User`s Manual - Multimeter,Multimeters
Contents
1. Attention 1 In an environment with strong noise it is better to use shielded cable when perform small single measurement 2 When the frequency amplitude under test is larger than SOV please press SELECT key in the ACV range to enter frequency function and then make the measurement When high voltage frequency is measured in this method the meter can bear voltage with a peak value up to 1000V which can prevent the meter from being damaged when the voltage amplitude is too high The meter can automatically attenuate the voltage under test to an optimal amplitude value that ICs can handle and has good antijamming ability Auto power off the meter is turned off automatically in approx 15 minutes After it is turned on if no key is pressed and the rang switch knob is not operated Attention To lengthen service life of the battery please turn the power off after use it VI Calibrate the meter Special attention Do not enter calibration mode before read the operating instructions Otherwise calibration data stored in the meter might be lost and normal measurement can be performed with the meter I Key functions of the meter panel in calibration mode 1 1 Gently touch DH BL key the buzzer makes a short sound Here press TEST STOP key several times to adjust the display value up press SELECT key several times to adjust the display value down Gently touch DH BL key again the buzzer makes a lo2. 2 Insulating resistance test 1 Connection of the test terminals Insert one end of the test pen with a high voltage test bar into L terminal socket of the meter Insert one end of the test cable with a test clamp into E terminal socket of the meter Insert one end of the test cable with a black test pen the pen with a clamp G terminal socket of the meter Make a good connection respectively 2 Test connecting cable Connecting cable of E terminal socket of the meter is earthing cable Connecting cable of L terminal socket of the meter with a high voltage test bar is circuit cable Connecting cable of G terminal socket of the meter the pen with a clamp is shielding cable and connected to surface of the to be tested object to prevent surface leakage and affect impedance test 3 Rated voltage selection Select a rated voltage you need in the insulating resistance test Turn the range switch knob to a corresponding voltage position and press SELECT to make selection among min 2min 10min according to test time requirement 4 Connect pen of the test bar to another terminal of the to be tested object Press high voltage switch TEST STOP Here the red indicator light turns on indicating high voltage output for test is connected Actual high voltage value can be displayed in the meter After the test is started numerical value is displayed in the meter The displayed value is the insulating resistance value of the object under test
3. For convenience of use when the set test time comes the meter cuts high voltage off automatically and locks and saves the measured result When the measured result is less than the set minimum resistance value under the measurement voltage ERR is displayed in the meter If there is a need to remeasure press any key to release the lock status and start the measurement over again Attention do not short circuit the two test pens with high voltage output or take measurement of insulating resistance after high voltage is output The improper operation is very easy to generate spark cause fire disaster and damage the meter Special attention in operation Before test make sure the to be tested circuit is not electrified Do not take measurement of any electrified equipment or electrified circuit During test dangerous voltage output exists in the meter Be sure to operate it carefully Ensure the to be tested object is securely clamped and keep your hands away from the test clamp before press TEST key to output high voltage Attention in operation When use 500V measurement voltage to measure resistance less than 2MQ 1000V to measure resistance less than 5MQ and 2500V to measure resistance less than 1OMQ measurement time must not exceed 10 seconds 5 Power off After the test is completed release lock status of the meter and observe voltage display value of the insulating resistance tester When it is less than 50V turn the r
