Hioki DT4251 Page 47 Instruction Manual Download

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Inspection Before Use

Check that the electrical charge detection function operates
normally. (Only the DT4251)

Check method

Action

Position the detector on a known
power supply, such as a power outlet.

Normal:

A buzzer sounds and the red LED
lights up (energized).

Abnormal:

The display does not change. A
buzzer does not sound or the red
LED does not light up.

Solution:

A malfunction may have occurred.
Stop the inspection and do not use
the instrument.

To check the electric charge properly, do not use the instrument with test
leads wrapped around the instrument. The detection sensitivity of electric
charge measurement deteriorates.

Before measurements

WARNING

Observe the following to avoid short circuit accidents.

•

Always verify the appropriate setting of the rotary
switch before connecting the test leads.

•

Disconnect the test leads from the measurement
object before switching the rotary switch.

•

Operate or connect the instrument by following
the procedure of each measurement example (or
procedure steps).

Summary of Contents for DT4251

Page 1: ...Instruction Manual June 2014 Revised edition 1 DT4251A981 01 14 06H DT4253 DIGITAL MULTIMETER DT4252 DT4251 ...

Page 2: ......

Page 3: ...5 2 1 Measurement Workflow 25 2 2 Inserting Replacing Batteries 26 2 3 Using Test Leads 28 2 4 Installation in Measurement Location 31 Using the instrument with the stand 31 Attaching the strap 31 2 5 Using the Carrying Case 33 3 Performing Measurements 37 3 1 Inspection Before Use 37 3 2 Measuring Voltage 42 Measuring AC voltage 42 Measuring DC voltage 43 Measurement using the AC and DC automatic...

Page 4: ...Measuring with the auto range 57 Measuring with the manual range 57 4 2 Retaining the Measured Value 58 Retaining the measured value manually HOLD 58 Automatically retaining the measured value when the value stabilizes 58 4 3 Reducing the Noise FILTER 61 4 4 Checking the Maximum Minimum Average 63 4 5 Checking the Relative Value Performing Zero Adjustment 64 Checking the relative value REL 64 Perf...

Page 5: ... 2 Electrical Characteristics 75 5 3 Accuracy Table 77 6 Maintenance and Service 87 6 1 Repair Inspection and Cleaning 87 6 2 Troubleshooting 88 6 3 Error Display 91 6 4 Replacing Fuses 92 Appendix Appx 1 Appx 1 RMS and Average Appx 1 Ind Appx 7 6 5 4 3 2 1 ...

Page 6: ...iv ...

Page 7: ... during shipping In particular check the accessories panel switches and connectors If damage is evident or if it fails to operate according to the specifications contact your authorized Hioki distributor or reseller Check the package contents as follows DT4251 DT4252 or DT4253 DT4251 DT4252 DT4253 The holster has been attached L9207 10 Test Lead p 28 LR03 Alkaline battery 4 Instruction Manual Engl...

Page 8: ...600 V CATIII 1000 V 3 CATIII 1000 V 4 CATIII 600 V 5 CATIII 300 V CATII 600 V 7 CATIII 600V CATII 600V L4938 7 Test Pin Set L4939 4 Breaker Pin Set L4933 6 Contact Pin Set L4934 5 Small Alligator Clip Set L4935 2 Alligator Clip Set 9243 3 Grabber Clip L4936 4 Bus Bar Clip Set L4937 3 Magnetic Adapter Set L4932 1 Test Pin Set L9207 10 1 Test Lead L4930 2 Connection Cable Set Length 1 2 m L4931 2 Ex...

Page 9: ...bus bar Temperature measurement Only the DT4253 DT4910 Thermocouples K p 48 Temperature measuring junction Open flume type welding Sensor length Approx 800 mm Operating temperature 40 C to 260 C temperature measuring part 15 C to 55 C connector Allowable tolerance 2 5 C Carrying Case C0201 Carrying Case p 33 The instrument test leads instruction manual and others can be stored in the case C0202 Ca...

Page 10: ... strap to the instrument and secure it on the wall surface such as a metal plate for use DT4900 01 Communication Package USB p 68 A communication adapter USB cable PC software and communication specifications are included The instrument data can be stored on the PC ...

Page 11: ...as well as damage to the instrument Be certain that you understand the instructions and precautions in the manual before use WARNING 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 electricity measuring instruments are to use the instrument another person familiar with such instruments m...

