Instruction Manual Simplified Earth Tester KEW 4300
Contents 1. Safety warnings ･････････････････････････････････････････ 1 2. Features ･･･････････････････････････････････････････････ 4 3. Specification ････････････････････････････････････････････ 5 4. Instrument layout ････････････････････････････････････････ 8 5. Accessories ････････････････････････････････････････････ 10 6.
1. Safety warnings This instrument has been designed, manufactured and tested according to IEC 61010-1: 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 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 300V. ● D o 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. ● Never attempt to use the instrument if its surface or your hand is wet. ● B e careful not to short-circuit the power line with the metal part of the test leads when measuring voltage. It may cause personal injury.
CAT.III # Symbols Primary electrical circuits of the equipment connected directly to the distribution panel, and feeders from the distribution panel to outlets. Instrument with double or reinforced insulation User must refer to the explanations in the instruction manual. (Functional) 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.
2. Features KEW4300 is a simplified earth resistance tester (based on 2-pole method) that can be used for various distribution lines and electrical appliances and it also can measure AC/DC voltages. (As for AC voltages, true rms values can be obtained.) ● Designed to meet the following safety standards IEC 61010-1 CAT.
3. Specification ● Measurement range and accuracy (23ºC±5Cº, relative humidity 75% or less) Voltage/ Earth voltage measurement Measurement range Display range Accuracy AC5.0 to 300.0V (45 to 65Hz) (425V peak or less) 0.0 to 314.9V ±1%rdg±4dgt DC±5.0 to ±300.0V 0.0 to ±314.9V ±1%rdg±8dgt *AC measurement method : rms detection For the waveforms other than sinewave of CF<2.5, the specified accuracy ±1%f.s. should be applied. * AC/DC auto-detection at 5V or higher * DC sign appears at 5V or higher.
● Applicable standards ● IEC 61010-1 ● IEC 60529(IP40) ● IEC 61557-1, -5 ● IEC 61326-1, 2-2 ● IEC 61010-031 MODEL7248 / CAT.III600V ( Alligator clip should be attached and used in the CAT. III or higher environment.) MODEL8253 / CAT.III300V (while it is connected to the instrument) * When the test leads are connected to the instrument, the lower category either of them belongs to is applied.
● Operating Error O perating error (B) is an error obtained within the rated operating conditions, and calculated with the intrinsic error (A), which is an error of the instrument used, and the error (Ei) due to variations. According to IEC61557, the maximum operating error should be within ±30%. ● Operating error at earth resistance measurements (IEC61557-5) Formula: B= ±(|A|+1.
4. Instrument layout (1) Instrument Body 1 2 3 4 5 6 7 8 Fig. 4-1 Name Details To connect the replaceable metal tip MODEL8072 1 H+S(C+P) terminal has been installed and delivered. To illuminate the measurement spots The light turns on/off automatically in relation to 2 LED light ambient brightness. To sense ambient brightness for turning on/ off 3 Ambient light sensor the light To conduct resistance measurement Measurement is conducted when the button is held 4 Test button down.
(2) LCD Fig. 4-2 ● Symbols displayed on the LCD Indicate the batteries need to replace. Show the measured results. Appear when the measured result exceeds the display range. Resistance : >2099Ω Voltage : > 314.9V (“-OL” for negative DC voltages) Indicate the end of a measurement with frozen measured result.
5. Accessories ● Test leads (1) MODEL7248 – with Alligator clip and Flat test bar (2) Banana plug, both ends, black L-shaped Banana plug ＋ (3) Alligator clip (4) Flat test bar Fig. 5-1 ＋ Fig. 5-2 Fig. 5-3 ● Tip metal tips for H+S(C+P) terminal (1) MODEL8072 Standard metal tip installed at a shipment. Fig. 5-4 (2) MODEL8253 (3) MODEL8017 Fig. 5-5 Fig.
