ht_ht77n_clamp_meter..
Contents
1. Display backlight sensor ee ee I WHT HT77N Data Auto HOLD Peak Wide 50 60Hz Compare TRUE RMS LEAKAGE CLAMP oy Me ae aor 5 AutoHold PeakHold m sT 0s ES EAE LAE AutoRange AEA kN lara Compare Auto Backlit Fig 1 Instrument description 4 1 2 Alignment marks and hand protection Put the conductor as close as possible to the middle of the jaws on the intersection of the indicated marks see Fig 2 in order to meet the meter accuracy specifications CAPTION 1 Alignment marks 2 Cable 3 Hand protection 4 Safe area Fig 2 Alignment marks and hand protection Always keep your hands under the hand protection This protection is always located in a suitable position to guarantee a correct safety distance from possible exposed or live parts loan Ein O Quality HT Products Online at www GlobalTestSu Dply com sales GlobalTestSupply com AW HT HT77N 4 2 DESCRIPTION OF FUNCTIONS KEYS 4 2 1 O Data Auto Peak Hold key Switching on off shortly pressing the J key allows switching on the clamp While switching on the display shows the charge percentage of the power supply battery Replace the battery the 0 appears see 5 2 To switch off the clamp press and hold the I key for about 3 seconds Enabling disabling the auto power off function Long pressing the I key gt 3 seconds allows switching on the clamp without enabling the APO Auto Power Off function2. With enabled auto power off the clamp switches off after approx 20 minutes of idleness Enabling disabling the AutoHold function Long pressing the I key gt 5 seconds allows switching on the clamp enabling the AutoHold function With enabled function the clamp automatically freezes the measured data when the measured current value goes from OA to a higher value with at least 10 digits The display shows AutoHolad and the buzzer beeps three times in a short time The clamp automatically exits the AutoHold condition after 5 seconds when no current is measured Data Hold Shortly pressing the I key while measuring current allows holding the current value shown on the display The display shows Hola With active Hold function if the measured current increases by 50 digits with respect to the value shown on the display the internal buzzer sounds continuously and the current value shown on the display flashes Shortly pressing the I key again allows exiting the Hold mode Peak Hold Long pressing the key gt 1 second during current measurement allows enabling the Peak Hold function When the function is enabled the full scale is forced in manual mode and the display shows PeakHolad Shortly pressing the D key allows exiting the Peak Hold mode Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 4 2 2 Wide 50 60HZ Compare key Wide 50 60Hz Shortly pressing t
3. method in a three phase load indirect method in a three phase load Leakage current measurement with Direct method on earth conductors Switch on the clamp by pressing the O key Select the desired capacity with the Range key or keep in the Autorange mode Open the clamp jaw and connect the clamp as shown in Fig 4 or Fig 6 The leakage current value will be shown on the display 4 For Hold Data Hold Auto Hold and Peak Hold feature refer to 4 2 Leakage current measurement with Indirect method Switch on the clamp by pressing the O key Select the desired capacity with the Range key or keep in the Autorange mode Open the clamp jaw and connect the clamp as shown in Fig 5 or Fig 7 The leakage current value will be shown on the display 4 For Hold Data Hold Auto Hold and Peak Hold feature refer to 4 2 w N oi Quality HT Products Online at www GlobalTestSupply com _ sales GlobaltestSupply com AW HT HT77N 5 MAINTENANCE 5 1 GENERAL INFORMATION 1 The instrument you purchased is a precision instrument While using and storing the instrument carefully observe the recommendations listed in this manual in order to prevent possible damage or danger during use 2 Do not use the instrument in environments with high humidity levels or high temperatures Do not expose to direct sunlight 3 Always switch off the instrument after use In case the instrument is not to be used fora long time remove the battery to avoid liquid l
