
insulating material, a component tested with the high voltage test lead, or a cord-connected
device with a two or three prong plug. The return lead should be connected first for any type
of hipot testing.
Plug in the high voltage test lead only when it is being used. Handle its clip only by the
insulator---never touch the clip directly. Be certain that the operator has control over any
remote test switches connected to the Hipot. Double check the return and high voltage
connections from the Hipot and the Line, Neutral, Ground and Case connections from the
Touch Current tester to be certain that they are proper and secure.
Device Under Test
Never touch the Device Under Test (DUT) or anything connected to it while
high voltage is being applied by the hipot.
When testing with DC, always discharge the capacitance of the item under test and anything
the high voltage may have contacted--such as test fixtures--before handling it or disconnecting
the test leads.
HOT STICK probes can be used to discharge any capacitance in the device under test as a
further safety precaution. A hot stick is a non-conducting rod about two feet long with a
metal probe at the end that is connected to a wire. To discharge the device under test, two hot
sticks are required. First, connect both probe wires to a good earth ground. Then touch one
probe tip to the same place that the return lead was connected. While holding the first probe
in place, touch the second probe tip to the same place where the high voltage lead was
connected.
1.3.5 Key Safety Points to Remember
•Keep unqualified and unauthorized personnel away from the test area.
•Arrange the test station in a safe and orderly manner.
•Never touch the product or connections during a test.
•In case of any problem, turn off the high voltage first.
•Properly discharge any item tested with DC before touching connections.
WARNING

7
1.4 Introduction to Product Safety Testing
The Importance of Safety Testing
Product Safety Tests are specified during the design and development stages of a product as
well as in the production of the products to insure that it meets basic safety requirements.
These tests are designed to verify the safety of the electrical products in that they do not
jeopardize the safety of the people, domestic animals, and property of anyone who may come
in contact with these products. In an era of soaring liability costs, original manufacturers of
electrical and electronic products must make sure every item is as safe as possible. All
products must be designed and built to prevent electric shock, even when users abuse the
equipment or by-pass built in safety features.
To meet recognized safety standards, one common test is the "dielectric voltage-withstand
test". Safety agencies which require compliance safety testing at both the initial product
design stage and for routine production line testing include: Underwriters Laboratories, Inc.
(UL), the Canadian Standards Association (CSA), the International Electrotechnical
Commission (IEC), the British Standards Institution (BSI), the Association of German
Electrical Engineers (VDE) and (TÜV), the Japanese Standards Association (JSI). These
same agencies may also require that an insulation resistance test and high current ground bond
test be performed.
1.5 Safety Test
1.5.1 Dielectric Withstand Voltage Test
The principle behind a dielectric voltage - withstand test is simple. If a product will function
when exposed to extremely adverse conditions, it can be assumed that the product will
function in normal operating circumstances.
Common Applications of the Dielectric Withstand Test:
•Design (performance) testing: Determining design adequacy to meet service conditions.
•Production Line testing: Detecting defects in material or workmanship during processing.
•Acceptance testing: Proving minimum insulation requirements of purchased parts.
•Repair Service testing: Determine reliability and safety of equipment repairs.
The specific technique used to apply the dielectric voltage - withstand test to each product is
different. During a dielectric voltage - withstand test, an electrical device is exposed to a
voltage significantly higher than it normally encounters, for a specified duration of time.
During the test, all current flow from the high voltage output to the return is measured. If,
during the time the component is tested, the current flow remains within specified limits, the
device is assumed safe under normal conditions. The basic product design and use of the
insulating material will protect the user against electrical shock.

