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Summary of Contents for Kyoritsu Electrical Instruments Works KEW4105DLBT
- Page 1 Instruction Manual KEW4105DL KEW4105DLBT (Equipped Bluetooth) Digital Earth Resistance Tester KEW 4105DL/4105DLBT...
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Page 2: Table Of Contents
Contents 1. Safety warnings ････････････････････････････････････････････1 2. Features ･･･････････････････････････････････････････････････5 3. Specifications ･･････････････････････････････････････････････6 4. Name of parts ･･････････････････････････････････････････････9 5. Accessories ･･････････････････････････････････････････････ 12 6. Getting started ･･･････････････････････････････････････････ 15 7. Earth resistance measurement ･････････････････････････････ 16 7-1. Measurement principle ･ ･･････････････････････････････ 16 7-2. P recision measurement (with test leads for precision measurement) ･･････････････････････････････････････ 16 7-3. S implified measurement (with test leads for simplified measurement) ･･････････････････････････････････････ 20 8. Comparator function ･･････････････････････････････････････ 23 8-1. Comparator function ････････････････････････････････ 23 8-2. How to enable/ disable comparator function ･･････････ 24 9. Switching indications of aux. earth resistance warning ･･･････ 25 10. Backlight ･･･････････････････････････････････････････････ 25 11. Bluetooth communication function (KEW 4105DLBT only) ･･ 26 11-1 Bluetooth communication ... -
Page 3: Safety Warnings ････････････････････････････････････････････1
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 and to maintain it in safe ... - Page 4 # DANGER ● N ever make measurements on circuits in which earth potentials higher than the following values exist. * 3 00 V or higher in CAT II, 150 V or higher in CAT III and 100 V or higher in CAT IV environment. ● K eep your hand and fingers behind the protective finger guard during a measurement. ● D o not attempt to make measurements in the presence of flammable ...
- Page 5 # CAUTION ● A lways make sure to set the range selector 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.
- Page 6 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 III environments can endure greater momentary energy than one designed for CAT II. O : C ircuits which are not directly connected to the mains power supply. ...
- Page 7 - C omparator function to give warning when a measured value exceeds the pre-set reference value. For further detail, see 8-1. Comparator function in this manual. This function can be disabled. ● E quipped with Bluetooth communication function (KEW4105DLBT only) R emote monitoring and data save on your tablet device are possible by pairing KEW 4105DLBT and your tablet.
- Page 8 3．Specifications ● Measuring range and accuracy (23ºC±5ºC, RH 75% or less) Earth voltage measurement Measuring range Display range Accuracy 0 to 300 V AC 0.0 to 314.9 V (45 - 65Hz) ±1%rdg±4dgt ±0 to ±300 V DC 0.0 to ±314.9 V Measuring method: Average sensing, True RMS value display * A C/ DC auto-detection for an input of 2 V or higher. The LCD shows AC or DC mark according to the input polarity. Earth resistance measurement Measuring Range Display range Accuracy* range 20Ω 0.00 to 20.99Ω ±1.5%rdg±0.08Ω Range 200Ω 0.00 to 2000Ω...
- Page 9 ● Applicable ● IEC 61010-1 standards C AT II 300 V CAT III 150 V CAT IV 100 V Pollution degree 3 ●IEC 61010-2-030 ●IEC 61010-031 ●IEC 61557-1, -5 ●IEC 60529 IP67 ●IEC 61326-1, -2-2 ●EN 50581 MODEL7127B…CAT III 300 V CAT IV 150V * W hen test leads are connected to and used with the instrument, the lower category either of them belongs to is applied. ● Location for use Altitude 2000m or less, in-door/ out-door use ● Display Liquid crystal display with backlight ● Operating temp. -10ºC to 50ºC, 80% or less (no condensation) & humidity ● Storage temp. -20ºC to 60ºC, 75% or less (no condensation) & humidity ● E xternal Complies with Bluetooth Ver5.0. communication feature (KEW 4105DLBT only) ...
