High Withstand Voltage Tester Operation Manual

High Withstand Voltage Tester Operation Manual
High Withstand Voltage Tester
MODEL 7470 (10KV AC ONLY HIPOT)
MODEL 7472 (12KV DC ONLY HIPOT)
MODEL 7473 (20KV AC ONLY HIPOT)
MODEL 7474 (20KV DC ONLY HIPOT)
Operation Manual
EXTECH Electronics Co., Ltd.
PHONE: 886-26943030
FAX: 886-26947575
4F, NO.252,Nan Yang Street, Shih Chih City,
Taipei Hsien,221 Taiwan.
Website: http://www.extech-electronics.com
Printed in Jan.2006
EV 1.01
CONTENT
1. INTRODUCTION .................................................................................................................... 1
1.1. Warranty Policies ..................................................................................................................... 1
1.2. Safety Symbols......................................................................................................................... 2
1.3. Glossary of Terms (As used in this manual) ............................................................................ 3
1.4. Safety........................................................................................................................................ 4
1.5. Introduction to Product Safety Testing .................................................................................... 7
1.6. The Different Types of Safety Tests ........................................................................................ 8
1.7. Key Features and Benefits:..................................................................................................... 13
2. GETTING STARTED........................................................................................................... 15
2.1. Unpacking and Inspection ...................................................................................................... 15
2.2 .Installation .............................................................................................................................. 16
3. SPECIFICATIONS AND CONTROLS .............................................................................. 18
3.1. Functional Specifications ....................................................................................................... 18
3.2. Instrument Controls................................................................................................................ 23
3.3. Quickstart ............................................................................................................................... 26
4. SYSTEM SETTINGS............................................................................................................ 28
4.1. SETUP Key Parameters ......................................................................................................... 28
4.2. LOCK/LOCAL Key ............................................................................................................... 31
4.3. Password Setting .................................................................................................................... 32
5. TEST PARAMETERS SETUP PROCEDURES................................................................ 33
5.1. Test Parameters ...................................................................................................................... 33
5.2. Setting Up Tests ..................................................................................................................... 34
5.3. Reviewing Test Results .......................................................................................................... 39
5.4. Default Test Parameters ......................................................................................................... 39
6. OPERATING INSTRUCTIONS.......................................................................................... 39
6.1. Preparation and Instrument Connections ............................................................................... 40
6.2. Power Up................................................................................................................................ 40
6.3. Settings Screen ....................................................................................................................... 40
6.4.. Metering ................................................................................................................................ 41
6.5. Performing a Test ................................................................................................................... 42
7. DISPLAYED MESSAGES ................................................................................................... 43
7.1. Running Test Messages all units ............................................................................................ 43
7.2. Additional Displayed messages for DC units......................................................................... 46
7.3. BUS Remote message ............................................................................................................ 46
7.4. Fatal Error............................................................................................................................... 47
7.5. Output Error ........................................................................................................................... 47
8. CONNECTION OF REMOTE I/O...................................................................................... 48
8.1. Signal Outputs on Remote I/O ............................................................................................... 48
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8.2. Signal Inputs of Remote I/O and Memory Access................................................................. 49
9. BUS REMOTE INTERFACE GPIB / RS-232 (OPTION) ................................................ 51
9.1. GPIB Messages ...................................................................................................................... 51
9.2. Functions ................................................................................................................................ 51
9.3. Signals and Lines.................................................................................................................... 51
9.4. GPIB Connector ..................................................................................................................... 51
9.5. GPIB Address......................................................................................................................... 52
9.6. Interface Functions ................................................................................................................. 52
9.7. RS-232 Interface..................................................................................................................... 52
9.8. GPIB / RS-232 Interface Command List ............................................................................... 53
9.9. Example of Communicating Over the GPIB Bus .................................................................. 54
9.10. Non Volatile Memory .......................................................................................................... 62
9.11. BUS Remote message .......................................................................................................... 62
10. OPTIONS ............................................................................................................................. 63
11. CALIBRATION PROCEDURE ........................................................................................ 66
11.1. Required Calibration Equipment.......................................................................................... 66
11.2. Calibration Initialization....................................................................................................... 66
11.3. Calibration Procedure........................................................................................................... 66
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1. Introduction
1.1. Warranty Policies
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 the National Institute of Standards Taiwan.
Your new instrument is warranted to be free from defects in workmanship and material for a
period of (1) year 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.
Follow below states, EXTECH will void your warranty.
· Operate under non-normal , contrived omission, or accidental calamity (including, temblor,
floods, rebellion, and fire etc.)
· Any non-authorized modifications, tampering or physical damage.
· Elimination of any connections in the earth grounding system or bypassing any safety
systems.
· Use of non-authorized parts in the repair of this instrument. Parts used must be parts that are
recommended by EXTECH as an acceptable specified part.
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.
EXTECH recommends that your instrument be calibrated on a twelve month cycle.
1
1.2. Safety Symbols
1.2.1. Product Marking 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.
1.2.2. Caution and Warning Symbols
WARNING
Calls attention to a procedure, practice, or condition that could possibly cause
bodily injury or death.
CAUTION
Calls attention to a procedure, practice, or condition that could possibly cause
damage to equipment or permanent loss of data
2
1.3. 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.
measuring up to 200 megohms.
Usually employs a higher voltage power supply than used in ohmmeters
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 is 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
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1.4. 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 verify that the instrument is set to the correct line voltage (115 or 230)
and the correct fuse is installed.
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.
WARNING
1.4.1. 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..
Service Interval
The instrument, its power cord, test leads, and accessories must be returned at least once a year
to an Extech authorized service center for calibration and inspection of safety related
components. Extech will not be held liable for injuries suffered if the instrument is not
properly maintained and safety checked annually.
User Modifications
Unauthorized user modifications will void your warranty. Extech will not be responsible for
any injuries sustained due to unauthorized equipment modifications or use of parts not
specified by Extech. Instruments returned to Extech with unsafe modifications will be
returned to their original operating condition at the customers expense.
1.4.2. 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.
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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.”
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
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.
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.
1.4.3. 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.
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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.
1.4.4. Instrument Connections
WARNING
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 Line
Leakage tester to be certain that they are proper and secure.
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1.4.5. Device Under Test
WARNING
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.
1.4.6. 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.
1.5. Introduction to Product Safety Testing
1.5.1. 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.
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1.6. The Different Types of Safety Tests
1.6.1. Dielectric Withstand 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.
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.
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Types of Failures only detectable with a Hipot test
•
•
•
•
Weak Insulating Materials
Pinholes in Insulation
Inadequate Spacing of Components
Pinched Insulation
Dielectric Withstand Test; AC verses DC
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.
AC testing advantages
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.
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
9
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.
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
typically be much less than what would be required in an AC tester to test the same product.
DC testing disadvantages
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.
Since a DC hipot does charge the item under test, it becomes necessary to discharge the item
after the test.
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.
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.
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1.6.2. 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.
1.6.3. 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 30 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.
1.6.4. 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.
11
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.
1.6.5. Line Leakage Test
The Line Leakage 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 line leakage 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 Line Leakage 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 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.
Line Leakage Testers provide the capability of meeting the line leakage 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 Line Leakage 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).
Line Leakage 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.
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1.7. Key Features and Benefits:
Patented SmartGFI®
The SmartGFI provides maximum operator protection.
If the circuit detects excessive leakage to ground it
shuts down the high voltage in less than 1 millisecond.
SmartGFI is automatically activated if the DUT is not
grounded. The operator does not need to make the
decision whether to activate the SmartGFI.
Storage of up to 50 setups
A real benefit for manufacturers that test different
products. The instrument can store 50 individual
memories that may be performed individually or
connected for a 50-step test.
RS-232 or GPIB interfaces
All the functions of the instruments can be
programmed over a RS-232, GPIB or printer interface
which makes them adaptable to any automated
production environment.
Line and Load regulation
Maintains the output voltage to within 1% of setting
even if the load or the line voltage varies. This
ensures that the test results remain consistent and
within safety agency requirements.
Digitally controlled arc detection
system
Allows the operator to select whether low-level arcs
should be detected and provides the operator with the
ability to digitally select and program multiple
sensitivity levels.
No load setup of trip current and This provides the operator with an easy and safe way to
set trip currents and output voltages since parameters
output voltage
are set without the high voltage activated.
TUV & UL listing
This assures you that this instrument meets or exceeds
safety requirements to ensure operator safety.
Autoware ® software control
High Withstand Voltage Tester may also be controlled
through Extech’s stand alone automation software.
This allows manufacturers to use the High Withstand
Voltage Tester in an automated environment without
writing their own software. Manufacturers can
capture, store and analyze relevant test data.
Automatic storage of test
program
High Withstand Voltage Tester powers up with the
parameters that were used during the last test to avoid
operator set-up errors.
All parameters for the setups
can be adjusted through a
simple menu driven program
Tamper proof front panel
controls
The easy to follow setup screens ensure that the
operator correctly sets up all test parameters
This makes it possible to limit user access to the setup
screens so that only authorized personnel with a
security code can change test parameters.
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Electronic dwell settings
The electronic dwell control helps keep test results
consistent by ensuring that the test duration is the same
for each product tested.
PLC remote inputs and outputs
The standard 9 pin interfaces provide outputs for Pass,
Fail, and Test in Process. Inputs include Test,
Interlock and Reset. Remote recall of memory program
#1, #2 and #3. This gives the user all the basic remotes
required to configure the High Withstand Voltage
Tester through simple PLC relay control.
Software calibration control
High Withstand Voltage Tester is calibrated through the
front panel keypad. All calibration information is
stored in non-volatile memory This allows High
Withstand Voltage Tester to be completely calibrated
without removing any covers and exposing the
technician to hazardous voltages.
User selectable output voltage
frequencies of 50 or 60 hertz
High Withstand Voltage Tester was designed for the
global market. This feature makes it simple for the
user to select the output frequency in the AC hipot
mode so that products can be tested at the same
frequency they will be used at.
Output voltage fine adjustment
To make High Withstand Voltage Tester usable in all
types of applications, the operator can manually bring
the voltage up or down in 10 volt increments by simply
pressing the up and down arrow keys. This makes it
very easy to adjust the output voltage even while High
Withstand Voltage Tester is in the dwell mode so you
can analyze test results at different voltages.
Flashing high voltage indicator
A flashing LED located directly over the high voltage
terminal clearly indicates when high voltage is active
to provide maximum operator safety.
User selectable input voltage
High Withstand Voltage Tester can be switched for
either 115 or 230 volt input operation through an easy
access rear panel mounted switch to allow it to be used
in any country.
Low-current sense
Monitors the minimum level of current flow, thus
ensuring that the DUT is properly connected and that
the hipot test is being performed.
Electronic ramping (up & down)
Provides a gradual and timed method to increase or
decrease output voltage to the DUT minimizing any
damage from quick high voltage changes to sensitive
DUTs.
14
2. Getting Started
Introduction
This section contains information for the unpacking, inspection, preparation for use and storage
of your Extech Electronics Ltd., Co. product.
2.1. Unpacking and Inspection
2.1.1. 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
carrier’s 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.
2.1.2. 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.
above.
•
Use a strong double-wall container that is made for shipping instrumentation.
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.
Enclose the same information as
350-lb. test
15
2.2. Installation
2.2.1. Work Area
Locate a suitable testing area and be sure you have read all safety instructions
WARNING for the operation of the instrument and suggestions on the test area set-up in
the Safety section. Make sure the work area you choose has a three-prong
grounded outlet. Be sure the outlet has been tested for proper wiring before connecting the
instrument to it.
2.2.2. Power Requirements
This instrument requires a power source of either 115 volts AC ± 15%, 50/60 Hz single phase
or 230 volts AC ±15%, 50/60 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. For operation at 115 and 230 Volts AC use a 6.3 Amp, Slo-Blo 250VAC.
CAUTION
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.
2.2.3. 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).
WARNING
The instrument is shipped with a three-wire power cable. When the cable is connected to an
appropriate AC power source, the cable will connect the chassis to earth ground. The type of
power cable shipped with each instrument depends on the country of destination.
CAUTION
The output power supplies of this instrument are referenced directly to earth
ground. Any conductor that completes a path between the high voltage and
earth ground will form a completed circuit.
Return Connection
When the instrument Return is grounded, any internal and external stray leakage will be
monitored due to currents that flow from High Voltage to earth ground (such as from HV to the
chassis of the instrument). This current is inherent and will cause errors when trying to
monitor very low leakage currents in the micoamp range.
2.2.4. Environmental Conditions
This equipment is intended for indoor use only.
This instrument may be operated in environments with the following limits:
Temperature….................. 32° - 104° F (0° - 40°C)
16
Relative humidity…...........20 – 80%
Altitude…......................... 6560 feet (2,000 meters)
Storage and Shipping Environment
This instrument may be stored or shipped in environments with the following limits:
Temperature….................. -40° - 131° F (-40° - 55°C)
Altitude…......................... 25,000 feet (7,620 meters)
The instrument should also be protected against temperature extremes that may cause
condensation within the instrument.