Page 12: ...t or malfunction IMPORTANT Indicates information related to the operation of the instrument or maintenance tasks with which the operators must be fully familiar Indicates a high voltage hazard If a particular safety check is not performed or the instrument is mishandled this may give rise to a hazardous situation the operator may receive an electric shock may get burnt or may even be fatally injur...

Page 13: ...nal Indicates a double insulated device Indicates a fuse Indicates a grounding terminal Indicates DC Direct Current Indicates AC Alternating Current Indicates DC Direct Current or AC Alternating Current Symbols for various standards Indicates the Waste Electrical and Electronic Equipment Directive WEEE Directive in EU member states Indicates that the instrument conforms to safety regulations set o...

Page 14: ...rmocouple K is detected p 48 Accuracy We define measurement tolerances in terms of rdg reading and dgt digit values with the following meanings rdg Reading or displayed value The value currently being measured and indicated on the measuring instrument dgt Resolution The smallest displayable unit on a digital measuring instrument i e the input value that causes the digital display to show a 1 as th...

Page 15: ...onforms to the safety requirements for CAT III 1000 V CAT IV 600 V measuring instruments CAT II When directly measuring the electrical outlet receptacles of the primary electrical circuits in equipment connected to an AC electrical outlet by a power cord portable tools household appliances etc CAT III When measuring the primary electrical circuits of heavy equipment fixed installations connected d...

Page 16: ...normally to ensure that no damage occurred during storage or shipping If you find any damage contact your authorized Hioki distributor or reseller Installation Installing the instrument in inappropriate locations may cause a malfunction of instrument or may give rise to an accident Avoid the following locations For details on the operating temperature and humidity see the specifications p 73 CAUTI...

Page 17: ...CAUTION Avoid stepping on or pinching the cable which could damage the cable insulation To avoid damaging the cables do not bend or pull the leads and the probe bases The ends of the test leads are sharp Be careful to avoid injury For the test leads supplied with the instrument or the options to be connected to the instrument see the following information Accessories and options Reference Test lea...

Page 18: ...y the DT4252 Observe the following to avoid electric shock and or short circuits Hazardous voltage may be generated in a free measurement terminal Do not touch the free terminal Use only test leads and optional equipment specified by our company Do not allow the metal part of the test lead to touch any exposed metal or to short between 2 lines Never touch the metal end When connecting the clip typ...

Page 19: ...rse effects of the measurement current and the open circuit voltage Precautions during shipment Observe the following during shipment Hioki cannot be responsible for damage that occurs during shipment CAUTION During shipment of the instrument handle it carefully so that it is not damaged due to a vibration or shock To avoid damage to the instrument remove the accessories and optional equipment fro...

Page 20: ...14 Usage Notes ...

Page 21: ... The optional DT4900 01 Communication Package is required Large easily viewable display Backlighting to allow users to read the measurement values in dark environments Dual display Two types of measured values are displayed at the same time If there is an excessive input a hazard is indicated by the red LED Problem finding a suitable installation location The strap with magnet allows the instrumen...

Page 22: ... and Functions 1 2 Parts Names and Functions Front Some indications are different among the DT4251 DT4252 and DT4253 DT4253 Operation keys p 17 Measurement terminals p 20 Display p 22 DT4251 DT4252 Rotary switch p 18 ...

Page 23: ...um minimum and average values Cancels the display of the maximum minimum and average values lights up goes off 3 3 Switches cancels the low pass filter and passband settings Displays cancels the display of the relative value REL T Turns off the buzzer lights up goes off T lights up goes off 4 4 Sets the manual range switches the range and sets the clamp current range Cancels the manual range All L...

Page 24: ...53 DT4252 1 1 3 3 4 4 5 5 6 6 7 7 8 8 10 10 10 10 9 9 2 2 2 2 2 2 Function DT4251 DT4252 DT4253 1 1 2 2 AC voltage and frequency measurement DC voltage measurement 1 DC voltage measurement High accuracy 600 0 mV range DC AC voltage measurement Automatic judgment Input impedance 900kΩ 20 ...

Page 25: ...k 4 4 Resistance measurement 5 5 Electrostatic capacity 6 6 Diode test 7 7 AC measurement Clamp sensor used 8 8 Electrical charge measurement 9 9 Temperature measurement 10 10 DC μA measurement DC mA measurement DC A measurement AC A and frequency measurement 1 No 600 0 mV range ...

