KEW 2433 Leakage Clamp Meters Instruction Manual

KEW 2433 Leakage Clamp Meters

The KEW SNAP 2432/2433 Leakage Current Tester is a product designed and tested according to IEC standards for electrical safety. It is used to measure load current and earth leakage current in electrical circuits.

Instructions

Current Measurement

• Never make measurements on circuits with voltages greater than 300V AC or DC.
• Keep your fingers and hands behind the barrier during measurement to avoid possible shock hazards.
• When measuring current above 300A or 400Hz, be sure to use the Auto-range function to avoid inaccurate readings.
• Avoid applying shock, vibration, or excessive force to the jaw tips during measurement.
• Take care not to damage or deform molded parts, as this can degrade the product’s performance.

Load Current Measurement

Use the tester to measure load current in electrical circuits.
Refer to Fig. 1 for a visual representation of load current.

Earth Leakage Current Measurement

Use the tester to measure earth leakage current in electrical circuits. Refer to Fig. 2 for a visual representation of earth leakage current.

Safety Warnings

• The instrument has been designed and tested according to IEC standards for electrical safety.
• Take care not to damage or deform molded parts, as this can degrade the product’s performance.
• Avoid applying shock, vibration, or excessive force to the jaw tips during measurement.
• Never make measurements on circuits with voltages greater than 300V AC or DC.

OPERATING INSTRUCTIONS

Current Measurement

DANGER

• In order to avoid possible shock hazards, never make measurements on circuits having a potential of 300VAC or greater.
• The transformer jaws are made of metal and their tips are not completely insulated. Be especially careful about the possible shorting where the equipment under test has exposed metal parts.
• Never make measurements with the battery compartment cover removed.
• When measuring current is 300A or more ( 400Hz or more ), be sure to stop measurement within 5 minutes. Otherwise, transformer jaws may heat to cause a fire or deformation of molded parts, which will degrade the insulation.
• Keep your fingers and hands behind the barrier during measurement.

CAUTION

• Take sufficient care to not to apply shock, vibration or excessive force to the jaw tips. Otherwise, precisely adjusted Transformer Jaw tips will be damaged.
• When a foreign substance is stuck in the jaw tips or they cannot properly engage, the transformer jaws do not fully close. In such a case, do not release the jaw trigger abruptly or attempt to close the transformer jaws by applying external force. Make sure that the jaws close by themselves after removing the foreign substance or making them free to move.
• The maximum size of a conductor to be tested is 40mm in diameter. Accurate measurement cannot be made on a conductor larger than this, because the transformer jaws cannot fully close.
• When measuring a large current, the transformer jaws may buzz. This has no effect on the instrument’s performance or safety.

1. Set the Range Selector Switch to the desired position. Current to measure should be within the selected measuring range.
2. Normal measurement (See Fig.1, 2): Press the jaw trigger to open the transformer jaws and close them over one conductor only. The measured current value is shown on the display. Earth leakage current or small current that flows through a grounded wire can also be measured by this method.
3. Measuring out-of-balance leakage current (See Fig. 3): Clamp onto all conductors except a grounded wire. The measured current value is shown on the display.

SAFETY WARNINGS

This instrument has been designed and tested according to IEC Publication 61010: Safety Requirements for Electronic Measuring Apparatus. This instruction manual contains warnings and safety rules which must be observed by the user to ensure the safe operation of the instrument and to retain it in a safe condition. Therefore, read through these operating instructions before starting to use the instrument.

WARNING

• Read through and understand the instructions contained in this manual before starting to use the instrument.
• Save and keep the manual handy 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.
• Failure to follow the instructions may cause injury, instrument damage, and/or damage to equipment under test. Kyoritsu is by no means liable for any damage resulting from the instrument in contradiction to this cautionary note.