17
3. Specifications and Controls
3.1. Functional Specifications
3.1.1
7470 Functional Specifications
Output Rating
10KVAC/20mA
AC WITHSTAND VOLTAGE
Output Voltage, ACV
Range
Resolution
Accuracy
0 - 10000
10
±(2% of setting + 10V)
Output Frequency
50Hz/60Hz ±100ppm, User Selection
Output Waveform
Sine Wave ,THD.<2% (Resistive Load), Crest Factor = 1.3 - 1.5
Output Regulation
± (1% of
output + 10V), From no load to full load
SETTINGS
Hi / Lo -Limit AC Current, mA
Ramp Up Time, second
Ramp Down Time, second
0 - 9.999/10.00 - 20.00
0.001/0.01 ±(2% of setting + 2counts)
0.1 - 999.9
0.1
Cycle Test
0.0 - 999.9
0, 0.3 - 999.9 sec
(0=continuous)
0, 0.1 - 999.9 min
(0=continuous)
0, 0.1 - 999.9 hr
(0=continuous)
0 - 9999 Times, (0=continuous)
Arc Detection
1 - 9 ranges ( 9 is the most sensitivity)
AC Current Offset, mA
0 - 2.000 or Auto Set ( Option )
Dwell Time
0.1
0.1
±((0.1% + 0.05sec)
0.1
0.1
MEASUREMENT
AC Voltage, KV
AC Current Range, mA
18
0 - 10.00
0.01
0-3.500
0.001
3.00-20.00
0.01
±(2% of reading + 2counts)
±(2% of reading + 3counts)
3.1.2
7472 Functional Specifications
Output Rating
12KVDC/10mA
DC WITHSTAND VOLTAGE
Output Voltage, DCV
Output Ripple
0 - 12000
10
±(2% of setting + 10V)
<5%(12KV/9999µA at Resistive Load)
SETTINGS
Hi / Lo -Limit DC Current, µA
Ramp Up Time, second
Ramp Down Time, second
0.0 - 999.9/1000 - 9999
0.4 - 999.9
0.1/1
0.1
Cycle Test
0.0,1.0 - 999.9
0.1
0, 0.4 - 999.9 sec
0.1
(0=continuous)
0, 0.1 - 999.9 min
0.1
(0=continuous)
0, 0.1 - 999.9 hr
0.1
(0=continuous)
0 - 9999 Times, (0=continuous)
Arc Detection
1 - 9 ranges ( 9 is the most sensitivity)
DC Current Offset, µA
0.0 - 200.0 or Auto Set
Ramp High Current
ON/OFF, User Selection
Charge - Low Current, µA
0.0 - 350.0 or Auto Set
Dwell Time
Discharge Time
Maximum Capacitive Load
±(2% of setting + 2counts)
±(0.1% + 0.05sec)
(Option )
< 200 msec
1.5uF < 2KV
0.28uF < 4KV
0.18uF < 6KV
0.15uF < 8KV
0.15uF < 10KV
0.12uF
< 12KV
MEASUREMENT
DC Voltage, KV
DC Current Range, µA
0 - 10.00
0.01
0-350.0
0.1
300-3500
1
3000-9999
10
±(1.5% of reading + 2counts)
± (2% of reading + 3counts)
19
3.1.3
7473 Functional Specifications
Output Rating
20KVAC/10mA
AC WITHSTAND VOLTAGE
Output Voltage, ACV
Range
Resolution
Accuracy
0 - 20000
10
±(2% of setting + 20V)
Output Frequency
50Hz/60Hz ±100ppm, User Selection
Output Waveform
Sine Wave ,THD.<2% (Resistive Load), Crest Factor = 1.3 - 1.5
Output Regulation
± (1% of
SETTINGS
Hi / Lo -Limit AC Current, mA
(7473 ONLY)
Ramp Up Time, second
Ramp Down Time, second
Dwell Time
Cycle Test
Arc Detection
AC Current Offset, mA
output + 10V), From no load to full load
0 - 9.999
0.001
0.1 - 999.9
0.1
±(2% of setting + 2counts)
0.0 - 999.9
0.1
0, 0.3 - 999.9 sec
0.1
(0=continuous)
±((0.1% + 0.05sec)
0, 0.1 - 999.9 min
0.1
(0=continuous)
0, 0.1 - 999.9 hr
0.1
(0=continuous)
0 - 9999 Times, (0=continuous)
< 15KV , 1 - 9 ranges ( 9 is the most sensitivity)
≥15KV , 1 - 7 ranges ( 7 is the most sensitivity)
0 - 2.000 or Auto Set ( Option )
MEASUREMENT
AC Voltage, KV
AC Current Range, mA
20
0 - 20.00
0.01
0-3.500
0.001
3.00-10.00
0.01
±(2% of reading + 2counts)
±(2% of reading + 3counts)
3.1.4
7474 Functional Specifications
Output Rating
20KVDC/5mA
DC WITHSTAND VOLTAGE
Output Voltage, DCV
Output Ripple
0 - 20000
10
±(2% of setting + 20V)
<5%(20KV/5000µA at Resistive Load)
SETTINGS
Hi / Lo -Limit DC Current, µA
Ramp Up Time, second
Ramp Down Time, second
0.0 - 999.9/1000 - 5000
0.4 - 999.9
0.1/1
0.1
Cycle Test
0.0,1.0 - 999.9
0.1
0, 0.4 - 999.9 sec
0.1
(0=continuous)
0, 0.1 - 999.9 min
0.1
(0=continuous)
0, 0.1 - 999.9 hr
0.1
(0=continuous)
0 - 9999 Times, (0=continuous)
Arc Detection
1 - 9 ranges ( 9 is the most sensitivity)
DC Current Offset, µA
0.0 - 200.0 or Auto Set
Ramp High Current
ON/OFF, User Selection
Charge - Low Current, µA
0.0 - 350.0 or Auto Set
Dwell Time
Discharge Time
Maximum Capacitive Load
±(2% of setting + 2counts)
±(0.1% + 0.05sec)
(Option )
< 200 msec
1.5uF < 2KV
0.28uF < 4KV
0.18uF < 6KV
0.15uF < 8KV
0.15uF < 10KV
0.12uF
0.12uF
0.10uF
0.08uF
0.08uF
< 12KV
< 14KV
< 16KV
< 18KV
< 20KV
MEASUREMENT
DC Voltage, KV
DC Current Range, µA
0 - 20.00
0.01
0-350.0
0.1
300-3500
1
3000-5000
1
±(1.5% of reading + 2counts)
± (2% of reading + 3counts)
21
3.1.5
General Specifications
MODEL
7470
7472
7473
7474
GENERAL
Input Voltage AC
PLC Remote Control
115/230VAC ± 15% , 50/60Hz ± 5% Fuse: 6.3A Slow
Input : Test , Reset , Memory1.2.3 ,Interlock
Output : Pass , Fail , Processing
Safety
Smart-GFI Function (<1mA)
Memory
50 memories
Display
20*2 LCD with back light
Key Lock
To prevent unauthorized alteration of the test Parameters
Calibration
Build-in software and external calibrated meters
Interface
RS232/GPIB /Printer Card (Option)
Alarm Volume Setting
10 ranges set by the numeric keys on the front panel
Environment
0-40℃, 20-80%RH
Dimension, mm (W×H×D)
430×133×400
Net Weight
24Kg
22.5Kg
24Kg
23Kg
STANDARD ACCESSORIES
Power Cord(10A)
×1
Fuse
×2 (Include a spare contained in the fuse holder)
Interlock Disable Key(1505)
×1
×1
×1
×1
×1
Hipot Test Lead, 1.5m(1142)
-
-
×1
×1
Hipot Test Lead, 1.5m(1143)
×1
×1
-
-
Hipot Return Lead, 1.8m(1144)
22
3.2 Instrument Controls
3.2.1
Front Panel Controls
1 2 3
4
5 6
7 8
9
10
11
12
13
14
1. POWER SWITCH: Rocker style power switch with international ON ( | ) and OFF (0)
markings.
2. RESET BUTTON: Momentary contact switch used to reset the instrument. If a failure
condition occurs during a test, you will need to reset the system to shut off the alarm and
signal the system that you are aware of a failure condition. The reset button must be
pressed before you can proceed to the next test or change any of the set-up parameters.
This switch also serves as an abort signal to stop any test in progress controlled by the High
Withstand Voltage Tester.
3. TEST BUTTON: Momentary contact switch used to start tests. Press the green button to
activate the test that is set up in the test buffer shown on the display.
4. MEMORY: Use this key to select one of the 50 memories to modify or run stored test
parameters.
5. LOCK/LOCAL: Use this key to select key lockout mode. A password may be used when
setup in the calibration mode. Use this key when you wish to go from the Remote
operation of the instrument to the Local mode.
6. UP-DOWN ARROW KEYS: Use these keys to enter and move through the function
parameter menu for test parameter setup.
7. SETUP: Use this key to enter the setup menu and view or change the display contrast,
alarm volume, and PLC remote settings.
8. EXIT: Use this key to exit any menu or to clear an unwanted entry in a parameter field.
9. LCD DISPLAY: The 2x20-character display indicates test function, memory location, test
parameter and failure type as well as test measurements during a test.
10. DATA ENTRY KEYS:
ENTER key.
Use these keys to input numeric parameters followed by the
23
1 2 3
11. ENTER:
4
5 6
7 8
9
10
11
12
13
14
Use this key as an ENTER key to accept numeric data for parameter settings.
12. HIGH VOLTAGE OUTPUT JACK: Connector used to attach the High Voltage test
lead or test fixture high voltage lead to the instrument. The connector is recessed for
safety when not being used.
13. RETURN OUTPUT JACK: Connector used to attach the Return test lead or test fixture
return lead to the instrument. This connection provides the return current path for the high
voltage.
14. HIGH VOLTAGE ON INDICATOR: This indicator flashes to warn the operator that
high voltage is present at the high voltage terminal.
24
3.2.2
Rear Panel Controls
1
2 3
6
7
1. CHASSIS GROUND (EARTH) TERMINAL:
good earth ground before operation.
5
4
8
9
This terminal should be connected to a
2. CALIBRATION BUTTON: To put the instrument into the calibration mode, push this
button and turn on the power switch simultaneously.
3. REMOTE SIGNAL INPUT: 9-Pin D subminiature male connector for remote control of
test, reset, and interlock functions, as well as remote program memory selection.
4. REMOTE SIGNAL OUTPUT: 9-Pin D sub-miniature female connector for monitoring
PASS, FAIL, and PROCESSING output relay signals.
5. BUS INTERFACE:
may be selected.
RS-232 Bus interface,l IEEE 488 interface and PRINTER interface
6. FUSE RECEPTACLE: To change the fuse, unplug the power (mains) cord and turn the
fuse receptacle counter-clockwise. The fuse compartment will be exposed. Please
replace the fuse with one of the proper rating.
7. INPUT POWER RECEPTACLE: Standard IEC 320 connector for connection to a
standard NEMA style line power (mains) cord.
8. INPUT POWER SWITCH: Line voltage selection is set by the position of the switch.
The left position is set for 115 volt operation; the right position is set for 230 volt operation.
9. THERMAL COOLING FAN:
Runs continuously to cool the instrument.
25
3.3 Quickstart
This quick start guide assumes the operator has some familiarity with automated Electrical
Safety testing.
Locate a suitable testing area and be sure you have read all safety instructions
for the operation of the instrument and suggestions on the test area set-up in
the Safety section. Locate a three prong grounded outlet. Be sure the outlet has been tested
for proper wiring before connecting the instrument to it.
WARNING
Check to be sure that the correct input line voltage has been selected on the
rear panel, either 115 volts AC or 230 volts AC. Connect the power-input
plug into its socket on the rear panel of the instrument. Connect the male
end of the plug to the outlet receptacle. Please be sure that the safety ground on the power
line cord is not defeated and that you are connecting to a grounded power source.
CAUTION
Turn on the POWER switch located on the lower left-hand side of the front panel. The
initialization screen will appear. The initialization screen will appear as follows:
EXTECH HIGH WITHSTAND
VOLTAGE TESTER
747X VER : X.XX
Note: X = Numeric.
After the initialization screen disappears, the Settings screen will be displayed.
screen will appear as follows:
M XX Set
XX.XX KV
The Settings
XXX.X s
X.XXX xA
The High Withstand Voltage Tester comes with all of the memories loaded with the withstand
default parameters. The initial test loaded for use is Memory 1. If this test is unacceptable
for your DUT then refer to the section 5. Test Parameters Setup Procedure, for instructions
on how to program tests into the instrument.
If these parameters are acceptable, then connect an appropriate set of test leads to the device
under test (DUT) or test fixture. Connect the return lead (Black alligator clip insulator) to the
DUT or test fixture then connect the high voltage output lead (Red alligator clip insulator).
Make sure the safety ground of this instrument is connected to a known good ground.
Refer to section 4.1.5 Smart GFI, for an explanation of DUT grounding configurations.
WARNING
DO NOT TOUCH THE DEVICE UNDER TEST, HIGH
VOLTAGE TEST LEAD, ALLIGATOR CLIP, OR CLIP
INSULATOR ONCE THE TEST HAS BEEN STARTED.
This instrument is supplied with a high voltage test lead terminated with an alligator clip.