Page 26: ...eafter referred to as COM terminal The black test lead is connected 3 3 Used for voltage measurement resistance measurement continuity check diode test temperature measurement electrostatic capacity measurement or clamp current measurement Hereafter referred to as V terminal The red test lead is connected Be sure to carefully read the following precautions for the terminals with the marking Precau...

Page 27: ...smitted to the PC p 68 Stand The instrument can be set on the stand p 31 Test lead holder The test lead can be held Battery cover When replacing the batteries p 26 or fuse p 92 remove the cover See p 26 Strap hole The optional Z5004 Magnetic Strap can be attached p 31 Serial number label It is necessary for production control such as product warranty Do not peel off the label ...

Page 28: ...p 61 4 4 AC DC 1 DT4251 2 DT4252 3 DT4253 5 5 AC DC automatic judgment 1 3 Relative value display measurement other than temperature p 64 Relative value display during temperature measurement temperature difference from the standard p 65 3 6 6 Battery indicator p 23 The auto power save function is activated p 67 7 7 Each unit T1 T2 Lights up when the relative value of the temperature is displayed ...

Page 29: ...measurement object When the thermocouple is broken Temperature measurement Thermocouple K Corrective action Check that the thermocouple has been connected correctly to the measurement terminal If the display does not change Thermocouple K is broken Replace with a new Thermocouple K Battery warning indicator Fully charged As the battery charge diminishes black charge bars disappear one by one from ...

Page 30: ...24 Alarm Display and Battery Indicator Power shutdown When the charge is 0 less than 4 0 V 0 1 V bAtt appears in the display for 3 seconds and the power is shut down ...

Page 31: ...tion 2 2 3 3 Red Black 1 1 1 The position of the rotary switch varies depending on the model To ensure safe operation make sure to select a measurement function and then connect the test leads to the measurement object Attach the test leads to the measurement terminals p 28 As necessary perform zero adjustment p 66 Connect the test leads to the measurement object As necessary Hold the display of t...

Page 32: ...m the object to be measured before replacing the batteries To avoid the possibility of explosion do not short circuit charge disassemble or incinerate batteries After battery replacement but before using the instrument reattach and screw down the battery cover CAUTION Poor performance or damage from battery leakage could result Observe the cautions listed below Do no mix new and old batteries or d...

Page 33: ...Phillips screwdriver Alkaline LR03 battery 4 2 Remove the test leads from the instrument 3 Set the rotary switch to OFF 4 Using a Phillips screwdriver remove the screw 1 location from the battery cover on the rear of the instrument 5 Remove the battery cover 6 Remove all of the old batteries 7 Insert 4 new batteries LR03 being careful to the battery polarity 8 Reattach the battery cover 9 Secure t...

Page 34: ... be sure to use the test leads with the sleeves attached when performing measurements in the CAT III and CAT IV measurement categories See Measurement categories p 9 If the sleeves are inadvertently removed during measurement stop the measurement CAUTION To ensure safe operation use only test leads specified by our company When carrying out measurements with the sleeves in place be careful to avoi...

Page 35: ... sleeve removed Diameter approx 2 mm Sleeve Attach to the metal pins to prevent short circuit accidents Barrier Represents the safe handling distance from the metal pins During measurement do not touch the area between the barrier and the tip of the sleeve Plug Connect to the measurement terminals on this instrument Cable Double sheathed cables Length approx 900 mm Diameter approx 3 6 mm When the ...

Page 36: ... holes of the sleeves and firmly push them all the way in Connecting to the instrument 1 1 2 2 1 Turn the rotary switch to the desired measurement function 2 Connect the test leads to the relevant measurement terminals Except the current measurement except clamp COM terminal Connect the black test lead V terminal Connect the red test lead Current measurement COM terminal Connect the black test lea...

Page 37: ...sition the instrument on an unstable table or inclined surface When the instrument is set on the stand do not apply a strong force above Doing so may damage the stand Attaching the strap Attach the optional Z5004 Magnetic Strap to the instrument and attach the magnet to the wall surface with metal plate affixed Magnet Attach it to the wall surface with metal plate affixed Strap holes ...

Page 38: ...cations where it may be exposed to rainwater dust or condensation In those conditions the Z5004 may be decomposed or deteriorated The magnet adhesion may be diminished In such case the instrument may not be hung in place and may fall Do not bring the Z5004 near magnetic media such as floppy disks magnetic cards pre paid cards or magnetized tickets Doing so may corrupt and may render them unusable ...

