Hioki FT6041 Instruction Manual
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Hioki FT6041 Instruction Manual

Earth tester
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FT6041
EARTH TESTER
Read carefully before use.
Keep for future reference.
When using the instrument for the
first time
Safety Information
Parts Names and Functions
Making Measurements
Feb. 2024 Edition 1
FT6041A961-00
Troubleshooting
p. 14
Troubleshooting
p. 23
Messages
p. 41
HIOKI FT6041A961-00
Instruction Manual
[600660730]
p. 120
p. 123
EN

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Summary of Contents for Hioki FT6041

  • Page 1 FT6041 Instruction Manual EARTH TESTER Read carefully before use. Keep for future reference. When using the instrument for the Troubleshooting first time Safety Information p. 14 Troubleshooting p. 120   Parts Names and Functions p. 23 Messages p. 123 ...
  • Page 2 HIOKI FT6041A961-00...

  • Page 3: Table Of Contents

    Precautions for Use ................17 Overview Product Overview ............21 Features ................21 Part Names and Functions ..........23 FT6041 main unit ..............23 FT9847 Signal Induction Clamp, CT9848 Clamp on Sensor............29 Preparing for Measurement How to Use the Carrying Case ........31 Inserting/Replacing Batteries ..........32 Connecting the Z3210 Wireless Adapter ......35...
  • Page 4 How to pull out the auxiliary earthing rods ....... 79 Various Capabilities Continuous Measurement Capability ......81 To enable the continuous measurement capability ....81 To turn the continuous measurement capability off ....81 Zero-Adjustment Capability ..........82 How to cancel the previous zero adjustment ......83 If an error is displayed .............. 83 HIOKI FT6041A961-00...
  • Page 5 Two-clamp earth-resistance measurement ......104 Low-resistance measurement ..........106 Ground-potential measurement ..........107 5.3 Capability Specifications ..........108 Factory default settings and setting backup ......114 5.4 Specifications of Optional Equipment ......115 FT9847 Signal Induction Clamp ..........115 CT9848 Clamp on Sensor............115 HIOKI FT6041A961-00...
  • Page 6 Two-clamp measurement ............129 Low-resistance measurement ..........129 Tips on the Three-pole Measurement ......130 Distance between earth electrodes ........130 Locations to drive the auxiliary earthing rods ......131 How to insert the auxiliary earthing rods ........ 132 Index Warranty Certificate HIOKI FT6041A961-00...

  • Page 7: Introduction

    Introduction Introduction Thank you for choosing the Hioki FT6041 Earth Tester. To ensure that you get the most out of this instrument over the long term, please read this manual carefully and keep it available for future reference. Please review the separate Operating Precautions before using this instrument.

  • Page 8: Checking Package Contents

    Carrying Case (for containing the measurement cables) × LR6 Alkaline battery Instruction Manual Operating Precautions (0990A907) The following products are supplied with the FT6041-91 only: FT9847 Signal Induction Clamp (for injecting measurement signals) Ω ± Operation-check resistor 1%, for FT9847)

  • Page 9: Optional Equipment (Sold Separately)

    The optional equipment listed below is available for the instrument. To purchase optional equipment, please contact your authorized Hioki distributor or reseller. Optional equipment is subject to change with no advance notice. Check Hioki’s website for the latest information. FT9847...
  • Page 10 Rated current: 2 A AC/DC (continuous) 9467 Large Clip Type Lead Indoor use, for four-terminal low-resistance measurement, cable length: 1.3 m Rated voltage: 60 V DC 9050 Earth Nets × A set of two, 300 mm 300 mm HIOKI FT6041A961-00...
  • Page 11 Optional Equipment (Sold Separately) C0208 Carrying Case For containing the instrument and clamps C0209 Carrying Case For containing the measurement cables HIOKI FT6041A961-00...

  • Page 12: Symbols And Abbreviations

    Indicates the product is protected throughout by double insulation or reinforced insulation. Indicates a fuse. Indicates a ground terminal. Indicates that the product can be used for direct current (DC). Indicates that the product can be used for alternating current (AC). HIOKI FT6041A961-00...
  • Page 13 % f.s.). Indicates the minimum display unit (in other words, the smallest digit that Digits can have a value of one) for a digital measuring instrument. Limit values (resolution) for digit errors are expressed using digits (dgt). HIOKI FT6041A961-00...

  • Page 14: Safety Information

    Wear electrically insulating personal protective equipment „ (PPE). Performing measurement using this instrument involves live-line work. Failure to wear PPE could cause the user to experience an electric shock. Wearing PPE is prescribed under applicable laws and regulations. HIOKI FT6041A961-00...
  • Page 15 Do not use a measuring instrument without a measurement „ category rating for measurements on mains. Otherwise, the user will suffer from a serious bodily injury or the instrument and the mains installation will be damaged. HIOKI FT6041A961-00...
  • Page 16 (CAT IV) EXAMPLE: Measurements on devices installed before the main fuse or circuit breaker in the building installation. Distribution panel Service entrance Service drop Internal wiring CAT II CAT III CAT IV Outlet Power meter Fixed installation HIOKI FT6041A961-00...