This clip is designed to allow firm connection to the DUT without the need for an operator to
hold a probe or lead in place during the test. This clip and insulator will carry the voltage and
current of this tester but they are not intended to be held by the operator during the test while
26
the high voltage is energized. Please insure that you do not make contact with the alligator
clip or the clip insulator while high voltage is energized.
3.3.1.1
Remote Interlock
High Withstand Voltage Tester is equipped with a featured referred to as “Remote Interlock”.
Remote Interlock is a feature that utilizes a set of closed contacts to enable the instruments
output. In other words, if the Interlock contacts open, the output of the instrument will be
disabled. Remote Interlock could also be referred to as a remote system lockout, utilizing
“Fail When Open” logic. If the Interlock contacts are open and the Test button is pushed, a
pop-up message will be displayed on the screen for two seconds. The message will appear as
follows:
Interlock Is Open
If the Interlock contacts are opened during a test, the pop-up message will be displayed and the
test will abort. The hardware has been configured to provide the interlock connections on pins
4 and 5 of the Remote Interface, Signal Input port. The instrument can still be used without
the external interlock device as long as the Interlock Connector is plugged into the Remote
Interface, Signal Input port. If there is nothing connected to the Remote Interface, Signal
Input port to provide a connection to the interlock, the instrument will not perform tests.
Please check your connections to be sure they are making good contact. Clear the area of any
debris that may create a hazardous situation and ask any unnecessary personnel to leave the
area. To initiate the test, press the GREEN test button on the front panel. This is a
momentary button and does not need to be held in the pressed position during the test. The
instrument will then initiate the test presently loaded (in this case Memory 1).
If the DUT passes the test, you will hear a short audible beep. If a failure occurs, you will
hear a long audible alarm and the red failure indicator will light up. If a failure occurs during
the test, a continuous alarm will sound and the red indicator light in the RESET button will
illuminate.
To stop the alarm you must press the illuminated RED button marked “RESET”. This will
silence the alarm, clear the red fail light, and reset the instrument for the next test. The
RESET button may also be used to quickly ABORT a test and cut off the power to the DUT.
When a test is being performed, a red lightning bolt indicator located in the lower right side of
the front panel will illuminate and flash until the test is finished. If the DUT passed the test,
you will hear a brief beep indicating the DUT passed and that the tests are complete.
3.3.1.2
Reviewing Results
The method for reviewing test results is to press the ENTER key at the end of the test sequence.
Results can be reviewed at any time before the next test is executed by pressing the ENTER
key and then scrolling with the up and down arrow keys or repeatedly pressing the ENTER key.
The results of the last test in the process will be followed by the first test when scrolling
through the results. All buffers are cleared at the start of the next test cycle.
Pressing the EXIT key will return you to the Settings screen.
27
4. System Settings
4.1. SETUP Key Parameters
At the Setting, Pass, or Fail screen press the SETUP key. Use the SETUP key to progress
through the menu of System Parameters. Successive key presses will advance the menu
forward. The sequential forward menu items are: PLC Remote, Fail Stop, Contrast, Alarm,
Smart GFI, GPIB address, BUS Remote Command Set, Memory Lock. The setting of system
parameters affect the operating conditions of the instrument and are separate from the
functional settings. The system settings are also global and are not specific to any memory
location.
4.1.1. PLC Remote
Press the SETUP key to advance to the PLC Remote parameter.
PLC Remote =
ON
<ENTER> to Select
or
The display will show:
PLC Remote =
<ENTER> to Select
OFF
Use the ENTER key to select the mode PLC Remote Control.
If the Remote Control is set to ON, the test function will be controlled by the Remote Control
via the remote connectors located on the rear panel. The TEST button on the front panel is
disabled but the RESET button is still enabled.
The remote Memory Program recall functions can be performed only when the PLC Remote is
set ON. In addition, when the PLC remote is set to ON, the remote TEST signal input is
active while in the Bus Remote Mode.
If the Remote Control is set to OFF, the operation of the instrument will be controlled by the
local TEST and RESET buttons on the front panel.
After selecting PLC Remote mode, press the SETUP key to advance to the Fail Stop setting.
Press the EXIT key to exit from the PLC Remote selection to the operation mode. The
instrument will store the PLC Remote selection automatically.
4.1.2. Fail Stop
Press the SETUP key to advance the menu to the Fail Stop parameter.
Fail Stop =
ON
<ENTER> to Select
or
The display will show:
Fail Stop =
OFF
<ENTER> to Select
Use the ENTER key to toggle the Fail Stop ON and OFF.
This mode allows the instrument to be setup to continue testing after detecting a failure, Fail
Stop = OFF.
If the Fail stop is off and a failure occurs during the test sequence, the RESET button will light
and a short alarm will sound but the sequence will continue to the end. At the end of the test
28
sequence, the RESET button will light and alarm will sound indicating failure during the
sequence. Pressing the RESET button will silence the alarm and reset the instrument.
A display of the first eight connected memories PASS/FAIL results on items tested is provided
at the conclusion of the last connected memory.
The display will show the results of the eight memories as follows:
Test P F P F P F P F
Mem 22 23 24 25 26 27 28 29
The pass-fail status is indicated by the letter F (Fail) or P (Pass).
Toggle the Fail Stop function or press the SETUP key to forward to the LCD Contrast selection.
Press the EXIT key to return to the operation mode. The program will store the Fail Stop
setting automatically.
4.1.3. LCD Contrast
Press the SETUP key to advance the menu to the Contrast parameter.
Contrast
Range: 1 - 9
The display will show:
=
X
9=High
Use the Numeric keys to enter the LCD Contrast level, then press the ENTER key. The
program will change the LCD Contrast immediately when the ENTER key is pressed, so the
setting can be viewed.
The LCD Contrast level may be adjusted from 1 - 9.
is the highest contrast.
Level 1 is the lowest contrast and level 9
Change the LCD Contrast again or press the SETUP key to advance to the Alarm Volume
setting. Press the EXIT key to return to the operation mode. The program will store the
Contrast setting automatically.
4.1.4. Alarm Volume
Press the SETUP key to advance the menu to the Volume parameter.
Alarm
0-9
=
0=OFF
The display will show:
X
9=High
The Audible Alarm Volume range is from 0 - 9. Level 0 is used to disable the Audible Alarm.
Level 1 is the lowest volume and level 9 is the loudest.
Use the Numeric keys to enter the Audible Alarm level, then press the ENTER key. The
program will provide a sample sound for checking immediately when the ENTER key is
pressed.
Change the Volume again or press the SETUP key to forward to the Smart GFI selection.
29
Press the EXIT key to return to the operation mode.
setting automatically.
The program will store the Volume
4.1.5. Smart GFI
Press the SETUP key to advance the menu to the Smart GFI parameter. The display will
show:
Smart GFI
=
ON
<ENTER> to Select
or
Smart GFI
= OFF
<ENTER> to Select
Use the ENTER key to toggle the Smart GFI ON and OFF.
The High Voltage power supply of the instrument is internally referenced to earth ground.
The leakage current measuring circuits monitor only currents that flow through the Return lead.
Therefore, the possibility exists for current to flow directly from the High Voltage output to
earth ground that typically would not be monitored.
GFI is a circuit that monitors the current between the High Voltage output and earth ground.
The GFI’s main purpose is to protect the operator from prolonged exposure to High Voltage in
the case of an accidental contact with the High Voltage lead and earth ground. If the operator
accidentally touches the High Voltage lead and earth ground, the High Voltage will be shut off
immediately and the test will be aborted. If the GFI threshold is exceeded, the display will
indicate a GFI Fail.
Smart GFI allows the user to automatically configure the instruments return configuration.
When the Return lead is earth grounded, the GFI circuit is disabled and the instrument operates
in a grounded return mode of operation. Grounded Return allows the user to perform tests on
devices that have their chassis earth grounded by the test fixture or test environment. The
standard configuration of High Withstand Voltage Tester is a floating return connection that is
not directly connected to Earth ground. The standard configuration allows monitoring of very
low-level leakage current without internal or external stray earth ground leakage currents being
measured and thereby causing errors in the reading. Grounding the return will create some
amount of leakage current that is proportional to the High Voltage output and can cause small
amounts of error depending on the test voltage and physical environment.
Toggle the Smart GFI function or press the SETUP key to forward to the GPIB address
selection. Press the EXIT key to return to the operation mode. The program will store the
Smart GFI setting automatically.
4.1.6. GPIB Address
Only appears if the GPIB option 01 is installed
Press the SETUP key to advance the menu to the GPIB address parameter.
show:
GPIB addr
Range: 0-31
30
=
XX
The display will
Use the Numeric keys to enter the GPIB Address, then press the ENTER key.
Change the GPIB address again or press the SETUP key to advance to the Memory Lock
parameter. Press the EXIT key to return to the operation mode. The program will store the
GPIB address automatically.
4.1.7. BUS Remote Command Set
Will not appear if the Printer Card option 02 is installed
Press the SETUP key to advance the menu to the Command Set Format parameter.
display will show:
Command Set = 488.1
<ENTER> to Select
or
The
Command Set = 488.2
<ENTER> to Select
Use the ENTER key to toggle the remote command set between 488.1 and 488.2. Please refer
to section 9.Bus Remote Interface GPIB/RS232 for additional information about this
selection.
Change the BUS Remote Command Set again or press the SETUP key to advance to the
Memory Lock parameter. Press the EXIT key to return to the operation mode. The program
will store the BUS Remote Command Set automatically.
4.1.8. Memory Lock
Press the SETUP key to advance the menu to the Memory Lock parameter.
show:
Memory Lock = ON
<ENTER> to Select
or
The display will
Memory Lock = OFF
<ENTER> to Select
Use the ENTER key to toggle the Memory Lock ON and OFF.
Memory Lock is a sub-function of the Lock setting. In order for the Memory Lock function to
work, the Lock must first be turned ON. Selecting the Memory Lock OFF will allow the user
to access all available Memory locations but restricts access to memory editing capabilities.
Selecting the Memory Lock ON will allow the user to only run the currently loaded memory.
Toggle the Memory Lock function or press the SETUP key to forward to the PLC Remote
selection. Press the EXIT key to return to the operation mode. The program will store the
Memory Lock setting automatically.
4.2. LOCK/LOCAL Key
4.2.1. Lock Function
Press the LOCK/LOCAL key.
If the Password is enabled, the display will show:
Password = _ _ _ _
31
Range :
0-9999
Use the Numeric Key to enter the password and then press the ENTER key. The program will
switch the Key Lock function from LOCK to UNLOCK or UNLOCK to LOCK mode and
advance the program to Operation mode automatically. If the wrong password is entered, the
program will give a warning sound and the display will show:
Password = ERROR
Range : 0 - 9 9 9 9
And then the program will return to the original screen and wait to enter the new password.
the Password is disabled (Password is set “0”), the display will show:
Key Lock = O N
<ENTER> to Select
or
If
Key Lock = O F F
<ENTER> to Select
Use the ENTER key to select the Key Lock mode, and then press the EXIT key. The program
will switch the Key Lock function from LOCK to UNLOCK or UNLOCK to LOCK mode and
advance the program to the Operation mode automatically. If the Key Lock function is in the
Lock mode, the LOCK indicator on the front panel will light.
If the Memory Lock function is selected to ON, the Memory selection Menu will be disabled
when in the Lock Mode. If the Memory Lock is selected to OFF, the Memory selection Menu
will be enabled when in the Lock Mode. Different memories can be recalled but the test
parameters or steps cannot be changed.
Please refer to section 4.1.7, Memory Lock for instructions on this feature.
4.2.2. Local Function
Use this key when you wish to go from the Remote operation of the instrument to the Local
mode.
4.3. Password Setting
Press the “4” and “7” keys simultaneously and then turn the input power switch on. The
program will automatically enter to the Password Setting mode and the display screen will
show:
Password
=
Range : 0 - 9 9 9 9
0
or
Password
=
Range : 0 - 9 9 9 9
XXXX
The Password can be any four (4) digit number. If the Password is set to 0, the keyboard lock
out will be selected by the LOCK key on the front panel without a Password. The Password
default is preset to 0 at the factory.
32
5. Test Parameters Setup Procedures
5.1. Test Parameters
Description of Test Parameters
Voltage: The Voltage that is applied to the High Voltage and Return terminals or the Current
and Return terminals during a test.
HI-Limit: A maximum current or resistance threshold that when exceeded triggers a failure.
LO-Limit: A minimum current or resistance threshold that when not exceeded triggers a
failure.
Ramp-UP: A length of time that is allowed for the test voltage to climb from 0 to the voltage
set point.
Dwell Unit: Allows for the selection of seconds or minutes as the Dwell timers base unit.
Dwell: A length of time that is allowed for the set point voltage to be applied.
Ramp-DOWN: A length of time that is allowed for the test voltage to decay from set point to
zero.
Arc Detect: This function when turned on activates the Arc Detection threshold controlled by
the Arc Sense parameter.
Arc Sense: The numbers corresponding to the different arc sensitivity levels are 1 through 9, 1
meaning the maximum threshold of allowable arcing, 9 meaning the minimum threshold of
allowable arcing. During Hipot testing, some low current arcing may be allowable. Arc
sense is a maximum allowable threshold for arcing.
Frequency: This parameter is available in AC tests only and is selectable using the settings
menu between 50 and 60Hz.