Page 39: ...33 Using the Carrying Case 2 5 Using the Carrying Case C0201 Carrying Case The test leads can be stored The instruction manual can be stored at the bottom of the case The instrument can be stored ...

Page 40: ...34 Using the Carrying Case Removing the cover 1 Unfasten the button on the side of the cover marked with OPEN 2 Flip the cover to the back 3 Fasten the button ...

Page 41: ...35 Using the Carrying Case Using the instrument with a strap around the neck 1 1 1 Unfasten the button 2 2 Secure the button at the position shown in the figure ...

Page 42: ...36 Using the Carrying Case ...

Page 43: ... use the instrument but send it for repair The terminals are not contaminated with debris Remove contamination with a cotton swab The coating of the test leads is neither broken nor frayed or the white portion or metal part within the lead is exposed If the test lead is damaged there is a risk of electric shock Do not use the instrument but send it for repair Check when turning on the power Set th...

Page 44: ... its specifications 1 Check that the test leads are not broken Check method Action Regarding the continuity check deliberately short circuit the test leads and then check the display Red Black Normal A buzzer sounds and the value stabilizes at around 0Ω Abnormal A buzzer does not sound and a numeric value other than the above appears Corrective action The test leads may be broken Replace with thos...

Page 45: ...e Perform the AC voltage measurement to measure the commercial power supply and then check the display Red Black For the DT4252 The position of the rotary switch varies depending on the model Normal An already known value appears In this example the commercial voltage level should appear Abnormal The measured value does not appear The malfunction may occur Stop the inspection and do not use the in...

Page 46: ...1 A Approx 0 1Ω Abnormal If the value above is not obtained the value higher than that is displayed replace the fuse DT4253 check method Action 1 Remove the fuse from the instrument p 92 2 Reattach the battery cover 3 In the resistance measurement check the resistance of the fuse Resistance measurement p 47 Normal Fuse rating Resistance 250 mA 2 to 7Ω Abnormal If the value above is not obtained th...

Page 47: ...op the inspection and do not use the instrument To check the electric charge properly do not use the instrument with test leads wrapped around the instrument The detection sensitivity of electric charge measurement deteriorates Before measurements WARNING Observe the following to avoid short circuit accidents Always verify the appropriate setting of the rotary switch before connecting the test lea...

Page 48: ...ndicated on the instrument or probes is exceeded the instrument may be damaged resulting in personal injury Do not use the instrument in such locations See Measurement categories p 9 The autoranging function of this instrument automatically selects the optimum measurement range To change the range arbitrarily use the manual range p 57 Measuring AC voltage Measure the AC voltage Measure the frequen...

Page 49: ...position of the rotary switch varies depending on the model Measurement using the AC and DC automatic judgment DT4251 DT4253 The AC and DC are automatically judged and the voltage is measured The instrument does not measure both AC and DC at the same time AC voltage DC voltage 2 2 3 3 Red Black 1 1 2 2 3 3 Red Black 1 1 ...

Page 50: ... be displayed even with no input This does not indicate a malfunction of the instrument The sensitivity of the frequency measurement is regulated by range Minimum sensitivity voltage Minimum sensitivity current p 79 When the value is less than the minimum sensitivity voltage current the indicated value may fluctuate When the voltage current range is lowered the value stabilizes This does not apply...

Page 51: ...be sure to turn off the power to the measurement circuit Otherwise electric shock may occur or the instrument may be damaged 2 2 3 3 Red Black 1 1 Detection Threshold Buzzer Red LED Short circuit detection 25Ω 10Ω Sounds continuous buzzer sound Turns on Open detection 245Ω 10Ω Does not sound Turns off A buzzer sounds before the red LED lights up ...

Page 52: ...sound and red LED WARNING Before measuring be sure to turn off the power to the measurement circuit Otherwise electric shock may occur or the instrument may be damaged Cathode Anode 3 3 Red Black 1 2 2 1 1 In the case of the opposite connection The open terminal voltage is approx 5 0 V or less To avoid damage to the measurement object check the specifications of the measurement object before use ...

Page 53: ...e using the relative value display relative function in advance WARNING Before measuring be sure to turn off the power to the measurement circuit Otherwise electric shock may occur or the instrument may be damaged 2 2 3 3 Red Black 1 1 The open terminal voltage is approx 1 8 V or less The measurement current DC varies depending on the range To avoid damage to the measurement object check the speci...