  • Page 17: Precautions For Use

    Doing so could damage the instrument or cause it to malfunction, resulting in bodily injury. CAUTION Do not subject the instrument to vibration or mechanical shock „ while transporting or handling it. Do not drop the instrument. „ Doing so could damage the instrument. HIOKI FT6041A961-00...
  • Page 18 Do not use the instrument with the optional connection „ cables connected for measurements that exceed any of the ratings marked on them. Using the product for measurements that exceed any ratings could cause the user to experience an electric shock. Use only Hioki-specified test leads with the instrument. „ Using an unspecified test lead could result in bodily injury or a short- circuit fault. HIOKI FT6041A961-00...
  • Page 19 Doing so will cause an arc flash, resulting in serious bodily injury or damage to the instrument or other equipment. Never touch the metal parts on test leads during „ measurement. Doing so will cause serious bodily injury or a short-circuit fault. HIOKI FT6041A961-00...
  • Page 20 If you find any battery abnormality (for example, leakage, „ odor, overheating, discoloration, and deformation) while using, charging, or storing batteries, stop using them immediately. Contact your authorized Hioki distributor or reseller. CAUTION Do not mix LR6 Alkaline batteries and nickel-metal hydride „ batteries. Doing so could cause the batteries to leak, damaging the instrument.

  • Page 21: Overview

    Overview 1.1 Product Overview The FT6041 is an earth resistance meter that measures resistance between a grounding conductor and the ground. Earthing works on power distribution lines and electrical installations are extremely important for preventing electric shocks and fires and protecting equipment. This instrument has multiple measuring capabilities that can make accurate measurement on various objects, which is especially useful for measuring earth resistance during earthing works.
  • Page 22 Drop-proof functionality (when covers with the protector) The instrument has a robust structure to withstand a drop to concrete from a height of 1 m. Measurement cable winder The winders supplied with measurement cables helps you prepare for measurement and clear up the product. HIOKI FT6041A961-00...

  • Page 23: Part Names And Functions

    Part Names and Functions 1.3 Part Names and Functions FT6041 main unit Front Terminal covers MEASURE button Measurement terminals Display Buttons Protector Rotary switch Use to start and stop an earth-resistance measurement and a low- resistance measurement. MEASURE button Extend...
  • Page 24 85 V or more. Two-pole measurement H (C2) E (C1) • The voltage measurement between the terminals is 30 V or more. Press to change a setting. ▼ The buttons are enabled when the ▲ ▼ symbol appears on ▲ the display. HIOKI FT6041A961-00...
  • Page 25 [<]) indicates that the object under An inequality sign ([>] measurement has a resistance beyond the measurable range (overrange). Indicates the ground-potential measurement is set to DC/AC auto- AUTO detection mode. CONT Indicates the continuous measurement function is enabled. HIOKI FT6041A961-00...
  • Page 26 5 5, p.  6 0, and p.  6 2) Indicates the terminals to which the measurement cables and test Terminal leads, and clamps are need to be connected. symbols These symbols blink when each electrode has a high resistance value. (p.  7 8) HIOKI FT6041A961-00...
  • Page 27 Indicates the on-display value is the earth resistance of Auxiliary Earth Electrode ES. Indicates the on-display value is the earth resistance of Auxiliary Earth Electrodes S. Indicates the on-display value is the earth resistance of Auxiliary Earth Electrodes H. HIOKI FT6041A961-00...
  • Page 28 For the compartment containing the batteries, fuse, and compartment cover the Z3210. Prevents water from entering the instrument. If this gasket deteriorates, you should replace the entire battery Gasket compartment cover, including the gasket, with a new one. Contact your authorized Hioki distributor or reseller. HIOKI FT6041A961-00...

  • Page 29: Ft9847 Signal Induction Clamp, Ct9848 Clamp On Sensor

    Barrier Barrier Rear (common to two models) Serial number The serial number consists of nine digits. The first two digits indicate the year of manufacture, while the second two digits indicate the month of manufacture. Do not remove this sticker because the number is important. HIOKI FT6041A961-00...
  • Page 30 Part Names and Functions HIOKI FT6041A961-00...

  • Page 31: Preparing For Measurement

    Commercially available pegs, which have sharp tips, could damage the carrying case. Do not wash carrying cases. „ Doing so could damage the carrying case. C0208 Carrying Case C0209 Carrying Case Always retract the knob of the winder before storing it in the carrying case. HIOKI FT6041A961-00...

  • Page 32: Inserting/Replacing Batteries

    Using the instrument with the battery compartment cover removed could result in personal injury. Do not short-circuit a battery. „ Do not disassemble a battery. „ Do not throw a battery into a fire or heat it up. „ Do not charge an alkaline battery. „ Doing so can cause the battery to explode, resulting in bodily injury. HIOKI FT6041A961-00...
  • Page 33 The battery compartment is sealed with the gasket. Remove one side of the battery compartment cover first, then remove the other for easy removal. Do not remove the gasket from the battery compartment cover. (p.  2 8) Remove all of the old batteries when replacing the batteries. Insert fresh batteries, paying attention to the polarity. Reattach the battery compartment cover. HIOKI FT6041A961-00...
  • Page 34 Lock the battery compartment cover. ° Turn the two fixing knobs clockwise 180 with a screwdriver or a coin to align LOCKED the letters with the triangle marks (). The correctly attached battery compartment cover can maintain the dust resistance and water resistance capabilities. Unlocked Locked HIOKI FT6041A961-00...

  • Page 35: Connecting The Z3210 Wireless Adapter

    Using the instrument with the battery compartment cover removed could result in bodily injury. CAUTION Before handling the Z3210, eliminate static electricity on your body „ by touching any metallic part, such as a doorknob. Failure to do so could cause static electricity to damage the Z3210. HIOKI FT6041A961-00...
  • Page 36 Lock the battery compartment cover. ° Turn the two fixing knobs clockwise 180 with a screwdriver or a coin to align LOCKED the letters with the triangle marks (). Correctly installing the battery compartment cover can maintain the dust resistance and water resistance capabilities. Use a flat-head screwdriver or another suitable tool to remove the Z3210. Unlocked Locked HIOKI FT6041A961-00...