4. HI Name and function of parts see the figure LX 1 Function switch knob Switch among power ON OFF measurement voltage of the insulating resistance and various functions of the multimeter 2 TEST STOP key it is used to measure the insulating resistance RANGE key it is used to switch between hand operated and auto range mode as the meter is used as the multimeter The function is not available when the meter is used as the insulating resistance tester On startup the meter is preset to auto range mode Press the key to switch to hand operated range mode In hand operated range mode every time press the key the range goes up one level until to the maximum level After the maximum level is reached every time press the key the range goes to the minimum level The process is repeated If press and hold the key over 2 seconds the meter is switched to auto range mode 3 SELECT key it is used to set the measurement time of the insulating resistance as well as various function switch of the same position 4 DH BL key Data hold backlight function press the key to lock the displayed result Press it again to restore normal measurement when OL is displayed in the meter Hold function is not available Press and hold the key for 2 seconds to switch between backlight on off in adjustment mode backlight is not available 5 L LINE input terminal connected to line terminal of the to be tested object 6 V Q mA Hz CAP
5. be referenced automatically for ON OFF range when 400Q resistance range is calibrated 4 6 After calibration of various ranges is completed it is necessary to turn the meter off and restart it before the adjusted values take effect Special attention the user who doesn t have calibration conditions should not make the calibration VII Maintenance of the meter Warning It is necessary to turn the power off and disconnect test pens before open the case of the meter or battery cover to prevent danger of electric shock 1 When the sign is displayed in the meter the battery needs to be changed Open the battery cover and replace the old battery with a new one of the same type to ensure the meter works normally 2 To protect internal circuit of the meter it is necessary to replace the fuse with one of the same specifications when the fuse in current range is burned Specifications of the fuse used in the series meters is F 5 00mA 250V fast Be sure to turn the switch knob to OFF position before open the bottom cover to prevent high voltage electric shock 3 Keep the meter and the test pens clean dry and undamaged Use a clean cloth or eradicator to clean the case of the meter Do not use abrasive or organic solvent 4 Avoid mechanical damage shock and impact avoid exposure to high temperature and strong magnetic field VIII Accessories 1 Test cable one set including one red high voltage test pen one black t
6. input terminal common positive input terminal of the digital multimeter 7 COM G input terminal COM is common EARTH of the multimeter G is shielded terminal of the insulating resistance 8 E EARTH input terminal connected to EARTH terminal of the to be tested object 9 Liquid crystal display r Small 8888 measured value of high voltage D T saa HOLD of the insulating resistance N PE on 8888 measured value of various functions Am unF Min measurement time of the insulating Hr resistance minute OL overflow display indicating the measured value exceeds the maximum display value ERR indicating that serious current leakage or short circuit occurs to the equipment EF Battery capacity is insufficient 10 Indicator light of high voltage 11 Holding box of the test cables 12 Ring used to fasten the hanging strip IV General characteristics 1 Auto range OL will be displayed for overload 2 Display mode Liquid crystal display maximum display 4000 3 Sampling rate 2 times per second 4 The meter can display actual insulation test voltage LED light is used to indicate high voltage output status 5 Operating environment 0 C 40 C less than 75 RH 6 Storage environment 10 C 60 C less then 80 RH 7 Maximum power consumption 4 5W minimum power consumption 18mW 8 Indication for insufficient battery capacity E_4 is displayed 9 Power supply 6 pieces of AA 1 5V battery LR6x6 10 Auto p
7. 3 C 5 C less than 75 RH DC voltage DCV Range Accuracy Resolution 400mV 0 1mV AV 0 5 5d lmV 40V 10mV 400V 100mV 1000V 0 8 5d 1V Input impedance 400mV gt 1000MQ 10M2 for other ranges Maximum input voltage DC or AC peak value 1000V AC voltage ACV Range Accuracy Resolution 4V 0 8 5d lmV 40V 10mV 400V 100mV 700V 1 5d 1V Frequency range 40Hz 400Hz 400V and 700V range is 40Hz 100Hz Maximum input voltage DC or AC peak value 1000V Display Average Sine wave virtual value calibration DC current DCA Range Accuracy Resolution 40mA 0 8 5d 10mA 400mA 100mA Overload protection 0 5A 250V fuse AC current ACA Range Accuracy Resolution 40mA 1 5d 10mA 400mA 100mA Overload protection 0 5A 250V fuse Resistance Range Accuracy Resolution 400Q 0 8 5d 0 1Q 4kQ 10 40kQ 10Q 400kQ 100Q 4MQ 1 3d 1kQ 40MQ 2 3d 10kQ Overload protection 250V RMS Capacitance Range Accuracy Resolution 40nF 10pF 400nF 3 5d 100pF 4uF InF 40uF 10nF Overload protection 250V RMS Frequency FREQ Range Accuracy Resolution 40Hz 0 01Hz 400Hz 0 1 Hz 4KHz 1 Hz 40KHz 0 5 3d 10 Hz 400KHz 100 Hz 4MHz 1K Hz Over