Page 54: ...t do not input any voltage or supply current to the thermocouple 1 1 2 3 3 2 2 DT4910 Red Black Be careful to observe the polarity when connecting the thermocouple When a breaking state of the Thermocouples K is detected Checking the temperature change It can be checked in the relative value display p 65 Changing the temperature units Celsius and Fahrenheit can be switched p 72 ...

Page 55: ...PEn is displayed The instrument or thermocouple may be malfunctioning Check this with the following procedure 1 Short circuit the V and COM terminals of the instrument using the test leads The ambient temperature is displayed To step 2 The ambient temperature is not displayed The instrument is malfunctioning Send it for repair 2 Connect the thermocouple in the correct direction OPEn remains displa...

Page 56: ...erwise electric shock may occur or the instrument may be damaged Do not measure the capacitor which has been charged 2 2 3 3 Red Black 1 1 When measuring the polar capacitor Connect the V terminal red test lead to the terminal of the capacitor and the COM terminal black test lead to the terminal For components on a circuit board measurement may not be possible due to the effect of the peripheral c...

Page 57: ...id electrical accidents turn off the power to the circuit before measuring and then connect the test leads Measuring DC AC Function μA Selected to measure 600 0 μA DC or less DT4253 mA Selected to measure 60 00 mA DC or less DT4253 The conversion of 4 20 mA can be checked in the sub display A Selected to measure 10 A DC AC or less DT4252 When measuring an unknown current Set to the high range mA f...

Page 58: ...Example Measuring the current of the burner flame μA Control board The measured current value of the burner flame varies with the input impedance of the instrument The μA input impedance of this instrument is approx 1kΩ DT4252 Red Black 3 3 1 1 2 2 Load Power supply ...

Page 59: ...n DT4253 The 4 20 mA signal of the instrumentation system can be converted to 0 to 100 and checked 4 mA 20 mA 0 100 An input less than 4 mA or exceeding 20 mA is displayed with Red Black Sensor Two wire transmitter Distributor Output signal 4 20 mA 24 V ...

Page 60: ...ired Before using the clamp on probe be sure to read the Instruction Manual which accompanies the optional clamp 4 4 1 1 3 5 5 Set the clamp on probe and the instrument to the same range 9704 Conversion Adapter Clamp on probe 9704 Conversion Adapter Clamp on probe Change the range in accordance with the actual measurement If the range of the clamp on probe is changed during measurement change the ...

Page 61: ...ng a cable Attach the clamp around only one conductor Single phase 2 wire or three phase 3 wire cables clamped together will not produce any reading OK When the measured value and OVER blink The measured value exceeds the maximum display counts Increase the range ...

Page 62: ... the instrument with test leads fixed to the lead holders To check the electric charge properly do not use the instrument with test leads wrapped around the instrument The detection sensitivity of electric charge measurement deteriorates Check that the detection function operates normally before use p 41 1 1 2 2 1 Select the measurement function 2 Move the power line close to the instrument When t...

Page 63: ...relative value REL function is enabled the range cannot be changed Measuring with the auto range RANGE AUTO lights up When the measurement function is switched using the rotary switch the auto range is enabled Measuring with the manual range Press RANGE MANUAL lights up Each time is pressed a higher range is specified When the key is pressed at the highest range the lowest range is specified once ...

Page 64: ...n HOLD goes off Automatically retaining the measured value when the value stabilizes Press for at least 1 second HOLD blinks When the measured value stabilizes a beeping sound is generated and the value is retained HOLD lights up If HOLD is pressed again for at least 1 second or the input signal exceeds the Threshold for auto holding p 59 or when the range is switched internally the hold state is ...

Page 65: ...range 20 or less 1000 V range AUTO V 120 or less 120 or less Continuity check 100 or less 4900 or more Resistance 100 or less 4900 or more Diode 40 or less 1460 or more AC Clamp 50 100 25 50 100 25 50 or less Each range 50 100 25 50 100 25 50 or less Each range DC μA 120 or less 120 or less DC mA 120 or less 120 or less DC A 120 or less except 10 A range 20 or less 10 A range 120 or less except 10...

Page 66: ...ld Example 100 0 V Not retained automatically The threshold is not exceeded Auto hold Example 99 0 V Measured value Connect to the measurement object Release Release Release Connect Connect Stable range Dead zone Conceptual diagram AC voltage Threshold for auto holding ...