8
The equipment used for this test, a dielectric-withstand tester, is often called a "hipot" (for
high potential tester). The "rule of thumb" for testing is to subject the product to twice its
normal operating voltage, plus 1,000 volts.
However, specific products may be tested at much higher voltages than 2X operating voltages
+ 1,000 volts. For example, a product designed to operate in the range between 100 to 240
volts can be tested between 1,000 to 4,000 volts or higher. Most "double insulated" products
are tested at voltages much higher than the "rule of thumb".
Testing during development and prototype stages is more stringent than production run tests
because the basic design of the product is being evaluated. Design tests usually are
performed on only a few samples of the product. Production tests are performed on every
item as it comes off the production line.
The hipot tester must also maintain an output voltage between 100% and 120% of
specification. The output voltage of the hipot must have a sinusoidal waveform with a
frequency between 40 to 70 Hz and has a peak waveform value that is not less than 1.3 and not
more than 1.5 times the root-mean-square value.
Types of Failures only detectable with a Hipot test
•Weak Insulating Materials
•Pinholes in Insulation
•Inadequate Spacing of Components
•Pinched Insulation
1.5.1.1 AC Dielectric Withstand Test
Please check with the Compliance Agency you are working with to see which of the two types
of voltages you are authorized to use. In some cases, a Compliance Agency will allow either
AC or DC testing to be done. However, in other cases the Compliance Agency only allows
for an AC test.
Many safety agency specifications allow either AC or DC voltages to be used during the hipot
test. When this is the case, the manufacturer must make the decision on which type of
voltage to utilize. In order to do this it is important to understand the advantages and the
disadvantages of both AC and DC testing.
AC testing characteristics
Most items that are hipot tested have some amount of distributed capacitance. An AC
voltage cannot charge this capacitance so it continually reads the reactive current that flows
when AC is applied to a capacitive load.

9
AC testing advantages
1. AC testing is generally much more accepted by safety agencies than DC testing. The main
reason for this is that most items being hipot tested will operate on AC voltages. AC hipot
testing offers the advantage of stressing the insulation alternately in both polarities, which
more closely simulates stresses the product will see in real use.
2. Since AC testing cannot charge a capacitive load the current reading remains consistent
from initial application of the voltage to the end of the test. Therefore, there is no need to
gradually bring up the voltage since there is no stabilization required to monitor the current
reading. This means that unless the product is sensitive to a sudden application of voltage
the operator can immediately apply full voltage and read current without any wait time.
Another advantage of AC testing is that since AC voltage cannot charge a load there is no need
to discharge the item under test after the test.
AC testing disadvantages
One disadvantage of AC testing surfaces when testing capacitive products. Again, since AC
cannot charge the item under test, reactive current is constantly flowing. In many cases, the
reactive component of the current can be much greater than the real component due to actual
leakage. This can make it very difficult to detect products that have excessively high leakage
current.
Another disadvantage of AC testing is that the hipot has to have the capability of supplying
reactive and leakage current continuously. This may require a current output that is actually
much higher than is really required to monitor leakage current and in most cases is usually
much higher than would be needed with DC testing. This can present increased safety risks
as operators are exposed to higher currents.
1.5.1.2 DC Dielectric Withstand Test
DC testing characteristics
During DC hipot testing the item under test is charged. The same test item capacitance that
causes reactive current in AC testing results in initial charging current which exponentially
drops to zero in DC testing.
DC testing advantages
Once the item under test is fully charged, the only current flowing is true leakage current.
This allows a DC hipot tester to clearly display only the true leakage of the product under test.
Another advantage to DC testing is that the charging current only needs to be applied
momentarily. This means that the output power requirements of the DC hipot tester can

10
typically be much less than what would be required in an AC tester to test the same product.
DC testing disadvantages
1. Unless the item being tested has virtually no capacitance, it is necessary to raise the voltage
gradually from zero to the full test voltage. The more capacitive the item the more slowly
the voltage must be raised. This is important since most DC hipots have failure shut off
circuitry which will indicate failure almost immediately if the total current reaches the
leakage threshold during the initial charging of the product under test.
2. Since a DC hipot does charge the item under test, it becomes necessary to discharge the
item after the test.
3. DC testing unlike AC testing only charges the insulation in one polarity. This becomes a
concern when testing products that will actually be used at AC voltages. This is an
important reason that some safety agencies do not accept DC testing as an alternative to AC.
4. When performing AC hipot tests the product under test is actually tested with peak voltages
that the hipot meter does not display. This is not the case with DC testing since a sinewave
is not generated when testing with direct current. In order to compensate for this most
safety agencies require that the equivalent DC test be performed at higher voltages than the
AC test. The multiplying factor is somewhat inconsistent between agencies which can
cause confusion concerning exactly what equivalent DC test voltage is appropriate.
1.5.2 Insulation Resistance Test
Some "dielectric analyzers today come with a built in insulation resistance tester. Typically,
the IR function provides test voltages from 500 to 1,000 volts DC and resistance ranges from
kilohms to gigaohms. This function allows manufacturers to comply with special
compliance regulations. BABT, TÜV and VDE are agencies that may under certain
conditions, require an IR test on the product before a Hipot test is performed. This typically
is not a production line test but a performance design test.
The insulation resistance test is very similar to the hipot test. Instead of the go/no go
indication that you get with a hipot test the IR test gives you an insulation value usually in
Megohms. Typically, the higher the insulation resistance value the better the condition of the
insulation. The connections to perform the IR test are the same as the hipot test. The
measured value represents the equivalent resistance of all the insulation which exists between
the two points and any component resistance which might also be connected between the two
points.
Although the IR test can be a predictor of insulation condition it does not replace the need to
perform a dielectric withstand test.