  • Page 37: How To Use The L9846 Earth Nets Module

    Pull out the measurement cable from the winder. Connect the connectors of the pulled-out measurement cables to the measurement terminals of the instrument. Attach the crocodile clip to the other end of each measurement cable. Connect the crocodile clip to the terminal of each earth net module. HIOKI FT6041A961-00...
  • Page 38 Start a measurement. After completing the measurements, dry the sets of Earth Nets Module. Earth Nets Module is a consumable item. You can replace damaged earth nets and sponges with new ones. Contact your authorized Hioki distributor or reseller. HIOKI FT6041A961-00...

  • Page 39: If The Instrument Is Splashed With Water

    Check that there are no water drops in the measurement terminals. Do not use the instrument if water drops remain in the measurement terminals. Water dorps IMPORTANT Do not turn the rotary switch until the instrument is dry. Doing so when the instrument is wet could allow water to enter. HIOKI FT6041A961-00...

  • Page 40: In Case Of Condensation

    If the instrument condenses, such as when it returns to room temperature from a high-temperature, high-humidity environment, remove the battery compartment cover, fuse, and batteries. Dry it at room temperature for at least 24 hours to ensure correct measurements can be performed. HIOKI FT6041A961-00...

  • Page 41: Making Measurements

    „ measurements. Remove the test leads from an object under measurement „ before changing the position of the rotary switch. Failure to do so could cause a serious bodily injury, a short-circuit fault, or damage to the instrument. HIOKI FT6041A961-00...
  • Page 42 Doing so could damage the instrument. Do not use the FT9847 Signal Induction Clamp to measure current. „ Doing so could damage the FT9847. This clamp sensor is designed not for measuring current but is dedicated to injecting measurement signals into the FT6041. HIOKI FT6041A961-00...
  • Page 43 Not doing so will result in a loss of waterproof performance. • Clamp the CT9848 Clamp on Sensor around only one conductor. Clamping around two conductors or more causes the sensor to be unable to measure currents. HIOKI FT6041A961-00...
  • Page 44 Measurement using a test lead with a damaged sleeve attached could cause the user to experience an electric shock. Removing the sleeves Hold the base of the sleeve and pull it off. Store the removed sleeves for future use. Attaching the sleeves Insert the metal pin of a test lead through the sleeve and firmly push it all the way seated in. HIOKI FT6041A961-00...

  • Page 45: Measurement Procedure

    Execute a zero adjustment. See “4.2 Zero-Adjustment Capability” (p.  8 2). Set a threshold value. See “4.3 Setting Up the Comparator and Defining the Measurement Conditions” (p.  8 4). Connect the measurement cables or test leads to an object to be measured. Start a measurement. Finishing the measurement Turn the instrument off and remove the measurement cables or test leads from the object under measurement. HIOKI FT6041A961-00...

  • Page 46: Inspecting The Instrument Before Measurements

    Make visual check of the instrument. If damage is found, request repair.   T he measurement terminals do not have any foreign matter, such as sand, in them. Remove all foreign matter if any. If it cannot be removed, request repair. HIOKI FT6041A961-00...
  • Page 47 If the instrument indicates any value other than approx. 0 • A measurement cable or test lead has not been fully inserted. Fully insert it. • A measurement cable or a test lead may have a break. Replace it with a Hioki- specified one. The instrument may be damaged if the problem remains even after the measurement cable or test lead is replaced.
  • Page 48 Check that no foreign matter is caught between the ends and that the jaws can open and close smoothly. Clamp the FT9847 Signal Induction Clamp and the CT9848 Clamp on Sensor around the operation-check resistor to see if the instrument displays the acceptable value. See “3.9 Measuring Earth Resistance (Two-Clamp Measurement)” (p.  6 2). HIOKI FT6041A961-00...

  • Page 49: Measurement Function List

    Terminal Measurement)” (p.  7 1) Several earth-resistance measurement methods are available. The three-pole measurement is basically used to measure earth resistance. The simplified earth-resistance measurement method (two-pole measurement) is used if the three-pole measurement is unavailable. To measure earth resistance employing the three-pole measurement, two auxiliary earthing rods need to be driven into the ground as shown in the figure in “Making measurements” (p.  5 3). HIOKI FT6041A961-00...

  • Page 50: Defining The Measurement Conditions

    94 Hz, 105 Hz, or 111 Hz. When you want to make earth-resistance measurement under conditions closer to the commercial-power frequency, set the frequency to 55 Hz. Setting the distance Set the distance between the auxiliary earth electrodes used for the four-pole measurement. HIOKI FT6041A961-00...

  • Page 51: Measuring Earth Resistance (Three-Pole Measurement)

    In general, measurements on a large-scale earth electrode requires a large measurement current of about 20 A. Use a measuring instrument designed for measurements on large-scale earth electrodes (no measuring instrument available for this purpose from Hioki). HIOKI FT6041A961-00...
  • Page 52 Earth Nets. • In general, the auxiliary earth electrodes cannot be used on asphalt, which is an insulating material. However, measurement may be possible on porous asphalt, which has water penetrability. 9050 Earth Nets HIOKI FT6041A961-00...

