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2.8 Low Resistance Measurement

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The comparator function can be used during low resistance
measurement.

See:

“2.4 Configuring the Comparator” (p.24)

Ex. Checking the continuity of ground wiring

If an additional operating circuit is connected in parallel to the
circuit under measurement, the measurement error may occur
due to the effects of impedance of the circuit connected in paral-
lel or transient currents.

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Summary of Contents for IR4051

Page 1: ...s code to watch an instructional video Carrier charges may apply EN IR4052 INSULATION TESTER IR4051 Instruction Manual May 2018 Revised edition 7 IR4051A981 07 18 05H IR4053 www com information itm com 1 800 561 8187 ...

Page 2: ...unctions of Parts 15 1 4 Using a Carrying Case 20 Chapter 2 Measurement Procedures 21 2 1 Measurement Preparations 21 2 2 Pre measurement inspection 22 2 3 Inspecting the Instrument When Using the L9788 10 Test Lead with Remote Switch Red 23 2 4 Configuring the Comparator 24 2 4 1 Setting the Comparator 25 2 4 2 Canceling the Comparator 25 IR4051A981 07 www com information itm com 1 800 561 8187 ...

Page 3: ...s 35 2 6 Discharging Function 36 2 7 Voltage Measurement 37 2 7 1 Negative Voltage Detection 39 2 8 Low Resistance Measurement 40 2 9 PV Measurement 42 2 10 Auto power save power saving function 50 2 11 Auto backlight off 50 Chapter 3 Specifications 51 Chapter 4 Maintenance and Service 63 4 1 Troubleshooting 63 4 2 Replacing Batteries or Fuse 68 4 3 Replacing the Pin Option 70 4 4 Cleaning 70 Appe...

Page 4: ...n you receive the instrument inspect it carefully to ensure that no damage occurred during shipping If damage is evident or if it fails to operate according to the specifications contact your authorized Hioki distributor or reseller When transporting the instrument use the original packing materials in which it was shipped and pack in a double carton Damage occurring during transportation is not c...

Page 5: ...eries Do not use for any other purpose Model Name Insulation Tester 1 Version 10 11 Accessories L9787 Test Lead 1 L9788 11 Test Lead Set with Remote Switch 1 C0100 Carrying Case 1 Included with the IR4052 Instruction manual 1 Neck strap Included with the IR4051 and IR4053 1 LR6 alkaline battery 4 IR4051 IR4053 IR4052 www com information itm com 1 800 561 8187 ...

Page 6: ...or the IR4052 ª L9787 Test Lead L9788 10 Test Lead with Remote Switch Red and L9788 11 Test Lead Set with Remote Switch are all exclusively designed for the HIOKI IR4000 series Do not use for any other purpose L9788 90 Tip Pin Pin length 123 mm and 65 mm from the tip has width 2 6 mm L9788 92 Breaker Pin L9788 11 Test Lead Set with Remote Switch L9787 91 Breaker Pin L9788 10 Test Lead with Remote ...

Page 7: ... damage to the instrument Be certain that you understand the instructions and precautions in the man ual before use With regard to the electricity supply there are risks of electric shock heat generation fire and arc discharge due to short circuits If persons unfamiliar with electric ity measuring instrument are to use the instrument another person familiar with such instruments must supervise ope...

Page 8: ...ed with the symbol before using the relevant function Indicates that dangerous voltage may be present at this terminal Indicates a double insulated device Indicates a grounding terminal Indicates DC Direct Current Indicates AC Alternating Current DO NOT USE IN DISTRIBUTION SYSTEMS WITH VOLTAGES HIGHER THAN AC660V Indicates that incorrect operation presents an extreme hazard that could result in se...

Page 9: ... to display it on the appliance under Article 11 2 of Directive 2002 96 EC WEEE Other Symbols Indicates a prohibited action p Indicates the location of reference information Indicates that descriptive information is provided below Indicates a function of the IR4051 Insulation Tester Indicates a function of the IR4052 Insulation Tester Indicates a function of the IR4053 Insulation Tester IR4051 IR4...

