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Kyoritsu Electrical Instruments
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3121B
User manual
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Kyoritsu Electrical Instruments 3122B, 3121B User manual

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Instruction manual
High voltage insulation resistance tester
KEW3121B/3122B
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Contents
3. Specication ........................................................................ 6
6. Measurement ..................................................................... 11
6-1 Insulation resistance measurement ............................. 11
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1. Safety warnings
○ This instrument has been designed, manufactured and tested
according to IEC 61010: Safety requirements for Electronic Measuring apparatus, and delivered in the best condition after passing quality control tests. This instruction manual contains warnings and safety rules which must be observed by the user to ensure safe operation of the instrument and to maintain it in safe condition. Therefore, read through these operating instructions before using the instrument.
# WARNING
● Read through and understand instructions contained in this manual before starting to use the instrument.
● Keep the manual at hand to enable quick reference whenever
necessary.
● The instrument is to be used only in its intended applications.
● Understand and follow all the safety instructions contained in the manual. It is essential that the above instructions are adhered to.
Failure to follow the above instructions may cause injury,
instrument damage and/or damage to equipment under test.
○ The symbol # indicated on the instrument means that the user
must refer to the related parts in the manual for safe operation of the instrument. It is essential to read the instructions wherever the symbol # appears in the manual.
# DANGER is reserved for conditions and actions that are
likely to cause serious or fatal injury.
# WARNING i s reserved for conditions and actions that can
cause serious or fatal injury.
# CAUTION is reserved for conditions and actions that can
cause injury or instrument damage.
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● Do not use this instrument to test the circuits in which 300V or higher potentials exist in Measurement category IV (CAT IV) environment or 600V or higher potentials exist in CAT III environment.
● Do not attempt to make measurements in the presence of ammable gasses. Otherwise, the use of the instrument may cause sparking, which can lead to an explosion.
● Never attempt to use the instrument if its surface or your
hand is wet.
● Be careful not to short-circuit the power line with the metal part of the test leads when measuring a voltage. It may cause personal injury.
● Do not exceed the maximum allowable input of any measuring
ranges.
● Do not press the Test button when connecting the test leads to the instrument.
● Never open the Battery compartment cover during a
measurement.
● To prevent possible electrical shock, do not touch the circuit under test during an insulation resistance measurement or
right after a measurement.
# DANGER
● Never attempt to make any measurements if any abnormal conditions such as broken case and exposed metal parts are noted.
● Do not rotate the Function switch with the test leads connected to the object under test.
● Do not install substitute parts or make any modications to the instrument. Return the instrument to your local KYORITSU distributor for repair or re-calibration.
● Do not try to replace the batteries if the surface of the
instrument is wet.
● Insert the plug into the terminal rmly when using test leads.
● Ensure that the instrument is switched off before opening the Battery compartment cover for battery replacement.
# WARNING
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# CAUTION
● Before starting a measurement, conrm that the Function switch is at an appropriate position.
● Set the Function switch to “OFF” position after use. Remove the batteries if the instrument is to be stored and will not be in use for a long period.
● Do not expose the instrument to direct sunlight, high tempera­tures and humidity or dew.
● Use a damp cloth with alcohol for cleaning the instrument and the areas around the measuring terminals.
● When this instrument is wet, please store it after it dries.
Symbols
Danger of possible electric shock
Instrument with double or reinforced insulation
User must refer to the manual
#
DC
AC
Earth terminal
Crossed-out wheel bin symbol (according to WEEE Directive: 2002/96/EC) indicating that this electrical product may not be treated as household waste, but that it must be collected and treated separately.
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○ Measurement categories (Over-voltage categories)
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as O to CAT IV, and called measurement categories. Higher-numbered categories correspond to electrical environments with greater momentary energy, so a measuring instrument designed for CAT III environments can endure greater momentary energy than one designed for CAT II.
O : Circuits which are not directly connected to the mains
power supply.
CAT II : Electrical circuits of equipment connected to an AC
electrical outlet by a power cord.
CAT III : Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the distribution panel to outlets.
CAT IV : The circuit from the service drop to the service
entrance, and to the power meter and primary overcurrent protection device (distribution panel).
O: Device which is not directly connected to the mains power supply
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2. Features
KEW3121B (2500V/100GΩ) and KEW3122B (5000V/200GΩ) are battery-operated high voltage insulation testers.
