Twilight DT4200, Instruction Manual

Page 1: ...EN DT4222 DIGITAL MULTIMETER DT4221 Instruction Manual Aug 2016 Revised edition 2 DT4221A981 02 16 08H DT4223 DT4224 ...

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Page 3: ... Battery Indicator 20 2 Preparation for Measurements 21 2 1 Measurement Workflow 21 2 2 Inserting Replacing the Battery 22 2 3 Using Test Leads 24 2 4 Installation in Measurement Location 27 Hanging the instrument with the strap 27 3 Performing Measurements 29 3 1 Inspection Before Use 29 3 2 Measuring Voltage 33 Measuring AC voltage 33 Measuring DC voltage 34 Measurement using the AC DC automatic...

Page 4: ...l range 42 4 2 Retaining the Measured Value 43 Retaining the measured value manually HOLD 43 Automatically retaining the measured value when the value stablizes AUTO HOLD DT4223 DT4224 44 4 3 Reducing the Noise FILTER 46 4 4 Checking the Relative Value Performing Zero Adjustment 48 Checking the relative value REL 48 Performing zero adjustment 49 4 5 Turning On the Backlight 51 4 6 Using the Auto P...

Page 5: ...iii Contents 6 Maintenance and Service 65 6 1 Repair Inspection and Cleaning 65 6 2 Troubleshooting 66 6 3 Error Display 68 Appendix Appx 1 Appx 1 RMS and Average Appx 1 ...

Page 6: ...iv Contents ...

Page 7: ...t no damage occurred 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 Instrument The holster has been attached DT4221 DT4222 DT4224 DT4223 DT4911 Test Lead p 24 LR03 Alkaline battery Instruction M...

Page 8: ...ng Connecting cables p 24 L4933 Contact Pin Set L4934 Small Alligator Clip Set DT4911 Test Lead 33 V AC 70 V DC CAT III 300 V CAT II 600 V C0200 Carrying Case The instrument test leads instruction manual and others can be stored in the case Z5004 Z5020 Magnetic Strap p 27 Attach this strap to the instrument and secure it on the wall surface such as a metal plate for use ...

Page 9: ...y or death 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 in...

Page 10: ...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 11: ...tes 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 regulations set out by the EC Directive Screen display This instrument uses the followi...

Page 12: ...h 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 the least significant digit ...

Page 13: ...instrument conforms to the safety requirements for CAT III 600 V CAT IV 300 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 ...

Page 14: ... the first time verify that it operates 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 CAUTION Exposed to direct sunlight or high temp...

Page 15: ...asurement category and rated voltage To avoid electric shock do not exceed the lower of the ratings shown on the instrument and test leads 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 Precautions during measurement...

Page 16: ...e 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 from ...

Page 17: ...on function to ensure safe measurement DT4223 DT4224 Protective circuitry to ensure safety in the event of voltage measurement using the continuity resistance capacitance or diode range Voltage Input Protected Red backlight to warn user of erroneous voltage input Protective circuitry operates in the event of erroneous voltage input to limit the amount of current flowing to the instrument to 1 5 mA...

Page 18: ...ting to allow users to read the measurement values in dark environments Problem finding a suitable installation location The strap with magnet allows the instrument to be hung conveniently For various purposes The measurement test leads and end pins can be selected ...

Page 19: ...13 Parts Names and Functions 1 2 Parts Names and Functions Front Some indications are different among the models DT4221 DT4222 DT4223 DT4224 Display p 18 Operation keys p 14 Rotary switch p 16 ...

Page 20: ...ght up and the software version is displayed RANGE AUTO RANGE MANUAL 2 2 Manually sets cancels the hold function for the displayed value Sets cancels the display of the relative value REL Cancels the auto power save function APS lights up goes off lights up goes off APS goes off 3 3 Turns on off the backlight Switches cancels the low pass filter and passband settings Turns off the automatic backli...

Page 21: ...s light up The software version and serial number is displayed RANGE AUTO RANGE MANUAL 2 2 Manually sets cancels the hold function for the displayed value Automatically sets cancels the hold function for the displayed value Cancels the auto power save function APS lights up blinks APS goes off 3 3 Turns on off the backlight Switches cancels the low pass filter and passband settings Turns off the a...

Page 22: ...2 5 5 2 2 3 3 5 5 7 7 6 6 DT4223 1 1 4 4 2 2 3 3 Function DT4221 DT4222 DT4224 DT4223 1 1 2 2 AC voltage measurement DC voltage measurement 3 3 Frequency measurement 4 4 DC AC voltage measurement Automatic judgment 5 5 Continuity check 6 6 Electric charge detection 7 7 Resistance measurement 8 8 Capacitance measurement 9 9 Diode test ...