Page 10: ...onment designated with a higher numbered category than that for which the instrument is rated could result in a severe accident and must be carefully avoided Use of a measurement instrument that is not CAT rated in CAT II to CAT IV measurement applications could result in a severe accident and must be carefully avoided Accuracy Measurement categories CAT II Primary electrical circuits in equipment...

Page 11: ...ccident confirm that the white or red portion insulation layer inside the cable is not exposed If a color inside the cable is exposed do not use the cable Setting up the Instrument Avoid the following locations that could cause an accident or damage to the instrument Exposed to direct sunlight Exposed to high temperature In the presence of corrosive or explosive gases Exposed to water oil other ch...

Page 12: ...this instrument Please refer to the Specifications for the rating performance of this instrument Before attaching to or removing the test lead from the instrument please remove the Test Lead from the tested objected and turn the rotary selector to OFF Test leads should only be connected to the secondary side of a breaker so the breaker can prevent an accident if a short circuit occurs Connections ...

Page 13: ...n Such persons should avoid even proximity to the 9804 02 as it may be dangerous Medical device operation could be compromised presenting a hazard to human life Do not bring the 9804 02 near magnetic media such as floppy disks magnetic cards pre paid cards or mag netized tickets Doing so may corrupt and may render them unusable Furthermore if the 9804 02 is brought near precision electronic equipm...

Page 14: ...from physical shock when transporting and handling Be especially careful to avoid physical shock from dropping Do not bring the tips of test leads into contact with the control terminal that is used to connect a test lead with a remote control switch Doing so may damage the instrument Do not slant the instrument or place it on top of an uneven surface Dropping or knocking down the device can cause...

Page 15: ...roved response speeds compared to previous models it can be used as a pointer type device Enhanced comparator function Since the process from the start of measurement to a PASS FAIL judgment is extremely fast the instrument is suitable for tester continuity check use The display will turn red when a FAIL judgment results Low variation in measured values The instrument generates little variation in...

Page 16: ...ster there is no need to switch to a card tester when you need to measure voltage User selectable number of display digits The instrument s number of display digits can be changed IR4052 PV measurement function The PV measurement allows accurate insulation resis tance measurements of a solar panel IR4053 www com information itm com 1 800 561 8187 ...

Page 17: ...ustment for the low resis tance range Press this key to change the number of display digits for the insulation resistance range IR4052 RELEASE key Press this key before measurement to set the instrument to the 500 V or 1000 V range to prevent erroneous application of the test signal COMP key Press this key to set the compar ator s judgment reference value Live circuit indicator Lights up when volt...

Page 18: ... with the V range is DC Turns on when the voltage measured with the V range is AC Flashes when the measured value is less than the minimum display value Flashes when the measured value is greater than the maximum display value Lights up when the measured value is held Turns on when the comparator judgment is PASS good See 2 4 1 Setting the Comparator p 25 Turns on when the comparator judgment is F...

Page 19: ...gits See 2 5 3 Switching the Number of Display Digits p 32 Turns on when 1 minute has passed since the start of insulation resistance measurement Indicates that the resistance value on the bottom of the display is a 1 minute value the measured value 1 minute after the start of measurement See 2 5 4 Displaying 1 min Values p 34 Lights up when the comparator function is enabled See 2 4 Configuring t...

Page 20: ...tage to be applied will be determined 500V 1000V key PV range is used to switch between 500V and 1000V Other functions are same with the ones for IR4051 and IR4052 IR4053 A measured value or a comparator reference IR4053 Display Lit when PV measurement mode is selected Lit when 500 V range is selected in PV measure ment mode Lit when 1000V range is selected in PV measure ment mode IR4052 www com i...

Page 21: ...ill light up as red Light Is linked to the instru ment s backlight I1 8 I3 0 35 Enlarged view of pin 16 Unit mm The Insulation Resistance Tester s MEASURE key will still be available even when this test lead is connected to the Insulation Resistance Tester When connected to the Insulation Resistance Tester take note that a test voltage will be discharged even when the MEASURE key of the Tester is ...