8. User Manual of BM3548 and BM3549 Insulation Tester and Multimeter Distinguished users Thank you for purchasing the meter of our company To use the meter correctly please read the operating instructions thoroughly and carefully before use it especially the section of Safety information Please keep the operating instructions in a safe place after reading it putting it where the meter is or keeping it in handy for future reference Attention A test cable is provided for the meter It is not allowed to perform insulation test by holding the test cable with your hands Ensure that the to be tested object is securely clamped and keep your body away from the circuit before press the TEST key to output high voltage I Overview Welcome to use the product BM3548 49 digital multimeter with auto range selection is a real digital insulating resistance tester digital millimeter It has features of complete functions high accuracy reliability in operation and convenience in use Output test voltage can be switched among 250V 500V 1000V 2500V depending on different models An ordinary insulating resistance meter can not measure the output high voltage of its own When the output high voltage of the insulating resistance meter doesn t conform to the rated value it is not easy for the user to find the unconformity so that deviation of the measured result is over large sometimes and causing hidden troubles in safety BM3548 49 can monito
9. ange switch knob to OFF position and then remove the test cable The test is over Attention the meter can not be turned off automatically when it is used as an insulating resistance tester Please turn the range switch knob to OFF position after the test is over Notices in use of the insulating resistance tester 1 Brief introduction The insulating resistance tester can be used to verify completeness of motor transformer switching equipment and coil and cable of electric equipment For example when electric cable or switching equipment low capacitance equipment is tested time related capacitive leakage current is not noticeable and would quickly drop to zero Within a short time one minute or less it will reach a stable conductive leakage current quantity of providing a good condition for spot check of reading short time impedance test In the other hand time related current will last for several hours when the equipment under test is long cable large sized motor or generator high capacitance equipment The current would cause ceaseless change of the reading of the insulating resistance tester It is impossible to obtain an accurate reading If trend analysis among readings can be made for example step voltage or medium absorption test the situation can be overcome The analysis doesn t rely on a single reading but on a large quantity of related readings As time related current drops quickly when low capacitance equipment i
10. current measurement mode Insert one end of the black pen into the jack of COM and one end of the red pen into the jack of V Q mA Hz CAP If take measurement of DC current connect the other end of the two pens in series to the to be tested circuit The value on LCD screen can be directly read If take measurement of AC current press SELECT key to switch to AC current range Connect the other end of the two pens in series to the to be tested circuit and read the displayed value Attention 1 Input current must not exceed the limited value If does there is danger of damaging the meter circuit Resistance and Continuity measurement ZN Warning When perform resistance and continuity measurement it is necessary to guarantee that no voltage is applied across the to be tested circuit or component Set the switch knob to QD position Here the meter is preset to resistance range Insert one end of the red pen into the jack of V Q mA Hz CAP and one end of the black one into the jack of COM Connect the other end of the two pens in parallel to two terminals of the to be tested circuit or component and read the resistance value Press SELECT key to switch to range When the tested resistance value is less than approx 380Q the buzzer would buzz This is continuity test When the pens are open circuited or input is overloaded OL will be displayed on the screen Forward voltage measurement of the