Page 23: ...hed p 27 Battery cover When replacing the battery p 22 remove the cover See p 22 Serial number label It is necessary for production control such as product warranty Do not peel off the label Measurement terminals See p 26 1 1 The red test lead is connected Hereafter referred to as V terminal 2 2 The black test lead is connected Hereafter referred to as COM terminal ...

Page 24: ...C 3 3 Continuity check p 36 4 4 Diode p 37 5 5 Retention of the measured value p 43 6 6 Relative value display p 48 7 7 The filter function is activated p 46 8 8 The auto power save function is activated p 51 9 9 Battery indicator p 19 10 10 Indication example In the case of 30 V input in the 60 V range the bar is displayed to the center of the scale 11 11 Auto range manual range p 41 1 DT4221 2 D...

Page 25: ...t flashes to warn the user Immediately move the test leads away from the measurement object Grounding terminal Voltage input Protective circuitry operates in the event of erroneous voltage input to limit the amount of current flowing to the instrument to 1 5 mA or less This safe design keeps circuit breakers from tripping and sparks from being produced at the tips of test leads ...

Page 26: ...ent object Measurement other than voltage The measured value and OVER blinks Battery warning indicator Fully charged As the battery charge diminishes black charge bars disappear one by one from the left of the battery indicator The battery voltage is low Replace the battery as soon as possible Blinks The battery is exhausted Replace the battery The charge is only a reference for the continuous ope...

Page 27: ...fe operation make sure to select a measurement function and then connect the test leads to the measurement object To ensure safe operation make sure to select a measurement function and then connect the test leads to the measurement object 2 2 1 1 Attach the test leads to the measurement terminals p 24 As necessary perform zero adjustment p 49 Connect the test leads to the measurement object As ne...

Page 28: ...the test leads away from the measurement object before replacing the battery 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 not use old bat...

Page 29: ...l regulations Screw Rear 1 Have the following items available and ready Phillips screwdriver Alkaline LR03 battery 1 2 Move the tips of the test leads away from the measurement object 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 the old battery 7 Insert one new batt...

Page 30: ...use our optional parts For details on the optional items see Options sold separately p 2 WARNING To prevent a short circuit accident 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 7 If the sleeves are inadvertently removed during measurement stop the measurement CAUTION To ensure saf...

Page 31: ...e 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 540 mm When the white portion inside the cable is exposed replace with a new DT4911 Test Lead Removing and attaching the sleeves Removing the sleeves Attaching the sleeves Gently hold the bottom of the sleeves and pull the sleeves off Safely s...

Page 32: ...ld the end of the plugs Do not pull the cables with excessive force as they may be broken Black Red When connecting the test leads to the instrument push them as far as possible into the measurement terminals while holding the end of the plugs COM terminal Connect the black test lead V terminal Connect the red test lead ...

Page 33: ...te properly and the life of the operator may be put at great risk CAUTION Do not use the Z5004 Z5020 in locations where it may be exposed to rainwater dust or condensation In those conditions the Z5004 Z5020 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 Z5020 near magnetic media such ...

Page 34: ...28 Installation in Measurement Location Strap holes Magnet Attach it to the wall surface with metal plate affixed Front Rear Example Z5004 ...

Page 35: ...t 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 t...

Page 36: ...st leads are not broken Check method Action Regarding the continuity check deliberately short circuit the test leads and then check the display For the DT4221 The position of the rotary switch varies depending on the model Normal A buzzer sounds and the value stabilizes at around 0 Ω Abnormal A buzzer does not sound and a numeric value other than the above appears Corrective action The test leads ...

Page 37: ...e values appear Check method Action Example Perform the AC voltage measurement to measure the commercial power supply and then check the display Normal An already known value appears In this example the commercial voltage level should appear Abnormal The measured value does not appear A malfunction may have occurred Stop the inspection and do not use the instrument ...

Page 38: ...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 detection 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 t...

Page 39: ...ing indicated 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 7 The auto ranging function of this instrument automatically selects the optimum measurement range To change the range arbitrarily use the manual range p 42 Measuring AC voltage Measure the AC voltage The measured ...

Page 40: ... the DC voltage 2 2 1 1 Measurement using the AC DC automatic judgment DT4221 DT4223 The AC or DC are automatically judged and the voltage is measured The instrument does not measure both AC and DC at the same time 1 2 2 DC voltage AC voltage 2 2 1 1 ...

Page 41: ...nput This does not indicate a malfunction of the instrument The sensitivity of the frequency measurement is regulated by range Minimum sensitivity voltage p 60 When the value is less than the minimum sensitivity voltage the indicated value may fluctuate When the voltage range is lowered the value stabilizes This does not apply to cases where the value fluctuates due to noise During the measurement...