Page 22: ... attached to the metal pins at the ends of the test leads To prevent a short circuit accident be sure to use the test leads with the sleeves attached when performing measurements in the CAT III measurement category Remove the sleeves from the test leads when performing measure ments in the CAT II measurement category The instrument can be used with the sleeves removed when measuring the secondary ...

Page 23: ...he black test lead to the EARTH terminal and the red test lead to the LINE terminal Pass the ring on both ends of the supplied strap through each of the four holes in the instrument Attaching the strap IR4051 IR4053 Attach the strap securely to the four fittings on the instrument If insecurely attached the instrument may fall and be damaged when carrying www com information itm com 1 800 561 8187 ...

Page 24: ...le exposed Checking the remaining battery life Checking the test lead No Exposed 1 Use the rotary selector to select Insulation Resis tance 2 Short the test lead tips 3 Press the MEASURE key Does the display show 0 M Yes Inspection complete Please read the Operating Precautions p 9 before use The battery indicator is flashing There is battery life remaining The following issues may be occurring Th...

Page 25: ...ower of the Insulation Resistance Tester is turned off 2 Plug the test lead securely into the LINE terminal of the Insulation Resistance Tester 3 Short circuit the tips of the test leads 4 Use the rotary selector to select Insulation Resistance 5 Upon pressing the MEASURE key on the L9788 10 verify that the L9788 10 s MEASURE key turns red when the instrument s live wire warning is displayed and t...

Page 26: ... Test Lead with Remote Switch Red The L9788 10 incorporates an LED that turns green for PASS judgments and red for FAIL judgments For more information about valid comparator settings see Valid judgment reference values p 26 In the insulation resistance and PV ranges measured values that are greater than or equal to the judgment reference value result in a PASS judgment The buzzer will sound in the...

Page 27: ...which you wish to set the judgment reference Note In 500 V 1000 V range press to release the lock In PV range select the voltage to be applied with and press to release the lock 3 Pressing causes to flash and displays the resistance value that will be used as the judgment reference The IR4051 will display Press or to select the judgment reference 4 If you do nothing for about 2 seconds after you s...

Page 28: ...V 0 01 0 02 0 03 0 04 0 05 M 0 1 0 2 0 3 0 4 0 5 1 1 2 3 4 5 10 125 V 0 1 0 2 0 3 0 4 0 5 1 1 2 3 4 5 10 20 250 V 0 1 0 2 0 3 0 4 0 5 1 1 2 3 4 5 10 20 30 40 50 500 V PV 500V 0 1 0 2 2 0 3 0 4 0 5 1 1 2 3 4 5 10 20 30 40 50 100 1000 V 3 PV 1000V 0 1 0 2 0 3 0 4 2 0 5 1 2 3 4 5 10 1 20 30 40 50 100 200 300 400 500 0 1 0 2 0 3 0 4 0 5 0 6 1 2 3 4 5 6 10 20 1 30 40 50 60 100 200 www com information i...

Page 29: ... after measurement p 36 Do not attempt to measure insulation resistance on a live conductor Doing so could damage the instrument or cause an accident that might result in injury or death Always turn off power to the conductor being measured before starting Insulation resistance is the ratio of leakage current to applied voltage and is therefore unstable Depending on the specific object being measu...

Page 30: ... a lock function This function will prevent the test voltage from being output even if the MEASURE key is pressed while the rotary selector is set to the 500 V 1000 V or PV range Releasing the lock 1 Setting the rotary selector to the 500 V 1000 V or PV range will cause IR4052 or IR4051 IR4053 to light up and will flash On Flashing www com information itm com 1 800 561 8187 ...

Page 31: ...return to the state described in Step 1 when 1 minute elapses after the last measurement or operation Press to release the lock 2 Press to turn off or as well as disabling the lock The display will also change to the measurement screen Off Off www com information itm com 1 800 561 8187 ...