  • Page 53: Making Measurements

    Drive an auxiliary earthing rod into the ground 10 m or more away from the earth electrode and connect the measurement cable (yellow). Drive another auxiliary earthing rod into the ground 10 m or more away from Auxiliary Earth Electrodes S and connect the measurement cable (red). HIOKI FT6041A961-00...
  • Page 54 • Position the yellow and red measurement cables about 100 mm away from each other to prevent them from overlapping. HIOKI FT6041A961-00...

  • Page 55: Measuring Earth Resistance (Three-Pole Mec Measurement)

    See “7.3 Tips on the Three-pole Measurement” (p.  1 30). Making measurements You will need: L9841 Measurement Cable (crocodile clip, black), L9845-31 Measurement Cable × (yellow), L9845-52 Measurement Cable (red), L9840 Auxiliary Earthing Rod 3, tape measure Yellow L9841 CT9848 Black 10 m or more HIOKI FT6041A961-00...
  • Page 56 • Do not measure earth resistance when the installation is in operation. IMPORTANT Pay attention to the positions of the measurement cable (black) and the CT9848. Incorrect connection causes measurements to be impossible. HIOKI FT6041A961-00...

  • Page 57: Measuring Ground Resistivity (Four-Pole Measurement)

    1.0 m to 50.0 m (settable in increments of 0.1 m) 3 ft. to 160 ft. (settable in increments of 1 ft.) To change the unit to foot (ft.), see “Changing the unit of length” (p. 58) HIOKI FT6041A961-00...

  • Page 58: Changing The Unit Of Length

    Making measurements You will need: L9841 Measurement Cable (crocodile clip, black), L9845-33 Measurement Cable (blue), L9845-31 Measurement Cable (yellow), L9845-52 Measurement Cable (red), × L9840 Auxiliary Earthing Rod 4, tape measure Black Blue Yellow b < 0.1 L HIOKI FT6041A961-00...
  • Page 59 The instrument makes measurements automatically in the following order: Ground-potential check → Auxiliary-earth-resistance check → Earth-resistance measurement The instrument displays the measured value and the symbol. Check the measured values. The on-display parameters can be changed after measurements. Press the button to switch the parameters. HIOKI FT6041A961-00...

  • Page 60: Measuring Earth Resistance (Four-Pole Mec Measurement)

    L9841 Measurement Cable (crocodile clip, black), L9845-33 Measurement Cable (blue), L9845-31 Measurement Cable (yellow), L9845-52 Measurement Cable (red), × CT9848 Clamp on Sensor (for detecting signals), L9840 Auxiliary Earthing Rod tape measure Blue Yellow L9841 CT9848 Black 10 m or more HIOKI FT6041A961-00...
  • Page 61 Press the button to switch the parameters. • The instrument can measure earth-resistance values correctly even if the earth electrodes are not disconnected from the installation. • Do not measure earth resistance when the installation is in operation. HIOKI FT6041A961-00...

  • Page 62: Measuring Earth Resistance (Two-Clamp Measurement)

    (Two-Clamp Measurement) This measurement method is used to measure earth resistance in multiple earthing points. Making measurements You will need: FT9847 Signal Induction Clamp (for injecting measurement signals), CT9848 Clamp on Sensor (for detecting measurement signals) FT9847 L ≥ 150 mm CT9848 HIOKI FT6041A961-00...
  • Page 63 Arrange the CT9845 so that the arrows on the FT9847 and CT9845 point in the same direction. Place the FT9847 and CT9848 150 mm or more apart to avoid measurement errors. Press the MEASURE button. The instrument makes measurements, displaying the measured value and the symbol. HOLD HIOKI FT6041A961-00...

  • Page 64: Measuring Earth Resistance Using A Simple Method (Two-Pole Measurement)

    Connect the instrument to either of the following: „ • The neutral side of an outlet with a line-to-ground voltage of 300 V or less • The wire on the neutral side of the breaker secondary side with a line-to-ground voltage of 150 V or less. Connection to any other points will cause the user to experience an electric shock. HIOKI FT6041A961-00...
  • Page 65 IMPORTANT The simplified measurement function of the instrument can be used to measure earth resistance with small inductance component. Thus, a resistance with which an inductance component of 3 mH or more is connected in series may not be accurately measured. HIOKI FT6041A961-00...

  • Page 66: Making Measurements

    You will need: L9787 Test Lead (optional) Example: Measuring the earth resistance at a breaker or an outlet using the neutral side Earth leakage breaker Home distribution panel Branch breaker Outdoor Indoor Primary Pole-mounted breaker transformer Black Central grounding terminal HIOKI FT6041A961-00...
  • Page 67 The on-display parameters can be changed after measurements. Press the button to switch the parameters. IMPORTANT Set the output voltage to 20 V if measured values fluctuate due to noise. However, doing so could cause the earth leakage breaker to trip; thus, check the sensitivity current of the earth leakage breaker before changing the output voltage setting. HIOKI FT6041A961-00...

  • Page 68: Measuring Low Resistance (Two-Terminal Measurement)

    Making measurements You will need: L9787 Test Lead (optional) Example: Checking the continuity of the earth wire. DANGER Do not make low-resistance measurements while the object „ to be measured is energized. Doing so will damage the instrument, resulting in bodily injury. Shut off the power to the object to be measured before measurements. HIOKI FT6041A961-00...
  • Page 69 L9787 Test Lead Black H (C2) terminal L9787 Test Lead Execute a zero adjustment. See “4.2 Zero-Adjustment Capability” (p.  8 2). Connect the L9787 Test Lead (black) with the earth electrode of an object to be measurement. Connect the L9787 Test Lead (red) with the neutral (N) side of commercial power. Press the MEASURE button. Extend the MEASURE button to make measurements continuously. Check the measured value. HIOKI FT6041A961-00...
  • Page 70 • If a capacitance component is connected in parallel with an object under measurement, correct measurement values may not be obtained. • The auto-ranging capability may not work stably depending on the object under measurement, such as motors, transformers, and coils. HIOKI FT6041A961-00...

