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1. see 4 2 3 3 Open the clamp and put inside gt The cables L1 L2 L3 and N if use the Differential methos as shown in Fig 5 obtaining the result as addition of instantaneous values of the currents flowing in the wires gt The PE conductor if use the Direct method 4 The measured result is shown at display 5 For using of Data HOLD and see 4 2 2 For using of analogical output see 4 2 6 1 800 561 8187 www GED com information itm com Miz HT78 5 MAINTENANCE 5 1 GENERAL INFORMATIONS 1 This clamp is an accured instrument Whether in use or in storage please do not exceed the specification requirements to avoid possible damages or dangers 2 Do not place this meter at high temperatures or humidity or expose it to direct sunlight 3 Be sure to turn off the meter after use If you expect not to use the tester for a long time remove the battery in order to avoid leakages of battery liquid that would damage the internal parts 5 2 BATTERIES REPLACEMENT When F appears on the display replace the batteries WARNING Only expert and trained technicians must perform this operation Remove the test leads or the conductor under test before replacing the battery Switch off the meter rotate the selector in OFF position Remove the cable from the jaws Remove the screw from the battery cover and detach the batteries cover Remove the batteries Replace batteries with a same type new one see 6
2. 1 2 Take care to polarity Replace the battery cover and screw Use the appropriate battery disposal methods for Your area AOO OTEO N 5 3 CLEANING For cleaning the instrument use a soft dry cloth Never use a wet cloth solvents or water etc 5 4 END OF LIFE CAUTION this symbol indicates that equipment its accessories and batteries shall be subject to a separate collection and correct disposal Sj 1 800 561 8187 www GED com information itm com HT78 6 TECHNICAL SPECIFICATIONS 6 1 CHARACTERISTICS Accuracy is indicated as rdg number of dgt resolution referred to 23 C 73 F 5 C 41 F RH lt 80 AC TRMS Current Range Resolution Accuracy Bandwidht Max input current 300mA 0 1mA 3Arms 3A 0 001A 30Arms 30A 0 01A hogs Bagy 50 60Hz 300Arms 300A 0 1A 3000A 1A 2 0 rdg 8dgt Ge DC analogical output Range Resolution Accuracy Bandwidht Max input current 300mA imV imA 3Arms 3A 1mV 0 01A 30Arms 30A 1mV 0 1A 1 5 FS 50 60Hz 300Arms 300A 1mV 1A 3000A 1mV 10A rahe alll FS full scale of any range Internal filter Type of filter Cut off frequency Low pass 150Hz 6 1 1 Safety Comply with IEC EN61010 1 IEC EN61010 2 032 Insulation double insulation Pollution degree 2 Max height 2000m 6562 ft Installation category 6 1 2 General data Mechanical characteristics Size Weight
3. direct current having an intensity of 1A From this definition comes the numerical to T expression G E f g t dt The effective value is indicated as RMS root mean square The Crest Factor is defined as the ratio between the Peak Value of a signal and its D effective value CF G This value varies according to the waveform of the signal RMS for a purely sinusoidal wave it s worth 2 1 41 In presence of distortions the Crest Factor assumes higher values as long as the wave distortion is higher 1 800 561 8187 www GED com information itm com Miz HT78 3 PREPARATION FOR USE 3 1 INITIAL The meter has been checked from a mechanical and electrical point of view before shipment Every care has been taken to make sure that the instrument reaches you in perfect conditions However it s advisable to make a rapid check in order to detect eventual damages which may have occurred in transit Should this be the case enter immediately the usual claims with the carrier Make sure that all the accessories listed in 6 3 1 are contained in the package In case of discrepancies contact the dealer In case of returning of the tester please keep to the instructions given in 7 3 2 POWER SUPPLY The instrument is batteries supplied 2x1 5V type AAA LRO3 are included in the package Battery life about 200 hours When batteries are low the symbol A F appears on the display Replace them immediately followi