11
1.5.3 Ground Continuity Test or Ground Bond Test
The Ground Bonding test determines whether the safety ground circuit of the product under
test can adequately handle fault current if the product should ever become defective. A low
impedance ground system is critical in ensuring that in case of a product failure, a circuit
breaker on the input line will act quickly to protect the user from any serious electrical shock.
International compliance agencies such as CSA, IEC, TÜV, VDE, BABT and others, have
requirements calling out this test. This test should not be confused with low current
continuity tests that are also commonly called out in some safety agency specifications. A
low current test merely indicates that there is a safety ground connection. It does not
completely test the integrity of that connection.
Compliance agency requirements vary on how different products are to be tested. Most
specifications call for test currents of between 10 and 40 amps. Test voltages at these
currents are typically required to be less than 12 volts. Maximum allowable resistance
readings of the safety ground circuit are normally between 100 and 200 milliohms.
If you are testing a product that is terminated in a three-prong plug, you are required to
perform a continuity or ground bond test on the ground conductor to the chassis or dead metal
of the product.
1.5.4 RUN Test
All manufacturers of a product that runs on line power normally need to run the DUT (Device
Under Test) after final safety testing so that they can verify the functionality of their products.
In addition to running the DUT to test its basic functionality many customers also require
some basic test data to be recorded while the DUT is powered up. A Run Test System allows
the product to be powered up immediately after the safety tests are completed with a single
connection to the DUT. Measurements that are commonly made while the DUT is running
can include Amperage, Voltage, Watts and Power Factor.
1.5.5 Touch Current Test
The Touch Current test is one of many product safety tests that are normally specified for
electrical products by safety testing agencies such as Underwriters Laboratories (UL) and the
International Electrotechnical Committee (IEC). The Touch Current specifications vary as
well as the method in which the measurements are taken depending upon the application or
function of a product and the standard to which the product is being tested.
Current Leakage or Touch Current tests are general terms that actually describe three
different types of tests. These tests are Earth Leakage Current, Enclosure Leakage Current,
and Applied Part Leakage Current. The main differences in these tests are in the placement
of the probe for the measuring device. The Earth Leakage Current is the leakage current that
flows through the ground conductor in the line cord back to earth. The Enclosure Leakage

12
Current is the current that flows from any enclosure part through a person back to ground if it
were contacted by a person. The Applied Part Leakage Current or Patient Lead Leakage
Current is any leakage that flows from an applied part, between applied parts or into an
applied part. The Applied Part Leakage Current test is required only for medical equipment.
All of these tests are used to determine if products can be safely operated or handled without
posing a shock hazard to the user.
Touch Current Testers provide the capability of meeting the Touch Current test specified in
the following standards; UL 544, IEC 950, UL 1950, IEC 601-1, UL 2601, UL 1563, UL 3101,
IEC 1010 and others. The Touch Current test, is a test which measures the leakage current
of a product, through a circuit that is designed to simulate the impedance of the human body.
The simulation circuit is called the Measuring Device (MD). The instrument has five
different MD circuits, selectable through the menu, which are representative circuits designed
to simulate the impedance of the human body under different conditions. The impedance of
the human body will vary depending upon point of contact, the surface area of the contact
and the path the current flows. For these reasons, the specifications of the Measuring
Devices are different depending upon the type of test being performed as well as the maximum
allowable leakage current. Leakage current measurements are performed on products under
normal conditions and single fault conditions as well as reversed polarity. This simulates
possible problems, which could occur if the product under test is faulted or misused while the
product is operating under high line conditions (110% of the highest input voltage rating of the
product).
Touch Current tests are normally specified as “Type Tests” or “Design Tests” which are
performed during the development of the product. This helps verify that the design is safe
but it does not guarantee the safety of the products being produced on the production line.
The only way to be sure you are shipping safe products is to test each product at the end of the
production line. The user may perform a Leakage Current test along with other common
safety test such as Dielectric Withstand, Insulation Resistance, and Ground Bond on the
production line with a single connection to the device under test.

