Amprobe MEGATEST 5000 User manual

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MEGATEST 5000
5000 V MEGOHMMETER
Model#: AMB-5 KVD
Owner’s Manual

Cra 53 # 50-51 Locales 207-208 Pbx: (4)448 78 30 (4)512 78 30
Fax: [phone] e-mail: [email protected] www.suconel.com
Barranquilla: 301 362 59 81 Cartagena: 301 362 59 86

Cra 53 # 50-51 Locales 207-208 Pbx: (4)448 78 30 (4)512 78 30
Fax: [phone] e-mail: [email protected] www.suconel.com
Barranquilla: 301 362 59 81 Cartagena: 301 362 59 86
1. ACCIDENT PREVENTION AND SAFETY MEASURE S ........................................................................................ ............ 2
1.1 DURING USE ............................................................................................................................... ........................................ 2
1.2 A FTER USE ............................................................................................................................... ........................................... 3
2OV ER V I EW ....................................................................................................................... ........................................................ 4
2.1 PURPOSE OF T HE DEVICE ............................................................................................................................... ...................... 5
2.2 M EASURING PRINCIPLE ............................................................................................................................... ........................ 5
2.3 W HAT IS INS ULA TION RESISTANCE ............................................................................................................................... ....... 5
2.4 POSSIBLE FIELDS OF APPLICATION ............................................................................................................................... ........ 5
2.4.1 Other possible elds of employment............................................................................................ ........................... 6
2.5 U SE OF TH E GU A R D ............................................................................................................................... .............................. 6
2.6 N OTES O N INSUL A TION MEASURE MENTS .............................................................................................................................. 7
3PR EPA R I NG THE I NST R UMEN T FOR U SE............................................................................................... ........................ 8
3.1 I NITIAL CHECKS ............................................................................................................................... ................................... 8
3.2 POW ER SUPPLY FOR THE INSTRUM E NT ............................................................................................................................... .. 8
3.3 S TORAG E ............................................................................................................................... ............................................. 8
4WORKING IN STRUCT IO NS ........................................................................................................... ....................................... 9
4.1 DESCRIPTION OF THE INSTRUMENT ............................................................................................................................... ....... 9
4.2 DISPLAY ............................................................................................................................... ............................................ 10
4.3 K EYBOARD ............................................................................................................................... ........................................ 11
4.4 S UMMARY OF TH E MEASURING MO DES .............................................................................................................................. 12
4.4.1 Factory-set configurations..................................................................................................... ............................... 13
4.4.2 Pr eviously memorised configurations............................................................................................ ....................... 14
4.4.3 Extemporaneousinstrument conguration........................................................................................ ................... 14
4.5 I NSTRUMENT CO NFIGURATION AN D MEASUREMENT PERFORMANCE ................................................................................... 15
4.5.1 Measurement preparation selection.............................................................................................. ........................ 15
4.5.2 MAN M ode....................................................................................................................... ..................................... 15
4.5.3 AUTO Mode...................................................................................................................... .................................... 15
4.5.4 TIMER Mode..................................................................................................................... ................................... 16
4.5.5 PRO GR Mode..................................................................................................................... .................................. 16
4.5.6 Measurement ofpolarization index.............................................................................................. ......................... 17
4.6 E XAMPLES OF IN SULATION ME ASU R EMENT ........................................................................................................................ 19
4.6.1 Measuring theinsulation of the windingsof an electrical machine.............................................................. ........ 19
4.6.2 Measuring on a powerplant..................................................................................................... ............................ 20
4.6.3 Checking the eiciency of an insulator ........................................................................................ ......................... 20
4.6.4 Estimatingtheinsulating strength ............................................................................................. ........................... 21
4.7 SAVING THE ME A SUREMENTS W HI CH WERE PERFOR MED .................................................................................................... 22
4.8 R ECALLING MEM ORISED MEASURE MENTS .......................................................................................................................... 22
4.9 PR IN TIN G OUT M E M ORIS E D M E A SUR EMEN TS ........................................................................................ ........... 22
4.10 DELETIN G MEMO RISED MEMORIES ............................................................................................................................... ...... 23
4.11 R ESTORING T HE I NITIAL CONFIGUR ATION .......................................................................................................................... 23