Page 32: ...ack 2 Set the rotary selector to a test voltage of 50 V to 1000 V In the 500 V or 1000 V range press to release the lock 3 Connect the black test lead to the ground side of the object being measured 4 Connect the red test lead to the line to be measured 5 Press the MEASURE key To make continuous measurements pull the button up 6 Read the value after the indicator has stabilized 7 Turn off the MEAS...

Page 33: ... will start 9 When disappears measurement is complete During measuring do not selector over to the other function The instrument will return to the locked state when about 1 minute of no operation elapses in the 500 V and 1000 V ranges To continue measurement press again to release the lock www com information itm com 1 800 561 8187 ...

Page 34: ...display digits Press to switch the number of display digits Each time you press the number of display digits will change as shown in the following table You can see what number of digits is currently being displayed by looking at on the bottom of the display When the number of display digits is in 100 count or 10 count mode lower digits that are not displayed are discarded For example a reading of...

Page 35: ...ter s graduations are shown Select this setting when you wish to use the instrument as a pointer type insulation ohmmeter When the comparator is set values near the comparator setting will be displayed in 1 000 count display mode regardless of the display mode setting Range Maximum display value 1 000 count display mode 100 count display mode 10 count display mode 50 V 100 M 10 M 125 V 250 M 20 M ...

Page 36: ...ue that is held will be shown on the bottom of the display No value is shown if less than 1 minute has elapsed since the start of measurement Regardless of the selected display mode 1 min values are always displayed in 1 000 count display mode Use this function when measuring targets that include a capacitance component IR4052 This function is enabled only when the comparator is set to off 1 min v...

Page 37: ...urement ᒁ 4 3 2 1 7 6 5 10 9 8 2 5 5 Voltage Characteristic of Measuring Terminals Rating 50 V Rating 125 V Rating 250 V Rating 500 V Rating 1000 V Voltage induced V Resistor to be measured M www com information itm com 1 800 561 8187 ...

Page 38: ...tem being measured release the MEASURE key 2 The built in discharge circuit automatically discharges the item On the IR4052 the amount of remaining bar graph will decrease when the instrument is discharged 3 The discharge will end when the disappears The time required for discharge depends on the capacitance value Measurement of a solar panel may fail to turn off because the voltage generated by t...

Page 39: ...short circuit occurs The maximum input voltage is 600 V DC AC 600 V AC 1000 V DC for IR4053 Attempting to measure voltage in excess of the maximum input could destroy the instrument and result in personal injury or death The maximum rated voltage between input terminals and ground is 600V DC AC CAT III Attempting to measure voltages exceeding 600 V with respect to ground could damage the instrumen...

Page 40: ...the red test lead to the line side of the breaker 4 Read the value after the indicator has stabilized 1 2 3 4 LINE EARTH Caution MEASURE key Do not press the Source primary side Load secondary side Always connect the test lead to the secondary side of the breaker During measuring do not selector over to the other function For waveforms other than sine waves some errors may occur www com informatio...

Page 41: ...default is set to ON Setting method IR4053 1 Hold and set the rotary switch to V 2 and V blink and ON or OFF will be indicated 3 Pressing switches between ON and OFF ON When measured voltage is 1 V or lower the dis play lights in red and white alternately OFF Disables this function When no operation is made until approximately two seconds after ON or OFF is selected the setting chosen will be fixe...

Page 42: ...off the MEASURE key to hold the measured value 5 Press 6 Connect the test lead to the ground side of the object being measured 7 Press the MEASURE key and read the displayed value 8 Turn off the MEASURE key after using Zero adjustment can be performed with readings of up to a maximum of 3 When the reading exceeds 3 Err 1 will be displayed and zero adjustment will not be possible Wire the instrumen...

Page 43: ... Configuring the Comparator p 24 Ex Checking the continuity of ground wiring If an additional operating circuit is connected in parallel to the circuit under measurement the measurement error may occur due to the effects of impedance of the circuit connected in paral lel or transient currents www com information itm com 1 800 561 8187 ...

Page 44: ...e PV measurement is used to measure insulation resistance between a solar panel and ground Use normal insulation resistance range to measure the insulation resistance between an output terminal of a solar panel connection box and ground and between a power conditioner and ground 2 9 PV Measurement Do not short circuit two wires to be measured by bringing the metal part of the test lead into contac...