11. diode Turn the switch knob to QOQ position Press SELECT key to switch to F range Insert one end of the red pen into the jack of V Q mA Hz CAP and one end of the black pen into the jack of COM polarity of the red pen is Connect the other end of the two pens in parallel to two terminals of the to be tested diode and read the forward voltage value When the diode is reversely connected or the input terminal is open circuited OL will be displayed on the screen apacitance measurement Warning When perform capacitance measurement it is necessary to guarantee the to be tested capacitor is completely discharged Turn the switch knob to QCAP position Press SELECT key to switch to CAP range Insert one end of the red pen into the jack of V Q Hz CAP mA and one end of the black pen into the jack of COM Connect the other end of the two pens in parallel to two terminals of the to be tested capacitor and read the capacitance value When capacitance value is relatively large it may take over 10 minutes to make the measurement Frequency measurement Turn the switch knob to Hz range Insert one end of the red pen into the jack of V Q mA Hz CAP and one end of the black pen into the jack of COM Connect the other end of the two pens in parallel to the to be tested circuit and read the frequency value Sensitivity of the frequency range is approx 2V RMS
12. e meter until the displayed value of the meter under calibration is the same as that of the monitoring meter IID Select and enter an adjustment mode according to requirements three methods are available 3 1 Turn the switch knob to OFF position Press and hold DH key and then turn the switch knob to the to be adjusted range Release DH key after you hear di di sounds Here the meter enters 2 3 calibration mode 3 2 Turn the switch knob to OFF position Press and hold DH key and SELECT simultaneously and then turn the switch knob to the to be adjusted range Release the keys after you hear di di sound Here the meter enters 2 2 calibration mode 3 3 Turn the switch knob to OFF position Press and hold DH key and TEST STOP key simultaneously and then turn the switch knob to the to be adjusted range Release the keys after you hear di di sound Here the meter enters 2 1 calibration mode IV Examples of calibration 4 1 Use Method 2 3 to calibrate AC current range Insert one end of the red pen into the jack of V Q mA and connect the other end to positive output terminal of the calibration source Insert one end of the black pen into the jack of COM and connect the other end to negative output terminal of the calibration source When enter calibration mode turn the switch knob to mA range Press SELECT key to select AC current measurement mode Gentl
13. easurement Without turning high voltage in the to be calibrated meter calibration source outputs DC 1000V voltage Positive voltage is applied to COM input terminal of the to be calibrated meter and negative voltage is applied to its L terminal After the display is stable press and hold DH BL key 4 4 Use Method 2 1 to calibrate resistance value of the mega ohm range Insert one end of the test pen with high voltage test bar into L terminal socket of the meter Insert one end of the test cable with test clamp into E terminal socket of the meter Insert one end of the test cable with black test pen the pen with a clamp into of G terminal socket of the meter Set output resistance of the resistance box to 100 mega ohms Press SELECT key to select one minute for the timer Turn on high voltage of the to be calibrated meter and output high voltage value is displayed in voltage meter of the mage ohm meter After the display of the meter under calibration is stable press and hold DH BL key After the buzzer makes two sounds all mega ohm ranges under the measurement voltage are calibrated Attention in calibration mode do not press DH BL key when the high voltage is not turned on Otherwise high voltage calibration value would be lost 4 5 No calibration is needed for the frequency range DC4V range is will be referenced automatically for diode range when DC4V range is calibrated 400Q resistance range will
14. est pen one black test cable with a clamp and one test clamp 2 Operating instructions one copy 3 Conformity certificate Warranty card one piece Please visit www multimeterwarehouse com to see the update and more All the specifications are subject change without previous notes Tel 909 628 6088 Fax 909 628 7999 email Kaito earthlink net
15. g every time the temperature goes up for 10 C 18 F with a temperature under 20 C the impedance value at 20 C will be one half of its reading every time the temperature goes down for 10 C 18 F For example when 10MQ impedance at 40 C is converted into the impedance at 20 C its value is 40MQ The conductor temperature can be measured with a non contact infrared temperature tester 4 Work safety To guarantee safety is responsibility of every body However your safety is at your own hands No tool can guarantee your safety Only safe equipment and safe work habit can provide you with the safest protection The followings are some safety tips you should obey In any time put the circuit in power off status as possible as can Take appropriate cut off turn off steps If the ON OFF status is undetermined assume the circuit is electrified You can use AC DC voltage measurement function of the meter to determine if the circuit is in power on status Use protection device for the power on circuit Use insulating tools Put up wear fireproof suit goggle and insulating gloves Take off watch or other adornment Stand on an insulating pad Draw lesson from experienced electricians Keep one hand away from other objects This way will reduce the possibility that closed loop current goes through your thorax and heart When perform insulating resistance test X Do not connect the insulation tester to an electrified c