4.12 E RROR CODE DES CRIPTION ............................................................................................................................... ................. 23
4.13 U SE OF THE SERI AL PORT ............................................................................................................................... .................... 24
4.13.1 Readingand downloading the results ofthe measurementson a computer.......................................................... 24
5MA I NTEN ANC E .................................................................................................................... ................................................. 25
5.1 R EPLACING T HE BATTERIES ............................................................................................................................... ................ 25
5.2 C LEANING THE INSTRUMENT ............................................................................................................................... .............. 25
6TEC HN I C A L S P EC I F I C A T ION S ....................................................................................................... .................................. 26
6.1 T ECHNICAL FEAT URES ............................................................................................................................... ....................... 26
6.1.1 Measuring theinsulation. ...................................................................................................... ............................... 26
6.1.2 Current whichcan be delivered................................................................................................. ........................... 26
6.1.3 Voltagemeasurement............................................................................................................ ................................ 26
6.1.4 Safety ......................................................................................................................... ........................................... 26
6.2 G ENERAL FEATU R ES ............................................................................................................................... .......................... 27
6.2.1 Electric features.............................................................................................................. ...................................... 27
6.2.2 Safety ......................................................................................................................... ........................................... 27
6.2.3 Mechanical features............................................................................................................ .................................. 27
6.2.4 Power supply................................................................................................................... ..................................... 27
6.2.5 Display........................................................................................................................ .......................................... 27
6.3 A MBIENT CONDI TIONS ............................................................................................................................... ....................... 27
6.3.1 Ambientconditions of use...................................................................................................... ............................... 27
6.3.2 EMC ............................................................................................................................ .......................................... 27
6.4 S TAND ARD EQ UI PMENT ............................................................................................................................... ...................... 28
6.5 R EPLACEMENT P A RTS ............................................................................................................................... ........................ 28
7WARRANTY CO NDITION S ............................................................................................................ ..................................... 29
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1. Accident prevention and safety measures
Please read and understand these instruct ions BEFORE using the AMB-5KV-D.
This instrument can gener ate dangerously high voltages.
Only specialised personnel, well trained about electricity and its eects must use it.
When testing, the following is important:
• DO NOT TAKE MEASUREMENT S IN AN EXPLOSIVE ATMOSPHER E. i.e. GAS,
FUEL S OR DUST.
• Do not take measurements in wet environments
• Do not touch expos ed metal parts; i.e. alligat or clips, ends of test leads, circuits, etc.,
while taking measurements
• Prevent any accidental contact of yourse lf or others with t he measuring voltage.
• Make sure the test voltage does not dam age any component unable to withstand it.
The following symbols have been used in this manual:
o
Warning: comply with the instructions in the manual. Any improper use could
damage the instrument, t he equipment being test ed or cause personnel
injury.
p
Danger High Voltage.
t
Instrument with double insulation.
1.1 During use
Following are two general guidelines for setti ng up the tests. These must be i ntegrated
from time to time with a detailed analys is depending on the act ual circumstances.
While measuring on equipment:
- Seal o the testing area and do not allow other people to approach it. If
necessary, put up a sign.
- Have enough room available, plus pr operly insulated tables or supports.
- Take note of which parts could be live should there be defective insulation.
- Keep the area and the measuring cables cl ean from dust, oil or other foreign
matter.
- On a routine basis, check for any abrasion or breakage on the measuring
cables.
- Never exceed the maximum testing voltage for which the tested device was built
and/or rated.
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When measuring insulation:
- Cut power o from the installati on before preparing for the tests.
- Seal o the testing area and do not allo w other people to approach it throughout
the duration of the tests.
- Seal o the installation being tested, di sconnecting those branches of it which
are not involved in the test.
- When measuring a section, make sure t he test leads are at least 1 “ (25 mm)
apart in order to avoid disc harges or unwanted coupling.
- Isolate areas not involved, so unwanted voltages do not reach them.
- Take note of which parts could be live should there be defective insulation.
- Never exceed the maximum insulation volt age the installation was built for.
- Disconnect from the installation any equi pment (transformers, bells, intercom
systems, antenna systems, pump s , timers, lights…) which might be damaged by
the measuring or might make it less reliable.
WARNING
p
Danger due to capacitance. Measuring over a very large installation or on
condenser s can lead to a dangerous accumulation of power. Always wait for
the voltage to go back to zero befor e disconnecting the instrument.
1.2 After use
• Once measuring has been completed, press t he OFF key to turn the instrument o.
• If you expect not to use the in strument for a l ong period of time, take the batteries out.