Page 45: ...nel be sure to turn OFF disconnect switches to remove the solar panel from power conditioner Do not attempt to measure insulation resistance on a live conductor Doing so could damage the instrument or cause an accident that might result in injury or death Always turn off power to the conductor being measured before starting Solar panels always generate power and a dangerous voltage during the day ...

Page 46: ...orted should use an insulation resistance range other than PV range During hours such as in the nighttime while a solar panel is not generating power make measurements with P N shorted Do not make any measurement if any of the bypass diodes of the solar panel has failed Doing so may damage the solar panel www com information itm com 1 800 561 8187 ...

Page 47: ...nel to ground capacitance is larger it may take time until measured values become stable The PV measurement function does not comply with EN61557 requirements To perform measurements in conformity with EN61557 select the insulation resistance range If open voltage of solar cell string is higher than test voltage accurate measurement cannot be achieved PV 500 V range should be used with an open vol...

Page 48: ...ion may be different from actual generator 1 Turn OFF the main switch of the connection box to be disconnected from power conditioner 2 Turn OFF all disconnect switches used for strings 3 If any arrester is used for measuring path disconnect it As following figure does not use an arrestor for the string of disconnect switch there is no need to disconnect any arrestor String Power conditioner Arres...

Page 49: ...00 V or 1000 V 4 Press to release the lock 5 Connect the black test lead to the ground terminal 6 Connect the red test lead to terminal P of the string Note If a voltage is being generated between terminal P and ground there may be deteriorated insulation performance If the object to be measured has a voltage voltage detection make the display light in red and white alternately www com information...

Page 50: ... make continuous measurements pull out the key Note Do not disconnect the test leads until a resis tance is indicated If any of the lead is disconnected no accurate measurement is available 8 A resistance will be indicated after approximately four seconds updated every one second Note If there is any deteriorated insulation perfor mance resulting in a resistance lower than a refer ence do not make...

Page 51: ...nect the red test lead to the terminal N of the string to make measurements by procedures from 7 through 9 1 After insulation measurements for all the strings are completed disconnect the black test lead from the ground terminal 2 If arrestor has been disconnected reconnect it 3 Turn ON all disconnect switches used for strings 4 Return main switch of the connection box to ON After one minute is el...

Page 52: ...tomatically turn off once approximately 3 minutes pass since the last operation The auto backlight off function can be disabled as described below when working continuously in a dark location Disabling the auto backlight off function While the backlight is off press and hold for about 2 minutes until a continuous beep beep beep sound is heard Repeat this procedure after turning the instrument off ...

Page 53: ...matic DC AC detection PV measurement IR4053 only DC voltage supply current detection AC voltage measurement rectification method Mean rectification RMS value indication Available effective battery voltage indicator Battery power indicator Live circuit indicator Lights up when voltage is detected between LINE terminal and EARTH terminal Automatic electric discharge Automatically discharges the elec...

Page 54: ...tive with linear decrease up to 25 RH Model IR4053 0 C to 40 C 32 0 F to 104 0 F 90 RH or lower non condensing 40 C to 50 C 104 0 F to 122 0 F at 50 C and below relative with linear decrease up to 50 RH Operating environment Indoors Pollution Degree 2 Altitude up to 2000 m 6562 ft Nominal circuit voltage 600 V AC DC max Storage tempera ture and humidity Model IR4051 and IR4052 25 C to 65 C 13 0 F ...

Page 55: ...m Fuse Replacements FF0 5AH 1000V 70 172 40 0 500 SIBA Very fast acting arc extinction type high rupturing capacity type Dimensions excluding protru sions IR4051 IR4053 Approx 159W 177H 53D mm 6 26 W 6 97 D 2 09 D IR4052 Approx 152W 92H 40D mm 5 98 W 3 62 D 1 57 D Mass IR4051 IR4053 Approx 600g 21 2 oz IR4052 Approx 440g 15 5 oz including battery excluding test lead Accessories Refer to Verifying ...