16. he operating instructions carefully before use the meter 3 It is strictly prohibited to use the meter before its rear cover is put in place Otherwise it might cause an electric shock 4 Check and make sure the insulating layer of the test cable is in good condition without any breakage 5 To avoid electric shock do not touch the test cable and the circuit under test when performing a test 6 Make sure one end of the test cable is securely inserted into the terminal 7 During test any range must not exceed its specified maximum input value 8 During test do not operate the switch knob for changing a range to avoid damaging the meter 9 DC voltage over 50V or AC voltage over 36V can cause danger of electric shock Be careful when taking measurement 10 Before performing insulation test make sure the range selection switch has been set within an appropriate voltage range 11 Do not perform insulating resistance test in a combustible environment Spark may cause explosion 12 Stop using the meter if its case or test cable is broken during use and the metal is exposed 13 When open the rear cover for changing battery make sure the test cable has been removed out of the test terminal and the range switch switched to OFF position 14 Take the battery out when the meter will not be used for a long time 15 When E E is displayed in the meter it is necessary to change the battery in time to ensure measurement accuracy
17. load protection 250V RMS Input sensitivity 2V RMS Attention If the frequency amplitude under test is larger than SOV please press SELECT key of ACV function to enter frequency function and then make the measurement Forward voltage of the diode P Display approximate forward voltage value of the diode Test condition Forward DC currentof approx 0 5mA reverse DC voltage of approx 1 5V Continuity test 2 When the ON resistance is less than approx 380Q the buzzer in the meter buzzes Test condition open circuit voltage of approx 0 5V Operating description of the digital multimeter AC DC voltage measurement Turn the switch knob to V or V range Insert one end of the black pen into the jack of COM Insert one end of the red pen in the jack of V Q mA Hz CAP Connect the other end of the two pens in parallel to two terminals of the to be tested circuit The value on the LCD screen can be directly read Attention 1 Input voltage should not exceed the limited value If does there is danger of damaging the meter circuit When the displayed value is larger than DC1100VHU or AC770V OL is displayed in the meter indicating the input voltage has exceeded maximum limit value of the meter 2 When perform measurement of high voltage circuit be sure that human body will not contact the high voltage AC DC current measurement Turn the switch knob to mA range Here the meter is preset to DC
18. ng sound Press SELECT key or TEST STOP key to restore the initial function Press and hold DH BL key until the buzzer makes two sounds and the current adjusted result is saved In calibration mode DH BL key has no data hold and backlight control function 1 2 TEST STOP key it is high voltage switch or used to adjust display value up depending on DH BL key 1 3 SELECT key it is function switch or used to adjust display value down depending on DH BL key ID Three calibration methods are available for the meter 2 1 Calibrate all ranges of the function Each range has a standard calibration point Except that DC1000V and AC700V range are at 500V point all other ranges are at 1000 point for example 10 00uF point Select any point and all ranges of the function will be calibrated 2 2 The range can be calibrated at any range of any function Operation result only affects the present range the same as in 2 1 Attention The two methods above mentioned are only applicable to advanced users 2 3 The range can be calibrated at any point of any range of any function Even if the user doesn t have signal source that outputs standard points required by the meter the user can monitor the input value of the to be calibrated meter with the monitoring meter as long as the use has a monitoring meter over Level 0 2 Use keys on the panel of the to be calibrate meter to adjust th
