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Summary of Contents for Kyoritsu Electrical Instruments Works KEW3431
- Page 1 Instruction Manual Compact Insulation resistance tester KEW3431...
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Page 2: Table Of Contents
Contents 1. Safety warnings ･･･････････････････････････････････････ 1 2. Features ･･････････････････････････････････････････････ 5 3. Specifications ･････････････････････････････････････････ 6 4. Instrument layout ･･････････････････････････････････････ 9 5. Accessories ･ ･････････････････････････････････････････ 11 6. Getting started ･･･････････････････････････････････････ 12 6-1 Mechanical zero adjustment ･ ･･･････････････････ 12 6-2 Attaching metal tip/ adapter to test leads ･ ･･･････ 12 6-3 Battery voltage check･･････････････････････････ 13 7．Voltage measurement ･････････････････････････････････ 14 7-1 Measurement method ･ ･････････････････････････ 14 8. Insulation resistance measurement ･････････････････････ 15 8-1 Measurement method ･ ･････････････････････････ 18 8-2 Continuous measurement ･･････････････････････... -
Page 3: Safety Warnings
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 have to be observed by the user to ensure safe operation of the instrument ... - Page 4 # DANGER ● N ever make measurements on circuits in which earth potentials higher than 600 V exist. ● K EW3441 is a CAT III-rated instrument. Do not make measurements under the circumstances exceeding the designed measurement category. ● D o not attempt to make measurements in the presence of flammable gasses. Otherwise the use of the instrument may cause sparking, which can lead to an explosion.
- Page 5 # CAUTION ● A lways make sure to set the function switch to the appropriate position before making a measurement. ● P ower off the instrument after use. Remove batteries if the instrument is to be stored and will not be in use for a long period. ● D o not expose the instrument to direct sunlight, high temperature, humidity or dew. ● U se a damp cloth with neutral detergent or water for cleaning the instrument. Do not use abrasives or solvents. ● T his instrument is not water-proof. Do not let the instrument get wet with water; otherwise it may cause malfunction. ...
- Page 6 Measurement Category T o 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 ...
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Page 7: Features
2. Features KEW3431 can measure insulation resistance and also AC/DC voltage on low-voltage installations of 600V or less. ●Designed to meet the following safety standards IEC 61010-1, IEC 61010-2-030 CAT III 600V Pollution degree 2 IEC 61010-031 ●Compact and lightweight design ● S cale light and LED spot light to facilitate working at dimly illuminated location or at nighttime work. Built-in illuminance sensor automatically turns on off the lights. Auto-light-off function ... -
Page 8: Specifications
3. Specifications ●Measuring range and accuracy（23ºC±5ºC, RH 85% or less） [Voltage measurement] Measurement 0 〜 600V voltage Accuracy within ± 5% of the maximum scale value ※ F or an input voltage of 30V or more, the instrument automatically judges AC or DC and indicates the result with the LED. For AC voltage: Red LED lights up. For DC voltage: Orange LED lights up. （The LED doesn t light up if input voltage is less than 30V.） [Insulation resistance measurement] Rated measurement 250V 500V 1000V voltage Max. effective scale 200MΩ 200MΩ 2000MΩ value Accuracy in first 0.1 to 100MΩ 1 to 1000MΩ effective measuring within ± 5% of indicated value ranges Accuracy in second within ± 10% of indicated value effective measuring ※ m easuring ranges other than above, 0 and ranges ∞ ticks Accuracy at 0 & ∞... - Page 9 ●Applicable ●IEC 61010-1, 2-030 CAT III 600V standards Pollution degree 2 ●IEC 61557-1, -2 ●IEC 60529 IP40 ●IEC 61326-1, 2-2 ●IEC 61010-031 MODEL7260…CAT III 600V (w/ cap) CAT II 1000V (w/o cap) CAT II 1000V (w/ 8017A) ( A ttach the supplied protective cap to use this test leads in CAT III or higher environments.) MODEL7261A…CAT III 600V (w/ alligator clip) CAT II 600V (w/ flat test bar) ( A ttach the alligator clip to use this test leads in CAT III or higher environments.) ※ W hen test probes, sometimes with metal tips, are connected and used with the instrument, the measurement category and voltage rating of the lowest rated item is applied.