6. Getting started 6-1 Battery voltage check (1) P lease refer to “10. Replacing batteries” in this manual and insert batteries in KEW4300. (2) H old down the Power button at least 1 sec and power on KEW4300. * A long press of 1 sec or longer is required to power on/ off the instrument. It is to prevent a malfunction. (3) T he battery voltage is extremely low when the “ “ symbol appears at the upper left corner on the LCD. Replace the batteries with reference to “10.
[How to replace the parts] D etach the metal tip by turning the red plastic parts counter clockwise. I nstall the metal tip you want to use into the hexagon hole, and turn the red plastic parts clockwise to tighten firmly. MODEL 8072 MODEL 8253 六角穴 Hexagon hole Internal メネジ thread MODEL 8017 先端金具 Metal tip Fig. 6-1 (2) Test leads ither of the following adapters should be connected to the cord E with Banana plug, both ends. [Adapters for MODEL7248] 1. Alligator clip 2.
7. Voltage measurement # DANGER ● N ever apply voltages exceeding 300V, max over-voltage protection, to this instrument. 7-1 Measurement procedure (1) Connect the test leads to the instrument. P lug the L-shaped Banana plug of MODEL7248 into the E terminal as illustrated below. Fig. 7-1 (2) Connect the adapter for test leads to the earth side of the circuit under test and the metal tip (H+S(C+P) terminal) to the line side respectively.
(3) The measured voltage is displayed on the LCD. Take the reading without pressing the Test button. The instrument judges DC or AC and shows “DC” or “AC” sign on the LCD. *W hen negative DC voltages are detected at the H+S(C+P) terminal, the negative polarity sign “-“ appears to the left of the measured value. * T he LCD does not show “DC”, “AC” nor sign when the measured values are less than 5V. The LCD shows “>314.
8. Earth resistance measurement This instrument can measure the earth resistances of distribution line, internal wiring and electrical appliance. # DANGER ● Never apply inputs exceeding 300V between the measuring terminals at earth voltage measurements. ● No voltage should be applied between the measuring terminals during earth resistance measurements. 8-1 Principle of measurement This instrument carries out earth resistance measurements based on the fall-of-potential method.
8-2 Measurement procedure (1) Connect the test leads to the instrument. P lug the L-shaped Banana plug of MODEL7248 into the E terminal as illustrated below. Fig. 8-2 (2) Connection Connect the instrument as illustrated below. POWER H+S(C+P) LOAD N L E E re Rx Fig. 8-3 Measuring the earth resistance of load Fig. 8-4 M e a s u r i n g t h e e a r t h resistance of wall socket # DANGER ● Always use a voltage detector for testing the earth side of the commercial power supply.
● The displayed value should be less than 10V. The warning LED starts blinking yellow when the earth voltage is 10V or higher. (The LED starts blinking at 3V or higher if the frequency of the earth voltage is 400Hz.) LED starts blinking. 10V or higher: yellow 30V or higher: red Fig. 8-5 E nsue that the systems connected to the earth electrode under test are turned off to get the earth voltages lower when the warning LED for earth voltage starts blinking.
9. LCD backlight and LED light The LCD backlight and the LED light on this instrument turn on/off automatically in relation to ambient brightness. These lights keep on for about 15 sec once they turn on. The Ambient light sensor as shown in the below figure senses the ambient brightness. Ambient light sensor Fig. 9-1 ● D irt on the surface of the sensor may interfere the proper operation of the lights. Keep the sensor clean. ● The sensitivity of the sensor is not adjustable.
10. Replacing batteries When the Battery symbol appears on the LCD, replace the batteries with new ones. # DANGER ●N ever open the Battery compartment cover if the instrument is wet. ● D o not attempt to replace batteries during a measurement. In order to avoid getting an electrical shock, ensure that the instrument is powered off and the test leads are disconnected from the instrument before replacing the batteries. ●A lways install the Battery compartment cover when starting a measurement.
MEMO ̶ 20 ̶
MEMO ̶ 21 ̶
DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations.