Page 67: ...an be used when measuring the AC voltage AC and DC voltage automatic judgment AC current and clamp AC current The passband setting for the low pass filter can be selected Example 1 FILTER OFF Example 2 FILTER 100 Hz Press Current FILTER setting is displayed Each time is pressed while the current FILTER setting is displayed the passband setting is changed OFF 100 Hz 500 Hz OFF When the desired pass...

Page 68: ...rty when a filter is used Measured value V Filter OFF Passband 500 Hz Passband 100 Hz AC voltage 600 0 V range 100 V input Frequency at 100 V input Hz Example Power frequency on an aircraft or marine vessel is 400 Hz When voltage is 100 V FILTER setting Displayed value Normal OFF Approx 100 V 500 Hz Abnormal 100 Hz Around 0 V ...

Page 69: ...s Each time the key is pressed the main display is changed MAX MIN AVG MAX The current measured value can be checked in the sub display Changing back to the normal display Press for at least 1 second The maximum MAX and minimum MIN values are for the displayed value they do not relate to peak values such as AC signals When the key is pressed and the instrument enters the measurement mode for maxim...

Page 70: ...e influences of the test lead wiring resistance continuity resistance measurement and the wiring capacity capacitor measurement When the following measurement function is selected this function is disabled AUTO V Diode Electric charge measurement Checking the relative value REL Example 1 DC voltage measurement When the standard value is measured press for at least 1 second lights up The relative v...

Page 71: ... light up When the standard value is measured press for at least 1 second The standard temperature is fixed as T1 The currently measured temperature is displayed as T2 alternately with T1 The temperature difference T T2 T1 is displayed in the sub display T goes off To cancel the state press for at least 1 second again ...

Page 72: ... 2 3 3 4 Red Black 4 4 Example 1 Resistance measurement 1 Select the measurement function 2 Connect the test leads to the measurement terminals 3 Allow the test leads to short circuit 4 Press for at least 1 second After zero adjustment 0 0Ω 5 Measure the resistance 3 3 Red 2 2 Black 1 1 4 4 Example 2 Capacitor measurement 1 Select the measurement function 2 Connect the test leads to the measuremen...

Page 73: ... In the default setting the auto power save function is set to enabled lights up It is also possible to disable the auto power save function At 30 seconds before the instrument enters the sleep mode the APS blinks to indicate its status To continuously use the instrument press any key or turn the rotary switch Auto power save function When the instrument is in the sleep mode press any key or turn ...

Page 74: ...ual which accompanies with the communication package Attaching the USB cable to the instrument p 69 Connect to the PC The virtual COM ports of the PC can be used as the USB interface The instrument recognizes the COM1 to COM256 virtual ports Communication method Start stop system half duplex transmission Baud rate 9 600 bps fixed Parity None Data bit length 8 bits Delimiter CR LF Stop bit 1 bit Co...

Page 75: ...o orient each cable correctly During communication appears in the display When is lit the operation keys of the instrument is disabled During communication do not disconnect the USB cable Disconnecting the cable stops the communication In that case a warning is displayed by the PC software Connect the cable again It is possible to use the instrument while the communication adapter is attached howe...

Page 76: ...erature display unit changes are lost When the operation key is released after changing the setting the regular display then reappears Turn on the power while pressing the operation key Turn the rotary switch from OFF Setting change Method Canceling the auto power save function APS APS goes off See p 67 Buzzer OFF Disabling the automatic backlight deactivation ...

Page 77: ...indicators Third position from OFF Check that there are no missing indicators If any indicator is missing stop using the instrument and send it for repair Checking the adjustment source Second position from OFF FACT Indicates that the settings have been adjusted by Hioki USER Indicates that the settings have been adjusted by the user ...

Page 78: ...n the power while pressing and simultaneously 2 Press and hold and simultaneously 3 Press to change the temperature unit 4 Press and hold to save the setting 5 After turning the power OFF turn the rotary switch to TEMP and check the temperature unit The setting of the temperature unit is retained even after the power is turned off ...

Page 79: ... switch Mass Approx 390 g 13 8 oz including the batteries and holster Operating environment Indoors pollution degree 2 altitude up to 2 000 m 6 562 ft Operating temperature and humidity Temperature 10 C to 50 C 14 F to 122 F Humidity 10 C to 40 C 14 F to 104 F 80 RH or less non condensating 40 C to 45 C 104 F to 113 F 60 RH or less non condensating 45 C to 50 C 113 F to 122 F 50 RH or less non con...