19. obtained 1 Shut down the system or equipment and disconnect it from other circuits electric switches capacitors electric brushes lightning rods and circuit breakers Ensure the test is not affected by leakage current that flows through switches and over current protection components 2 The temperature should be higher than dew point of the environmental air If the condition is not satisfied a layer of water smoke will be formed in the insulating surface In some cases it would be absorbed by insulating material 3 In surface of the conductor there should be no carbon and other impurity that are easy to form a conductor 4 The applied voltage should not be too high When low voltage system is tested too high voltage would cause overload or damage a insulator 5 The to be tested system should be fully discharged to the earth The earthing discharge time should be approx fivefold of the charge time 6 Temperature influence is worth attention As insulating resistance is in inverse ratio with insulating material temperature the higher the temperature is the lower the impedance is The recorded impedance reading would be changed by insulating material temperature It is suggested to perform measurement in a standard temperature of 20 C 68 F Compare a reading with a result at a temperature of 20 C according to conventional practice with a temperature over 20 C the impedance value at 20 C will be twofold of its readin
20. onductor equipment Follow manufacturer s suggestions to perform the test X Cut off fuse electric switch and circuit breaker Turn off the to be tested equipment X Disconnect branch circuit wire earthed wire and other equipment from the to be tested equipment X Before and after the test discharge capacitors of the to be tested object Some equipment may have automatic discharge function X Check if there is leakage current going through fuse electric switch and discharge circuit breaker Leakage current would cause incorrect test result x When the insulation is in bad condition equipment would generate electric arc Therefore do not use the insulation tester in a dangerous environment with combustible and explosive gas X When connect test cable use a pair of insulating rubber gloves 5 Important tips What the insulating resistance tester measures is surface to surface resistance value of the object under test but not point to point one Therefore the wire should not be connected to surface of a non conductive object such as cable rubber and plastic case It is necessary to use a conductive material such as silver paper to cover surface of the to be tested object and next connect a wire to the conductive surface and then you can perform the measurement IV Technical characteristics and operating description of the multimeter Accuracy reading number one year warranty Environment to guarantee accuracy 2
21. ower off The multimeter is turned off automatically in approx 15 minutes after it is turned on if no key is pressed or the knob is not turned 11 External dimension 170 length x 156 width 64 height mm 12 Weight Approx 650 grams including the battery V Technical characteristics and operating description of the insulation tester Accuracy reading number one year warranty Environment to guarantee the accuracy 23 C 5 C less than 75 RH Rated measurement voltage valid measurement range and precision Rated voltage Measurement range Accuracy 250V 0 25M 400MQ 0 2M 200MQ 3 rdg 5 500V 0 5MQ 4GQO 200M 4GQ 5 Yrdg 5 1000V 1 5M 40G 4G 40GQ 10 rdg 5 2500V 5M 40GQ Display range Rated voltage Display range auto range Resolution 250V 4M 40M 400MQ 1k 10K 100KQ 500V 4M 40M 400M 4GQ 1k 10K 100K IMQ 1000V 40M 400M 4G 40G 10k 100K 1M 10MQ 2500V 40M 400M 4G 40GQ 10k 100K 1M 10MQ Characteristics of the measurement terminal Rated Allowed range The measurement resistance value that short circuit voltage of open circuit can maintain lower limit of the rated current voltage voltage 250V 90 110 of the 250KQ ERR is displayed when it is Not less than rated voltage less than 200KQ 1 5mA 500V 500KQ ERR is displayed when it is less than 400KQ 1000V 1 5MQ ERR is displayed when it is less than 1MQ 2500V 5MQ ERR is di
22. r the output high voltage in a real time way At any time the user can observe actual measurement voltage that is output by the meter effectively avoiding misjudgment caused due to output voltage not conforming to the rated value The measurement range of the meter can reach up to 40GQ The measurement time can be set up according to requirements After a measurement is completed the measured result can be kept automatically Functions of the digital multimeter include AC DC voltage current resistance capacitance frequency diode and ON OFF measurement The functions of the digital multimeter are completely separated from those of the insulating resistance tester When use functions of the multimeter you need not be worried that you would suffer electric shock due to high voltage generated by the insulating resistance tester The product is applicable to measurement of the insulating resistance of various insulating materials and electric equipments such as transformers motors cables switches and electric apparatuses It is also applicable to maintenance test and inspection of various electric equipments It is compact in structure convenient to carry and an ideal electrical and electronic testing meter of yours TI Safety information 1 Description of safety marks A Warning important safety information the user must read A Danger high voltage electric shock is present L Double insulated protection 2 Read t