Connect: This function when turned ON will connect or link the current memory to the next
memory. This function allows all 50-memory locations to be connected together.
Ramp-HI: Ramp-HI will allow current higher than the normal HI-Limit current setting of the
DC Withstand Voltage test, during the Ramp-Up time, to avoid false failure due to charging
current. Ramp-HI may be selected ON or OFF using a softkey. A description of how to
set up this parameter is given in the 5.2.11 Ramp-Hi selection section of this manual.
Charge–LO: The Charge-LO function is used to check if the cables are connected properly at
the beginning of a test. This function is only available in DC Withstand and Insulation
resistance testing. A description of how to set up this parameter is given in the 5.2.10
Charge-Lo setting section of this manual.
33
5.2. Setting Up Tests
Before going to setup the Test Parameters, make sure that the Keyboard is in the Unlock mode,
and then follow this procedure to setup the Test Parameters.
Press the Memory key and using the numeric keypad enter the Memory number you would like
to edit and then press the ENTER key.
Use the ∧ or ∨ arrow keys to progress through the test parameters menu. The ∨ key will
advance forward and ∧ key will advance backward. The sequential forward menu items are
Voltage, HI-Limit, LO-Limit, Ramp-UP, Dwell Unit, Dwell Time, Ramp-DOWN, Frequency,
Arc Detect, Arc Sense, and Connect.
Withstand Display
M XX Set
XX.XX KV
M XX
Set
XXX.X s
X.XX KV
X.XXX mA
XXXX µA
XXX.X s
X.XXX xA
: Memory Program number
: Withstand Voltage test setting screen
: Dwell Time setting
: Output Voltage setting
: High-Limit current setting (AC withstand instruments)
: High-Limit current setting (DC withstand instruments)
5.2.1. Output Voltage setting
Advance the menu to the Voltage parameter.
Voltage
kV
Range:
Note: X = Numeric
Note: x = milli or micro
=
The display will show:
XX.XX
0.00 – XX.00kV
Use the Numeric keys to enter the voltage setting, and then press the ENTER key. The
program will store the voltage setting and advance to the High Limit parameter automatically.
Press the EXIT key to exit from the setting mode to the operation mode if all parameters have
been set.
5.2.2. HI-Limit Current setting
Advance the menu to the HI-Limit parameter.
HI-Limit
=
X.XXX
mA
Range: 0.000 – 9.999mA
The display will show:
or
HI-Limit =
XXXX µA
Range : 0 - 5000µA
Use the Numeric keys to enter the HI-Limit setting, and then press the ENTER key. The
program will store the HI-Limit setting and advance to the LO-Limit parameter automatically.
34
Press the EXIT key to exit from the setting mode to the operation mode if all parameters have
been set.
5.2.3. LO-Limit Current setting
Advance the menu to the LO-Limit parameter. The display will show:
LO-Limit
=
X.XXX mA
Range: 0.000 – 9.999mA
or
LO-Limit = XXX.X µA
Range : 0.0 - 999.9µA
Use the Numeric keys to enter the LO-Limit setting, then press the ENTER key. The program
will store the LO-Limit setting and advance to the Ramp-UP parameter automatically.
Press the EXIT key to exit from the setting mode to the operation mode if all parameters have
been set.
If the LO-Limit is set to “0”, the LO-Limit is disabled.
5.2.4. Ramp-UP Time setting
Advance the menu to the Ramp-UP time parameter.
ACW Units
Ramp-UP
=
Range:
0.3 - 999.9s
XXX.X s
The display will show:
or
DCW Units
Ramp-UP
=
Range:
0.4 - 999.9s
XXX.X s
Use the Numeric keys to enter the Ramp-UP time setting, then press the ENTER key.
program will store the Ramp-UP time setting and advance to the Dwell Time setting
automatically.
The
Press the EXIT key to exit from the setting mode to the operation mode if all parameters have
been set.
5.2.5. Dwell Unit setting
Advance the menu to the Dwell Unit parameter. The display will show:
Dwell Unit =
Second
<ENTER> to Select
or
Dwell Unit =
Minute
<ENTER> to Select
Use the ENTER key to toggle between the Seconds and Minutes. The program will store the
Dwell Unit setting and advance to the Dwell Time setting automatically.
5.2.6. Dwell Time setting
Advance the menu to the Dwell Time parameter. The display will show:
Dwell Time =
Range : 0.3 - 999.9s
XXX.X s
0 = Const.
or
Dwell
Time =
XXX.X m
Range : 0.4 - 999.9m 0 =Const.
35
Use the Numeric keys to enter the Dwell Time setting, and then press the ENTER key. The
program will store the Dwell Time setting and advance to the Ramp -DOWN time setting
automatically. The unit is “second” and 0.1 second per step. The display will show the
elapsed time during the testing.
Press the EXIT key to exit from the setting mode to the operation mode if all parameters have
been set.
If the Dwell Time is set to “0”, the timer will continue to count to the maximum test time then
reset to “0” and start over automatically. The test will continue until a reset is executed or a
failure occurs.
5.2.7. Ramp-DOWN Time setting
Advance the menu to the Ramp-DOWN time parameter.
ACW Units
Ramp-DOWN =
XXX.X s
Range:
0.1 - 999.9s
or
The display will show:
DCW Units
Ramp-DOWN =
XXX.X s
Range: 0, 1.0 - 999.9s
Use the Numeric keys to enter the Ramp-DOWN time setting, then press the ENTER key.
The program will store the Ramp-DOWN time setting and advance to the Frequency Selection
automatically.
Press the EXIT key to exit from the setting mode to the operation mode if all parameters have
been set.
5.2.8. Frequency Selection (AC units only)
Advance the menu to the Frequency parameter and the display will show:
Frequency = 60 Hz
<ENTER> to Select
or
Frequency = 50 Hz
<ENTER> to Select
Use the ENTER key to select the Output Frequency, then press the ∧ or ∨ key to advance to
another test parameter or press the EXIT key to exit from the setting mode to the operation
mode.
5.2.9. Arc Detect and Arc Sensitivity Selection
Advance the menu to the Arc Detection selection. The display will show:
Arc Detect =
ON
<ENTER> to Select
36
or
Arc Detect =
OFF
<ENTER> to Select
Use the ENTER key to toggle the Arc Detect mode, then press the ∧ or ∨ key to advance the
program to the Arc Sense parameter or press the EXIT key to exit from the setting mode to the
operation mode.
Advance the menu to the Arc Sense parameter. The display will show:
Arc Sense =
Range : 1 - 9
X
9 = High
For model 7470, 7472 and 7473, the range of ARC sense is from 1 to 9.
For model 7473, if the voltage is lower than 15KV, the range of Arc sense is from 1 to 9.If the
voltage is higher than 15KV, the range is from 1 to 7.
Use the Numeric keys to enter the Arc Sense setting, and then press the ENTER key. The
numeric value is proportional to the amount of sensitivity, i.e. “9” is the highest sensitivity.
The program will store the Arc Sense setting and advance to the Connect mode selection
automatically.
If the Arc Detect mode is set to ON, the program will indicate an arc failure when the arc
current is over the setting and the program will shut down the test immediately.
If the Arc Detect mode is set to OFF, the program will not indicate an arc failure when the arc
current is over the setting.
5.2.10. Ramp-HI selection (DC units only)
Advance the menu to the Ramp-High parameter. The display will show:
Ramp-HI =
ON
<ENTER> to Select
or
Ramp-HI = OFF
<ENTER> to Select
Use the ENTER key to select the Ramp-HI mode, then press the ∧ or ∨ key to advance the
program to another test parameter or press the EXIT key to exit from the setting mode to the
operation mode.
The Ramp-HI function is active during the Ramp period only. Ramp-HI will allow current
higher than the normal HI-Limit current setting of the DC Withstand Voltage test to avoid false
failure due to charging current.
5.2.11. Charge-LO setting (DC units only)
Advance the menu to the Charge-LO parameter. The display will show:
Charge-LO = XXX.X µA
<TEST> to Auto Set
The Charge-LO function is used to check if the test cables are connected properly at the
37
beginning of a test. A capacitive DUT will draw charging current on the DC Withstand
Voltage test when the Output is activated. If the charging current was lower then the setting,
the test cables may not be connected properly.
This instrument can set the Charge-LO value manually or automatically. To set the
Charge-LO value manually, use the numeric keys to enter the Charge-LO current setting and
then press the ENTER key. The program will store the Charge-LO setting and advance to the
Ramp-HI parameter. The setting range of Charge-LO is from 0.0 to 350.0 µA. The unit is
µA and 0.1µA per step.
To use Auto Set, be sure that the test parameter of Output Voltage and Ramp Time have been
set to the values that will be used for the Final test and connect the test cables and/or test fixture
between the instrument and DUT.
If the scanner is to be used then the scanner channel must
also be set, and then press the TEST button. The instrument will apply the voltage that has
been entered for this memory-step selection.
WARNING
Please be aware that the program will activate high voltage on the output
connector while the Test button is pressed.
The program will read the charging current of DUT and set the Charge-LO current at
approximately one half (1/2) of the reading. The display will show:
Charge-LO = XXX.X µA
<TEST> to Auto Set
The value showing on the display is the Charge-LO setting and is not the reading of the
charging current of the DUT.
Then press the ∧ or ∨ key to advance the program to another test parameter or press the EXIT
key to exit from the setting mode to the operation mode.
5.2.12. Connect
Advance the menu to the Connect selection. The display will show:
Connect
=
<ENTER> to Select
ON
or
Connect
=
<ENTER> to Select
OFF
Use the ENTER key to toggle the Connect Mode ON and OFF.
This function when turned ON will connect or link the current memory to the next memory.
This Allows High Withstand Voltage Tester to Run 50 consecutive tests in a sequence if
desired.
38
5.3. Reviewing Test Results
The method for reviewing test results is to press the ENTER key at the end of the test sequence.
Results can be reviewed at any time before the next test is executed by pressing the ENTER
key and then scrolling with the up and down arrow keys or repeatedly pressing the ENTER key.
The results of the last test in the process will be followed by the first test when scrolling
through the results. All buffers are cleared at the start of the next test cycle.
Pressing the EXIT or RESET key will return you to the Settings screen.
5.4. Default Test Parameters
The following table is a listing of the Default Parameters for the ACW tests available in the
7470 and 7473 High Withstand Voltage Tester and the DCW tests available in the 7472 and
7474 High Withstand Voltage Tester When you receive your High Withstand Voltage Tester
all 50 memory locations will be loaded with these parameters. The Default Parameters are as
follows:
Test Type
ACW units
DCW units
Parameter
Voltage
HI-Limit (current)
LO-Limit (current)
Ramp UP
Dwell Unit
Dwell Time
Ramp-DOWN
Frequency
Arc Detect
Arc Sense
Connect
Voltage
HI-Limit
LO-Limit
Ramp-UP
Dwell Unit
Dwell Time
Ramp-DOWN
Arc Detect
Arc Sense
Ramp-HI
Charge-LO
Connect
Value
1.24kVAC
5.000mA
0.000mA
0.3s
Second
1.0s
0.0s
60Hz
OFF
5
OFF
1.50kVDC
5000µA
0.0µA
0.4s
Second
1.0s
0.0s
OFF
5
OFF
0.0µA
OFF
39
6. Operating Instructions
6.1. Preparation and Instrument Connections
Before the operation of this instrument, make sure that all Test Parameters have been set
properly according to the Test Parameters Setup Procedures. Also, check the system setting
of Remote Control, LCD Contrast, the Alarm Volume, and Fail Stop.
Be sure to connect the appropriate test leads to the device under test (DUT) or test fixture. Be
sure to connect the safety ground (on the rear panel) to a suitable known good ground before
energizing this instrument. Then connect the return lead first to the test fixture or the DUT
followed by the high voltage lead.
Please check your connections to be sure they are making good contact. Clear the area of any
debris that may create a hazardous situation and ask any unnecessary personnel to leave the
area.
DO NOT TOUCH THE DEVICE UNDER TEST, HIGH VOLTAGE
TEST LEAD, ALLIGATOR CLIP, OR CLIP INSULATOR ONCE
THE TEST HAS BEEN STARTED.
WARNING
This instrument is supplied with a high voltage test lead terminated with an alligator clip.
This clip is designed to allow firm connection to the DUT without the need for an operator to
hold a probe or lead in place during the test. This clip and insulator will carry the voltage and
current of this tester but they are not intended to be held by the operator during the test while
the high voltage is energized. Please insure that you do not make contact with the alligator
clip or the clip insulator while high voltage is energized.
6.2. Power Up
Turn on the Input Power Switch. The display will show the Trade Mark, Model Number, and
Version Number first, as follows:
EXTECH HIGH WITHSTAND
VOLTAGE TESTER
747X VER : X.XX
Note: X = Numeric.
The program will then recall the Memory which was last executed.
6.3. Settings Screen
The settings screen will show parameter settings of the test that will be performed and the
memory location that they are stored in. This screen can be accessed after a test is Aborted or
Passed by pressing the RESET button or after a test failure by pressing the RESET button twice.
The following is an example of a Settings Screen for the 7473 before any test has been
executed.