13
2. Getting Started
This section contains information for the unpacking, inspection, preparation for use and
storage of your EXTECH Electronics Co., Ltd. product.
2.1 Unpacking and Inspection
Packaging
Your instrument was shipped in a custom foam insulated container that complies with ASTM
D4169-92a Assurance Level II Distribution Cycle 13 Performance Test Sequence
If the shipping carton is damaged, inspect the contents for visible damage such as dents,
scratches or broken display. If the instrument is damaged, notify the carrier and EXTECH's
customer support department. Please save the shipping carton and packing material for the
carriers inspection. Our customer support department will assist you in the repair or
replacement of your instrument. Please do not return your product without first notifying us .
Please retain all of the original packaging materials.
Contents of the Carton
Inside the carton should be the following:
Description Part No.
7630
Operation Manual
Fuse *1 F2A-2S
10A Power Cord *1 WC-10-YP03
Interlock Key 2-KEY-02-A00 (Please install the
interlock key in the rear panel
before instrument has been used.)
DUT Input Power Lead *1 1151
40A DUT Power Cable *1
(For 7630 without OPT. 753)
1148
Hipot Return Lead *2
(For 7630 without OPT. 753)
1102
OPT.753 HV & GB Link Module
TC Receptacle Adaptor Box *1 1932
Hipot Link Lead *1 1105
DUT Power & HV Cable 40A / 4KV *1 1149
Hipot Test Lead *2 1101
Y type terminal 3-TM-5.5-6-Y
Insulating sleeve (Black sleeve*1 & Green sleev *1) 3-V-5.5B, 3-V-5.5R
1931 & 1931S Series Transformer Box
RS485 cable 1220

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Returning the Instrument
When it is necessary to return the instrument for servicing or calibration, repackage the
instrument in its original container, please include all accessories and test leads. Indicate the
nature of the problem or type of service needed. Also, please mark the container
"FRAGILE" to insure proper handling.
If you do not have the original packaging materials, please follow these guidelines:
•Wrap the instrument in a bubble pack or similar foam. Enclose the same information as
above.
•Use a strong double-wall container that is made for shipping instrumentation. 350 lb. test
material is adequate.
•Use a layer of shock-absorbing material 70 to 100 mm (3 to 4 inch) thick around all sides
of the instrument. Protect the control panel with cardboard.
•Seal the container securely.
•Mark the container "FRAGILE" to insure proper handling.
2.2 Installation
2.2.1 Power Requirements
This instrument requires a power source of either 115 volts AC ± 15%, 47~63 Hz single phase
or 230 volts AC ±15%, 47~63 Hz single phase. Please check the rear panel to be sure the
proper switch setting is selected for your line voltage requirements before turning your
instrument on. AT the same time, please must use the sure fuse for the instrument. It’s
specification is marked in rear panel of instrument. Please must turn off input power to avoid
dangerous before replace the fuse.
Do not switch the line voltage selector switch located on the rear panel while
the instrument is on or operating. This may cause internal damage and
represents a safety risk to the operator.
2.2.2 Basic Connections
Power Cable
Before connecting power to this instrument, the protective ground (Earth)
terminals of this instrument must be connected to the protective conductor of
the line (mains) power cord. The main plug shall only be inserted in a socket outlet
(receptacle) provided with a protective ground (earth) contact. This protective ground (earth)
must not be defeated by the use of an extension cord without a protective conductor
(grounding).
The instrument is shipped with a three-wire power cable. When the cable is connected to an
CAUTION
WARNING