Page 42: ...ure to turn off the power to the measurement circuit Otherwise electric shock may occur or the instrument may be damaged 1 1 2 2 For the DT4223 The position of the rotary switch varies depending on the model Detection Threshold Buzzer Short circuit detection 25 Ω 10 Ω Sounds continuous buzzer sound Open detection 245 Ω 10 Ω Does not sound ...

Page 43: ... buzzer intermittent buzzer sound 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 1 1 Anode Cathode In the case of the opposite connection The open terminal voltage is approx 2 5 V or less To avoid damage to the measurement object check the specifications of the measurement object before use ...

Page 44: ...tment for the displayed value 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 1 1 The open terminal voltage is approx 2 0 V or less The measurement current DC varies depending on the range To avoid damage to the measurement object c...

Page 45: ...cuit Otherwise electric shock may occur or the instrument may be damaged Do not measure the capacitor which has been charged 2 2 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 circuit...

Page 46: ...ric shock do not use 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 detection deteriorates Check that the detection function operates normally before use p 32 2 2 1 1 1 Select the measurement function 2 Move the instrument close to the...

Page 47: ...s up at the bottom of the display Auto range Sets the optimum range automatically in accordance with the actual measurement Manual range Sets the specific range manually When the 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 ...

Page 48: ...est range is specified once again Example When the range is 6 000 V to 600 0 V 6 V 60 V 600 V 6 V To switch from the manual range to the auto range press for at least 1 second DT4223 DT4224 Press RANGE MANUAL lights up Each time is pressed the range is switched When the key is pressed at the highest range it returns to auto range Example When the range is 6 000 V to 600 0 V 6 V 60 V 600 V auto ran...

Page 49: ...Measured Value The measured value is retained The bar graph is updated Retaining the measured value manually HOLD To retain the measured value press HOLD lights up and the measured value is retained To cancel the hold state press it again HOLD goes off ...

Page 50: ...ed value stabilizes a beeping sound is generated and the value is retained HOLD lights up When the test leads are moved away from the measurement object reconnected again and the measured value stabilizes a beeping sound is generated and the new measured value is retained When is pressed while HOLD is lit the instrument returns to the wait state HOLD blinks Press for at least 1 second to cancel au...

Page 51: ... 12 0 V Start Start End Start End Measurement Conditions for auto holding Measurement Function Fluctuation range Threshold value AC voltage DC voltage excluding the 600 0 mV range 6 000 V 60 00 V 600 0 V range within 120 counts 6 000 V 60 00 V 600 0 V range 120 counts AUTO V within 120 counts 120 counts Resistance Continuity within 100 counts 4900 counts Diode within 40 counts 1460 counts The auto...

Page 52: ...ction can be used when measuring the AC voltage and the AC DC automatic judgment The passband setting for the low pass filter can be selected Example 1 FILTER OFF Example 2 FILTER 100 Hz Press for at least 1 second 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 passband se...

Page 53: ...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 54: ...ing capacity capacitor measurement When the following measurement function is selected this function is disabled AUTO V Frequency Diode Electric charge detection The DT4223 and DT4224 can display relative values for frequency input Checking the relative value REL Example 1 DC voltage measurement For the DT4221 DT4222 When the standard value is measured press for at least 1 second For the DT4223 DT...

Page 55: ...ferring to the table below Measurement function V Ω Condition of the test leads Short circuit Open 3 3 1 1 2 2 Example 1 Resistance measurement DT4222 DT4223 DT4224 1 Select the measurement function 2 Connect the test leads to the measurement terminals 3 Allow the test leads to short circuit DT4222 Press for at least 1 second DT4223 DT4224 Press for at least 1 second After zero adjustment 0 0 Ω 4 ...

Page 56: ...Capacitor measurement DT4222 DT4224 1 Select the measurement function 2 Connect the test leads to the measurement terminals 3 Allow the test leads to open DT4222 Press for at least 1 second DT4224 Press for at least 1 second After zero adjustment 0 000 μF 4 Measure the capacitor ...

Page 57: ... 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 the rot...

Page 58: ...ing change Method Canceling the auto power save function APS APS goes off See p 51 The APS and OFF displays are shown alternately When the power is turned off the settings are disabled Disabling the automatic backlight deactivation See p 51 The backlight auto and OFF displays are shown alternately When the power is turned off the settings are disabled DT4221 DT4222 The setting is retained even if ...

Page 59: ... Ver 1 00 Displaying all indicators Second position from OFF Check that there are no missing indicators If any indicator is missing stop using the instrument and send it for repair Displaying the serial number Third position from OFF The 9 digit serial number is displayed 3 digits at a time Example 123456789 ...

Page 60: ...54 Power on Option Table ...

Page 61: ...4221 DT4222 2 0 15 V DT4223 DT4224 Dimensions Approx 72W 149H 38D mm 2 83 W 5 87 H 1 50 D including the holster and rotary switch Mass Approx 190 g 6 7 oz including the battery and holster Operating environment Indoors pollution degree 2 altitude up to 2000 m 6562 ft Operating temperature and humidity Temperature 10 C to 50 C 14 F to 122 F DT4221 DT4222 10 C to 65 C 14 F to 149 F DT4223 DT4224 Hum...