M XX Set
XXX.X s
40
Note: X = Numeric
Note: x = milli or micro
XX.XX KV
X.XXX xA
M XX
Set
XXX.X s
X.XX KV
X.XXX mA
XXXX µA
: Memory Program number
: Withstand Voltage test setting screen
: Dwell Time setting
: Output Voltage setting
: High-Limit current setting (AC withstand instruments)
: High-Limit current setting (DC withstand instruments)
The Settings screen is the main operational screen of instrument.
parameters are monitored while the test is being performed.
From this screen, test
6.3.1. Connected Memory indicator
The connected memory indicator is an under score symbol located directly next to the Memory
number and only will be displayed when the connect function has been turned ON in the Test
parameters.
M XX- Set
XXX.X s
XX.XX KV
X.XXX mA
Connected Memory Indicator
Note: X = Numeric
6.4. Metering
The same parameters described in section 6.3 Settings Screen are monitored live while
performing tests. The following table describes what meters will be displayed.
Model
7470, 7473
7472, 7474
Test Type
AC Withstand
DC Withstand
Current
X
X
Voltage
X
X
Time
X
X
The memory location will also be indicated on the display as well as the connect function
6.5. Performing a Test
1. From the Settings screen, press the MEMORY key and select the memory you wish to
perform using the numeric keypad then press the ENTER key to return you to the
Perform Test screen.
2. Attach the appropriate load or DUT to the instrument (refer to section 6.1 for instrument
connections).
WARNING
DO NOT TOUCH THE DEVICE UNDER TEST, HIGH
VOLTAGE TEST LEAD, ALLIGATOR CLIP, OR CLIP
INSULATOR ONCE THE TEST HAS BEEN STARTED.
41
3. Press the TEST button.
4. The instrument will now perform the test or connected sequence of tests.
6.5.2. Discharge Function in DC units
The 7472 and 7474 units are equipped with a Discharge function that is designed to discharge
the voltage of a capacitive DUT so that it may be safely disconnected from the test leads of the
instrument. The discharge function monitors the voltage of the DUT and remains active until
the voltage of the DUT falls below 40 volts. The instrument will also not allow another test to
be executed until the voltage of the DUT falls below 40 volts. The discharge period will
occur either directly after the Dwell time, if Ramp-DOWN is set to “0”, or after the designating
Ramp-DOWN time.
DO NOT TOUCH THE DEVICE UNDER TEST, HIGH
VOLTAGE TEST LEAD, ALLIGATOR CLIP, OR CLIP
INSULATOR DURING THEDISCHARGE CYCLE.
The Discharge cycle is a means by which the instrument drains any
WARNING remaining charge from a DUT after the completion of a test. The
Discharge cycle is active when the word “Discharge” appears on the
screen and is also indicated by the flashing high voltage lamp, active
voltmeter, and timer. Never attempt to remove a DUT from the
instrument during the Discharge cycle. Always allow the Discharge
cycle to complete before powering down the instrument.
During the Discharge time, the display will show:
MXX Discharge
XX.XX KV
XXX.X s
If the capacitance of the DUT is very small it is possible that you will not see this display due
to the short amount of time required to discharge the DUT. discharge the DUT.
The voltage and time of the discharging DUT will be displayed during the discharge period but
this information is only intended for reference and cannot be reviewed after the end of the
discharge period. The process signal of the remote I/O remains active during the discharge
period and the high voltage lightning bolt indicator on the front panel of the instrument is also
active during the discharge period.
As a safety precaution, if the RESET button is pressed during the discharge period, the
instrument will log the RESET but will not discontinue the discharge function. Pressing the
RESET during the discharge will only prevent a connected memory from executing after the
discharge time.
42
The capacitance of the DUT should never exceed the maximum specification listed in this
manual.
6.5.3. Manual Voltage Adjustment
When HIGH WITHSTAND VOLTAGE TESTER is performing a test, the ∨ (down) and ∧(up)
keys may be used to adjust the output voltage.
Pressing the ∧(up) key will increase the output voltage, pressing the ∨ (down) key will decrease
the output voltage. Manual voltage adjustment temporarily overrides the voltage setting and
only remains in effect until the test is terminated by Pass, Fail, or Abort.
When the Lock parameter is selected ON in the system menu, manual voltage adjustment is
disabled.
43
7. Displayed Messages
7.1. Running Test Messages all units
If the test in process is Aborted with the RESET button or remote control, the display will
show:
MXX Abort
XX.XX KV
XXX.X s
XX.XX mA
If the test in process is Aborted with the RESET button or remote control before the meter
readings are taken, the display will show:
MXX Abort
- - . - - KV
XXX.X s
- - . - - mA
or
MXX Abort
XX.XX KV
XXX.X s
- - . - - mA
At the beginning of AC Withstand Voltage test when the voltage begins to ramp but before the
meter readings are taken, the display will show:
MXX Ramp-UP
- - . - - KV
XXX.X s
- - . - - mA
During the AC Withstand Voltage test when the values are being updated in real time during
the ramp cycle, the display will show:
MXX Ramp-UP
XX.XX KV
XXX.X s
XX.XX mA
During the AC Withstand Voltage test when the values are being updated in real time during
the dwell cycle, the display will show:
MXX Dwell
XX.XX KV
XXX.X s
XX.XX mA
If the ramp time is very short and the program has not read the meter readings, the display will
show:
MXX Dwell
- - . - - KV
XXX.X s
- - . - - mA
If the DUT current exceeds the HI-Limit of AC Withstand Voltage test and the leakage current
is within the metering range, the display will show:
MXX HI-Limit
XX.XX KV
XXX.X s
XX.XX mA
If the DUT current exceeds the HI-Limit of AC Withstand Voltage test and the leakage current
is not within the metering range, the display will show:
44
MXX HI-Limit
XX.XX KV
XXX.X s
> 10 mA
If the DUT current is well beyond the metering range of AC Withstand Voltage test the
instrument assumes that the failure is due to a short circuit, the display will show:
MXX Short
- - . - - KV
XXX.X s
> 10 mA
If the DUT current is well beyond the metering range of AC Withstand Voltage test and an
Arcing condition beyond the Arc Sense limit is indicated, the display will show:
MXX Breakdown
XX.XX KV
XXX.X s
> 10 mA
If the DUT current falls below the LO-Limit of AC Withstand Voltage test, the display will
show:
MXX LO-limit
XX.XX KV
XXX.X s
XX.XX mA
If the DUT current is within the metering range of the AC Withstand Voltage test and an
Arcing current exceeds the Arc-Sense limit and the Arc function is set to ON, then an Arc
failure has occurred and the display will show:
MXX Arc-Fail
XX.XX KV
XXX.X s
XX.XX mA
If a Ramp-DOWN time has been set and the dwell portion of the test
will show:
is complete the display
MXX Ramp-DOWN XXX.X s
XX.XX KV
XX.XX mA
If the DUT has passed the AC Withstand Voltage test and the test process is complete the
display will show:
MXX Pass
XX.XX KV
XXX.X s
XX.XX mA
45
7.2. Additional Displayed messages for DC units
If the Ramp-HI function is enabled and the leakage current during the Ramp cycle exceeds
5mA, then the display will show:
MXX Ramp-HI
XX.XX KV
XXX.X s
>5000 µA
If the leakage current during the Ramp cycle falls below the Charge -LO setting, then the
display will show:
MXX Charge-LO
XX.XX KV
XXX.X s
XXX.X. µA
When running capacitive DUTS the instrument will discharge the DUT at the end of the Dwell
or Ramp-DOWN cycle depending on the test settings. The display will show the following
screen during the discharge cycle:
MXX Discharge
XX.XX KV
XXX.X s
If the capacitance of the DUT is very small it is possible that you will not see this display due
to the short amount of time required to discharge the DUT.
DO NOT TOUCH THE DEVICE UNDER TEST, HIGH
VOLTAGE TEST LEAD, ALLIGATOR CLIP, OR CLIP
INSULATOR DURING THE DISCHARGE CYCLE.
WARNING
The Discharge cycle is a means by which the instrument drains any
remaining charge from a DUT after the completion of a test. The
Discharge cycle is active when the word “Discharge” appears on the
screen and is also indicated by the flashing high voltage lamp, active
voltmeter, and timer. Never attempt to remove a DUT from the
instrument during the Discharge cycle. Always allow the Discharge
cycle to complete before powering down the instrument.
7.3. BUS Remote message
The REM indicator will be displayed when the instrument is in the Remote Control mode.
When the BUS Remote is on the instrument is able to send and receive signals across the GPIB
IEEE-488 or RS-232 bus.
M XX Set
XXX.X s
XX.XX KV REM X.XXX mA
46
7.4. Fatal Error
The only active button or key in this situation is the RESET button. The only reason the
RESET button is active is to allow you to silence the alarm and open the fail relay. This type
of failure permanently locks the instrument in the “Fatal Error” mode and requires that the
instrument be serviced by Extech. The customer should contact Extech Electronics Ltd., Co.
to receive further instruction. An example of the Fatal Error screen appears as follows:
FATAL ERROR
9002
Call 1-800-858-8378
FATAL ERROR
9003
Call 1-800-858-8378
The following Fatal Error identification numbers will represent type of the failure that has
occurred:
Error Code 9002 will appear on the display, if the instrument’s System data or the
Model/Option/Serial Number data are corrupted and do not match the settings.
Error Code 9003 will appear on the display, if the instrument’s Calibration data is corrupted.
7.5. Output Error
If the instrument has an internal problem and the TEST button is pressed, the Output Error
screen will appear as follows:
OUTPUT ERROR!
Press EXIT Continue
The RESET button is not active while this screen is displayed. To clear this screen and return
to test mode the EXIT key must be pressed. When the EXIT key is pressed, the instrument
will continue with its normal failure indication process. The failure light and Alarm can then
be cleared by pressing the RESET button. This message appears on the display after exiting
from the Output Error screen.
MXX Out-Error
XX.XX KV
XXX.X s
XX.XX mA
47
8. Connection of Remote I/O
Two 9-pin “D” type connectors are mounted on the rear panel that provide
REMOTE-INPUT-OUTPUT control and information. These connectors mate with standard 9
pin D-sub-miniature connector provided by the user. The output mates to a male (plug)
connector while the input mates to a female (receptacle) connector. For best performance, a
shielded cable should be used. To avoid ground loops the shield should not be grounded at
both ends of the cable. Suggested AMP part numbers for interconnecting to the Remote I/O
are shown below:
Remote Interface Rear Panel:
SIGNAL OUTPUT
FAIL
SIGNAL INPUT
RESET
PASS
TEST
INTERLOCK
5
9
1
6
RESET
OUT
1
6
5
9
MEMORY 1
PROCESSING
MEMORY 2
MEMORY 3
8.1. Signal Outputs on Remote I/O
The rear panel connector provides three output signals to remotely monitor PASS, FAIL, and
PROCESSING conditions. The monitoring signals are provided by three normally open
internal relays that toggle on and off to indicate the condition of the tester. These are normally
open free contacts and will not provide any voltage or current. The ratings of the contacts are
1 AAC / 125 VAC (0.5 ADC / 30 VDC). The signal outputs are provided on the 9-pin female
D connector. Below is a listing that indicates what conditions activate each pin. When a
terminal becomes active, the relay closes thereby allowing the external voltage to operate an
external device.
Pins 1 and 2 provide the PASS signal.
Pins 3 and 4 provide the FAIL signal.
Pins 5 and 6 provide the PROCESSING signal.
Pins 7 and 8 provide the RESET OUT signal.
The following describes how the relays operate for each test condition:
PROCESSING – The relay contact closes the connection between pin (5) and pin (6) while the
instrument is performing a test. The connection is opened at the end of the test. The process
contact is closed all the way through to the end of the discharge cycle in DC units.
PASS – The relay contact closes the connection between pin (1) and pin (2) after detecting that
the item under test passed all tests. The connection is opened when the next test is initiated or
48
the reset function is activated.
FAIL – The relay contact closes the connection between pin (3) and pin (4) after detecting that
the item under test failed. The connection will open when the next test is initiated or the reset
function activated.
RESET OUT – The relay contact closes the connection between pin (7) and pin (8) while the
reset function is activated. This is only a continuous closure dependent on the length of time the
reset button is held in an active state.
8.2. Signal Inputs of Remote I/O and Memory Access
The High Withstand Voltage Tester remote connector enables remote operation of the TEST,
RESET, and REMOTE INTERLOCK functions, and allows the operator to select Memory 1,
Memory 2, and Memory 3.
When the PLC Remote mode is on, the High Withstand Voltage Tester will respond to simple
switch or relay contacts closures. A normally open momentary switch can be wired across
pins 3 and 5 to allow remote operation of the TEST function. A minimum pulse width or
contact closure of 20mS is required to guarantee a test start. A normally open momentary
switch can be wired across pins 2 and 5 to allow remote operation of the RESET function. A
minimum pulse width or contact closure of 50mS is required to guarantee that a running test
will abort. When the PLC remote function is (ON) the TEST switch on the front panel will be
disabled to prevent a test from being activated through this switch. For safety, the front panel
RESET switch remains active even when a remote reset switch is connected so that high
voltage can be shut down from either location.