● Designed to meet the following safety standards: IEC 61010-1,-2-030 (CAT III 600V/CAT IV 300V Pollution
degree 2)
IEC 61010-031 (Requirements for hand-held probes)
● Suited for heavy duty electrical maintenance and servicing ondustrial installations, cables, transformers, generators and switchgear where high voltage insulation tests are required.
● Dual scales for low an d high ranges which change automatically.
Colour coded scales for easy reading plus LED's that illuminate
in matching colour.
● Hard carrying case furnished as standard accessory. Houses both instrument and test leads in compact form. Made of plastic, it is highly water resistant.
● Rated output voltage is maintained down to 0.1GΩ for KEW3121B, 0.2GΩ for KEW 3122B. This permits accurate measurements of low insulation resistance.
●
Audible high voltage warning at insulation resistance measurement
● Optional adapter MODEL8324 is available for connection to recorder and enables cable insulation monitoring.(Option)
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3. Specification
● Applicable standards
IEC 61010-1,-2-030 Measurement CAT III 600V Pollution degree2 Measurement CAT IV 300V Pollution degree2 IEC 61010-031 Standard for hand-held probes MODEL7165A(CAT IV 600V) MODEL7264(CAT IV 600V) MODEL7265(CAT IV 600V) * When KEW3121B/3122B and the test lead
IEC 61326-1,-2-2 EMC standard IEC 60529 IP40 EN 50581 RoHS Directive
● Measuring range and accuracy
Model KEW3121B KEW3122B Rated voltage 2500V 5000V
Measuring range
Temperature:
23ºC±5ºC
Temperature:
-10ºC to +40ºC
Output voltage
are combined and used together, whichever is lower category either of them belongs to is
applied.
0 - 2GΩ/ 1 - 100GΩ (Automatic change)
First effective
measuring range
Accuracy ±5% of indicated value Second effective
measuring range
Accuracy First effective
measuring range
Accuracy ±10% of indicated value Second effective
measuring range
Accuracy ±20% of indicated value or 1.0% of scale length
0.1 - 50GΩ 0.2 - 100GΩ
Measuring ranges other than listed above , 0 and ∞
±10% of indicated value or 0.5% of scale length
0.1 - 50GΩ 0.2 - 100GΩ
Measuring ranges other than listed above , 0 and ∞
DC 2500V±5%
(0.1 - 50GΩ)
0 - 5GΩ/ 2 - 200GΩ (Automatic change)
DC 5000V±5%
(0.2 - 100GΩ)
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●Altitude : 2000m or less
●Temperature & humidity range(guaranteed accuracy)
:
●Operating temperature & humidity range
:
●Storage temperature & humidity range
:
●Overload protection :
●Withstand voltage : AC5160V(50/60Hz)/ 5 sec.
(Between electrical circuit and enclosure)
●Insulation resistance : 1000MΩ or more/DC1000V
(Between electrical circuit and enclosure)
●Dimension : 177(L)×226(W)×100(D)mm
●Weight :
●Power source :
●
●Measurement time : 3121B:approx. 55 hours
* under a load of 50MΩ on the Insulation
3122B:approx. 40hours * under a load of 100MΩ on the Insulation
23ºC±5ºC/Relative humidity 85% or less (no condensation)
-10ºC to +40ºC/Relative humidity 85% or less (no condensation)
-20ºC to +60ºC/Relative humidity 75% or less (no condensation) Insulation resistance range: AC720V/10sec.
KEW3121B approx. 1.6kg (battery included) KEW3122B approx. 1.7kg(battery included) DC12V LR14(Alkaline battery size C)x 8pcs
Current consumption (representative values at supply voltage 12V)
Model KEW3121B KEW3122B
Rated voltage 2500V 5000V
Short-circuit current 65mA 82mA
Max. current consumption
Output at
open circuit
80mA
/50MΩ
70mA 85mA
resistance 2500V range.
resistance 5000V range.