- Page 10 ● Operating uncertainty O perating uncertainty (B) is an uncertainty obtained under the rated operating conditions, and calculated with the intrinsic uncertainty (A), which is an error of the instrument used, and the error (En) due to variations. A ccording to IEC61557, the maximum operating uncertainty should be within ± 30%. ● O perating uncertainty in earth resistance measurements (IEC61557-5) * Formula: ...
- Page 11 4．Name of parts (1) Front panel ① ② ④ ⑥ ⑤ ③ Fig. 4-1 Name Description ① LCD LCD with backlight ② Test button Starts/ stops a measurement. ③ Backlight button Turns on/ off the backlight. Selects a range for earth resistance or ④ Range selector switch earth voltage measurement. G r e e n L E D li g h t s u p i n e a r t h LED ...
- Page 12 (2) Terminal part ① ② ③ Fig. 4-2 Terminal Designated function ① For an earth electrode ② S(P) For an aux. earth (potential) electrode ③ H(C) For an aux. earth (current) electrode (3) LCD Fig. 4-3 ● Symbols common to all functions Battery level indicator Segments for numerical display Indicates Over-range status ‒ the measured value is exceeding the display range. Resistance: >20.99 (20Ω range) >209.9 (200Ω range) >2099 (2000Ω range) Voltage : > 314.9V( <-314.9V is displayed for negative DC input) ̶ 10 ̶...
- Page 13 ● Symbols for earth measurement Measurement unit Warning - Aux. earth resistance is too high. (See P. 18.) Data hold is active. Comparator function is active. While the comparator function is active, these signs indicate that the present input is more than the pre-set threshold values. >10 Ω (20Ω range) >100Ω (200Ω range) >500Ω(2000Ω range) While the comparator function is active, this sign indicates that the present input is more ...
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Page 14: Accessories
5．Accessories (1) Test leads for precision measurement MODEL7266 (Red: 20m, Yellow: 10m, Green: 5m) Fig. 5-1 (2) Test leads for simplified measurement MODEL7127B 2pcs (red & black) Protective finger guard* 2pcs (black) Fig. 5-2 Protective finger guard* P rotective finger guard is a part providing protection against electrical shock and ensuring the minimum required air and creepage distances. (3) Auxiliary earth spike MODEL8041 Fig. 5-3 (4) Cable reel (supplied depending on the purchased model) Yellow cable (10m) Red cable (20m) Fig. 5-4 Cable reel + Red cable (20m) MODEL7267 Cable reel + Yellow cable (10m) MODEL7268... - Page 15 (5) Shoulder strap MODEL9121 (6) Six AA alkaline batteries (LR6) (7) Instruction manual (8) Hard case MODEL9191 (supplied depending on the purchased model) Each item can be stored as shown below. Test leads for simplified measurement Test leads for precision measurement Auxiliary earth spikes Fig. 5-5 Main unit (9) Soft case MODEL9190 (supplied depending on the purchased model) Each item can be stored as shown below. Test leads for simplified measurement and for Main unit...
- Page 16 H ow to take out the tester from hard case: P erform housing procedure in reverse order. P ull up the tester in sloping direction and then take out the tester. ● Optional accessories (1) Adapter for measurement terminal MODEL8259 Offering easy connection of a cable with spade connector Red, yellow, green Fig. 5-7 Fig. 5-8 # DANGER Do not connect the adapter of precision test leads to mains power ...