The High Withstand Voltage Tester also allow access to three MEMORY PROGRAMS
through the remote control connector. This gives the user the capability to quickly change
parameters and initiate a test remotely. The built in memory programs of the instrument are
used to accomplish this. Three internal memory programs can be accessed, by connecting
terminals 7, 8, and 9 in different combinations. The memory select lines should be set
simultaneously and remain set for a minimum of 20ms to guarantee that the correct memory
will be selected. However, the memory select bits may be set in sequential manner, provided
that the time delay between each bit is less than 4ms. When the desired bit pattern has been
established it should remain set for a minimum of 20ms to guarantee that the correct memory
will be selected. It may be necessary to "OR" the momentary switches (relay contacts) to
prevent incorrect program selection due to timing errors.
WARNING
ACTIVATING MEMORY PROGRAM FUNCTIONS THROUGH THE
REMOTE CONNECTOR, SELECTS THE PROGRAM AND STARTS
THE TEST WHICH IS PREPROGRAMMED INTO THAT MEMORY
CAUTION
DO NOT CONNECT VOLTAGE OR CURRENT TO THE SIGNAL
INPUTS, THIS COULD RESULT IN DAMAGE TO THE CONTROL
CIRCUITRY.
MEMORY ONE – Momentarily connecting terminal 7 to 8 signals the instrument to
immediately begin the test program that is stored in memory one.
49
MEMORY TWO – Momentarily connecting terminal 7 to 9 signals the instrument to
immediately begin the test program that is stored in memory two.
MEMORY THREE – Momentarily connecting terminal 7 to terminals 8 and 9 signals the
instrument to immediately begin the test program that is stored in memory three.
Remote Interlock
High Withstand Voltage Tester is equipped with a featured referred to as “Remote Interlock”.
Remote Interlock is a feature that utilizes a set of closed contacts to enable the instruments
output. In other words, if the Interlock contacts open, the output of the instrument will be
disabled. Remote Interlock could also be referred to as a remote system lockout, utilizing
“Fail When Open” logic. If the Interlock contacts are open and the Test button is pushed, a
pop-up message will be displayed on the screen for two seconds. The message will appear as
follows:
Interlock Is Open
If the Interlock contacts are opened during a test, the pop-up message will be displayed and the
test will abort. The hardware and has been configured to provide the interlock connections on
pins 4 and 5 of the Remote Interface, Signal Input port. The instrument can still be used
without the external interlock device as long as the Interlock Connector is plugged into the
Remote Interface, Signal Input port. If there is nothing connected to the Remote Interface,
Signal Input port to provide a connection to the interlock, the instrument will not perform tests.
PLC Remote Pop-up message
If you attempt to start a test from the front panel Test button and the PLC remote function is
turned ON, a pop-up message will be displayed. The pop-up message will appear as follows:
PLC Remote ON
50
9. Bus Remote Interface GPIB / RS-232 (Option)
This section provides information on the proper use and configuration of bus remote interface.
The RS-232 interface also uses the same command set as the GPIB interface for setting of test
parameters. However, many functions of the GPIB 488.2 interface are not available through
RS-232. The IEEE-488 interface included with High Withstand Voltage Tester conforms to
the requirements of the IEEE-488.2 standard.
9.1. GPIB Messages
There are typically two types of messages that GPIB devices use to communicate with other
interconnected GPIB devices;
Interface messages: Often called commands or command messages and Device dependent
messages often called data or data messages.
Data Messages: Contain information such as programming instructions or measurement
results. Command Messages perform functions such as initializing the bus and addressing and
unaddressing devices.
9.2. Functions
A GPIB device can be a Listener, Talker, and/or Controller. A Talker sends data messages to
one or more Listeners, which receive data. A Controller manages the information flow on the
GPIB by sending commands to all devices. The GPIB bus is much like a computer bus except
a computer has circuit cards connected via a backplane and the GPIB has stand-alone devices
connected via a cable.
9.3. Signals and Lines
The GPIB consists of 16 signal lines and 8 ground-return or shield drain lines. The 16 signal
lines are grouped into 8 data lines, 3 handshake lines, and 5 interface management lines.
Data Lines: The eight data lines, DI01 through DI08 carry data and command messages.
The 7-bit ASCII or ISO code set is used and the eighth bit DI08 is unused.
Handshake Lines: The transfer of message bytes between devices is done via three
asynchronous control lines. Referred to as three-wire interlocked handshake. This
guarantees that message bytes on the data lines are sent and received without transmission
error.
NRFD (not ready for data) indicates when a device is ready or not ready to receive a message
byte.
NDAC (not data accepted) indicates when a device has or has not accepted a message byte.
DAV (data valid) tells when the signals on the data lines are stable (valid) and can be accepted
safely by devices.
Interface Management Lines:
the interface.
Five lines are used to manage the flow of information across
ATN (attention) ATN is driven true by the controller when it uses the data lines to send
51
commands, and drivers ATN false when a Talker can send data messages.
IFC (interface clear) IFC is driven by the system controller to initialize the bus and become
CIC.
REN (remote enable) The REN line is driven by the controller that is used to place devices in
remote or local program mode.
SRQ (service request) The SRQ line can be driven by any device to asynchronously request
service from the Controller.
EOI (end or identify) This line has two purposes- the Talker uses this line to mark the end of a
message string, and the Controller uses it to tell devices to identify their response in a parallel
poll.
9.4. GPIB Connector
Connection is usually accomplished with a 24-conductor cable with a plug on one end and a
connector at the other end. Devices may be connected in a linear, star or a combination
configuration.
The standard connector is the Amphenol or Cinch Series 57 Microribbon or AMP CHAMP
type. The GPIB uses negative logic with standard transistor-transistor logic (TTL) levels.
When DAV is true, for example, it is a TTL low level (≤ 0/8 V), and when DAV is false, it is a
TTL high level (≥ 2.0 V).
Restrictions and Limitations on the GPIB
A maximum separation of 4 m between any two devices and an average separation of 2 m over
the entire bus. A maximum total cable length of 20 m.
No more than 15 device loads connected to each bus, with no less than two-thirds powered on.
For example 1 GPIB controller and a maximum of 14 GPIB instruments.
Note: A bus extender, which is available from numerous manufacturers, is available to
overcome these limitations.
9.5. GPIB Address
This interface is optional on the High Withstand Voltage Tester. Each device on the GPIB
(IEEE-488) interface must have a unique address. You can set the address of the High
Withstand Voltage Tester to any value between 0 and 30. The address is set to 8 when the
instrument is shipped from the factory. The address can only be set from the front panel.
The address is stored in non-volatile memory and does not change when the power has been off
or after a remote reset.
9.6. Interface Functions
The capability of a device connected to the bus is specified by its interface functions. These
functions provide the means for a device to receive, process, and send messages over the bus.
The interface functions are listed in the chart below.
52
GPIB 488.1 INTERFACE FUNCTIONS
Interface Function
Subset
Description
Source Handshake
SH1
Complete Source handshake capability
Acceptor Handshake
AH1
Complete Acceptor handshake capability
Talker
T6
Talker functions (unaddress if MLA)
Listener
L4
Listener functions (unaddress if MTA)
Service Request
SR1
Complete Service request capability
Remote Local
RL0
No remote/local capability
Parallel Poll
PP0
No parallel poll capability
Device Clear
DC1
Complete Device clear capability
Device Trigger
DT0
No device trigger capability
Controller
C0
No controller capability
Electrical Interface
E2
Three-state drivers
Controllable Items
Test and Reset control.
Setting of test parameters for tests.
Reading of instrument status and test results.
Data Codes
ASCII
Delimiter
NL (+ EOI)
9.7. RS-232 Interface
This interface is standard on High Withstand Voltage Tester. This interface provides all of the
control commands and parameter setting commands of the GPIB interface with the exception
of some of the 488.2 Common Commands and SRQ capability. All commands can be found
in the command list, section 9.8.1 to 9.8.6 of this manual. The identification command *IDN
and the Status Reporting commands are also available through RS-232.
The RS-232 cabling should be configured as follows for a 9-pin serial port interface:
Instrument RS-232 Port
PC / Bus Controller
RD
2
2
RD
TD
3
3
TD
SIG
GND
5
5
SIG
GND
The COM port should have the following configuration. 9600 baud, 8 data bits, 1 stop bit, no
parity. This interface does not support XON/XOFF protocol or any hardware handshaking.
The controller should be configured to ignore the handshaking lines DTR (pin 4), DSR (pin 6)
CTS (pin 8) and RTS (pin 7). If the port cannot be configured through software to ignore the
lines then the handshake lines should be jumpered together in two different sets. Pins 4 and 6
jumpered together and pins 7 and 8 jumpered together at the controller end of the cable.
53
When sending command over the RS232 bus the instrument will send a response string of 06
hex or 6 decimal, the Acknowledge (ACK) ASCII control code if the transfer was recognized
and completed by the instrument. If there is an error with the command string that is sent, the
instrument will respond with 15 hex or 21 decimal, the Not Acknowledge (NAK) ASCII
control code. The ACK or NAK response allows for software handshaking, to monitor and
control data flow. When requesting data from the instrument, it will automatically send the
data back to the controller input buffer. The controller input buffer will accumulate data being
sent from the instrument including the ACK and NAK response strings, until it has been read
by the controller.
9.8. GPIB / RS-232 Interface Command List
A GPIB read command must be sent after the command strings, to retrieve any data from a
query command (?). The High Withstand Voltage Tester GPIB bus will not send any data to
the controller without being queried. The RS-232 bus will automatically send any response
back to the controller's input buffer. Each command string should be terminated by the ASCII
control code, New Line <NL>, OAh or the end of line EOL message for GPIB.
The following conventions are used to describe the commands syntax for High Withstand
Voltage Tester. Braces ({ }) enclose each parameter for a command string. Triangle
brackets (< >) indicate that you must substitute a value for the enclosed parameter. The Pipe
( | ) is used to separate different parameter options for a command, select one of these as the
data for the command.
When sending the command none of the previous mentioned characters should be included,
they are only for reference purposes in this manual. Nor should quotation (“ ”) marks be
include when sending the commands. Also the command and the parameter data must be
separated with a space.
All commands that end with a question mark (?) are query commands and required an
IEEE-488 read command to retrieve the data from the device's output buffer.
9.8.1. Test Execution Commands
The following commands are used to control actual output voltage and current from the
instrument. Please observe all safety precautions.
Command
TEST
RESET
SACG
Description
Execute a Test
Abort a test in Process or Reset Failures
Set Auto-Charge-LO
TEST
Starts the test sequence at the selected memory location that has been loaded into the
instruments memory (RAM).
RESET
Stop or abort a test.
54
Also used to reset a latched failure condition.
SACG
Set the Charge-LO parameter for the DCW test. The cables and any test fixture should be
connected before executing the command. The test parameters that are set for the memory
will be used when performing the auto setting. This command will perform an actual test and
all safety precautions should be observed when using this command.
9.8.2. File Editing Commands
The following commands are used to create or modify Test Setup Files.
Command
FL <memory number>
ADD
<test,p1,p2,p3…>
SF {1|0}
Description
File Load
Add all parameters of a
test
Fail Stop
Value
memory number = 1-50
1=On, 0=Off
FL <memory number>
Load a file by memory number from non-volatile memory into random access memory RAM.
ADD <test,p1,p2,p3…>
This command edits all parameters in a memory location. Parameters will be edited at the
memory location that has been selected.
The parameter <test> indicates the test type. The test type values ACW or DCW must be
used. The parameters <p1,p2> etc. indicate the individual settings for each test. All
parameters must be included with the command and should appear in the same order that is
shown in the table below. Also, like the individual parameter editing commands, the unit
should not be included with the value. Only the numeric value should be included in the
command string. The list of parameters can also be found in the default parameters section of
the manual, or refer to the Test Parameter Editing commands section for the proper values.
The parameter values should use complete text and not use the coded values that are associated
with the individual parameter setting commands such as "ON" and "OFF”. The LS?
companion command will also list all parameters in complete text in the order as they appear in
the following table, preceded by the memory number.
1
2
3
4
5
6
7
8
9
10
ACW
Voltage
HI-Limit
LO-Limit
Ramp Up
Dwell Unit
Dwell Time
Ramp Down
Frequency (50/60)
Arc Detect (ON/OFF)
Arc Sense
DCW
Voltage
HI-Limit
LO-Limit
Ramp Up
Dwell Unit
Dwell Time
Ramp Down
Arc Detect (ON/OFF)
Arc Sense
Ramp-HI (ON/OFF)
55
11
12
Connect (ON/OFF)
Charge-LO
Connect (ON/OFF)
9.8.3. Test Parameter Editing Commands and Companion Queries
These commands are used to modify the test parameter within each memory. These
commands require a parameter value to be included with the command. The companion
query command will read the parameter. The writing of the parameter requires that the unit
not be included with the value, only the numeric value should be included with the command.
Also, when the query commands are used the response will not include the unit’s characters.
Many of the commands will function the same way for multiple test types; however, the input
range may be different and therefore used a different possible set of values.
Command
Name
Test
Types
ACW
DCW
ACW
DCW
ACW
DCW
DCW
Value
EA < value >
EA?
EAD {1|0}
EAD?
ECC {1|0}
ECC?
ECG < value >
ECG?