4. rdg 11dgt 0 10A 0 10A 60A 0 01A 1 rdg 8d ot 2 rdg 11dgt 10 50A 10 50A 2 rdg 10dgt 10 rdg 1 1 dot 50 100A 50 100A 10 rdg 10dogft 85 rdg 1 1 dgt With this capacity there may be an instability of 3 digits in readings Frequency range 50 400Hz Overload protection 600V rms Error due of position cable not in center of jaws 1 rdg Error due to the influence of an external magnetic field of an adjacent conductor 0 04 typical value Response time PEAK HOLD feature 50ms Additional error due to the Crest Factor CF of non sinusoidal signals C F 1 4 2 0 gt Add 1 0 rdg C F 2 0 2 5 gt Add 2 5 rdg C F 2 5 3 0 gt Add 4 0 rdg Max Crest Factor 1 6 with 6000 5000 digits 2 0 with 5000 3000 digits 3 0 with 3000 0 digits AC current with low pass filter Accuracy Accuracy 50 core ns 400z 6mA 0 001mA 60mA 0 01mA 2 rdg 8dat 600mA 0 1mA l 9 at A 0 001A Not specified 60A 0 01A 0 10A 2 rdg 8dot 10 50A 100A 0 1A 8 rdg 10dgt 50 100A 12 rdg 10dogft With this capacity there may be an instability of 3 digits in readings Characteristic attenuation approx 24dB oct Cutting frequency approx 100Hz Overload protection 600V rms Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com Quality HT Products Online at wa 6 1 1 Electrical specifications Conversion type Sample rate Temperature coe
5. A 13 Pols Waranty CONGINOMS ges a E E 13 Po DON E ee eT 13 Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 1 PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with directive IEC EN61010 1 relevant to electronic measuring instruments For your safety and in order to prevent damaging the instrument please carefully follow the procedures described in this manual and read all notes preceded by the symbol with the utmost attention CAUTION AN Failure to comply with the caution notes and or instructions may damage the instrument and or its components and be a source of danger for the operator Before and after carrying out the measurements carefully observe the following instructions e Do not carry out any current measurement in humid environments e Do not carry out any measurements in case gas explosive materials or flammables are present or in dusty environments e Avoid contact with the circuit being measured if no measurements are being carried out e Avoid contact with exposed metal parts with unused measuring probes circuits etc e Do not carry out any measurement in case you find anomalies in the instrument such as deformation breaks substance leaks absence of display on the screen etc In this manual and on the instrument the following symbols are used CAUTION observe the instructions given in this manual an improper use could damag
6. ENGLISH User manual CE Quality HT Products Online at www GlobalTestSu Dply com sales GlobalTestSupply com AW HT HT77N Table of contents 1 PRECAUTIONS AND SAFETY MEASURES occ ccc ecceeeeeeeeeeneeeeeeeeeeeeeeeenaees 2 1 1 Preliminary WAS HUG HOI vnsterrecectsstisrencstincienteietenntssniisatiinciiatisnttsatisateiniisainiactiatisatisatiatiiaiiatiias 2 1 2 PUMA WIS lt cxxccctecctccsretixdectctexctersterstexsierstersterstexsterstnsdtecdtncstersterdtersterstesstessietdiasdissdinssinesinedinesinnss 3 pE PALO OS Oe EEEE 3 1 4 Definition of measurement OVervoltage CateQOry sssssssssssssssssssssssssssssssssssssesseseeees 3 2 GENERAL DESCRIPTION ic oncccutnatisntennddanicininiauaddaanuaneinaanoinenaeentateanisidinasdeidimdsuniean 4 23 ad en ag a USE ee eC eee EEES 4 314 WING CGS rae cascetrencecsanextencttdnencednansmentecnetaateaxthentececmeatraninentiuatsanttannceatmeceantramiteaienseantranteentees 4 3 2 Instrument power supply rrnrrrrnrrnrnrnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn annann annann nnana 4 oe CUGO et 4 SF EEE 0 gt 0 E AA Re OnE eS EN EOE SSeS AOR POEM nese non SOLE aS Sn non DEMO nao On enn Nnn Nt nee 4 4 OPERATING INSTRUCTIONS 20 0 ccceccesee eee eeeeeeeeeeeeeseueaeeeeueeaueeueeeneeaeeaeees 5 4 1 Instrument GSS CW ON Osea certeencreeetemsmnsdemeeciaeeenedemcenancbennnad snstaceassianestenconaneansnaedanacnistesaussianscoacemiede 5 4 1 1 Description o