Page 62: ...er proof IP42 EN60529 Drop proof distance 1 m on concrete with the holster attached Product warranty period 3 years excluding the measurement accuracy Accessories DT4911 Test Lead Holster attached to the instrument with a test lead holder Instruction Manual LR03 Alkaline battery 1 not installed in the instrument Options See Options sold separately p 2 Standards Safety EN61010 EMC EN61326 ...

Page 63: ... 0 8 seconds 0 V 100 V auto range operation 1 ACV 0 6 to 0 7 seconds 0 V 100 V auto range operation 1 Ω 1 0 to 1 1 seconds Infinity 0 Ω auto range operation 1 Continuity Open circuit or short circuit is detected for at least 0 5 ms 1 3 Open circuit or short circuit is detected for at least 600 ms 1 4 Display update rate Measured value 5 times s excluding capacitance and frequency after the range i...

Page 64: ...r voltage 1 5 V continuity measurement input short circuited backlight lit Rated power 36 mVA 20 or less Power voltage 1 5 V DCV measurement backlight off 6 mVA 20 or less Power voltage 1 5 V auto power save function activated Continuous operating time LR03 alkaline battery Backlight off Approx 40 hours 3 Approx 35 hours 4 1 Until the values stabilize within the accuracy specification range 2 Meas...

Page 65: ... 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 as the least significant digit 1 AC voltage Range Accuracy 1 Input impedance 40 to 500 Hz Over 500 Hz to 1 kHz 6 000 V 1 0 rdg 3 dgt 2 5 rdg 3 dgt 11 2 MΩ 2 0 100 pF or less 60 00 V 1 0 rdg 3 dg...

Page 66: ...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 is not specified in 500 Hz or more 2 Frequency Range Accuracy 99 99 Hz 0 1 rdg 2 dgt 999 9 Hz 0 1 rdg 2 dgt 9 999 kHz 0 1...

Page 67: ...5 dgt 11 2 MΩ 2 0 60 00 V 0 5 rdg 5 dgt 10 3 MΩ 2 0 600 0 V 0 5 rdg 5 dgt 10 2 MΩ 1 5 Overload protection 660 V DC 660 V AC or 3 106 V Hz energized for 1 minute DT4221 DT4222 Overload protection 750 V DC 750 V AC or 3 106 V Hz energized for 1 minute DT4223 DT4224 Auto range movement threshold 6000 counts or more for upper range 540 counts or less for lower range 4 AUTO V Range Accuracy 1 Input imp...

Page 68: ...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 is not specified in 500 Hz or more 5 Continuity Range Accuracy Measurement current 600 0Ω 1 0 rdg 5 dgt 200 μA 20 Open circuit voltage 1 8 V DC or less DT4221 DT4222 2 0 V DC or less DT4223 DT4224 Overload protection 600 V DC 600...

Page 69: ...r 3 106 V Hz energized for 1 minute Current under overload 1 5 mA or less DT4223 DT4224 Maximum capacity load 10 mF Maximum inductive load 10 H Accuracy guarantee condition After zero adjustment has been performed Auto range movement threshold 6000 counts or more for upper range Switches to the high impedance 60 00 MΩ range when the test leads are open regardless of the range 540 counts or less fo...

Page 70: ...t Open circuit voltage 1 500 V 0 9 rdg 5 dgt 0 5 mA 20 DT4221 DT4222 0 2 mA 20 DT4223 DT4224 2 5 V DC or less Voltage drop due to battery consumption Overload protection 600 V DC 600 V AC or 3 106 V Hz energized for 1 minute Current under overload Steady state 15 mA or less transient state 0 8 A or less DT4221 DT4222 Overload protection 750 V DC 750 V AC or 3 106 V Hz energized for 1 minute Curren...

Page 71: ... 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 display gently with a soft dry cloth IMPORTA...

Page 72: ...o 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 Question Solution Can zero adjustment be performed Using the relative value display function zero adjustment can be performed p 49 Can rechargeable batteries be used Rechargeable batteries can be ...

Page 73: ...uity check to confirm the continuity of the test leads p 30 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 the value Check...

Page 74: ...olution Err 1 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 2 ROM error Adjustment data Err 4 EEPROM error Memory data Err 5 ADC error Hardware malfunction ...

Page 75: ...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 76: ...Appx 2 RMS and Average ...

Page 77: ...16 01 EN ...

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Page 80: ...EN DT4222 DIGITAL MULTIMETER DT4221 Instruction Manual Aug 2016 Revised edition 2 DT4221A981 02 16 08H DT4223 DT4224 ...