Cra 53 # 50-51 Locales 207-208 Pbx: (4)448 78 30 (4)512 78 30
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2 Overview
Thank you for purchasing one of our instruments ,we are a leading company in the eld of
electrical measuring equipment.
Amprobe has been in the marketplace for over 50 years, and intends to satisfy our
customers’ requirements by providing in creas ingly reliable and innovative products.
The AMB-5KV-D “MEGATEST 5000” is fo r demanding and professi onal customers who
are looking for increasingly accur ate INSULATION me asurements.
It provides exible measuring, easy progr amming and accuracy. It can measure up to
5000V while keeping c ontrol of every factor involved (in sulation res istance, voltage and
measuring time).
This instrument has been made according to t he strictest rules on safety, using top quality
material and technical methods.
No eort has been spared to create a produc t that can adapt to changing standards and
regulations in the eld of insulation measurem ent. That is why this in strument will be in the
forefront for years to c ome.
This manual contains all t he information needed to use the instrument correctl y. It also
points out the dangers due to its i mproper use, specifying the precautions to be taken in
order to ensure the safety of the user, the instrument and the equipment being tested.

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2.1 Purpose o f the device
This instrument can be used to measure the insulation of installations, equipment,
insulating material and so on.
Testing must be performed with no other vo ltage present, and after having disc onnected
the parts not being measured or which are unable to withstand the testing voltage.
This instrument is a lso ab le to measure the voltag e present before the test, to display it
and to inhibit starting up of t he measurement in case the tested element should be liv e.
The pre-set measures are, in most cases, sucient for using the ins trument without any
additional programming, employ ing the settings that were prepared at the factory.
2.2 Measuring principle
The instrument applies the requested voltage to the object being tested (material or
equipment or installation), meas ures the circulating current and calculates the relevant
insulation resistance.
While measuring, the instrument simult aneously detects and displays the resistance,
making it possible to calculat e its variation through time.
In certain situations (e.g. very large electric al installations or measures on condensers),
there can be a stray capacity para llel to the resistance to be measured. This stray capacity
is due to the presence of conductors running next to each other, and can sometimes be
quite high. In such a case, the value of the resistance displayed can start out from a very
low value and reach - i n no short time - the real value of the insulation resistance.
In this cas e, therefore, the measurement is deemed to have been co mpleted only when
the display ed resistance value stabilises at less than a certain tolerance (normally 10%).
2.3 What is insulation resistance
We are us ed to thinking of insulation as a to tal inhibition of the passage of electrical
current. Thi s approxim ation is valid in most cases.
Howev er, when we have to measure an insula tion resistance, this approximation no lon ger
holds true: we can imagine an in hibition that is not total, but simply very great.
Insulation is known to depend on t he physical features of the ma terial inv olved and on its
dimension, and from an el ectrical point of view app ears as a resistance, of course of a
very high value. The higher the resi stance the better the insulation.
Every kind of material has its maximum per missible volt age, depending on its thickness.
When this value is exceeded, the insulation may be perforated (discharge). This voltage
value is called insulating strengt h, and its value is alway s rela ted to the thickness of the
material. When measuring insulation, one mu st never exceed the maximum permissible
voltage (ins ulating strength x thick ness of the mate rial) since it can lead to deterioration of
the materia l (perforatio n).
2.4 Possible elds of application
This instrument is most frequently used to make sure the insulation of electrical
installations or equipment complies with the relevant regulations.
Measurements taken in the "PROGR" mode ma ke it possible to increase the voltage
slowly. This way the eciency of an insulator can be chec ked out, the insulation
resistance should stay more or less the sam e even when the v oltage is increased. Should
the resistance diminis h as the voltage is increas ed, this will mean that the insulator is no t a
good quality one. Continuing the test mi ght lead to an elect ric dischar ge and the
perforation of the material.