7. ce with the general sales conditions During the warranty period defective parts may be replaced However the manufacturer reserves the right to repair or replace the product The manufacturer declines any responsibility for injury to people or damage to property The warranty shall not apply in the following cases e Repair and or replacement of accessories and battery not covered by warranty e Repairs that may become necessary aS a consequence of an incorrect use of the instrument or due to its use together with non compatible appliances e Repairs that may become necessary as a consequence of improper packaging e Repairs which may become necessary as a consequence of interventions performed by unauthorized personnel e Modifications to the instrument performed without the manufacturers explicit authorization e Use not provided for in the instrument s specifications or in the instruction manual The content of this manual cannot be reproduced in any form without the manufacturer s authorization Our products are patented and our trademarks are registered The manufacturer reserves the right to make changes in the specifications and prices if this is due to improvements in technology 7 2 SERVICE lf the instrument does not operate properly before contacting the After sales Service please check the conditions of batteries and replace them if necessary Should the instrument still operate improperly check that the produc
8. e the instrument or its components Double insulated meter AC current e oO gt DC voltage Ground reference This symbol indicates that the clamp can operate on live conductors J 1 1 PRELIMINARY INSTRUCTIONS e This clamp has been designed for use in environments of pollution degree 2 e ltcan be used for CURRENT measurements on installations with overvoltage category III 300V For a definition of the above mentioned categories see 1 4 e This instrument is not suitable for direct current measurements e Please take the standard safety precautions aimed at protect you against dangerous electric currents and protect the instrument against incorrect use e Do not test circuits exceeding the specified current and voltage limits e Check that the battery is correctly inserted Quality HT Products Online at www GlobalTestSupply com _ sales GlobaltestSupply com AW HT HT77N 1 2 DURING USE Please carefully read the following recommendations and instructions PoC CAUTION A Eee E instrument and or its components or be a source of danger for the operator e Before switching on the clamp remove the conductor from the clamp jaw e When the instrument is connected to the circuit under test do not touch any unused terminal e During current measurement any other current near the clamp may affect measurement precision e When measuring current always put the conductor as near as possible to the middle of the clamp ja
9. eaks that could damage the instrument s internal circuits 5 2 BATTERY REPLACEMENT When the LCD displays the Eh symbol replace the battery CAUTION AN Only expert technicians should perform this operation Before carrying out this operation make sure you have removed the cable being tested from inside the clamp j Fig 8 Battery replacement 1 Switch off the clamp 2 Remove the cable being tested from the clamp jaw 3 Loosen the battery cover fastening screw and remove the cover 4 Disconnect the battery from the connector 5 Fit two new batteries see 6 1 3 and pay attention to correct polarity 6 Position the battery cover back over the compartment and fasten it with the relevant screw 7 Do not scatter old batteries into the environment Use the relevant containers for disposal 5 3 CLEANING THE INSTRUMENT Use a soft and dry cloth to clean the instrument Never use wet cloths solvents water etc 5 4 END OF LIFE X CAUTION the symbol on the instrument indicates that the appliance and its accessories must be collected separately and correctly disposed of aes Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 6 TECHNICAL SPECIFICATIONS 6 1 TECHNICAL CHARACTERISTICS Accuracy indicated as reading digit number resolution at 23 C 5 C lt 80 RH AC TRMS current Accuracy Accuracy 50 60Hz 61 400Hz 6mA 0 001mA 1 rdg 8dgft 2