The symbol indicated on the instrument means that the user must refer to related parts of the manual for safe operation of the instrument. Be sure to carefully read the instructions following each symbol in this manual.
DANGER is reserved for conditions and actions that are likely to cause serious or fatal injury.
WARNING is reserved for conditions and actions that can cause serious or fatal Injury.
CAUTION is reserved for conditions and actions that can cause minor injury or Instrument damage.
Following symbols are used on the instrument and in the instruction manual. Attention should be paid to each symbol to ensure your safety.

Refer to the instructions in the manual.

• This symbol is marked where the user must refer to the instruction manual so as not to cause personal injury or instrument damage.
• Indicates an instrument with double or reinforced insulation.
• Indicates that this instrument can clamp on bare conductors when measuring a voltage corresponding to the applicable Measurement category, which is marked next to this symbol.
• Indicates AC (Alternating Current).
• This instrument satisfies the marking requirement defined in the WEEE Directive (2002/96/EC). This symbol indicates a separate collection for electrical and electronic equipment.

DANGER

• Never make measurement on a circuit having potential of 300VAC or greater.
• Do not attempt to make measurement in the presence of flammable gasses. Otherwise, the use of the instrument may cause sparking, which leads to an explosion.
• The transformer jaws are made of metal and their tips are not completely insulated. Be especially careful about the possible shorting where the equipment under test has exposed metal parts.
• Never attempt to use the instrument if its surface or your hand is wet.
• Do not exceed the maximum allowable input of any measurement range.
• Never open the battery compartment cover when making measurement.
• Never try to make measurement if any abnormal conditions, such as broken Transformer jaws or case is noted.
• The instrument is to be used only in its intended applications or conditions. Otherwise,safety functions equipped with the instrument doesn’t work, and instrument damage or serious personal injury may be caused.
• Keep your fingers and hands behind the barrier during measurement.

How to Use

How to Use Frequency Selector Button

When high frequencies from such equipment as inverters are present in the circuit under test, the instrument measures AC current of not only 50Hz or 60Hz of fundamental frequency but also of these high frequencies and harmonics. To eliminate the effect of such high frequency noise and measure AC current of 50Hz or 60Hz fundamental frequency, a “Low pass” filter circuit in incorporated into the instrument which works when “50/60Hz” frequency response is selected with the Frequency Selector Button. Cut-off frequency of the “Low pass” filter is about 160Hz with attenuation characteristic of approx. -24dB/octave. When the Frequency Selector Button is pressed, “50/60Hz” mark is shown on the left side of the display. When the Frequency Selector Button is pressed again, fequency response is switched to WIDE with “WIDE” mark shown on the display. Output characteristic are shown in Fig.4.

Note
Characteristic of -24dB/octiave means that signal magnitude declines to about one sixteenth of that at the initial frequency when frequency doubles. KEW SNAP 2432 and KEW SNAP 2433 have the following two settings for the Frequency Selector Button.

WIDE (20Hz-): Permits measurement of currents of fundamental frequencies as well as currents of high frequencies generated by such equipment as inverters
50/60Hz (20-approx.160Hz): Filters out high frequency currents and measures current of fundamental frequency only.

WARNING

• Never attempt to make any measurement, if any abnormal conditions are noted, such as broken case, cracked test leads and exposed metal parts.
• Do not install substitute parts or make any modification to the instrument. Return the instrument to Kyoritsu or your distributor for repair or re-calibration.
• Do not try to replace the batteries if the surface of the instrument is wet.
• Always switch off the instrument before opening the battery compartment cover for battery replacement.

CAUTION

• Make sure that the range selector switch is set to an appropriate position before making measurement.
• Do not expose the instrument to the direct sun, extreme temperatures or dew fall.
• Be sure to set the range selector switch to the “OFF” position after use. When the instrument will not be in use for a long period of time, place it in storage after removing the batteries.
• Use a damp cloth and detergent for cleaning the instrument. Do not use abrasives or solvents.
• This instrument isn’t dust & water proofed. Keep away from dust and water.

Measurement Category
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 Ill environments can endure greater momentary energy than one designed for CAT II.