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When the meter is in i ts "TIMER" mode, set a dur ation of 10’ to determine the eciency of
an insulator at a certai n voltage. During the test, insulat ion resistance may diminish,
remain steady or increase. Diminishing resi stance means insulation is not good. On the
contrary, the more the resistance in creases the better the insulation.
This instrument can also be used in a labor atory, and without regard for legal regulations,
in order to establish the eciency of elec tronic equipment, installations or boards. This
kind of use, however, requires further technical skills so as not to damage the device being
tested.
2.4.1 Other possible  elds of employ ment
In the eld of automobiles, th is instrument can be used to check the eciency of the
battery ignition, spark plug cables or spar k plugs without having to dismantle parts in
dicult locations.
Sparking promptness measurement in heating pla nts: a spark is generated in order to start
combustion in gas and Diesel fuel systems. As time passe s, the s park gener ator - just like
the spark plug in a c ar - loses its eci ency and spark generation becomes increasing ly
dicult.
A diagnosis can be performed by measuring t he insulation of the el ectrode that launches
the spark. If insulation is poor , then it will be necessary to r eplace the electrod e. If the
insulation is good, then it will be necessary to check the generator creating it.
Measuring insulation eciency for manufacture rs of transformers or electric motors.
The quality of the insulation can be monitored in order to take countermeasures in case of
deterioration, before the quality go es below the acceptable level.
2.5 Use of the guard
In certain cases, surfa ce curr ents may falsify the measurement.
Application of a voltage to an insulator that you want to measure can create two dierent
currents: one owing inside t he specimen, the other moving acr oss its surface. They are
parallel. If you want to measure only the resi stance due to the current owing ins ide the
specimen (which is the meaningf ul resistanc e), you will have to use another wire to abs orb
the surface current (see gure).
)-()+(
DRAUG
Measurement current
Surface leak current
Since the voltage between the GUARD and (-) is very lo w, only those currents indicated
above will circulate.

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2.6 Notes on insulation measurem ents
Measurement of such a high re s istance as insulation r esistance is very critical, since t he
currents involved are minute, even lower than those circulating inside our nervous syste m.
When performing measurements, in order to avoid making mistakes take the following
precautions:
• Keep the measuring c ables suspended in the ai r, or at most rest ing on one point only.
• The area surrounding the meas uring equipment and the equi pment being tested must
be free of any object.
• Nobody must circulate near the cables or the resistance being measured.
• The operator must not move and, especia lly, must not mo ve his/her arms.
These precautions are especially important when meas uring resistances high er than
50G Ω.
Such precautions are required because any kind of movement leads to capacity variations
that introduce themselves par allel to the resistance being measured. Each capacity
variation im plies a variation of the electrical charge; if the capacities are very small, then
the relevant currents will inte rfere with the equally small ones circulating in the test
specimen.
We advise you always to use the Guard terminal.
Even the presence of air currents can a ect the results of the measurement.
The diagram below shows the stray resistance due to air conductio n and the stray
capacitanc e, Sc, present between the operator and the measuring circuit.
Sc
INSTRUM ENT
RESIST ANCE
BEING MEASURED

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3 Preparing the instrument for use
3.1 Initial checks
Before being shipped, the instrument is che cked from an electrical and a mechanical point
of view.
Every precaution has been taken so the inst rument can be deliver ed without damage.
Howev er the user is advised to look the instru ment over quickly in or der to check for any
damage during shipm ent. In case of any fa ult, contact the forwarding agent at once.
We also suggest making sure that the packa ge contains every part listed under heading
6.4. In case of any di screpancy, contact the dealer.
Should it be necessary to re turn the instrument, please fo llow the instructions under the
heading 7.
3.2 Pow er suppl y for the instrument
The instrument is fed by 4 each, 1.5 volt, “D” size alkaline batteries (not included)
Endurance with new batteries is as follows:
250 measurements V = 5000 V Rx = 5 M Ω (minimum) t = 1 min.
450 measurements V = 500 V Rx = 500 k Ω (minimum) t = 1 min.
Before measuring, make sure that the "low battery” indicator is not lit (chap. 4.2, symbol
4).
When the "low battery” indicator is lit, meas urements can still be pe rformed, but with very
low resistance, it might not be possible to reach the rated voltage, and the measurement
would not be valid.
3.3 Storage
If the instrument has been kept in a co ld environment and the measurement must be
performed i n a warm place, the sharp change in temperature would make humidity
condense and this would fa lsify the measurement.
In this cas e, 15 min. must be allowed for t he instrument to stabilis e its te mperature and
allow the condensatio n to evaporate.