100mA
/100MΩ
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●Accessories : Line probe: MODEL 7165A (Including MODEL8255 Straight type prod
with molded parts) Earth cord: MODEL 7264 Guard cord: MODEL 7265 LR14(Alkaline battery size C)x 8pcs Instruction manual Hard Case: MODEL 9179 Pickel Type Prod: MODEL 8019 Straight Type Prod: MODEL 8254
●Optional : Adaptor for recorder:MODEL8324 accessories 3m Line probe with alligator clip: MODEL7168A 15m Line probe with alligator clip: MODEL7253
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4. Instrument layout
1 4 8 9 1023
5 7 6
1 Line terminal
2 Guard terminal
3 Earth terminal 4 LED for high & low range indication 5 PRESS TO TEST button 6 Function switch 7 Meter movement zero adjust 8 Guard cord (green) 9 Earth cord (black) 10 Line probe
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5. Getting started
● Be careful. High voltage may present across LINE and EARTH terminals of the instrument when the PRESS TO TEST button is operated. Make sure to connect the Earth terminals of the circuit under test and of this instrument to earth. The buzzer sounds continuously while measuring insulation resistance.
5-1 Mechanical Zero Adjustment
Set the Function switch to “OFF” position. Adjust the Meter
movement zero adjust located at the center of the Front panel with a screwdriver so that the pointer of the instrument reads “∞“ symbol on the scale.
5-2 Battery Check
Set the Function switch to “BATT. CHECK” position and press
the PRESS TO TEST button. The battery voltage is enough when the the pointer stays in BATT. GOOD area or to the right of this area.
If not, replace the batteries with new ones.
NG
# DANGER
OK
●
Do not hold down or lock the PRESS TO TEST button when checking the battery voltage. It may lead to shorter battery life.
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# DANGER
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6. Measurement
6-1 Insulation resistance measurement
● Use a high voltage detector and conrm that there is no
electrical charge in the circuit under test.
● Wear a pair of insulated gloves for high voltage.
● If the Function switch is at the insulation resistance range and the Test button is being pressed down, high voltages are generated and applied to the test leads and the circuit under test continuously. Do not touch the circuit or the test leads.
● The Battery compartment cover must be closed and screwed
during a measurement.
● Do not make measurement when thunder rumbling.
● Connect the Earth Cord (black) to the earth terminal of the
circuit under test.
This instrument measures insulation resistances and checks whether the insulations of electrical equipments or circuits are in good condition or not. So, please check the voltage that can be applied to the object under test before making a measurement.
Note:
● The insulation resistance values of the objects under test may not be stable, and the readings may be unstable.
● Bleep sound may be heard during an insulation resistance measurement, but it is not malfunction.
●It takes time to measure a capacitive load.
● At insulation resistance measurement, positive (+) voltage is outputted from the Earth terminal and negative (-) voltage is outputted from the Line terminal.
Connect the Earth cord to the Earth (ground) terminal. It is recommended to connect the positive(+) pole to the earth
side when measuring insulation resistance against the ground or when a part of the equipment under test is earthed.
With this connection, smaller measured value can be obtained
comparing with other way round.
# DANGER
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(1) Check the voltage which can be applied to the circuit under
test, and set the Function switch to a desired insulation
resistance range.
(2) Connect the Earth cord (black) to the Earth terminal of the
circuit under test.
(3) Place the tip of the Line probe (red) to the circuit under test. Then press the “PRESS TO TEST” button. The buzzer sounds
intermittently during a measurement.
(4) When the green LED illuminates, read insulation resistance
on the outer scale (for high range). Use the inner scale where the red LED illuminates.
# Caution
Always turn off the Breaker for the circuit
under test.
(5) After a test, release the PRESS TO TEST button and wait for
the same amount of time that it took for the measurement performed. Keep the Line probe and the circuit tested connected until electrical charges stored in the circuit under test are completely discharged.
# DANGER
● Do not touch the circuit under test immediately after testing. Capacitances stored in the circuit may cause electric shock.
● Leave the test leads connected to the circuit and never touch
the circuit until electrical discharge completes.
(6) Set the Function switch to “OFF” position, and disconnect the
test leads from the instrument.
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6-2 Continuous measurement
Press and turn the Test button clockwise and lock the button
to measure insulation resistances continuously. Turn the button counter-clockwise and set it to the initial position after
a measurement.
# DANGER
● Be extremely careful not to get electric shock as a high voltage is present on the tip of the test leads continuously.