Page 56: ...000 M 4000 M Effective medi um value 2 M 5 M 10 M 50 M 100 M 1st effective measuring range M 0 200 to 10 00 0 200 to 25 0 0 200 to 50 0 0 200 to 500 0 200 to 1000 Accuracy Limit deviation tolerance 4 rdg 2nd effective measuring range M 10 1 to 100 0 25 1 to 250 50 1 to 500 501 to 2000 1010 to 4000 Accuracy Limit deviation tolerance 8 rdg Other measur ing range M 0 to 0 199 Accuracy Limit deviation...

Page 57: ...display value 10 00 M 10 00 M 10 00 M 10 00 M 10 00 M Resolution 0 01 M 0 01 M 0 01 M 0 01 M 0 01 M Display range 100 M 100 M 100 M 100 M 100 M Maximum display value 100 0 M 100 0 M 100 0 M 100 0 M 100 0 M Resolution 0 1 M 0 1 M 0 1 M 0 1 M 0 1 M Display range 250 M 500 M 1000 M 1000 M Maximum display value 250 M 500 M 1000 M 1000 M Resolution 1 M 1 M 1 M 1 M Display range 2000 M 4000 M Maximum di...

Page 58: ...ss than 25 C to 0 C 50 C to 65 C Model IR4051 and IR4052 only 16 rdg less than 25 C to 0 C 50 C to 65 C Model IR4051 and IR4052 only 4 rdg 12dgt less than 25 C to 0 C 50 C to 65 C Model IR4051 and IR4052 only Effect of humidity 4 rdg and within allowance 8 rdg and within allowance 2 rdg 6dgt Effect of external magnetic field 2 4 rdg Effect of power sup ply E2 4 rdg and within allowance 8 rdg and w...

Page 59: ...g response Measurement terminal voltage characteristic Open circuit voltage 1 to 1 2 times of rated measurement voltage Lower limit resistance value to be maintained rated mea surement voltage 0 05 M 0 125 M 0 25 M 0 5 M 1 M Rated current 1 to 1 2 mA Short circuit current 1 2 mA or less Response time IR4052 Within 0 6 s with resistance load IR4051 IR4053 Within 1 0 s with resistance load Judgment ...

Page 60: ...temperature range other than 18 C to 28 C Effect of supply voltage 2 3 rdg 2dgt and within allowance Response time Within 1 s measurement terminal open o short Possible number of measurements 200 times or more Overload protection 600 V AC 10 s by Fuse Zeroadjustment range 0 to 3 Display update interval Within 1 s Display range Auto range Maximum display value Resolution Accuracy 2 after zero adjus...

Page 61: ... 1 2 s when input voltage is raised from 0 V to 600 V Input resistance 100 k or more 50 Hz 60 Hz Frequency range 50 Hz 60 Hz Range configuration Display range Auto range Maximum display value Resolution Accuracy 420 V Min display value 30 0 V 420 0 V 0 1 V 2 3 rdg 8dgt Accuracy of range over 600 V is not guaranteed 600 V 750 V 1 V Input resistance 100 k or more Range configuration Display range Au...

Page 62: ... for operational temperature range excluding 18 C to 28 C Effect of humidity Accuracy 1 0 and within allowance Effect of external magnetic field Accuracy 0 5 Effect of position E1 N A Effect of power supply E2 Accuracy 1 0 and within allowance Effect of superimposing DC voltage Within 10 Possible number of measurements 1000 times or more Overload protection 10 seconds at 660 V AC 10 seconds at 120...

Page 63: ... is divided by the 1 M resistor and a resistor connected between measuring terminals For example for an open voltage measurement using a DMM with its input imped ance at 10 M the output voltage is divided by the 1 M and 10 M Response time With in 4 0 s Starting measurement to display www com information itm com 1 800 561 8187 ...

Page 64: ...in transit Include cushioning material so the instrument cannot move within the package Be sure to include details of the problem Hioki cannot be responsible for damage that occurs during shipment Maintenance and Service Chapter 4 4 1 Troubleshooting Touching any of the high voltage points inside the instrument is very dangerous Do not attempt to modify disassemble or repair the instrument as fire...