10. ed with a brightness sensor which in case of low light automatically activates the display s backlight Quality HT Products Online at www GlobalTestSupply com _ sales GlobaltestSupply com AW HT HT77N 4 3 OPERATING INSTRUCTION 4 3 1 AC Current measurement CAUTION A N Insert the cable in the middle of the clamp jaws in order to obtain accurate measures Use the marks as a reference see 4 1 2 Correct Incorrect HT77N 0 Data Auto HOLD Peak Wide 50 60Hz Compare Wide 50 60Hz Compare Fig 3 Use of the clamp for AC current measurement 1 Switch on the clamp by pressing the key 2 Select the desired capacity with the Range key or keep in the Autorange mode 3 Open the clamp jaw and insert the cable in the middle of it see Fig 3 The current value will be shown on the display 4 For Hold Data Hold Auto Hold and Peak Hold feature refer to 4 2 Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 4 3 2 Leakage current measurement CAUTION AN Insert the cable s in the middle of the clamp jaws in order to obtain accurate measures Use the marks as a reference see 4 1 2 Fig 4 Measuring leakage current with direct Fig 5 Measuring leakage current with method in a single phase load indirect method in a single phase load ee Three Phase Fig 6 Measuring leakage current with direct Fig 7 Measuring leakage current with
11. f the CONTrOIS cece eeccecececeeeeeseeeseeeseeeeseueeeseeseesueeeeeseeesaeeeseeeseeeseueeseesanss 5 4 1 2 Alignment marks and hand protection ccccceccecceecseececeeeceeceeeaeeeeeceeeeeeseeseesesaeeseeseeeeeeaeeees 5 4 2 Description Of FUNCTIONS KOYS c cccececceceeeeecceceeeeeasasssssseeeeceeeeeeeeeeeeseeseeaaaaassseeeeeeeeeeeeeess 6 4 2 1 COData Auto Peak Hold Key ecccccccsscccssssssessssssesesssesssssvesessseesesssiesesssessssssessssiesssssitsseassessessveee 6 4 2 2 Wide 50 6GOHZ Compare key cccccceeccceeccceeceeeeeceeeeseeeeseeesseeeseeeeseeeesaeeeseeeseeeseeeesseeesaeegs 7 Bt NO CY scansessccsrcsiananennuhconkamuetnegasinand caeaaonhinanstomnauibnunteussans oanedaGea sahinuabiennaabnun Dia esnaessabiedardimubimnns 7 A24 AWGOBICKIOM SENS ON shnsesnaastantednetmuninnehnesnemnbdes ina hsndelontenmbsunimumamasiabsbabs ieedetonmnnumnanibmnmnbbanstanees 7 4 3 Operating instruction cic es ncceesunnsccseseecsetenenndesssvassencsunsnenssensessentnsdensssncssocusmestoesensatsoounedemnssnteds 8 4 3 1 AC Current measurement cccsccseccesccessusecccusuccerscnesuceucaeuureneusageeessaeeureaersuarsanesueegursaaraersas 8 4 3 2 Leakage current measurement cccccecceeeceeeceecueccuecceceeccuecceeceueceeecaeeueeeueseeeseesseeenensaessas 9 De MAINTENANCE e E E EE A E AA EA A 10 Si General MOT MeO M ireantcatecetecntectonttonthintnntcatarivientictoatioattantieatenttitivuticheatioattantmneamniinhnnntnn
12. fficient 6 1 2 Reference guideline Safety Insulation Pollution level Max height of use Measurement category 6 1 3 General characteristics Mechanical characteristics Size Lx W xH Weight battery included Jaw opening Max cable diameter Power supply Battery type Low battery indication Battery duration Auto Power OFF Display Characteristics 6 2 ENVIRONMENT 6 2 1 Environmental conditions for use Reference temperature Operating temperature Allowable relative humidity storage temperature Storage humidity HT77N TRMS 4 times second 0 2x accuracy C lt 18 C 0 gt 28 C IEC EN61010 1 double insulation 2 2000m 6562 ft CAT III 300V 200 x 70 x 40mm 8 x3 x 2in 265g 9 ounces 40mm 2in 40mm 2in 2x1 5V batteries type AAA LRO3 symbol i at display approx 60 hours after 20 min of idleness 4 LCD 6000 counts decimal point bargraph and backlight 23 5 C 73 41 F 0 C 30C 32 F 86 RH lt 80 30 C 40 C 86 F 104 F RH lt 75 40 C 50 C 104 F 122 F RH lt 45 lt 80 RH 20 60 C 4 F 140 lt 80 RH 6 3 ACCESSORIES 6 3 1 Standard accessories e User manual e Carrying bag e Batteries not fitted www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 7 SERVICE 7 1 WARRANTY CONDITIONS This instrument is warranted against any material or manufacturing defect in complian