  • Page 71: Measuring Low Resistance (Four-Terminal Measurement)

    9772 Pin Type Lead or 9467 Large Clip Type Lead (optional) Example: Checking the continuity of the earth wire DANGER Do not make low-resistance measurements while an object „ to be measured is energized. Doing so will damage the instrument, resulting in bodily injury. Shut off the power to the object to be measured before measurements. HIOKI FT6041A961-00...
  • Page 72 S (P2) terminal 9772 Pin Type Lead or 9467 Large Clip Type Lead (optional) H (C2) terminal Set the rotary switch to the 4WIRE position. Perform a zero adjustment. See “4.2 Zero-Adjustment Capability” (p.  8 2). Connect the L9787 Test Lead (black) with the earth electrode of an object to be measured. Connect the L9787 Test Lead (red) with the neutral (N) side of commercial power. HIOKI FT6041A961-00...
  • Page 73 • If a capacitance component is connected in parallel with an object under measurement, correct measurement values may not be obtained. • The auto-ranging capability may not work stably depending on the object under measurement, such as motors, transformers, and coils. HIOKI FT6041A961-00...

  • Page 74: When The [Noise] Symbol Appears

    (1) During earth-resistance measurements, the ground potential is high. (over 30 V rms or 42.4 V peak) (2) During low-resistance measurements, the inter-terminal voltage is high. (over 30 V AC, over 5 V peak, or under −5 V) If the NOISE symbol appears Since leak currents are flowing into the earth electrodes, disconnect any electric installations from the earth electrodes and then press the MEASURE button again. HIOKI FT6041A961-00...

  • Page 75: Measuring The Ground Potential

    After an earth-resistance measurement, press the button while the symbol is displayed to display the ground potential. In addition, adjust the rotary switch to another function then set its original position to unfreeze the display, allowing the present ground potential to appear. HIOKI FT6041A961-00...

  • Page 76: If A Terminal Symbol Blinks

    Indicates the on-display value is the earth resistance of Auxiliary Earth Electrode ES. Indicates the on-display value is the earth resistance of Auxiliary Earth Electrodes S. Indicates the on-display value is the earth resistance of Auxiliary Earth Electrodes H. Indicates the on-display value is the ground potential HIOKI FT6041A961-00...
  • Page 77 Ω 0 to 5 k 9.52 range) 13.48 range) Ω Ω Ω Ω Ω Ω Above 5 k to 50 k (300 range) 13.5 (300 range) Low-resistance measurement Inspect the probes for any disconnection from the objects being measured. HIOKI FT6041A961-00...

  • Page 78: Clearing Up The Product After Measurement

    Remove the measurement cable (black) from the earth electrode, wrap round it, and put it into the carrying case. See “2.1 How to Use the Carrying Case” (p.  3 1). HIOKI FT6041A961-00...

  • Page 79: How To Pull Out The Auxiliary Earthing Rods

    Pulling another auxiliary earthing rod put through the loop of the one driven in the ground will cause it to bend. Do not subject the auxiliary earthing rod to force from the side because it will bend. HIOKI FT6041A961-00...
  • Page 80 Clearing Up the Product After Measurement HIOKI FT6041A961-00...

  • Page 81: Various Capabilities

    The instrument measures earth resistance continuously. To switch the on- display parameters during a measurement, turn the continuous measurement capability off, then press the Fn button. Extend Press the right side Retract (or release) (continuous (single measurement) measurement) To turn the continuous measurement capability off Retract the MEASURE button during the continuous measurement. The continuous measurement stops. HIOKI FT6041A961-00...

  • Page 82: Zero-Adjustment Capability

    Set the rotary switch to a function position you want to use. The instrument displays the symbol when it has been zero-adjusted. Ω Hold the button button) for 1 s or more to cancel the previous zero adjustment. HIOKI FT6041A961-00...

  • Page 83: How To Cancel The Previous Zero Adjustment

    The instrument has a zero-adjustment acceptable scope of 10 or less for earth- Ω resistance measurement and 3 or less for low-resistance measurement. If the measured value exits the acceptable range, the instrument does not execute an zero adjustment, displaying the [Err] message and the symbol. HIOKI FT6041A961-00...

  • Page 84: Setting Up The Comparator And Defining The Measurement Conditions

    Ω Every time the button button) is pressed, the display switches. Voltage setting Frequency setting (for 4-, 3-, and 2- pole (for low-resistance measurements only) measurement only) Comparator setting Distance setting (for 4-pole measurement only) HIOKI FT6041A961-00...

  • Page 85: To Turn The Comparator Off

    With the instrument on, press the button several times to display the comparator screen. [COMP] symbol turns on. Press the ▼ button several times until the [oFF] message is displayed. Press the [Fn] MEASURE button to return to the measurement screen. HIOKI FT6041A961-00...

  • Page 86: Power-Saving Capability (Auto-Power Saving Mode)

    • The instrument cannot retain the power-saving setting. • After use, always turn the rotary switch to turn the instrument off. Even in auto- power saving mode, the instrument slightly drains the batteries. Automatic backlight-off capability The instrument turns the backlight off automatically after about 40 s of inactivity. When you are working continuously in a dark place, cancel the automatic backlight- off capability. How to cancel the Automatic backlight-off capability With the instrument off, turn the rotary switch while the Fn button (backlight button) is held. HIOKI FT6041A961-00...