4. including batteries 1 9kg 67 ounces Max conductor size 108mm 4 Supply Batteries type Low battery indication Battery life AutoPowerOFF Display Characteristics Sample rate Conversion mode Over range symbol 1 800 561 8187 CAT II 600V CAT III 300V to the ground 341 L x 194 W x 52 H mm 13 L x 8 W x 2 H inch 2x1 5V alkaline batteries type AAA LRO3 EST symbol is displayed when the level is low approx 200 hours of continuous use approx 10 minutes of idleness 4 LCD 3200 points plus decimal point sign and bargraph 2 times sec TRMS B www GEE com O L indication at display information itm com Miz HT78 6 2 ENVIRONMENTAL CONDITIONS 6 2 1 Climatic conditions Reference temperature 23 5 C 73 F 41 F Operating temperature 0 40 C 32 F 104 F Operating humidity lt 80 RH Storage temperature 10 60 C 44 F 140 F Storage humidity lt 80 RH This product conforms to the prescriptions of the European directive on low voltage 2006 95 EEC LVD and to EMC directive 2004 108 EEC 6 3 ACCESSORIES 6 3 1 Standard accessories The content of a standard package is the following e Instrument HT78 Carrying bag Batteries Set of belt straps User manual 1 800 561 8187 www GED com information itm com Miz HT78 7 SERVICE 7 1 WARRANTY CONDITIONS This equipment is guaranteed against material faults or production defec
5. 7 2 SERVICE If the equipment doesn t work properly before contacting the SERVICE test the batteries and change them if necessary If the equipment still doesn t work make sure that your operating procedure complies with the one described in this manual In case of returning of the instrument all transport charges must be paid by the customer The instrument must be accompanied by a delivery note indicating the faults or reasons of returning The returned tester must be packed in its original box Any damage occurred in transit because of lack of original packaging will be debited to the customer 1 800 561 8187 www GED com information itm com
6. ENGLISH User manual CE 1 800 561 8187 www GED com information itm com Miz HT78 Table of contents 1 SAFETY PRECAUTIONS AND PROCEDURES nnnnnnnnnnnnnnnnnnnnnnnrnnrnnrnnnnrrnnnsnrrrnnennne 2 1 1 PPT MENA Y Ere e e a aa A Ea a a A E A A 2 1 2 Before use 3 E GE ue EE 3 1 4 Measuring overvoltage categories definitions eee eeeeeeeeeeeeeeeeeeeeeentaaaeeeeeeeeeeeeeae 3 2 GENERAL DESCRIP ION eegne 4 Zi TRMS and MEAN VALUE measuring Imstruments 4 2 2 TRUE ROOT MEAN SQUARE VALUE and CREST FACTOR deimitons 4 So PREPARATION He RE 5 Sil UNM Al e E S AER E ET 5 3 2 e TECH KEE 5 Bid ACANMMALOM RT 5 Se EE 5 4 OPERATING INSTRUCTIONS wircccccncncnccccnscnenccesnneancnssunsnanesunsnsnentnanersntoannnesiensenernnonennns 6 4 1 Instrument description 6 AVMs FROME PANSl sevice cess vuwaseaneccaisteciwadis aE eee a E avd ren neater eid aaa dante SEEE EEES 6 4 2 Description Of parts 7 4 2 1 Range and ON OFF SeleCtol AA 7 d DAA KOY sas sicsscchevccasvenswatdencdecdhadpauesshataccavanhitestatte ceavangduwstin tecced E E TE 7 4 2 3 FILTER Selector AA 7 4 2 4 LOCK selector eer 7 4 2 5 AutobowerOEt cece eee ee ea aeee eee e ee tae a aaaeaeceeeeeeggeaaaeeeceeeeesgdeaaaeeeeeeeeeeeeecesineeeeeesenes 7 4 2 6 DC analogical output 0 2 ce eee enter rete ee eee ete ne ee eer ne ee ee eaeee ee naeeeeeeeaeeeeenieeeeee 8 4 3 How to perform the measurements 9 4 31 AC Current measurement ciliai ea aa aa a aaa
7. TER selector Move the FILTER selector to enable ON or disable OFF the Low pass 150Hz filter during an AC current measurement In this condition a low pass filter with cut off frequency of 150Hz is active on meter in order to reduce the harmonic components of input signal It is reccomanded always to eneable this feature to perform accurate and stable measurement of leakage current 4 2 4 LOCK selector While slowly closing CT during the measurement on strong magnetic fields generated by big currents there might be a case where CT cannot be closed completely In this case use the LOCK selector to lock unlock the jaws of clamp durino a measurement 4 2 5 AutoPowerOFF In order to preserve the internal batteries the meter automatically switch off after about 10 minutes of idleness Press the D H key or turn on again the meter after 10 second from switch off to restore of normal functionality The AutoPwerOFF feature is automatically disabled by the meter during the connection to DCV analogical output bt external datalogger 1 800 561 8187 www GED com information itm com NY HT HT78 4 2 6 DC analogical output The meter is designed with a DC voltage analogical output depending on the measured current value and can be used for connection with external data loggers digital multimeters etc see Fig 2 by using customized cables CAUTION Do not apply any vitage to the DCV output of metere durino the recording ope