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Page 17: Getting Started
6．Getting started Battery voltage check (1) P lease refer to 12. Battery replacement in this manual and insert batteries in this instrument. (2) T urn and set the range selector switch to any position other than OFF to power on the instrument. (3) B attery level indicator appears at the upper left on the LCD. Battery voltage is extremely low if mark is displayed. Replace batteries with reference to 12. Battery replacement to carry out further measurements. -
Page 18: Earth Resistance Measurement
7．Earth resistance measurement With the earth resistance measurement function of this instrument, earth resistance of power distribution lines, in-house wiring system and electrical appliances can be measured. # DANGER ● B e extremely careful when measuring earth resistance; high voltage, 50 V max is generated across H(C) ‒ E terminals. ● W hen measuring earth voltage, do not apply 300 V or higher voltage between S(P) ‒ E and between H(C) ‒ E terminals. - Page 19 Fig. 7-2 Green Yellow Yellow Green Earthed electrode Auxiliary Fig. 7-3 under test earth spikes Insert the plug of test leads firmly into each terminal. If they are not inserted firmly, the loose connection may cause inaccurate readings. Note: Make sure to stick the auxiliary earth spikes in the moist part of the soil. Give enough water where the spikes have to be stuck into the dry, stony or sandy part of the earth so that it may become moist. In case of concrete, lay the auxiliary earth spike down and water it, or put a wet cloth etc. on the spike when making measurement. Confirm that the LED for aux. earth resistance lights up before pressing ...
- Page 20 Confirm that the displayed voltage value is 25V or less. When the display reads more than 25V, the warning LED as shown below lights up. (The warning LED lights up at; more than 10V for DC earth voltage and more than 5 V for earth voltage of 400 Hz.) Fig. 7-5 Red LED lights up. Excessive errors in earth resistance measurement may be caused in the condition that warning LED for high earth voltage is lighting up. To avoid this, make measurement after reducing the voltage by turning ...
- Page 21 (4) Auxiliary earth resistance I f the auxiliary earth resistance is within the allowable range and doesn t affect measurement, the green LED shown below lights up. The table below shows the upper limit of auxiliary earth resistance. Green LED lights up. Fig. 7-7 Upper limit of auxiliary earth resistance Measurement range Aux. earth resistance 20Ω 10 kΩ 200Ω 50 kΩ 2000Ω 100 kΩ If the auxiliary resistance of auxiliary spike H(C) or S(P) is too high to make measurement, the display reads RH̲H or RS̲H . Recheck the ...
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Page 22: S Implified Measurement
# CAUTION ● I f measurement is made with the test leads twisted or in touch with each other, the reading of the instrument may be affected by induction. For accurate measurement, test leads should be arranged so as not to be contacted with each other. ● I f earth resistance of auxiliary earth spikes is too large, it may result in inaccurate measurement. Make sure to stick the auxiliary earth spikes H(C) and S(P) into the moist part of the earth carefully, and ensure sufficient connections between the respective connections. 7-3. Sim plifie d m easu rem e nt (with test lea d s fo r simplified measurement) Use ... - Page 23 [How to attach] Firmly insert and connect the adapter you want to use to the end of the cord (with banana plugs at both ends). Alligator clip Banana plugs, both ends Flat test bar Fig. 7-11 Insert the plug of test leads firmly into each terminal. If they are not inserted firmly, the loose connection may cause inaccurate readings. # DANGER ● T o avoid getting electrical shocks, ensure that test leads are disconnected from the instrument when replacing the metal tip or adapter for test leads. (2) Wiring Make connection as shown in the following figure. Indicated Secondary Primary...