13. he Wide 50 60HzZ Compare key allows enabling the low pass filter which has a cutting frequency of approx 100Hz When the function is enabled the full scale is forced in manual mode and the display shows 50 60Hz Shortly pressing the Wide 50 60Hz Compare key again with enabled function allows disabling the low pass filter and going back to the normal measuring mode Compare Long pressing the Wide 50 60HZ Compare key gt 1 second allows enabling the Compare function The display shows Compare and the set current limit value flashes By pressing the Range key it is possible to set the limit comparison current among the following values 0 25mA 0 50mA and 3 5mA To confirm the set value press the Wide 50 60Hz Compare key again With active Compare function if the measured current exceeds the set limit value the internal buzzer sounds continuously and the current value shown on the display flashes Long pressing the Wide 50 60HZ Compare gt 1 second key again with enabled function allows disabling the Compare function and going back to the normal measuring mode 4 2 3 Range key Shortly pressing the Range key allows setting the measuring full scale in manual mode In this condition the display does not show Autorange Pressing the Range key again allows setting the desired full scale To restore the Autorange mode press the Range key for a time gt 2 seconds 4 2 4 Auto Backlight sensor The clamp is equipp
14. he instrument in order to detect possible damage suffered during transport In case anomalies are found immediately contact the forwarding agent We also recommend checking that the packaging contains all components indicated in 6 3 1 In case of discrepancy please contact the Dealer In case the instrument should be replaced please carefully follow the instructions given in 7 3 2 INSTRUMENT POWER SUPPLY The instrument is supplied with two 1 5V AAA LRO3 batteries included in the package In order to prevent compromising its charge the battery is not inserted in the instrument For battery installation follow the instructions given in 5 2 The i symbol appears when the battery is nearly discharged Replace the battery following the instructions given in 5 2 3 3 CALIBRATION The instrument has the technical specifications described in this manual The instrument s performance is guaranteed for 12 months 3 4 STORAGE In order to guarantee precise measurement after a long storage time under extreme environmental conditions wait for the instrument to come back to normal condition see 6 2 1 Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 4 OPERATING INSTRUCTIONS 4 1 INSTRUMENT DESCRIPTION 4 1 1 Description of the controls CAPTION Inductive clamp jaw Opening lever Data Auto Peak Hold key Wide 50 60HzZ Compare key Range key LCD display
15. ntinniat 10 Oe Balen Tena o Ne Mirecnecaca cae saiesare A E A E E E E EE EE EEEE 10 5 3 Cleaning the INSTTUMENT cccccceeeeeesssssssssceeeeceeeceeeeeeessesssssssseeaseeeseeeeeeeeeeeeessssessesssssaaaaees 10 5 4 Endof life ei cctteazcenensedetaemacttondecaceencmdeaudacttacmdacmenanductiacteacteutaduetiagteaatteanduchincteacudateductinsteaaudatances 10 6 TECHNICAL SPECIFICATIONS ccc cccccceccecseeseeseeseeseeeeueeueeeueuueneeeueaeenneaeeass 11 61 MGA AG Fel AG Be LS IGS esera EEEE 11 6 1 1 Electrical specifications cece ceccceecceeeceeeceeeseeeeeeeeseeeeseeeseeesaeeseeeseeesaeeeeueeseeessueeseeessesaeeenes 12 6 1 2 Reference guideline ccccsccccsccceccececcececeueceuecseueceueceuceceeseueesueeseeesueesseeseeesueeseesuesseesges 12 6 1 3 General characteristics