Page 80: ...ster attached to the instrument with a test lead holder Instruction Manual LR03 alkaline battery 4 not installed in the instrument Options See Options sold separately p 2 Replacement parts DT4253 250 mA 1000 V fuse for current terminal μA mA Breaking capacity 50 kA AC 30 kA DC Fast blow type 10 3 38 mm HOLLYLAND DT4252 11 A 1000 V fuse for current terminal A Breaking capacity 50 kA AC 30 kA DC Fas...

Page 81: ...0 6 to 0 7 seconds 0 V 100 V auto range operation 4 Ω Approx 1 0 to 1 1 seconds Infinity 0Ω auto range operation 4 Display update rate Measured value 5 times s excluding electrostatic capacity frequency temperature after the range is fixed 5 0 05 to 5 times s varies depending on the electrostatic capacity 5 1 to 2 times s frequency 5 1 time s temperature 5 Bar graph Updated 40 times s Dielectric s...

Page 82: ...mVa Power voltage 6 0 V continuity measurement input short circuited backlight lit Rated power 36 mVA 20 or less Power voltage 6 0 V DCV measurement backlight off 6 mVA 20 or less Power voltage 6 0 V auto power save function activated Continuous operating time LR03 alkaline batteries backlight off Approx 130 hours 1 DT4251 2 DT4252 3 DT4253 4 Until the values stabilize within the accuracy specific...

Page 83: ... Cable Set coupled 2 cables 3 m see the accuracy table rdg reading or displayed value The value currently being measured and displayed on the measuring instrument dgt resolution The smallest displayable unit i e the input value that causes the digital display to show a 1 1 AC voltage Range Accuracy 1 Input impedance 40 to 500 Hz Over 500 Hz to 1 kHz 6 000 V 0 9 rdg 3 dgt 1 8 rdg 3 dgt 11 2MΩ 2 0 1...

Page 84: ...e range for frequency are also displayed The accuracy is not specified for strain waveforms outside the range of 40 Hz to 1 kHz For 100 Hz with the filter ON 1 5 rdg is added to the accuracy specification between 40 Hz and 100 Hz and the accuracy is not specified in 100 Hz or more For 500 Hz with the filter ON 0 5 rdg is added to the accuracy specification between 40 Hz and 500 Hz and the accuracy...

Page 85: ...800 V or more 12 00 V or more 120 0 V or more 230 V or more Over 50 00 kHz to 99 99 kHz 3 000 V or more 24 00 V or more 240 0 V or more 400 V or more The voltage input is up to 2 107 V Hz appears when no measurement can be made 1 The measurement range from 5 00 Hz is only for the 6 000 V range The measurement range for other voltage ranges is 40 00 Hz to 99 99 Hz 3 DC voltage Range Accuracy Input ...

Page 86: ...2 at 6000 counts Connection method DC coupling 1 For AC voltage the accuracy is specified in 1 or more of the range however 5 dgt should be added to 5 or less of the range Accuracy guarantee range for frequency 40 Hz to 1 kHz Measured values outside the accuracy guarantee range for frequency are also displayed The accuracy is not specified for strain waveforms outside the range of 40 Hz to 1 kHz F...

Page 87: ...uracy Measurement current Open circuit voltage 600 0Ω 0 7 rdg 5 dgt 200 μA 20 1 8 V DC or less 6 000kΩ 0 7 rdg 5 dgt 100 μA 20 1 8 V DC or less 60 00kΩ 0 7 rdg 5 dgt 10 μA 20 1 8 V DC or less 600 0kΩ 0 7 rdg 5 dgt 1 μA 20 1 8 V DC or less 6 000MΩ 0 9 rdg 5 dgt 100 nA 20 1 8 V DC or less 60 00MΩ 1 5 rdg 5 dgt 10 nA 20 1 8 V DC or less Overload protection 1000 V DC 1000 V AC or 2 107 V Hz energized ...

Page 88: ...state 0 8 A or less Maximum count for each range 1100 1000 for 10 00 mF Auto range movement threshold 1100 counts or more for upper range 100 counts or less for lower range 9 Diode Range Accuracy Measurement current Open circuit voltage 1 500 V 0 5 rdg 5 dgt 0 5 mA 20 5 0 V DC or less Voltage drop due to battery consumption Overload protection 1000 V DC 1000 V AC or 2 107 V Hz energized for 1 minu...