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4 Working instructions
4.1 Description of the instrument
Legend:
1. Instrument ON/OFF switch.
2. Negative high voltage jack.
3. GUARD jack.
4. Positive high voltage jack.
5. An example of measurement connection using the GUARD.
6. Measuring range graph.
7. Display.
8. An example of measurement co nnection without using the GUARD.
9. Keyboard.
10. Serial port connector RS 232.
Note: On the front of the instrument, under the handle, there is a “purge” knob.
This knob c an be opened to vent the case to assist in the openin g of the case
following a high altitude ight.
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4.2 Display
Legend:
1. "Measuring underway" indicators. When  ashing: voltage delivery; when xed ON:
circuit discharge.
2. "Measured value" indic ator or indication of the current parame ter memory number.
3. Unit of measure.
4. "Low Battery” indicator.
5. "Current measuring mode" indicator.
6. "Current RS 232 connection" indicator.
7. "Printing underway" indicator.
8. Remote control performance indicator.
9. "AUTO measure mode" indica tor (lit during measuring).
10.Voltage indicator:
• Before measuring, this displa ys the voltage at the test l eads.
• While measuring, the deliv ered voltage is displayed.
11. Measuring time indicator in TIME R or PROGR. mode.
12. Indicator of the polarit y of the voltage being read.
13. This indicates the voltage parameter V2.
14. This indicates the voltage parameter V1.
15. This indicates the time parameter T1.
16. This indicates the time parameter T2.
17.Bar graph.
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4.3 Keyboard
Legend:
1. Decrease key This modies the voltage or time setting.
This displays the locations of the measurement models.
2. Increase key This displays t he saved performed measurements.
}
3. Conrmation or end of current operation.
4. Choos ing the mode (MAN / AUTO / TIMER / PROGR) or deletion procedure.
5. Recalling stored measurements.
6. Saving the measurement par ameters, the meas urements that were performed and
printing out the measurements in the memory (from the disp layed number to the last
one).
7. Starting up or stoppi ng the measurement.
8. Turning the instrument on after automatic tur n-o.
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4.4 Summar y of the mea s uring modes
The instrument was designed for simple progr amming, so as to cut down the time needed
to prepare measuring.
The instrument is equipped with 25 memory locations (parameters – P) for storing the
various ways of measuring:
C onfiguration F actory setting Modiable
P01 - P19 Yes yes
P20 - P25 Yes no
Each conguration can be reac hed both by the increas e and by the diminis h key, as these
work in a circular fashion: decreasing from P 01 leads to P25, increa sing from P25 leads t o
P01. This makes it possible to reach the location of interest as soon as possible.
The purpos e of the pre-set conf igurations is to allow per formance of measures without
wasting time in setting up.
The purpos e of the non-modiable congurat ions is that of making the most common
insulation measurement types constantly available.
Description of the m easuring parameters
• Voltage V2: Final voltage value wanted for test performance.
• Time T2: Duration time for voltage V2.
• Voltage V1: Starting voltage during m easuring (only in PROGR mode).
• Time T1: The time for the output voltage to rise from the voltage value V1 to
the value V2 (only in PROGR mode).
This instrument is designed for use in a si mple and int uitive manner, and provides the
following possibilities:
- Direct use of the factory-set con gurations for the most frequent cases.
- Direct use of previously set congurations.
- Extemporaneous congurat ions when the measurement is not included among
those already present.
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4.4.1 Factor y-set congurations
Following are the keyboar d sequences for obtaining the conf igurations, with the instrument
at rest, starting from programme P01
P n. Key board sequence Parameters Kind of
test
P25 once the Diminish key, twice the St art key 500 1’ (minute) Timer
P24 twice the Diminish key , twice the Start key 1000 1’ (minute) Timer
P23 3 times the Diminish k ey, twice the Start key 2500 1’ (minute) Timer
P22 4 times the Diminish k ey, twice the Start key 5000 1’ (minute) Timer
P21 5 times the Diminish k ey, twice th e Start key 5000 2’ (minutes) Timer
P20 6 times the Diminish k ey, twice the Start key 2500 10’ (minutes) Timer
P5-19 N times the Increase key, twice the Start key 500 Manual
P04 3 times the Increase key, twice the Start key 5000 Manual
P03 twice the Increase key, twice the Start key 2500 Manual
P02 once the Increase key, t wice the Start key 1000 Manual
P01 Twice the Start key 500 Manual