- Page 10 ●Operating uncertainty (IEC 61557-2) O perating uncertainty (B) is an error obtained under the nominal operating conditions, and calculated with the intrinsic error (A), which is an error of the instrument used, and the error (En) due to variations. According to IEC61557-2, the maximum operating error should be within ± 30%. Intrinsic error (A) is uncertainty of the performance characteristics of insulation resistance testers in the reference condition.
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Page 11: Instrument Layout
4. Instrument layout (1) Front panel ⑤ ⑥ ⑦ ⑤ ④ ⑧ ③ ⑨ ② Fig. 4-1 ① ⑩ Name Description ① Meter zero adjuster Adjusts the pointer position. ② Pointer Indicates the measured values. Starts/ stops measurement. For continuous ③ Test button measurement, press and turn the button clockwise to lock it in the operating position. Detects ambient brightness to turn on/ off ④... - Page 12 Indicates battery voltage level. LED battery status Solid green : Enough ⑨ indicator Blinking green : Low Solid red : Almost exhausted Switches measurement functions and selects ⑩ Function switch voltage for insulation resistance measurement. (2) Side panel ③ ① ② Fig. 4-2 Name Description ① LINE Terminal for MODEL7260 test lead ② EARTH Terminal for MODEL7261A test lead Illuminates the point to be measured. The light ③...
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Page 13: Accessories
5. Accessories ●Test leads (1) Test lead MODEL7260 with remote control switch (red) ※1 Barrier Metal tip Rating of measurement category of the test lead depends on attaching/ Insulation cap removing the insulation cap. CAT III 600V (w/ cap) Fig. 5-1 CAT II 1000V (w/o cap) (2) Extension prod MODEL8017A ※Attached and used with MODEL7260. Long type and helpful to access the distant measurement spot Fig. 5-2 (3) A set of test leads with alligator clip MODEL7261A Black cord with banana plugs at both ends L-shaped Banana plug ＋ Alligator clip Flat test bar ※1 Barrie ※1 Barrier ＋... -
Page 14: Getting Started
6. Getting started 6-1 Mechanical zero adjustment With the function switch set to OFF position and without pressing the test button, turn the zero adjuster with a screwdriver so that the pointer lines up with the ∞ mark on the insulation resistance scale. In case the instrument is used at sloping place, ensure that the ... -
Page 15: Battery Voltage Check
To avoid getting electrical shocks, ensure that test leads are disconnected from the instrument when replacing the metal tip or adapter for test leads. 6-3 Battery voltage check (1) P lease refer to 11. Battery replacement in this manual and insert batteries in KEW3431. (2) S et the function switch to any position other than OFF to power on theinstrument. (3) Check the color of LED battery status indicator. Solid green : Battery voltage is enough. -
Page 16: 7．Voltage Measurement
7. Voltage measurement # DANGER ● D o not apply a voltage exceeding the maximum allowable input (600V) to the instrument. ● K eep your fingers behind the barrier during a measurement. ● V erify proper operation on a known source before taking actions as a result of the indication of the instrument 7-1 Measurement method Set the function switch to V position to measure voltage. AC/DC (1) Connect the test leads as the following figure shows. ・MODEL7260 to Line terminal ・MODEL7261A to Earth terminal Fig. - Page 17 (3) C heck the reading on the LCD without pressing the test or remote control button. The instrument detects AC/DC automatically, and turns on the red LED for ac input and the orange LED for dc input. ・ W hen the measured voltage is less than 30V, AC/DC auto- detect doesn t work. # CAUTION The pointer sweeps depending on the applied input even while the instrument is powered off; however, accuracy is not guaranteed. In this state, live warning LED doesn t light up. Ensure the instrument is powered on to measure voltage. ̶ 15 ̶...