EDW < value >
EDW?
Edit Arc
Edit Dwell
ACW
DCW
EF {1|0}
EF?
EH < value >
EH?
EL < value >
EL?
Edit Frequency
ACW
0, 0.3 - 999.9s (7470, 7473)
0, 0.4 - 999.9s (7472,7474)
0, 0.1 - 999.9m
1=60Hz, 0=50Hz
Edit HI-Limit
ACW
DCW
ERD <value >
ERD?
ERH {1|0}
ERH?
ERU < value>
ERU?
Edit Ramp-DOWN
Edit Ramp-UP
ACW
DCW
EV <value>
EV?
Edit Voltage
ACW
DCW
Edit Arc-Detect
Edit Connect
Edit Charge-Lo
Edit LO-Limit
Edit Ramp-HI
ACW
DCW
DCW
1–9
1= On, 0=Off
1= On, 0=Off
0.0 - 350.0uA
0.000 – 9.999mA (7473, 7470)
10.00 - 20.00mA (7470)
0.0 – 999.9 uA (7472, 7474)
1000 – 9999uA(7472)
1000 - 5000uA (7474)
0.0 - 999.9s (7470, 7473)
0, 1.0 - 999.9s (7472, 7474)
1= On, 0=Off
0.1 - 999.9s (7470)
0.3 - 999.9s (7473)
0.4 - 999.9s (7472, 7474)
0 - 10.00kV (7470)
0 - 12.00kV (7472)
0 - 20.00kV (7473)
0 - 20.00kV (7474)
9.8.4. System Parameter Editing Commands and Companion Queries
56
These commands are used to modify the system parameters for the instrument. These
commands require a parameter value to be included with the command. The companion
query command will read the parameter using the same value that is used for setting the
parameter.
Command
SPR {1|0}
SPR?
SF {1|0}
SF?
SAL < value >
SAL?
SC < value >
SC?
SL {1|0}
SL?
SML {1|0}
SML?
SSG {1|0}
SSG?
SD1 < value >
SD1?
SD2 {1|0}
SD2?
SPM {2|1|0}
SPM?
SPRE {1|0}
SPRE?
SPS {1|0}
SPS?
SFF {1|0}
SFF?
Name
PLC Remote
Value
1= On, 0=Off
Fail Stop
1= On, 0=Off
Alarm Volume
0-9
Contrast
1-9
Lock
1= On, 0=Off
Memory Lock
1= On, 0=Off
Smart GFI
1= On, 0=Off
Device ID
0 - 9999999
Device ID
1= On, 0=Off
Print Mode
0=AUTO, 1=MANUAL, 2=OFF
Prn Result n
1=FAIL, 0=ALL
Prn Setting n
1= On, 0=Off
Form Feed n
1= On, 0=Off
9.8.5. Query Commands
These query commands will retrieve data from the instrument. The GPIB bus application
requires an IEEE-488 read command to be sent after the query command. These commands
include functions for retrieving test data, test results and remote hardware status as well as
setup file information.
Command
TD?
RD < memory number>?
RR?
RI?
LS?
Name
List Testing Data
List Results Data
Read Remote Reset
Read Remote Interlock
List Memory Parameters
Value
Test In Process
memory number = 1-50
1=Open, 0=Closed
1=Open, 0=Closed
57
Command
LS <memory number>?
Name
List Memory Parameters by
memory number
Value
memory number = 1-50
TD?
Read the active data being displayed on the LCD display while the test is in process. It will also
read the last data taken when the test sequence has completed. Each parameter is separated by
commas and includes memory number, test type, test status, and metering. The syntax for this
command response is {memory, test type, status, kV meter, mA meter, dwell time}. Each
meter will contain only the value and not the units. In the case of DCW current where both
uA and mA are used on the display, the command response will always indicate the current in
uA for example 2.0mA will respond with 2000 for 2000uA.
RD <memory number>?
Read the results for an individual memory. The memory number is the actual memory
number that has been saved within the file, not the order of which the memories were executed.
For example if the test was executed starting from memory 3 and ending with memory 5 then
the first test results will be found in location 3 not in location 1. Each parameter is separated
by commas and includes memory number, test type, test status, and metering. The syntax for
this command response is {memory, test type, status, kV meter, mA meter, dwell time}.
Each meter will contain only the value and not the units. In the case of DCW current where
both uA and mA are used on the display the command response will always indicate the current
in uA for example 2.0mA will respond with 2000 for 2000uA.
RR?
Read the remote Reset input signal. When the remote reset has be activated by closing the
contacts the query will return a value of 1 to indicate the instrument is being Reset.
RI?
Read the remote Interlock input signal. When the remote Interlock has be activated by
opening the contacts the query will return a value of 0 to indicate the instrument is in the
Interlock state and will not be able to generate output voltage or current.
LS?
Lists all the Parameters for the individual memory that is currently selected. See the ADD
command for the list of parameters. A comma (,) will separate each parameter and will be
preceded with the memory number.
LS <memory number>?
Lists all the Parameters for the individual memory indicated by memory number = 1-50. See the
ADD command for the list of parameters. A comma (,) will separate each parameter and will be
preceded with the memory number.
9.8.6. IEEE 488.2 Common Commands
These commands are required by the IEEE-488.2 standard with the exception of *PSC, *PSC?.
Most of these commands are not available over the RS-232 bus except for the *IDN? command
58
which can be used to retrieve the instrument identification information, and the four status
reporting commands *ESR?, *ESE, *ESE? and *STB?
Command
*IDN?
Name
Identification Query
Description
Extech Electronics Ltd., Co., Model
Number, Serial Number, Firmware
Revision
Resets
00H=OK
01H=TEST EEPROM ERROR
*RST
*TST?
Reset Command
Self-Test Query
*CLS
Clear Status Command
Clear Standard Event Status Register
Clear Service Request Register
*OPC
Operation Complete Command
*OPC?
Operation Complete Query
When all selected pending
operations complete, ESR BIT0=1
When all selected pending
operations complete, Output Queue=1
*WAI
Wait-to-Continue Command
*PSC {1|0}
Power-on Status Clear Command
1 = Power-on clear enable registers
0 = Power-on load previous enable
registers
*PSC?
Power-on Status Clear Query
*ESR?
Standard Event Status Register Query
*ESE <value> Standard Event Status Enable
Command
*ESE?
Standard Event Status Enable Query
*STB?
Read Status Byte Query
*SRE <value> Service Request Enable Command
*SRE?
Service Request Enable Query
*IDN?
Read the instrument identification string.
0 - 255
value = 0 - 255
0 - 255
Read Status Byte
value = 0 - 255
0 - 255
Company =Extech Electronics Ltd., CO.
*RST
Reset the instrument to original power on configuration. Does not clear Enable register for
Standard Summary Status or Standard Event Registers. Does not clear the output queue.
Does not clear the power-on-status-clear flag.
*TST?
Performs a self-test of the instrument data memory.
fails.
Returns 0 if it is successful or 1 if the test
*CLS
Clears the Status Byte summary register and event registers. Does not clear the Enable
registers.
59
*OPC
Sets the operation complete bit (bit 0) in the Standard Event register after a command is
completed successfully.
*OPC?
Returns an ASCII "1" after the command is executed.
*WAI
After the command is executed, it prevents the instrument from executing any further query or
commands until the no-operation-pending flag is TRUE.
*PSC {1|0}
Sets the power-on status clear bit. When set to 1 the Standard Event Enable register and
Status Byte Enable registers will be cleared when power is turned ON. 0 setting indicates the
Enable registers will be loaded with Enable register masks from non-volatile memory at power
ON.
*PSC?
Queries the power-on status clear setting. Returns 0 or 1.
*ESR?
Queries the Standard Event register. Returns the decimal value of the binary-weighted sum of
bits.
*ESE <value>
Standard Event enable register controls which bits will be logically OR’d together to generate
the Event Summary bit 5 (ESB) within the Status Byte.
*ESE?
Queries the Standard Event enable register.
sum of bits.
Returns the decimal value of the binary-weighted
*STB?
Read the Status Byte. Returns the decimal value of the binary-weighted sum of bits.
*SRE <value>
Service Request enable register controls which bits from the Status Byte should be use to
generate a service request when the bit value = 1.
*SRE?
Queries the Service Request enable register. Returns the decimal value of
sum of bits.
9.8.7. Status Reporting
60
binary-weighted
Status reporting system is configured using two types of registers. An Event Register and a
Summary register. The summary register is known as the Status Byte register and records
high-level summary information acquired by the event registers.
An Event register reports defined conditions or messages at each bit. The bits are latched and
remain at an active state until the register is either Read or Cleared. Reading the event register
automatically clears the register and sets all bits to inactive state or 0. When querying an
event register the information is returned as a decimal number representing the binary-weighted
sum of all bits within the register.
The Enable registers bits represent the selection of bits that will be logically-ORed together to
form the summary bit in the status byte. The *CLS command will not clear the enable
registers and if you wish to clear the register you must set it to a value of 0. Like the event
register, the enable register is represented as a decimal number that equals the binary-weighted
sum of all bits.
The enable register will clear to value of 0 at power up unless the *PSC 0 command had been
executed before power-off. The *PSC command tells the device whether or not it should clear
the enable registers at power-on. Using this command will allow SRQs to function
immediately after power-on.
Bit Binary
weight
0
1
1
2
2 4
3
8
4
16
5
32
6
64
Standard Event Register
Event Register
Enable
Register
Operation Complete
not used
Query Error
Device Error
Execution Error
Command Error
not used
7
Power On
128
*ESR?
*ESE
*ESE?
Status Byte Register
Summary Register
Enable
Register
ALL PASS
FAIL
ABORT
TEST IN PROCESS
Message Available (MAV)
Event Summary Bit (ESB)
Request Service (RQS) or
not used
Master Summary Status (MSS)
not used
*STB? | SPOLL
*SRE
*SRE?
9.8.8. GPIB Service Request
The service request capability is not available with the RS-232 interface. The SRQ line will
be activated only after one or more of the service request functions have been enabled using the
Status Byte Enable Register command *SRE.
The status byte bit assignments are as described in the previous section for status reporting.
When the instrument has requested service, the enabled bit or bits and the RQS bit 6 will be
active or 1. Bit 4, 5, and 7 are not used and will be set to false, or 0 for all status byte reads.
After the serial poll (SPOLL) is executed the RQS bit will be cleared to 0, and the remaining
bits will remain unchanged. The status byte, ESB bit will not change value until the event
register is read and cleared for the corresponding status byte bit.
61
For example after the All Pass SRQ has been enabled, when the test(s) have finished with pass
indications the instrument will set the hardware SRQ line and output the status byte of 41 hex.
This means that bit 6 and bit 0 are set to a value of 1. After reading the status byte the status
byte value will change to 01 hex.
9.9. Example of Communicating Over the GPIB Bus
To write commands over the IEEE bus you must enter the code that is specific to the software
language you are using. Then follow the example below.
To set the output voltage across the IEEE bus at 8000 volts do the following. First select a
memory by sending, for example the string for memory one ''FL 1", then send the string "EV
8.0". This tells the instrument to set the voltage at 8.0kV. A string is a list of ASCII
characters, octal or hex bytes or special symbols.
However do not include the quotation
marks (“ ”) when sending the command string.
If you wish to set the Ramp-UP time of the test across the IEEE bus at 10 seconds, do the
following, send the string "ERU 10.00". This tells the instrument to set the Ramp-UP time at
10.00 seconds.
To read the live testing data, first send the string "TD?" then send the GPIB command to
read. For RS-232 the response will be sent automatically to the controller. The instrument
will send a string of parameters separated by commas for each meter on the display, for
example the data for an ACW test might be as follows: "01,ACW,Dwell,3.00,1.25,2.5" this
represents an ACW test at memory number 1, 3.00kV output voltage, 1.25mA total current and
the elapsed time for the Dwell cycle is 2.5 seconds.
9.10. Non Volatile Memory
The instrument saves each parameter in non-volatile memory when the parameters are sent to
the instrument. The non-volatile memory has a limited write cycle life, therefore for
programmers who wish to send all parameters before executing each test, should use Memory
50. The parameters will be stored in the CPU's Random Access Memory (RAM) until another
memory location is selected. However, settings written to RAM from GPIB/RS-232 mode
will be lost when power is shut down. Parameter changes to RAM are unlimited and will not
affect the life of the internal non-volatile memory chip.
9.11. BUS Remote message
The REM indicator will be displayed when the instrument is in the Remote Control mode.
When the BUS Remote is on the instrument is able to send and receive signals across the GPIB
IEEE-488 or RS-232 bus.
M XX Set
XX.XX KV
62
REM
XXX.X s
X.XXX mA
10. Options
GPIB Interface
This option may be substituted for the RS232 interface. This option provides all of the
function control of the RS232 interface with the addition of SRQ functions. All commands
can be found in section 9. Bus Remote Interface GPIB/RS-232 of this manual.
Printer Port Option
This option allows the instrument to generate hardcopy printout of the test results. The
printout can be configured to print automatically with each test, or manually by pressing a front
panel key. There is also capability to enter a serial number identifier to each test that
increments automatically after each test is performed. The test can be further configured to
print only results from tests that have failed or to print all test results from every test performed.