8. aae a aaa aa 9 4 3 2 Leakage current measurement on Single phase system 10 4 3 3 Leakage current measurement on Three phase system 11 GR RR E Te 12 5 1 General informations ccecceeee eee e eee ee cece cece eeee cece cece eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneeeeeeeees 12 5 2 Batteries replacement ccccececeeeeeeeeeeeeeeeeeeeeeeeeeeee cess eeeeeeeeeeeeeeeeeeeeeseeeeeeeeneeeseeeeees 12 e E el e E 12 BA Le Ke UE E 12 6 TECHNICAL e Lean LE 13 6 1 Characteristics AAA 13 6 1 1 TEEN geed E gedd eu 13 6 1 2 General data ET 13 6 2 Environmental conditions cccccceeeeeeee cece cece cece cece Ae EEEn EEE EEEEEEEEEEEE EEEE EEEEEEE AEAEE EEEE EEEE 14 6 2 1 Climatic ele Tute E 14 6 3 ee 14 6 3 1 Standard accessories s sssseessekettttetttttt ttrt ttet tt tEn E EnEn AE EEEE EEEEESEEEEEEEEENEESEEEEEEEEE EEEE EEEE EEEE nnne 14 T EE 15 CN e Eat te EE 15 TZ SIV ICS atari EE 15 1 800 561 8187 www GED com information itm com Aw HT78 1 SAFETY PRECAUTIONS AND PROCEDURES This meter complies with IEC EN61010 1 For your own safety and in order to avoid damaging the instrument you re recommended to keep to the instructions contained in this manual and read carefully all the notes preceded by the symbol A Take extreme care for the following conditions while measuring Do not measure voltage or current in humid or wet environment Do not use the meter in presence o
9. ed on meter The meter disposes of an Auto Power Off function consisting in an automatic switching off 10 minutes after last operation 2 1 TRMS AND MEAN VALUE MEASURING INSTRUMENTS Safety testers for alternate quantities are divided into two big families e MEAN VALUE instruments instruments which measure only the value of the wave at the fundamental frequency 50 or 60 Hz e TRUE ROOT MEAN SQUARE instruments also defined as TRMS instruments which measure the true root mean square value of the quantity under test In presence of a perfectly sinusoidal wave both families provide identical results In presence of distorted waves instead the readings are different Mean value instruments provide only the value of the fundamental wave while True RMS instruments provide the value of the entire wave including harmonics within the passband of the instrument Accordingly if the same quantity is measured with both kinds of instruments the measured values are identical only if the wave is purely sinusoidal Should it be distorted True RMS instruments provide higher values than medium value instruments 2 2 TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR DEFINITIONS The current effective value is defined as follows In an interval of time equivalent to a period an alternate current with effective value having an intensity of 1A by passing on a resistor disperses the same energy which would be dispersed in the same period of time by a
10. f explosive gas material combustible gas material steam or dust Insulate yourself from the object to be tested Do not touch exposed metal conductive parts such as sockets fixing objects circuits etc If you detect anomalies of testing end metal part and attachment of the meter such as breakages deformations foreign substances no display etc do not take any measurement The followings symbols are used on meter and user s manual d Caution refer to the instruction manual An incorrect use may damage the tester or its components AN High Voltage ranger electrical shock risk Oy Double insulated instrument d A AC Current d a wm DC Voltage 1 1 PRELIMINARY This apparatus has been designed for use in an environment of pollution degree 2 Indoor use It measures AC CURRENT on CAT II 600V or CAT III 300V plants For overvoltage and categories please see 1 4 You must comply with the usual safety regulations aimed at protecting you against the dangerous electric current and protecting the instrument against an incorrect operation Do not test or connect to any circuit whose current exceeds the specified overload protection Make sure that the batteries are installed correctly 1 800 561 8187 www GED com information itm com wi HT78 1 2 BEFORE USE Always keep to the instructions contained in this manual CAUTION Non compliance with the warnings and or the instructions may damage the tester and