  • Page 87: Wireless Communications Capability (Gennect Cross)

    Internet connection charges when downloading or using the application software. • GENNECT Cross may not run on some mobile devices. • The Z3210 uses the 2.4 GHz band wireless technology. Some devices may be unable to establish a wireless connection near other devices that use the same HIOKI FT6041A961-00...
  • Page 88 (the app can be paired with up to eight instruments). • Allow 5 s to 30 s for the instrument to pair with the app after the instrument is turned on. If the instrument fails to pair within 1 min., restart GENNECT Cross and turn it off and then on. HIOKI FT6041A961-00...

  • Page 89: Z3210-To-Excel Direct Data Entry Function (Excel Direct Input Function, Hid Function)

    See “2.3 Connecting the Z3210 Wireless Adapter” (p. 35). Turn the instrument on by turning the rotary switch while pressing the ▼ ▲ buttons. Press the ▼ ▲ buttons to choose between the [on] [oFF] messages. Press the SET button to confirm. The instrument is turned off automatically. HIOKI FT6041A961-00...

  • Page 90: Confirming The Hid Setting

    3. Use the Instrument Setting of GENNECT Cross to reconnect the instrument. Confirming the HID setting Turn on the instrument by turning the rotary switch while pressing the ▼ ▲ buttons. Turn the rotary switch to turn the instrument off. Visit the Z3210 website for more information at https://z3210.gennect.net. https://z3210.gennect.net HIOKI FT6041A961-00...

  • Page 91: Displaying All Segments On The Display

    Press any button. The instrument enters normal measurement mode. The serial number consists of nine digits. The first two digits indicate the year of manufacture, while the second two digits indicate the month of manufacture. Example in the figure below: manufactured in December 2023 First six digits Last three digits (Example of a serial number: 231256789) HIOKI FT6041A961-00...

  • Page 92: Displaying The Firmware Version Number

    Set the rotary switch to the 3POLE+Clamp position while the instrument displays the serial number. Turn the rotary switch to turn the instrument off. Firmware updating capability The firmware of the instrument can be updated using GENNECT Cross (free-of-charge application). For more information, see GENNECT Cross website. Requirement GENNECT Cross Version 1.8 or later Instrument firmware Version 2.00 or later HIOKI FT6041A961-00...

  • Page 93: Specifications

    Drop-proof Drop height: 1 m, impact surface: concrete functionality (when covered with the protector) The instrument with nickel-metal hydride batteries inserted is not drop- proof. HIOKI FT6041A961-00...
  • Page 94 1.9D in.) (including the protector, excluding the measurement terminal covers) Weight Approx 765 g (27 oz.) (including batteries and the protector, excluding other accessories) Product warranty 3 years period Accessories See “Checking Package Contents” (p.  8 ). Optional equipment See “Optional Equipment (Sold Separately)” (p.  9 ). HIOKI FT6041A961-00...

  • Page 95: Input, Output, And Measurement Specifications

    H (C2) terminal. • Clamp terminal Used to detect the current during MEC measurement. Maximum rated line- 100 V AC/DC (measurement category IV) to-ground voltage 150 V AC/DC (measurement category III) 300 V AC/DC (measurement category II) Anticipated transient overvoltage: 2500 V HIOKI FT6041A961-00...
  • Page 96 400 A/m or less, DC and a frequency of 50 Hz and 60 Hz Accuracy guarantee Accuracy guarantee duration: 1 year conditions Accuracy guarantee temperature and humidity range: ° ± ° ° ± ° C (73 F), 80% RH or less HIOKI FT6041A961-00...

  • Page 97: Earth-Resistance Measurement (Four-Pole Measurement, Three-Pole Measurement, Two-Pole Measurement)

    9 s or less (19 s or less for a measurement frequency of 55 Hz) • Three-pole measurement 6 s or less (13 s or less for a measurement frequency of 55 Hz) • Two-pole measurement 3 s or less (5 s or less for a measurement frequency of 55 Hz) HIOKI FT6041A961-00...
  • Page 98 30% rdg Operation uncertainty (applicable to three-pole and four-pole measurements) Ω Ω 5.00 to 300.0 k ± Guaranteed range of operation (the range in which operation uncertainty within uncertainty is guaranteed, applicable to four-pole measurement or three-pole measurement) HIOKI FT6041A961-00...
  • Page 99 30% rdg (applicable to three-pole and four-pole Operation uncertainty measurements) Ω Ω 5.00 to 300.0 k ± Guaranteed range of operation (the range in which operation uncertainty within is guaranteed, applicable to four-pole measurement uncertainty or three-pole measurement) HIOKI FT6041A961-00...
  • Page 100 For a resistance of more than 100 k Accuracy not specified Not applicable to the two-pole measurement. The upper limit is equal to the acceptable resistance of the auxiliary earth electrode. Effects of system Not applicable frequency (E Effects of system Not applicable voltage (E HIOKI FT6041A961-00...
  • Page 101 Calculated by the following equation. cos θ (correction applied only when θ is negative) (θ: difference between the measurement current phase and voltage Ω signal phase; the [>300.0] message blinks and the segment ° appears when θ is 90 Ω Zero-adjustable or less range Negative-resistance Displays absolute values. value processing HIOKI FT6041A961-00...