The Printer Port is a parallel interface and should be compatible with most parallel printers.
The printer port output uses simple ASCII characters and control codes. Simply connect the
printer to the instrument and configure the printer output using the Setup menu. The
following sections describe the setup procedures for configuring the printer output.
Auto Print
Please press the SETUP key to enter the Setup menu. Press the SETUP key four more times
to scroll to the Auto Print selection the screen will show:
AUTO Print = ON
<ENTER> to Select
AUTO Print = OFF
<ENTER> to Select
To configure Autoprinting press the ENTER key to change the selection. When Auto Print =
ON the printer output will generate data every time the test has completed, and will also enable
two other menus to configure the Print Mode and the Print Number. When Auto Print =
OFF the user must press the LOCAL/PRN key on the lower left section of the keypad to
generate printer output.
When the EXIT/PRINT key is pressed after the test is completed the printer output will be a
duplicate of the front panel LCD test results. This key should only be used to retrieve test
results after the test has been completed. Although the output will print the LCD screen
during a test, the actual elapsed test time may be effected when printing while the test is active.
Print Mode
Please press the SETUP key. This menu selection works in conjunction with Auto Print.
The Print Mode screen appears as follows:
Print Mode = All
<ENTER> to Select
Print Mode = Fail
<ENTER> to Select
The printer output will generate the 40 character LCD display test results when the test is
complete. This selection will determine when the 40-character output will print. When Print
Mode = All the printer output will print the test results from every test performed. When Print
63
Mode = Fail only the test that have failed will be printed. The Print Number or Serial
number will print for every test, followed by the appropriate test results depending on the Print
Mode that has been selected.
Print Number
Please press the SETUP key. This menu selection works in conjunction with Auto Print.
The Print Number screen appears as follows:
Print NO. = 0
Range : 0 - 9999
The print number is used to identify each test result. The number can be set to match the
exact serial number or some portion of actual serial number of the item under test or just used
as an identifier or tracking number. Type in the desired starting number in the range from 0
-9999. This number will increment as each test is performed. The next number that will be
used can be viewed from this menu at any time after a test has been completed. This number
is not save as part of the non-volatile memory setup parameters. Therefore each time the
power to the instrument is turned off, the number will be reset to 0.
Form Feed
Please press the SETUP key.
The Form Feed screen appears as follows:
Form Feed = ON
<ENTER> to Select
Print Mode = OFF
<ENTER> to Select
This command forces a form feed after each complete test sequence. When the form feed is
turned off the pages will break whenever the page is determined to be full by the printer.
Sample Printer Outputs
Sample printer output with the following setup:
Auto Print = ON and
Print Mode = All and
Print No. = 1000
64
NO. 1000
M 1 Pass
5.00KV
1.0s
0.000mA
NO. 1001
M 1 Hi-Limit
5.00KV
0.5s
10.21mA
NO. 1002
M 1 Pass
5.00KV
1.0s
0.000mA
NO. 1003
M 1 Pass
1.0s
5.00KV
0.000mA
Sample printer output of the same test results, but the
Print Mode = Fail. In this case the test number of every test is printed but fail result
details are printed only when a failure occurs.
NO. 1000
NO. 1001
M 1 Hi-Limit
5.00KV
0.5s
10.21mA
NO. 1002
NO. 1003
65
11. Calibration Procedure
This instrument has been fully calibrated at the factory in accordance to our published
specifications. It has been calibrated with standards traceable to CNLA. You will find in
this manual a copy of the "Certificate of Calibration". It is recommended that you have this
instrument re-calibrated and a safety check done at least once per year. EXTECH
recommends you use "Calibration Standards" that are CNLA traceable, or traceable to agencies
recognized by CNLA to keep this instrument within published specifications.
End user metrology standards or practices may vary. These metrology standards determine
the measurement uncertainty ratio of the calibration standards being used. Calibration
adjustments can only be made in the Calibration mode and calibration checks or verifications
can only be made while operating in Test mode.
11.1. Required Calibration Equipment
•
•
•
•
•
•
•
•
•
0 - 10 kV RMS AC and DC Voltage Divider. Voltage divider must handle 14.14kV peak.
7470, 20mA AC Ammeter.
7473, 10 mA AC Ammeter.
7472, 10mA DC Ammeter.
7474, 5mA DC Ammeter.
7470, 7472, 100KΩ, 20-watt resistor, 1000 volt.
7472, 7473, 100KΩ, 10-watt resistor, 1000 volt.
7474, 100KΩ, 2.5-watt resistor, 1000 volt.
7472,7474 1MΩ, 0.25-watt resistor, 300 volt
11.2. Calibration Initialization
Press and hold the calibration key on the rear panel with a pen, pencil, or small screwdriver
while powering ON the High Withstand Voltage Tester. The High Withstand Voltage Tester
enters calibration mode after the power on sequence is complete.
The program will automatically enter to the calibration mode and the display screen will show:
Calibration Mode
∨ : Forward ∧ : Backward
Use the ∨ (Forward) and ∧ (Backward) keys to move through the calibration menu.
following instructions follow the sequence scrolling forward through the menu.
The
11.3. Calibration Procedure
11.3.1. Calibration of Hipot Voltage
The first screen to appear in the Calibration mode is the Voltage calibration display. The
display will show:
ACW Voltage, 10KV
<T E S T>
to
Calibrate
66
or
DCW Voltage, 10KV
<T E S T>
to
Calibrate
Connect an AC standard voltage meter for 7470 and 7473 or a DC standard voltage meter for
7472 and 7474 which can measure up to 10KV to the output connectors and then press the
TEST button, the program will automatically generate an output of about 10KV and the display
will show:
HI-Voltage =
Enter Standard V-out
V
Use the Numeric keys to enter the standard value of voltage, unit V, and then press the ENTER
key to store the standard value of AC or DC hipot voltage for calibration and display will show:
ACW Voltage, 10KV
OK
<T E S T>
to
Calibrate
or
DCW Voltage, 10KV
OK
<T E S T>
to
Calibrate
11.3.2. Calibration of 7470 AC Hipot Current
AC Hipot, 20mA current range
Press the ∨ key, the program will advance to the AC 20.00mA range calibration of the hipot
test. The display will show:
AC 20.00mA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/40W in series with a AC standard Ammeter which can
measure up to 20.00mA to the output leads. The Ammeter should be connected to the return
lead, then press the TEST button, the program will automatically generate an output of about
2000V/20mA and the display will show:
Current
=
Enter Standard I-out
mA
Use the Numeric keys to enter the standard value of current, unit mA, and then press the
ENTER key to store the standard value of AC 20.00mA range for calibration and the display
will show:
AC 20mA, 100KΩ
<T E S T>
to
OK
Calibrate
AC Hipot, 3.500mA current range
Press the ∨ key, the program will advance to the AC 3.500mA range calibration of the hipot
test. The display will show:
AC 3.500mA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/40W in series with a AC standard Ammeter which can
measure up to 3.500mA to the output leads. The Ammeter should be connected to the return
67
lead, then press the TEST button, the program will automatically generate an output on the
output connectors about 300V/3.00mA and the display will show:
Current =
Enter Standard I-out
mA
Use the Numeric keys to enter the standard value of current, unit mA, and then press the
ENTER key to store the standard value of AC 3.500mA range of the hipot test and the display
will show:
AC 3.500mA, 100KΩ
OK
<T E S T>
to
Calibrate
11.3.3. Calibration of 7473 AC Hipot Current
AC Hipot, 10mA current range
Press the ∨ key, the program will advance to the AC 10.00mA range calibration of the hipot
test. The display will show:
AC 10.00mA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/10W in series with a AC standard Ammeter which can
measure up to 10.00mA to the output leads. The Ammeter should be connected to the return
lead, then press the TEST button, the program will automatically generate an output of about
1000V/10.00mA and the display will show:
Current
=
Enter Standard I-out
mA
Use the Numeric keys to enter the standard value of current, unit mA, and then press the
ENTER key to store the standard value of AC 10.00mA range for calibration and the display
will show:
AC 10mA, 100KΩ
<T E S T>
to
OK
Calibrate
AC Hipot, 3.500mA current range
Press the ∨ key, the program will advance to the AC 3.500mA range calibration of the hipot
test. The display will show:
AC 3.500mA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/10W in series with a AC standard Ammeter which can
measure up to 3.500mA to the output leads. The Ammeter should be connected to the return
68
lead, then press the TEST button, the program will automatically generate an output on the
output connectors about 350V/3.00mA and the display will show:
Current =
Enter Standard I-out
mA
Use the Numeric keys to enter the standard value of current, unit mA, and then press the
ENTER key to store the standard value of AC 3.500mA range of the hipot test and the display
will show:
AC 3.500mA, 100KΩ
OK
<T E S T>
to
Calibrate
11.3.4. Calibration of 7472 DC Hipot Current
DC Hipot, 10mA current range
Press the ∨ key, the program will advance to the DC 10.00mA range calibration of the hipot
test. The display will show:
DC 10.00mA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/10W in series with a DC standard Ammeter which can
measure up to 10.00mA to the output leads. The Ammeter should be connected to the return
lead, then press the TEST button, the program will automatically generate an output of about
1000V/10mA and the display will show:
Current
=
Enter Standard I-out
mA
Use the Numeric keys to enter the standard value of current, unit mA, and then press the
ENTER key to store the standard value of DC 10.00mA range for calibration and the display
will show:
DC 10.00mA, 100KΩ
OK
<T E S T>
to
Calibrate
DC Hipot, 3500µA current range
Press the ∨ key, the program will advance to the DC 3500µA range calibration of hipot test.
The display will show:
DC 3500µA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/10W in series with a DC standard Ammeter which can
measure up to 3500µA to the output leads. The Ammeter should be connected to the return
lead, then press the TEST button, the program will automatically generate an output of about
69
300V/3000µA and the display will show:
Current =
Enter Standard I-out
µA
Use the Numeric keys to enter the standard value of current, unit µA, and then press the
ENTER key to store the standard value of DC 3500µA range of hipot test and the display will
show:
DC 3500µA, 100KΩ
OK
<T E S T>
to
Calibrate
DC Hipot, 350µA current range
Press the ∨ key, the program will advance to the setting and reading of DC 350µA range
calibration of the hipot test. The display will show:
DC 350µA, 1MΩ
<T E S T>
to
Calibrate
Connect a resistor about 1MΩ/0.25W in series with a DC standard Ammeter which can
measure up to 300µA to the output leads. Connect the Ammeter to the return leads, then press
the TEST button, the program will automatically generate an output of about 300V/300µA and
the display will show:
Current =
Enter Standard I-out
µA
Use the Numeric keys to enter the standard value of current, unit µA, and then press the
ENTER key to store the standard value of DC 350µA range of the hipot test and the display
will show:
DC 350µA, 1MΩ
<T E S T>
to
OK
Calibrate
11.3.5. Calibration of 7474 DC Hipot Current
DC Hipot, 5.00mA current range
Press the ∨ key, the program will advance to the DC 5.00mA range calibration of the hipot test.
The display will show:
DC 5.00mA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/2.5W in series with a DC standard Ammeter which can
measure up to 5.00mA to the output leads. The Ammeter should be connected to the return
70
lead, then press the TEST button, the program will automatically generate an output of about
500V/5.00mA and the display will show:
Current
=
Enter Standard I-out
mA
Use the Numeric keys to enter the standard value of current, unit mA, and then press the
ENTER key to store the standard value of DC 5.00mA range for calibration and the display
will show:
DC 5.00mA, 100KΩ
OK
<T E S T>
to
Calibrate
DC Hipot, 3500µA current range
Press the ∨ key, the program will advance to the DC 3500µA range calibration of hipot test.
The display will show:
DC 3500µA, 100KΩ
<T E S T>
to
Calibrate
Connect a resistor about 100KΩ/2.5W in series with a DC standard Ammeter which can
measure up to 3000µA to the output leads. The Ammeter should be connected to the return
lead, then press the TEST button, the program will automatically generate an output of about
300V/3000µA and the display will show:
Current =
Enter Standard I-out
µA
Use the Numeric keys to enter the standard value of current, unit µA, and then press the
ENTER key to store the standard value of DC 3500µA range of hipot test and the display will
show:
DC 3500µA, 100KΩ
OK
<T E S T>
to
Calibrate
DC Hipot, 350µA current range
Press the ∨ key, the program will advance to the setting and reading of DC 350µA range
calibration of the hipot test. The display will show:
DC 350µA, 1MΩ
<T E S T>
to
Calibrate
Connect a resistor about 1MΩ/0.25W in series with a DC standard Ammeter which can
measure up to 300µA to the output leads. Connect the Ammeter to the return leads, then press
the TEST button, the program will automatically generate an output of about 300V/300µA and
71
the display will show:
Current =
Enter Standard I-out
µA
Use the Numeric keys to enter the standard value of current, unit µA, and then press the
ENTER key to store the standard value of DC 350µA range of the hipot test and the display
will show:
DC 350µA, 1MΩ
<T E S T>
to
OK
Calibrate
11.3.6. Calibration Complete Message
When a complete calibration of Hipot voltage and current has been performed, a message will
appear on the screen to confirm the calibration is finished The message will appear as follows:
Calibration
complete
72
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