Page 89: ...uracy is specified Standard contact temperature compensation stability time 120 minutes When the instrument environmental temperature changes quickly from 50 C to 23 C 2 The F display is activated using a special instrument operation 11 AC clamp sensor Range Accuracy only the instrument 1 Conversion rate 40 Hz to 1 kHz 10 00 A 0 9 rdg 3 dgt 0 05 A mV 20 00 A 0 9 rdg 3 dgt 0 10 A mV 50 0 A 0 9 rdg ...

Page 90: ...re For 500 Hz with the filter ON 0 5 rdg is added to the accuracy specification between 40 Hz and 500 Hz and the accuracy is not specified in 500 Hz or more 12 DC μA Range Accuracy Input impedance 60 00 μA 0 8 rdg 5 dgt 1kΩ 5 600 0 μA 0 8 rdg 5 dgt 1kΩ 5 Overload protection 250 mA 1000 V fuse breaking capacity 50 kA AC 30 kA DC Auto range movement threshold 6 000 counts or more for upper range 540...

Page 91: ... 6000 counts 3 or less 10 00 A range Connection method DC coupling Auto range movement threshold 6 000 counts or more for upper range 540 counts or less for lower range 1 The accuracy is specified in 1 or more of the range however 5 dgt should be added to 300 counts or less Accuracy guarantee range for frequency 40 Hz to 1 kHz Measured values outside the accuracy guarantee range for frequency are ...

Page 92: ...harge Detection voltage range 1 Detection target frequency 80 V AC to 600 V AC 50 60 Hz During voltage detection a continuous buzzer sounds and the red LED lights up 1 In contact with the insulated wire that is equivalent to IV2 mm2 ...

Page 93: ...requency varies depending on the status of the instrument or installation environment We recommend that the calibration frequency is determined in accordance with the status of the instrument or installation environment and that you request that calibration be performed periodically Cleaning To clean the instrument wipe it gently with a soft cloth moistened with water or mild detergent Wipe the di...

Page 94: ... it carefully to prevent damage during transportation 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 transportation Before sending the instrument for repair Symptom Check and or remedy Nothing appears in the display Or the display disappears after a short time Check tha...

Page 95: ...form the continuity check to confirm the continuity of the test leads p 38 If the test lead is broken replace the lead Check that the test leads have been inserted at the ends Check that the measurement method is correct If no problems have been found the instrument may be malfunctioning Send the instrument for repair The display does not stabilize and the value fluctuates it is difficult to read ...

Page 96: ...multiple instruments with 1 PC To communicate with the instrument the optional DT4900 01 Communication Package is required It is possible to control multiple instruments via USB ports The instrument cannot communicate with the PC Is the communication setting between the instrument and the PC correct Are the baud rate and parity check set correctly p 68 Is the USB cable connected correctly p 68 Are...

Page 97: ...ion Err 001 ROM error Program When the error appears in the display it is necessary to repair the instrument Contact your authorized Hioki distributor or reseller Err 002 ROM error Adjustment data Err 004 EEPROM error Memory data Err 005 ADC error Hardware malfunction ...

Page 98: ...rrent or do not short circuit and use the fuse holder Doing so may damage the instrument and result in personal injury Specified fuses Rating Specifications For μA mA terminal DT4253 250 mA 1000 V Manufacturer HOLLYLAND Breaking characteristic Fast blow type Breaking capacity 50 kA AC 30 kA DC Size 10 3 mm 38 mm For A terminal DT4252 11 A 1000 V The fuses can be purchased via authorized Hioki dist...

Page 99: ...est lead L9207 10 supplied with the instrument The tip of the test lead may bend 1 Remove the test leads from the instrument 2 Set the rotary switch to OFF Screw Rear Sc c c c c c c 3 Using a Phillips screwdriver remove the screw 1 location from the battery cover 4 Remove the battery cover 5 Replace the fuse 6 Reattach the battery cover 7 Secure the cover with the screw ...

Page 100: ...94 Replacing Fuses ...

Page 101: ...S method is applied to this instrument In the true RMS method the high frequency component is also included and displayed In the average method the input waveform is handled as a sine wave where no skew is included only single frequency The average of the AC signal is obtained converted to the RMS and then displayed If the waveform is skewed a greater measurement error occurs Measurement example T...

Page 102: ...Appx 2 RMS and Average ...

Page 103: ...13 09 ...

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Summary of Contents for DT4251

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Hioki DT4251, Instruction Manual

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Summary of Contents for DT4251

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