INSTRUCTION MANUAL MODEL4200 KEW4202 DIGITAL EARTH CLAMP TESTER MODEL 4200/KEW 4202 KYORITSU ELECTRICAL INSTRUMENTS WORKS，LTD.
Contents 1. Safety warnings ............................................................................................. 1 2. Features .......................................................................................................... 3 3. Specification .................................................................................................. 4 4. Instrument layout ........................................................................................... 6 5. Measurement principle .........
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 procedures which have to 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.
# DANGER Never make measurement on a circuit in which the electrical potential exceeds AC300V. Do not make measurement when thunder is rumbling. Stop measurement and take off the instrument from the object under test. Do not attempt to make measurement in the presence of flammable gasses. Otherwise, the use of the instrument may cause sparking, which can lead to an explosion. To avoid electrical shock by touching the equipment under test or its surroundings, be sure to wear insulated protective gear.
2. Features This instrument is a digital clamp-on earth resistance tester, and it is used in multiearthed systems. Can measure the earth resistance by simply clamping around the earthed wires. This instrument also equips AC current function to measure current up to 30A same as our traditional leakage clamp meters. A single earthing cannot be measured. (only for multiple-earthing system) Wide measuring range (Auto-ranging) Earth/ground resistance Max. 1200Ω AC current Max. 30A Min. resolution 0.01Ω Min.
3. Specification Measuring range and accuracy Function Range 20Ω 200Ω Resolution 0.01Ω 0.1Ω 600Ω 1Ω 1200Ω 100mA 1000mA 10A 30A 10Ω 0.1mA 1mA 0.01A 0.1A Earth resistance (Auto-ranging) AC current (ACA) (50Hz/60Hz) (Auto-ranging) Measuring range Accuracy 0.00 - 20.00Ω ±1%±5dgt 20.0 ‒ 200.0Ω ±3%±5dgt 200 - 399Ω ±6%±5dgt 400 - 599Ω ±10%±10dgt 600 - 1260Ω 0.0 - 100.0mA 100 - 1000mA ±2%±5dgt 1.00 - 10.00A (sine wave) 10.0 - 30.0A * Crest factor ≦2.
Auto power-off Turns power off about 10 minutes after the last button operation. Applicable standards IEC61010-1 (CAT. IV 300V Pollution degree2) IEC61010-2-032 IEC61326-2-2 (EMC standard) External communication Bluetooth Ver2.1+EDR Class2 method Withstand voltage AC5160Vrms/ 5 seconds Between the Transformer jaws fitted parts and Case enclosure (except for jaws) Insulation resistance 50MΩ or more at 1000V Between the Transformer jaws fitted parts and Case enclosure (except for jaws) Conductor size Approx.
4. Instrument layout Name of each parts and buttons (for MODEL4200 and KEW4202) 1 Transformer jaw 2 Trigger 3 Backlight button Switches on/off the backlight. 4 Function button Switches ACA/ Earth resistance functions. 5 Memory mode button C heck the measured value by Data number. 6 Data hold button F reezes/ releases the fixed readings. 7 Power button Turns on/off the instrument.
5. Measurement principle This instrument can measure the earth resistance to earth in multi-earthed system. Let's regard earth resistance under test as Rx, and the other earth resistances as R1, R2, …Rn. Of these earth resistances, R1, R2, …Rn can be considered that they are connected in parallel. And can be regarded as a combined resistance Rs. The Rs can be regarded small enough against Rx since a combined resistance consists of several resistances.
By applying the Voltage (V) to the circuit from the Transformer jaw (CT1), current I is (shall be flowed) flowed corresponding to the earth resistance. R can be put out by the calculation after detecting the current with the other Transformer jaw (CT2). In this case, R displayed in this instrument can be regarded as Rx because Rs can be regarded small enough against Rx. # CAUTION This instrument is not supporting the measurement for the locations with following earth systems.