vasvoswwinssninwasscsenssencssaninnelsnaeduwslaanasncoesedeeioawGaswieanieuusebinnasedoontededmeeeennaniins 12 oe ENVBONMENT cSecsecnsseaccuatetnaacannnuescccnanondanstosasaunsannenenusenananauontaensonniesiasanniesaacaanguenaansauannenns 12 6 2 1 Environmental conditions for USE cccceccecseeeeeeeceeceeeeeeeeeeceeceeceececseseeseegetseteeseeaeeseeseeeeeees 12 G3 ACCESSO SS rete ccevasarcccrendneutecemnereneatqadsucennetanecenassaanduce pues enateuaheneceuetenantaanincepaecduateamheneetmecancetamats 12 oc a amc 19 6 2 1 Clerc 612 1c 1 0 cae on ee eee ee et nen en nnn ne eee eee rae eee rere re 12 lae EROE ee ersten esse etn ae veel A EE
16. t is operated according to the instructions given in this manual Should the instrument be returned to the After sales Service or to a Dealer transport will be at the Customer s charge However shipment will be agreed in advance A report will always be enclosed to a shipment stating the reasons for the product s return Only use original packaging for shipment any damage due to the use of non original packaging material will be charged to the Customer Quality HT Products Online at www GlobalTestSupply com _ sales GlobaltestSupply com
17. tage installation Examples are measurements on household appliances portable tools and similar equipment e Measurement category is for measurements performed on circuits not directly connected to MAINS Examples are measurements on circuits not derived from MAINS and specially protected internal MAINS derived circuits In the latter case transient stresses are variable for that reason the standard requires that the transient withstand capability of the equipment is made known to the user Quality HT Products Online at www GlobalTestSupply com sales GlobalTestSupply com AW HT HT77N 2 GENERAL DESCRIPTION Dear Customer thank you for choosing one of the instruments in our range If used according to the instructions given in this manual the clamp you have just purchased will guarantee accurate and reliable measures The clamp is designed to guarantee maximum safety thanks to a newly conceived development which ensures double insulation and enables the clamp to reach CAT III 300V in compliance with standard IEC EN61010 1 The instrument carries out the following measurements e AC TRMS current e AC TRMS leakage current e Peak value of AC current 3 PREPARATION FOR USE 3 1 INITIAL CHECKS Before shipping the instrument has been checked from an electric as well as mechanical point of view All possible precautions have been taken so that the instrument is delivered undamaged However we recommend generally checking t
18. w as described in 0 to obtain the most accurate reading e While measuring if the value or the sign of the quantity being measured remain unchanged check if the HOLD or PEAK HOLD function is enabled 1 3 AFTER USE e When measurement is complete switch off the clamp e lf the instrument is not to be used for a long time remove the battery 1 4 DEFINITION OF MEASUREMENT OVERVOLTAGE CATEGORY standard IEC EN61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements defines what measurement category commonly called overvoltage category is In 6 7 4 Measured circuits circuits are divided into the following measurement categories OMISSIS e Measurement category IV is for measurements performed at the source of the low voltage installation Examples are electricity meters and measurements on primary overcurrent protection devices and ripple contro units e Measurement category Ill is for measurements performed on installations inside buildings Examples are measurements on distribution boards circuit breakers wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and equipment for industrial use and some other equipment for example stationary motors with permanent connection to fixed installation e Measurement category Il is for measurements performed on circuits directly connected to the low vol
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