  • Page 102: Mec Function (Four-Pole Measurement Using A Clamp, Three-Pole Measurement Using A Clamp)

    Three-pole measurement 8 s or less (16 s or less for a measurement frequency of 55 Hz) Influence quantity See “Range configuration (auto-ranging)” (p.  9 8). The influence quantity conform to that of earth-resistance measurement, as well as the four-pole, three-pole, and two-pole measurement. Ω Zero-adjustment or less applicable range HIOKI FT6041A961-00...
  • Page 103 Ω Four-pole measurement The smallest range that meets both the R and R values is automatically selected. Applicable after a zero adjustment The upper limit is equal to the acceptable resistance of the auxiliary earth electrode. HIOKI FT6041A961-00...

  • Page 104: Two-Clamp Earth-Resistance Measurement

    400 Hz 0 V to 3 V Accuracy Acceptable ground 3 V rms (direct current or sine wave) potential Effects of the Not applicable resistance of the auxiliary earth electrodes (E Effects of system Not applicable frequency (E Effects of system Not applicable voltage (E HIOKI FT6041A961-00...
  • Page 105 7% rdg 3 dgt 35% rdg uncertainty A) The accuracy of the higher range is adopted for measured values on a range boundary. ± Operation uncertainty 30% rdg Guaranteed range of Ω Ω 3.00 to 200 operation uncertainty HIOKI FT6041A961-00...

  • Page 106: Low-Resistance Measurement

    2 dgt (0.20 to 10.00 ± Operation uncertainty 30% rdg Guaranteed range of Ω Ω to 2 operation uncertainty Applicable after a zero adjustment ° (Zero adjustment is required when the ambient temperature has changed by 1 C or more.) HIOKI FT6041A961-00...

  • Page 107: Ground-Potential Measurement

    C and 50 C to ° Range configuration Display range: 30 V Maximum displayable value: 30.0 V Resolution: 0.1 V Accuracy ± ± 1.3% rdg 4 dgt for DC ± ± 2.3% rdg 8 dgt for 50 Hz and 60 Hz HIOKI FT6041A961-00...

  • Page 108: Capability Specifications

    Over +30 V is within a range Under −30 V ES (P1) E (C1) E (C1) of −30.0 V to terminals terminals terminals 30.0 V, the value is displayed. When the measured value exits the above ranges, the [> 30 V] message (unsigned) is displayed. HIOKI FT6041A961-00...
  • Page 109 The unit of length can be switched between the two kinds of units: meter (m) and foot (ft). Procedure 1. While holding the button, turn the instrument on. 2. While the serial number is displayed, hold the button until the [Unit] message appears. 3. Use the ▲ and ▼ buttons to switch between the two kings of units: meter (m) and foot (ft). 4. Press the SET button to confirm. The screen changes to the measurement screen. HIOKI FT6041A961-00...
  • Page 110 30 range, without the Z3210 installed) Ω About 3 hours (three-pole measurement, auxiliary earth resistance of 100 , measuring Ω Ω a resistance of 10 using the 30 range, with the Z3210 installed, using wireless communications) HIOKI FT6041A961-00...
  • Page 111 (1) Earth-resistance value of the earth electrode (2) Ground potential — Three-pole measurement (including the MEC function) Displayed content Symbol On-display symbol (1) Earth-resistance value (2) Earth-resistance value of Auxiliary Earth Electrodes S (3) Earth-resistance value of Auxiliary Earth Electrodes H (4) Ground potential — HIOKI FT6041A961-00...
  • Page 112 (15) HID function switching capability (only with the Z3210 installed) Operation The HID function of the Z3210 can be turned on and off. How to operate Turn the instrument on by rotating the rotary switch while pressing the ▼ ▲ buttons. Use the ▼ or ▲ button to turn the HID function on or off. After pressing the SET button to confirm, the instrument is automatically turned off. HIOKI FT6041A961-00...
  • Page 113 Zero-adjustment symbol appears. effectiveness indication Auxiliary earth electrode A relevant terminal symbol ( , or ) blinks. state indication Clamp state indication symbol blinks. Ground potential DC/AC [AUTO] symbol appears when the auto-detection is enabled. auto-detection on/off indication HIOKI FT6041A961-00...

  • Page 114: Factory Default Settings And Setting Backup

    Factory default setting Setting backup Automatic backlight-off Output voltage 30 V (8 V for two-pole measurement) Measurement frequency 128 Hz Distance 10.0 m Comparator Ω Reference value: 100 (On/off, set value) Zero adjustment (On/off, zero-adjustment value) Wireless communications (On first startup after the Z3210 (On/off) capability setting is installed) HIOKI FT6041A961-00...

  • Page 115: Specifications Of Optional Equipment

    Specifications of Optional Equipment 5.4 Specifications of Optional Equipment FT9847 Signal Induction Clamp Application purpose Dedicated to the FT6041 Earth Tester, for injecting measurement signals Operating environment Indoor use, outdoor use, pollution degree 2, altitude up to 2000 m (6562 ft.) ° ° ° ° Operating temperature −25 C to 65 C (−13...
  • Page 116 600 V AC (measurement category III) ground voltage 300 V AC (measurement category IV) Anticipated transient overvoltage: 6000 V Output connector Water-proof connector for exclusive use on the FT6041 Accuracy guarantee Accuracy guarantee duration: 1 year conditions Number of times the sensor can be opened/closed:...

  • Page 117: Maintenance And Service

    Hioki calibrate the instrument accordingly. Backing up your data When repairing or calibrating the instrument, Hioki may reset it (factory reset). It is recommended to back up (save/write) data such as the settings and measurement data before requesting service.