• CAT II . Circuits which are not directly connected to the mains power supply. . Electrical circuits of equipment connected to an AC electrical outlet by a power cord
• CAT Ill : 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 en•trance, and to the power meter and primary over-current protection device (distribution panel).

FEATURES

• Digital clamp tester for AC leakage measurement.
• Least affected by external magnetic field, providing wide measuring range from very small to large currents.
• Designed to safet standard IEC 61 010-2-032: Measurement category CAT m, 3bOV and pollution degree 2.
• Teardrop-shaped jaws for ease of use in crowded cable areas and other tight places.
• Data hold function to allow for easy readings in dimly lit or hard-to-reach locations.
• Provides filtering function to remove high frequency generated by such equipment as inverters.
• Peak hold function to allow for measurement of current variation as short as 1 Omsec.
• Auto-power-off function prevents unnecessary power consumption
• The dynamic range of 4000 counts full scale.
• Large easy-to-read LCD display with letter height of 13mm.
• Operation confirming beeps.
• Insulation barrier at the tip of transformer jaws for improved safety.

Recently there has been increased use of power through inverters, switching regulators, etc. When the high-frequency noise from such appliances leaks or flows into the ground through capacitors not filtering completely, the earth leakage breaker may trip even though there is no “actual” leakage. In such a case, the instrument do not give leakage current reading if “50/60Hz” selected. Take current readings with the 50/60Hz responses respectively to make effective Selector Button. frequency response is and WIDE frequency use of the Frequency

Peak Current Measurement

1. Set the Range Selector Switch to the desired position. (Current to measure should not exceed the selected measuring range.)
2. Select “WIDE”or “50/60Hz” with the Frequency Selector Button.
3. With the transformer, jaws clamped onto the conductor under test, press the Peak Hold Button to set the interment to the peak measurement mode. (“P” is shown on the display.)
4. The display reads 1/ 2 of the peak current value. Therefore, an rms reading is shown when a current of a sinusoidal waveform is measured.
5. After peak measurement, press the Peak Hold Button to return to the normal measurement mode.

Note: When leakage current is measured in the peak measurement mode, the reading may change if the transformer jaws are opened and closed. Please read the display with the conductor under test clamped, otherwise, after fixing the display by using the data hold function, please remove the instrument from the conductor to be measured, and read the display. To measure the peak current again, please release the data hold, and return the instrument to the normal measurement mode once with the Peak Hold Button, then set it in the peak measurement mode.

OTHER FUNCTIONS

Auto-Power-Off Function
This is a function to prevent the instrument from being left powered on and conserve battery power. The instrument automatically turns off about 10 minutes after the last switch or button operation. To return to the normal mode, turn the Range Selector Switch to OFF, then to the desired position. Disabling Auto-Power-Off Function: To disable the auto-power-off function, power on the instrument with the Data Hold Button pressed. About 3 seconds after powering on the instrument, “P.OFF” is shown on the display. To enable the auto-power-off function, turn on the instrument without pressing the Data Hold Button.
Note: The auto-power-off function is disabled in the peak measurement mode.

Date Hold Function
This is a function to freeze the readings on the display. When the Data Hold Button is pressed once, the current reading is held even though the current under test varies. “H” mark is shown on the upper right corner of the display. To exit the data hold mode, press the Data Hold Button again.
Note: When the auto-power-off function works while the instrument is in the data hold mode, data hold is canceled.

SPECIFICATIONS

Measuring ranges and accuracy

When measuring the current to which pulse element is superposed, differences of the indicated value may be caused between ranges, if the peak value exceeds the measurement range to a large extent. In this case, the reading at the bigger range should be taken as a right value. Counts equal to or less than 5 counts are corrected to zero. The max indication at the 40mA/400mA range on MODEL2433 is 6000 counts. Minute current may exist while zero is displayed at 400A/400mA range. Measurement should be made also at a lower range.