Page 65: ...range The 500 V 1000 V and PV ranges use double action to prevent the inadvertent application of the measurement signal o Press after setting the rotary selector to the 500 V or 1000 V range Pressing while holding the RELEASE key will not disable the lock function In PV range select a voltage to be applied with 500 V mo 1000 V key and then press RELEASE key The MEASURE key on the test lead with a ...

Page 66: ...or error If the measured value fluctuates gradually wait for it to stabilize and then use that value There is excessive variation in the measured value With the IR4052 the measured value can be made easier to read by reducing the number of display digits The variation is caused by induced noise from a charging circuit located near the measurement target o Disconnect the circuit breaker for any nea...

Page 67: ...fications The test lead cable insulation resistance is too low o Use the test leads that came with the instrument or its optional test leads to perform the calibration procedure With standard wiring characteristics are affected when the resistance in the 1000 V range reaches or exceeds 100 M o Replace any test lead with its insulation performance deteriorated The output voltage polarity is reverse...

Page 68: ...hat the wiring resistance is 3 or less This error may occur if a fuse other than the specified type is used Use only the specified type of fuse The settings data has been corrupted Repair is required The pre adjustment data has been corrupted Repair is required The measurement circuit is broken Repair is required The voltage generation circuit is broken Repair is required There is a broken connect...

Page 69: ...ng the instrument Battery may explode if mistreated Do not short circuit recharge disassemble or dispose of in fire Handle and dispose of batteries in accordance with local regulations To prevent instrument damage or electric shock use only the screws for securing the battery cover in place that shipped with the product If you have lost any screw or find that any screws are damaged please contact ...

Page 70: ...ease do not use manganese nickel metal hydride or oxyride batteries The IR4053 does not require any fuse replacement Back of the instrument Screw Battery cover fuse batteries 1 Turn the rotary selector to OFF and remove the test lead from the instrument as a precaution 2 Loosen the central fastening screw at the back of the instrument and remove the battery cover 3 Replace all four batteries or th...

Page 71: ...e case Wipe the LCD gently with a soft dry cloth As dirt accumulated on the metal part of alligator clip has an effect on measurements keep the surfaces clean by gently wiping with a soft cloth 4 3 Replacing the Pin Option 1 Turn off the power of the instrument and disconnect the L9788 10 2 Rotate the tip pin with a spanner 7 mm width to remove it 3 Turn the new tip pin with a spanner and attach i...

Page 72: ...ted by applying a current I to the measurement target measuring the voltage V that occurs between the measurement terminals as a result and dividing the voltage V by the current I 3 PV measurement The measurement target s insulation resistance Rx is calculated by applying a voltage V to the target measuring the leak current I that flows to the target as a result and dividing the voltage V by the l...

Page 73: ...Uncertainty Intrinsic uncertainty Influence quantity Operation range Variation Insulation resistance Low resistance A Intrinsic uncertainty Reference condition 5 rdg 3 rdg 2dgt E2 Supply voltage 4 5 V to 6 8 V 4 rdg 3 rdg 2dgt E3 Temperature 0 C to 35 C 4 rdg 3 rdg 2dgt B Operation uncertainty 12 rdg 30 rdg Guaranteed range of operation uncertainty 1st effective measurement range 0 2 to 2 www com ...

Page 74: ...nt being generated influences the insula tion resistance meter resulting in inaccurate measurement with a normal insulation resistance meter PV measurement mode of the IR4053 allows accurate measurements without the effect from power generation 2㧚Measurement with P N shorted This measurement allows accurate measurements but is also a highly dangerous method as arc discharge may be generated due to...

Page 75: ...itions are considered to be outside the scope of warranty coverage even if the event in question occurs during the warranty period a Damage to objects under measurement or other secondary or tertiary damage caused by use of the product or its measurement results b Malfunctions caused by improper handling or use of the product in a manner that does not conform with the provisions of the Instruction...

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