  • Page 118: Cleaning

    If the instrument becomes dirty, wipe it clean with a soft cloth „ moistened with water or a neutral detergent. Solvents such as benzene, alcohol, acetone, ether, ketone, thinners, or gasoline could deform or discolor the instrument. Wipe the display gently with a soft, dry cloth. HIOKI FT6041A961-00...

  • Page 119: Limited-Life Parts And Consumables

    The recommended replacement cycle does not guarantee regular operation within the product warranty period. Protector The protector is available as a service part. Contact your authorized Hioki distributor or reseller. Disposing of the instrument Dispose of the instrument by local regulations.

  • Page 120: Troubleshooting

    Troubleshooting 6.2 Troubleshooting If damage is suspected, read the “Before returning the instrument for repair” (p.  1 20) section before contacting your authorized Hioki distributor or reseller. If this does not help you, contact your authorized Hioki distributor or reseller. Before returning the instrument for repair If the instrument is not operating correctly, check the following items: (1) The instrument cannot be turned on.
  • Page 121 Drive auxiliary earthing rods into the ground before measurements instead of using the auxiliary electrodes for measurement. (7) The instrument generates a slight noise inside during measurement. The oscillator circuit inside the instrument generates the noise. This is not a failure. HIOKI FT6041A961-00...
  • Page 122 • Since asphalt is an insulator, measurements are not possible with an earth net. (10) An auxiliary earthing rod has been bent. It is recommended to purchase the L9840 Auxiliary Earthing Rod. (Commercially available pegs have sharp tips, which may damage the carrying cases.) HIOKI FT6041A961-00...

  • Page 123: Messages

    [Err8] Wireless Adapter” (p.  3 5). failure; Z3210 or hardware failure). If the error persists, the instrument has a failure. Contact your authorized Hioki distributor or reseller to ask for repair. GENNECT Cross failed to Use GENNECT Cross to update the [Err9] update the instrument.

  • Page 124: Replacing The Fuse

    When the test leads are connected to an object under measurement, the battery fittings are considered to carry a high voltage. After replacing the batteries, attach the battery compartment „ cover and lock the fixing knobs before using the instrument. Using the instrument with the battery compartment cover removed may lead to bodily injury. In addition, the cover will not be secured unless the fixing knobs of the battery compartment cover are locked. HIOKI FT6041A961-00...
  • Page 125 Do not use the tip of a test lead to remove the fuse. „ Doing so could bend the tip of the test lead. You will need: • Phillips-head screwdriver (No. 2), flat-blade screwdriver, or coin • Hioki-specified fuse Disconnect the measurement cables from the instrument. Turn the rotary switch to turn the instrument off. Unlock the battery compartment cover. °...
  • Page 126 Lock the battery compartment cover. ° Turn the two fixing knobs clockwise 180 with a screwdriver or a coin to align the letters LOCKED with the triangle marks (). If not attached correctly, the cover cannot maintain the dust resistance and water resistance capabilities. Unlocked Locked HIOKI FT6041A961-00...

  • Page 127: Appendix

    In addition, high earth resistances of auxiliary earth electrodes reduce the measurement current, making the instrument susceptible to noise, such as the ground potential. The instrument employs a system less susceptible to these disturbances, allowing accurate measurement under adverse conditions. HIOKI FT6041A961-00...

  • Page 128: Measurement Principle

    The earth resistance of the Electrode E, R is calculated from the measured current I and voltage I . AC voltage source Ammeter Voltmeter × V = R Electrode E (C1) Electrode S (P2) Electrode H (C2) = V/I HIOKI FT6041A961-00...

  • Page 129: Two-Clamp Measurement

    Low-resistance measurement The instrument flows a current I through the object under measurement and measures the voltage generated between the measurement terminals V to obtain the resistance of the object , which is calculated by dividing the inter-terminal voltage V by applied current I. HIOKI FT6041A961-00...

  • Page 130: Tips On The Three-Pole Measurement

    If no horizontal part is found, which occurs because the measurement distance is insufficient, drive Auxiliary Earthing Rods S (P) and H (C) far away. Fig. (a) Fig. (b) l  Horizontal part H (C) Ground surface S (P) Resistance area of Resistance area of the earth resistance Auxiliary Earthing Rod H l  under measurement (C) and earth resistance HIOKI FT6041A961-00...

  • Page 131: Locations To Drive The Auxiliary Earthing Rods

    • Auxiliary Earthing Rod S (P) is separated 5 m or more from both Earth Element E and Auxiliary Earthing Rod H (C). • The angle at which the lines connecting Points E and H (C) and Points E and S (P) ° meet is 29 or less. S (P) H (C) ° HIOKI FT6041A961-00...

  • Page 132: How To Insert The Auxiliary Earthing Rods

    If the ground is too hard to insert them by hand, use a hammer to drive them into the ground perpendicularly. Hammering an auxiliary earthing rod too hard may result in bending it. If it cannot be driven into the ground with gentle taps, use the optional 9050 Earth Nets for measurement. HIOKI FT6041A961-00...

  • Page 133: Index

    Zero adjustment capability......82 GENNECT Cross ........87 Ground resistivity Four-pole measurement ......57 HID function ..........89 Low resistance Four-pole measurement ......71 Two-pole measurement ......68 Measurement function ........ 49 Measurement principle ......128 MEC ............55 HIOKI FT6041A961-00...
  • Page 134 Index HIOKI FT6041A961-00...
  • Page 135 HIOKI FT6041A961-00...
  • Page 136 HIOKI FT6041A961-00...

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