• Operating System: Sequential comparison

• Display: LCD with max. reading of 3999 (MODEL 2432 & MODEL2433’s 400A range), 6000 (MODEL2433’s 40mA/400mA range)

• Low battery warning: “BATT” mark appears on the display

• Overrange Indication: “OL” appears on the display when upper limit of the measuring range is exceeded

• Response Time: Approx. 2 seconds

• Sample Rate: Approx. 2.5 times per second

• Location for use: Indoor use, Altitude up to 2000m

• Accuracy-insured: 23°C ‡5°C, relative humidity 85% or less

• Temperature and (without condensation)

• Humidity Ranges: Operating Temperature 0-40°C, relative humidity 85% or less

• Operating Temperature 0-40°C, relative humidity 85% or less
  and Humidity Ranges: (without condensation) Storage Temperature -20-60°C, relative humidity 85% or less

• Storage Temperature and Humidity Banges: -20-60°C, relative humidity 85% or less (without condensation)

• Power Source: Two 1.5V R03 (UM-4) batteries

• Current Consumption: Approx. 13mA

• Measurement Time: Approx. 40 hours

• Auto-power-off Function: Turns power off about 10 minutes after the last switch operation

• Safety Standard: IEC 61010-2-032 Measurement CAT II 300V, pollution degree 2 IEC 61326-1 (EMC)

• Environmental standards: EU RoHS directive compliant

• Overload Protection: 2432: 120AAC max. for 10 seconds 2433: 480AAC max. for 10 seconds

• Withstand Voltage: 3470VACrms (50/60Hz) for 5 sec. between metal part of the transformer jaws and housing case (except transformer law case)

• Insulation Resistance: 10M or greater at 1000V between metal part of transformer jaws and housing case (except transformer jaw case)

• Conductor Size: Approx. 40mm in diameter max.

• Dimensions: 185(L)X81 (W)X32(D)mm

• Weight: 2432: Approx. 290g including batteries 2433: Approx. 270g including batteries

• Accessories: Two R03 (UM-4) batteries Carrying case Model 9052 Instruction manual

BATTERY REPLACEMENT

WARNING
In order to avoid possible shock hazards, always set the Range Selector Switch to the OFF position before trying to replace the batteries.

CAUTION

• Do not mix new and old batteries.
• Install batteries in the orientation as shown inside the battery compartment, observing correct polarity.

When the battery voltage warning mark “BATT” is shown on the top left corner of the LCD, replace the batteries. Note that the display blanks and the “BATT” mark is not shown if the batteries are completely exhausted.

1. Set the Range Selector Switch to “OFF.”
2. Loosen the battery-compartment cover- fixing the screw on the lower back of the instrument.
3. Replace the batteries with two new R03 (UM-4) 1.5V batteries.
4. Put the battery compartment cover back in place and tighten the screw.

Note: For use for a long period of time, use alkaline batteries.

INSTRUMENT LAYOUT

PREPARATIONS FOR MEASUREMENT

Checking Battery Voltage
Set the Range Selector Switch to any position other than the OFF position. If the marks on the display is clearly visible without the “BATT” mark showing, the battery voltage is OK. If the display blanks or is indicated, replace the batteries according to section 8: Battery Replacement.

NOTE

When the instrument is left powered on, the auto-power-off function automatically shut the power off; The display blanks even if the Range Selector Switch is set to a position other than the OFF position in this state. To power on the instrument, turn Range Selector Switch or press the Data Hold Button. If the display still blanks, the batteries are completely exhausted. Replace the batteries.

Checking Switch Setting

Make sure that the Range Selector Switch is set to the appropriate range. Also make sure that data hold function is not enabled.the inappropriate range is selected, the desired measurement cannot be made.

DISTRIBUTOR

Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations.

• 2-5-20, Nakane, Meguro-ku,
• Tokyo, 152-0031 Japan
• Phone: +81-3-3723-0131
• Fax: +81-3-3723-0152
• Factory: Ehime, Japan  www.kew-Itd.co.jp

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