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Page 18: Insulation Resistance Measurement
8. Insulation resistance measurement This instrument is used to measure insulation resistance in electric appliance or circuit to inspect the insulation performance. Check the voltage rating of the object to be tested before making measurement and select the voltage applied to. Note: ● D epending on the object to be measured, displayed insulation resistance value may not stabilize. ● T he instrument may give bleep during an insulation resistance measure-ment, however, this is not a malfunction. -
Page 19: Measurement Method
8-1 Measurement method (1) Connect the test leads as the following figure shows. ・MODEL7260 to Line terminal ・MODEL7261A to Earth terminal Fig. 8-1 Black (2) C onfirm the circuit under test is not energized, and measure voltage with reference to 7. Voltage measurement . (3) C onfirm the voltage value which can be applied to the object under test, and then set the function switch to a desired range. ● T here is an empty range between 500V and 1000V for safety purpose. If the function switch is set to this safety position, the instrument doesn t start a measurement although the test ... - Page 20 Principle of insulation resistance measurement Resistance Value＝Voltage／Current Fig. 8-2 ＲＸ＝Ｖ／Ｉ Fig. 8-3 (6) Auto discharge function T his function allows electric charges stored in the capacitance of the circuit under test to be automatically discharged after measurement. Set the test button or remote control switch to off with the test leads connected. Discharge can be checked with the ...
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Page 21: Continuous Measurement
●Dual scale R ead insulation resistance on the outer and inner scale depending on the range used for testing. Use the outer scale for the testing on this range. Use the inner scale for the testing on these ranges. # DANGER Never touch the circuit under test immediately after measurement. Capacitance stored in the circuit may cause electric shock. Leave the test leads connected to the circuit and do not touch the circuit ... -
Page 22: Output Voltage Characteristics
8-3 Output voltage characteristics This instrument conforms to IEC61557. This standard defines that the nominal current shall be at least 1mA, and the lower limit of the insulation resistance maintaining the nominal voltage at the measurement terminal. (See the graph below.) This value is calculated ... -
Page 23: Led Insulation Status Indicator
8-4 LED insulation status indicator KEW3431 has insulation status check function. In an insulation measure-ment, the measured value is compared to the pre-set reference value, and either red or green LED lights up according to the result. This function can be turned off. See 10. How to disable LED insulation status indicator & auto-lighting in this manual for ... -
Page 24: Scale Light And Led Light
9. Scale light and LED light The illuminance sensor on this instrument detects ambient brightness andautomatically turns on/ off the scale light and LED light. Once these lights turn on, they stay on for about 15 sec. This auto-lighting function can be turned off. See 10. How to disable LED insulation status indicator & auto-lighting in this manual for detail. -
Page 25: How To Disable Led Insulation Status Indicator & Auto-Lighting
10. How to disable LED insulation status indicator & auto-lighting 1. G et the instrument into configuration mode, to disable the LED insulation status indicator and auto-lighting of scale light and LED light. (1) C over the illuminance sensor with your finger and turn the function switch from OFF to V position and power on the instrument. AC/DC (2) P ress the test button five times within three seconds after the LED ... - Page 26 Blinks when“ON” has been selected for LED insulation status Blinks when“ON” indicator. has been selected for scale light / LED light. Fig. 10-2 3. T he instrument exits from configuration mode when it is powered off butretains the selected setting. It may difficult to get the instrument in configuration mode in outdoor even the sensor is covered with your finger.
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Page 27: Battery Replacement
11. Battery replacement Replace batteries with new ones when the red LED battery status indicator lights up. # DANGER ● D o not open the battery compartment cover if the instrument is wet. ● N ever attempt to replace batteries during a measurement. In order to avoid getting electrical shock, ensure that the instrument is powered off and test leads are disconnected from the instrument before replacing batteries. ● T he battery compartment cover must be closed and screwed before ... -
Page 28: Shoulder Strap Belt Attachment
12. Shoulder strap belt attachment This instrument is equipped with a strap to suspend from the neck to allow both hands to be used freely for easy and safe operation. Fig. 12-1 ̶ 26 ̶... -
Page 29: Storing In Carrying Case
13. Storing in Carrying case Store the instrument and test leads as the following figure shows. Test leads compartment Partition Unit compartment Fig. 13-1 # CAUTION Ensure that the instrument is powered off before storing in the carrying case. ̶ 27 ̶... -
Page 30: Cleaning Meter Cover
14. Cleaning meter cover This instrument is managed by our company s quality standard and is delivered in the best condition after passing the inspection. But in the dry time of winter static electricity sometimes builds up on the meter cover due to the characteristics of plastic. When static builds up on the meter cover and affects the meter reading, use a cloth damped with off-the shelf anti-static agent or detergent to wipe the meter cover surface. # CAUTION ● W hen the pointer deflects by touching the surface of this instrument or zero adjustment cannot be made, do not try to make ... - Page 32 DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations. 3-19 92-2297A...
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