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Page 24: Measurement
(3) Earth voltage check ● S elect the Earth voltage function and check the voltage value displayed on the LCD. The displayed earth voltage is the voltage between S(P) and E terminals. C onfirm that the displayed voltage value is 25 V or less. When the display reads more than 25 V, the warning LED as shown below lights up. (The warning LED lights up at; more than 10 V for DC earth voltage and more than 5 V for earth voltage of 400 Hz.) Display example Fig.7-13... -
Page 25: Comparator Function
When the measured result exceeds the display range (over-range), the LCD shows: >20.99Ω (20Ω range) >209.9Ω(200Ω range) >2099Ω (2000Ω range). (5) Simplified measurement value T wo-pole method is used for simplified measurement. In this method, earth resistance value re of earth electrode connected to terminal H(C) ‒ see Fig. 7-12 - is added to true earth resistance value Rx and shown as an indicated value Re. Re (indicated value) = Rx + re ... -
Page 26: How To Enable/ Disable Comparator Function
Display example (200Ω range) Blinks Measured value is lower than In case the measured value the reference value exceeds the reference value Fig. 8-1 8-2. How to enable/ disable comparator function * The comparator function has been disabled by default. 1. Set the range selector switch to OFF position. 2. Power on the instrument while holding down the backlight button. 3. A ll segments in the LCD light up, and then COMP ... -
Page 27: Switching Indications Of Aux. Earth Resistance Warning
9. Switching indications of aux. earth resistance warning Warning indications for aux. earth resistance can be switched between (1) and (2) as shown in the table below; default setting is (1). Conditions Resistance at H(C) terminal is high. Resistance at S(P) terminal is high. ● How to switch the indications: (1) T urn the range selector switch from OFF to EARTH VOLTAGE while pressing down the TEST and backlight button. Then the ... -
Page 28: Bluetooth Communication Function (Kew 4105Dlbt Only)
11. Bluetooth communication (KEW 4105DLBT only) 11-1 Bluetooth communication KEW 4105DLBT can communicate with Android/iOS tablet devices via Bluetooth. You can check the measured results remotely on your device by installing the special application KEW Smart*(asterisk) in your device. This feature is available only on KEW 4105DLBT: unavailable on KEW 4105DL. First, download the special application "KEW Smart*" via the internet. -
Page 29: Features Of Kew Smart*(Asterisk)
● S ome tablet devices, even if the application runs properly, may fail to establish communication with the tester. Please use another tablet device and try to communicate with. If you still cannot confirm the connection, there may be some problem with the tester itself. Please contact your local KYORITSU distributor. ● T he Bluetooth word mark and logos are owned by Bluetooth SIG, Inc. and we, KYORITSU, are licensed by them for use. ● A ndroid, Google Play Store, and Google Maps are the trademark or registered trademark of Google Inc. -
Page 30: Battery Replacement
12. Battery replacement Replace the batteries as soon as the mark appears. # 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 31: Cleaning
# CAUTION Remove all batteries if the instrument is to be stored and will not be in use for a long period. In this case, when attaching the battery compartment cover, keep the right screw of the cover slightly loose. Right screw Fig. 11-2 This instrument has water-proof feature and has high sealing property, therefore, air pressure adjustment is necessary. Air pressure between inside and outside of the instrument can be balanced by loosening the right screw of the battery compartment cover. ... -
Page 32: Notes On Housing Case
# CAUTION ● The watertight feature may be degraded after prolonged use. T his feature works on fresh water and tap water only and is guaranteed as long as the following conditions are met. - Temperature of fresh water or tap water is 15 ‒ 35℃. - Ambient temperature is 15 ‒ 35℃. - D ifference in temperatures of water and instrument enclosure is within 5℃ ● Replace the waterproof packing if it is degraded. ● C heck the packing for deformation, cracks when washing the instrument and firmly secure the battery compartment cover when ... -
Page 33: How To Fit Strap Belt
15. How to fit strap belt The instrument is equipped with a strap belt to suspend from the neck to allow both hands to be used freely for easy and safe operation. Fig. 14-1 16. Cable reels 16-1. Operating instruction Connection ②... -
Page 34: Cable Replacement
Storage F irst, house the alligator clip onto the cable reel as follows. Then hold the grip of the cable reel with your left hand and slack the cable downward. Rotate the handle with your right hand for rewinding. Alligator clip Fig. 15-4 Fig. 15-5 Fig. 15-6 Plug cap can be housed in the center of the cable reel. 16-2. Cable replacement How to remove the cable Hook To replace the cable with a new one, first, pull out... - Page 36 DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations. 1-23 92-2259C...
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