23. s tested results from multiply tests are the same Therefore use of the multiply test method will waste time 2 Test in assembly The most important reason of the insulation test is to ensure the public and individual safety Through high voltage DC test among live wire earthing and earthing wire you can eliminate short circuit or earthing phenomenon that is dangerous to the human life Usually the test is performed after preliminary equipment installation is completed Performing the test can find connection error and defective equipment guarantee high quality installation and prevent fire disaster or explosion 3 Test in maintenance Another important reason of the insulation test is to protect and lengthen service life of electric system and motor Electric system is affected by such factors as dust grease temperature stress and vibration for a long time These conditions may cause insulating deterioration loss in production and even fire disaster Regular maintenance and test can provide very valuable information of system wear and tear status and help forecast system failure possibility Solving problems in time can guarantee that a system operates without any fault and effectively lengthen service life of various equipments To obtain meaningful insulating resistance result an electrician should check the to be tested system carefully before take measurement When the following conditions are satisfied the best results will be
24. splayed when it is less than 2MQ Usage for insulating resistance measurement Danger If there is any measurement error it may cause personal injury and meter failure Operate it only after read the operating instructions carefully and thoroughly Our company will take no responsibility for the accident not caused due to any reason of our company Operating description 1 Safety information 1 Watch out for high voltage electric shock When completing the insulating resistance test remove the test cable only after making sure high voltage across the tested object is less than 50V 2 During measurement do not touch the object under test and watch out for high voltage electric shock 3 When test the insulating resistance the object should not be electrified Make sure the to be tested object is securely earthed Before test it is necessary to short circuit and discharge two test terminals of the to be tested object 4 When test the insulating resistance make sure no external voltage is applied to the test circuit 5 Before starting test make sure position of the range switch knob is correct and the test cable is securely connected 6 After press the high voltage key high voltage from 250V to 2500V will be output between L terminal and E terminal depending on different models and positions Here be sure not to touch the meter and exposed part of the object under test Otherwise danger of electric shock would occur
25. y tough DH BL key and the meter makes a short sound Here TEST STOP key and SELECT key can be used to adjust display value of the to be calibrated meter When the calibration output current is AC 10mA adjust display of the calibrated meter to 10 00 Press and hold DH BL key until you hear di di sound AC 10mA range is calibrated If use Method 2 3 to calibrate AC 100mA range just need to increase the calibration current to 100mA The meter automatically switches to AC 100mA range Adjust display of the calibrated meter to 100 0 Then press and hold DH BL key until you hear di di sound 4 2 The voltage output of high voltage generator of the mega ohm range is set up in the factory and adjusted through resistance but not through software 4 3 Use Method 2 1 to adjust measurement voltage of mega ohm range Insert one end of the test pen of the with high voltage test bar into L terminal socket of the meter Insert one end of the red pen into the jack of L and connect the other end to negative output terminal of the calibration source Insert one end of the black pen into the jack of COM and connect the other end to positive output terminal of the calibration source the red is negative and the black is positive Do not make mistake Otherwise the internal circuit would burn When enter calibration mode turn the switch knob to 1000V or 2500V voltage range for mega ohm m
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