6-3 Voltage characteristics at measuring terminal
KEW3121B/ 3122B Output characteristics
6000
5000
4000
KEW3122B/ 5000V
3000
2000
Output Voltage (V)
1000
0
0.001 0.01 0.1 1 10 100
Insulation Resistance (GΩ)
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KEW3121B/ 2500V
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6-4 Use of Guard terminal
When measuring the insulation resistance of a cable, leakage
current owing on the surface of cable jacket and the current owing inside the insulator are mixed and may cause error in insulation resistance value. In order to prevent such error, wind a conductive wire around the point where leakage current ows. Then connect it to the Guard terminal. This is to move out the surface leakage resistance of the cable insulation to measure only the volume resistance of insulator. Make sure to use the Guard cord supplied with this instrument to connect the instrument to Guard terminal.
* It is possible to move out the surface leakage resistance of the
insulation and measure only the volume resistance by using the Guard terminal. This is helpful when performing tests in humid
air.
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7. Battery replacement
# DANGER
● Do not open the Battery compartment cover if the surface of
the instrument is wet.
● Never open the Battery compartment cover during a measurement. To avoid electric shock, power off the instrument and disconnect the test leads from the instrument when replacing batteries.
● Always attach and close the Battery compartment cover
when making a measurement.
# CAUTION
● Do not mix new and old batteries or brands of batteries.
● Make sure to install batteries in correct polarity as marked
inside.
(1) Set the Function switch to “OFF” position, and disconnect the
test leads from the instrument.
(2) Loosen the Battery compartment cover-xing screws, and
remove the Battery compartment cover. Remove all eight batteries and replace them with new ones.
(3) After replacing batteries, be sure to tighten up the screw for
the Battery compartment cover.
Make sure to install batteries in correct polarity as marked
inside.
SCREW
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8. How to remove the Hard case
Hold the side surface of the terminal part, and gently pull the unit toward the front.
1. Hold the side surface of the terminal part.
2. Pull the unit toward the front.
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9. Cleaning Meter Cover
This instrument is managed by our company's quality standard and is delivered in the best condition after passed the inspection. But in the dry time of winter static electricity sometimes builds up on the meter cover due to the characteristic of plastic. When static electricity builds up on the meter cover and affects the meter reading, use a cloth dampened with off-the-shelf anti­static agent or detergent to wipe the meter cover surface.
# CAUTION
● When the pointer deects by touching the surface of this tester or zero adjustment cannot be made, do not try to make
measurements.
● Anti-static agent has been applied to the surface of the Meter cover of this instrument. Clean the surface of the cover gently
when it gets dirty.
● To avoid possible deforming or discoloring, do not use organic solvents.
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10. Accessories
10-1 Metal parts for Line Probe, and replacement
# DANGER
Attach MODEL8255 to the test leads to use the instrument in CAT II or higher environments. MODEL8254 and 8019 have exposed large metal parts, therefore, they may short circuit or damage the objects under test, cause re or pose fatal or serious injuries to the users.
(1) Tip metal parts MODEL8255: Standard Prod (straight type, with molded
parts) MODEL8254: Straight Type Prod MODEL8019: Pickel Type Prod To be used to hook the instrument.
(2) Replacement Turn the Line probe counterclockwise to remove the attached
tip metal. Put the tip metal you want to use to the hexagon
socket and turn it clockwise together with the tip of probe,
and tighten up the screws.
MODEL8255
Male Screw
Hexagon Socket
MODEL8254
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MODEL8019
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10-2 How to use the adaptor for recorder
MODEL8324 is an adaptor for a recorder (option) for output
current measurement. Connect it as shown in the below gure.
Output is DC10mV when current of 1μA is owing.
To shield or Earth
To recorder
+－
10-3 Line probe with alligator clip(optional accessory)
MODEL7168A : 3m Line probe with alligator clip MODEL7253 : 15m Line probe with alligator clip
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11. Disposing the Product
Waste Electrical and Electronic Equipment (WEEE), Directive 2002/96/EC
This Product complies with the WEEE Directive (2002/96/EC) marking requirement. The afxed product label (see below) indicates that you must not discard this electrical/electronic product in domestic household waste.
Product Category
With reference to the equipment types in the WEEE directive Annex 1, this product is classied as a “Monitoring and Control instrumentation” product.
Disposing lead-storage batteries
When you throw away the batteries, be sure to cover their positive and negative terminals and always observe local laws and regulations. Insufcient insulation of the terminals may cause explosion or re because electrical energies remain in lead-storage batteries
after use.
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MEMO
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DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations.
03-15 92-2236
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