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4.4.2 Previousl y memorised congurations
When performing the same meas urements on the same kind of equipment, a measuring
conguration can be memorised for eac h usual situation, for example:
• P01 Measuring on A-type product.
• P02 Measuring on B-type product.
• P03 Measuring on C-type product.
The meas uring congurations can als o be div ided up into groups used by dierent
operators. E.g.:
• P01 - P05 Measurements usually performed by operator 1
• P06 - P10 Measurements usually performed by operator 2
• P11 - P15 Measurements usually performed by operator 3
In each case, all that is required is for th e operator to use the arrow keys to go to t he
desired conguration and then to press Start to begin measuring.
4.4.3 Extemporaneous instrument c onguration
Select a conguration and modify it as descri bed under Section 4.5, Ins trument
Conguration and Measurem ent Perform ance , then use the Start ke y to run i t. If the
modied co nguration is not sa ved, it will stay active only until a new selection is made or
the instrum ent is turne d o.

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4.5 Instrument conguration and measurem ent performance
Following is a description of the par ameters and way the values are set.
4.5.1 Measurement preparation selection
To prepare the measurement, press the incr ease or decrease key to run through the
memories until reaching the location you in tend to introduce the conguration into.
NOTICE
Memorisation is possible only from cell P01 to cell P19.
4.5.2 MAN Mode
KEY OPERATI ON
Reach the memory cell you are interested in.
ModE Press the MODE key repeatedly to display the MAN measuring mode.
SeT The V2 parameter indicator is ashing.
Set the V2 voltage value you want (testi ng voltage). The top secondary
display (item 10 par. 4.2) will sho w the value you are setting.
SeT Exit the programming phase. The ashi ng measuring mode advises you that
you can save the setti ngs.
SavE Saving the parameters in the location rst selected (if requested).
StarT “Go?” prompt displayed, PRESS ST ART again and HOLD DO WN UNTIL
READING STABILISES.
AUTO
MAN
4.5.3 AUTO Mode
KEY OPERATI ON
Reach the memory cell you are interested in.
ModE Press the MODE key repeatedly to display the AUTO measuring mode.
SeT The V2 parameter indicator is ashing.
Set the V2 voltage value you want (testing voltage). The top secondary
display (item 10 par. 4.2) will sho w the value you are setting.
SeT Exit the programming phase. The ashi ng measuring mode advises you that
you can save the setti ngs.
SavE Saving the parameters in the location rst selected (if requested).
StarT “Go ?” prompt displayed, PRESS START again to start measuring.

Cra 53 # 50-51 Locales 207-208 Pbx: (4)448 78 30 (4)512 78 30
Fax: [phone] e-mail: [email protected] www.suconel.com
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4.5.4 TIMER Mode
KEY OPERATI ON
Reach the memory cell you are interested in.
ModE Press the MODE key repeatedly to display the TIMER measuring mode.
SeT The V2 parameter indicator is ashing.
Set the V2 voltage value you want (testing voltage). The top secondary (item
10 par. 4.2) will d isplay the value you are setting.
SeT The T2 parameter indicator is ashing.
Set the T2 time value (duration of the measurement). The bottom secondar y
display (item 11 par. 4.2) will sh ow the value you are setting. The shortest
time that can be set is 15” (seconds).
SeT Exit the programming phase. The ashi ng measuring mode advises you that
you can save the setti ngs.
SavE Saving the parameters in the location rst selected (if requested).
StarT “Go ?” prompt displayed, PRESS START again to start measuring.
PROGR
TIMER
4.5.5 PROGR Mode
KEY OPERATI ON
Reach the memory cell you are interested in.
ModE Press the MODE key repeatedly to display the PROGR measuring mode.
SeT The V2 parameter indicator is ashing.
Set the V2 voltage value you want (testing voltage). The top secondary
display (item 10 par. 4.2) will sho w the value you are setting.
SeT The T2 parameter indicator is ashing.
Set the T2 time value (duration of the measurement). The bottom secondar y
display (item 11 par. 4.2) will sh ow the value you are setting. The shortest
time that can be set is 15” (seconds).
SeT The V1 parameter indicator is ashing.