6. Getting started # CAUTION This instrument performs self-calibration for about 3 seconds when it is turned " is displayed on the LCD.) Do not clamp onto any conductor or on. (" open the jaws in this period. Otherwise, inaccurate measurement may occur. (1) Check the battery voltage When nothing is displayed on the LCD, press the power button and turn on the instrument. Battery voltage is enough when indication is clear and the " " symbol is not displayed on the LCD after turning on the instrument.
7. Measuring method # DANGER Never make measurement on a circuit in which the electrical potential exceeds AC300V. 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 measurement with the Battery cover removed. Do not measure a current over 30A. Transformer jaws may heat to cause a fire or deformation of molding parts, which will degrade insulation.
7-1 Normal measurement of current * Press the Function button and select the ACA function. * Confirm the displayed unit is " mA ", and the " MEM " is not displayed at the upper left on the LCD. * Press the trigger to open the Transformer jaws, and close them over one conductor only. * Measured current value is displayed on the LCD. (Earth leakage current that flows through an earthed wire can be measured by this method.
7-3 Measurement of earth resistance # CAUTION Follow the procedure described in "7-1 Normal measurement of current" and measure the current flowing on the earthed wire prior to the measurement of earth resistance. In case that the " " symbol is displayed at the upper right of the LCD, it means that a great error would be included in the measured result.
8. Other functions 8-1 Auto power-off function This function is to prevent the instrument from being left turned on and conserve battery power. The instrument automatically turns off about 10 minutes after the last button operation. To return to the normal mode, press the Power button again and turns on the instrument. ◇ The buzzer sounds before the instrument turns off. ◇ To disable the auto power-off function, follow the procedure below.
8-5 Memory function This function is to save and display the measurement results. Saving the measurement results (1) Select any data number (from 1 to 100) by using the Cursor button or at ACA or Earth resistance function, and save the measurement results. ◇ When the Cursor button is being pressed down, the number switches quickly. (2) To save the measurement result being displayed on the LCD, press the Save button . Then the result is saved to the selected data number.
8-6 Bluetooth Communication Function (KEW4202 only) KEW4202 can perform data communication between Android devices via Bluetooth communication. Notes on using Bluetooth function: This function is not available on MODEL4200 but available on KEW4202. Before starting to use this function, download the special application“KEW Smart”from the Internet site. Some of the functions are available only while connected to the Internet. For further details, please refer to“11. KEW Smart Functions”or“Help”for“KEW Smart”.
Set-up: First, set a Bluetooth connection (pairing) from an Android device. For further details, please refer to the instruction manual for the Android device,“Help”for “KEW Smart”or“10. Pairing with Bluetooth compatible devices”. Communication with Android devices: Measurement results of KEW4202 can be displayed on Android devices via Bluetooth communication by using the special application“KEW Smart”. Remote checking of measurements is possible without accessing KEW4202.
9. Battery replacement # WARNING In order to avoid possible shock hazard, take off the instrument from the conductor under test and turn off the instrument before trying to replace the batteries. # CAUTION Do not mix new and old batteries. Never use the different kinds of batteries at the same time. Install batteries in correct polarity as marked inside. When the battery voltage warning symbol " " is displayed on the upper " left of the LCD, replace the batteries.
10. Pairing with Bluetooth compatible devices (KEW4202) It is necessary to perform the pairing procedure to connect KEW4202 and Android devices via Bluetooth communication. If the“ “ symbol is displayed on the LCD of KEW4202, replace the batteries with new ones before performing the pairing procedure. (1) Power on KEW4202. (2) Power on the Android device, and find the Setting menu. Look for the Bluetooth setting in the Wireless Setting menu. (3) On the Android device, choose Search for Bluetooth Devices.
11. Features of KEW Smart (KEW4202) Remote checking of measurements is possible without accessing KEW4202 using . the special Android application“KEW Smart” The application“KEW Smart”is available on download site for free. (An Internet access is required.) Please note that communication charge is incurred separately for downloading applications and using special features of them. For your information,“KEW Smart”is provided on-line only.
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DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations.