Cra 53 # 50-51 Locales 207-208 Pbx: (4)448 78 30 (4)512 78 30
Fax: [phone] e-mail: [email protected] www.suconel.com
Barranquilla: 301 362 59 81 Cartagena: 301 362 59 86
Set the V1 voltage val ue you want (testing start voltage). The top secondary
display (item 10 par. 4.2) will sho w the value you are setting.
NOTE: The value of V1 CANNOT be greater than that of V2.
SeT The T1 parameter indicator is ashing.
Set the T1 time value (duration of t he rising voltage ramp from value V1 t o
value V2). The bottom secondary displa y (item 11 par. 4.2) will show the
value you are setting. The shortest ti me that can be set is 15” (seconds).
SeT Exit the programming phase. The ashi ng measuring mode advises you that
you can save the setti ngs.
SavE Saving the parameters in the location rst selected (if requested).
StarT “Go ?” prompt displayed, PRESS START again to start measuring.
4.5.6 Measurement of polarization index
PI
Insu la tor
MEGA EST T
5000
It’s common knowledge that a good insulator, if subject to voltage, shows a gradual
resistance increase ov er a period of time. Vice versa, a resistance decrease indicates bad
quality of the insulator (or presence of dirt aecting the measurement).
The polariz ation index is dened as the rati o between the resistance value measured after
10 minutes and the resistance value measured afte r 1 minute from application of the test
voltage. Therefore it’s an important indicator of the insula tor quality. Indicative information
about the insulator features, but not so accurate as the polarization i ndex, are provided by
the ratio between the resistance value meas ured after 60 seconds and the resistanc e
value measured after 30 seconds. Already afte r one minute it’s possible t o verify if the
resistance value has c onsiderab ly increased (as hoped) or, on the c ontrary, it’s unchange d
or, still worse, it has decreased.

Cra 53 # 50-51 Locales 207-208 Pbx: (4)448 78 30 (4)512 78 30
Fax: [phone] e-mail: [email protected] www.suconel.com
Barranquilla: 301 362 59 81 Cartagena: 301 362 59 86
This meas uring method, based on resistanc e ratios, gives a dimensionless res ult,
independent on a seri es of factors such us equipment size, temperat ure or environme ntal
conditions.
Insulator status 60/30 sec ratio Polarization index
10/1 min ratio
dangerous  less than 1
questionable 1.0 ÷1.25 1.0 ÷2
good 1.4 ÷1.6 2 ÷4
excellent more than 1.6 more than 4
Tab. 1: Insulator status as re vealed by the polar ization index.
The measurement of the polariz ation index of a dielect ric can be taken by manufacturers
of electrical equipment to te st, for example, materials to be used for the production of
supports for conductors, components and devices, ins ulation of motor coils.
KEY OPERATI ON
Reach the memory cell P20. PI is displayed.
SeT The V2 parameter indicator is ashing.
Set the desired V2 voltage value (test voltage) between 100 and 5000V. Th e
top secondary display will show the value you are setting.
SeT The T2 parameter indicator is ashing.
SeT Leave the programming phas e. The ashing measuring mode TIMER
advises that you can save the settings.
SavE Save the parameters i n the location previously selected (if requested).
StarT The message “ go? ” is displayed.
StarT The measurement is started.
• The test can be interrupted at any time (p rovided that at least 75 seconds hav e pass ed
from starting).
• At the end of the meas urement the PI value is display ed. Press MODE to display the
last resistance value measured.
• Press SAVE to store the measured values.
• It’s possible to recall t he measur ed values. Press SET/EXIT to ru n over the PI values,
the resistance values and t he measuring par ameters.