11. n 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 voltage 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 norm requires that the transient withstand capability of the equipment is made known to the user 1 800 561 8187 www GE com information itm com NY HT HT78 2 GENERAL DESCRIPTION HT78 meter can performs the herewith features AC TRMS current measurement up to 3000A AC leakage current measurement with 0 1mA resolution DC voltage analogical output for connection with external data loggers 150Hz low pass filter for reduce harmonic components of input signal Each feature can be selected by using rotation selector on meter s front panel The Data HOLD FILTER and LOCK functions are still available see 4 2 The selected quantity appears on a LCD display with indication of measurement units and functions Analogical bargraph it s also display
12. ng the instructions given in 5 2 3 3 CALIBRATION The tester complies with the technical features listed in this manual Its performances are guaranteed for one year 3 4 STORAGE In order to guarantee the accuracy of the measurements after a period of storage in extreme environmental condition wait for the necessary time so that the tester returns to normal measuring conditions see environmental specifications 6 2 1 1 800 561 8187 www GED com information itm com Mie HT78 4 OPERATING INSTRUCTIONS 4 1 INSTRUMENT DESCRIPTION 4 1 1 Front panel 6 FILTER D HOLD 8 AC TRM AUTO POWER OFF HT78 aace cwr Caman 2 LEGEND a te OONAN Fig 1 Instrument description 1 800 561 8187 www GED com Inductive clamp jaw Holes for carrying straps LOCK selector Selector with measurement ranges and ON OFF feature Jaw trigger FILTER selector D HOLD key LCD display DCV analogical output terminal information itm com Miz HT78 4 2 DESCRIPTION OF PARTS 4 2 1 Range and ON OFF selector Rotate the function selector from OFF position to any other position to turn on the meter Rotate again the selector to OFF position to switch off the meter 4 2 2 D H key Press D HOLD key to enable Data HOLD feature The DH message is shown and the measured value is frozen on the display Press the same key to exit from the function 4 2 3 FIL
13. or its components or injure the operator e When the clamp is connected to the circuits to be tested never touch unused terminals e When measuring current any strong current near or close to the clamp jaw will affect the accuracy e When measuring current always put the tested conductor in the middle of the clamp jaw in order to obtain a more accurate reading e lf the reading value or the sign indication remains unchanged during the measurement check if the HOLD function is active 1 3 AFTER USE e Once the measurements are completed turn OFF the meter e f you expect not to use the clamp for a long time remove the batteries 1 4 MEASURING OVERVOLTAGE CATEGORIES DEFINITIONS The norm IEC EN61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements defines what measuring category usually called overvoltage category is On 6 7 4 Measuring circuits it says OMISSIS circuits are divided into the following measurement categories 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 control units e Measurement category Ill is for measurements performed in the building installation Examples are measurements on distribution boards circuit breakers wiring including cables bus bars junctio
14. ration External Logger Fig 2 Connection of meter with external logger 1 Select the desired measuring range and consider the herewith conversion values AC current range DC output voltage range 300MA 1mV 1mA 3A 1mV 0 01A 30A 1mV 0 1A 300A 1mV 1A 3000A 1mV 10A Table 1 Conversion values of DCV analogical output 2 Connect the external logger to the DCV output of meter 3 Perform the current measurement see 4 3 1 800 561 8187 www GED com information itm com Miz HT78 4 3 HOW TO PERFORM THE MEASUREMENTS 4 3 1 AC Current measurement CAUTION Ah Do not perform any AC current measurement on circuit with nominal voltage higher to 500V to round to avoid possible electrical shocks and to damage the meter Fig 3 Taking AC current measurement 1 Select a measurement range among the 3A 30A 300A or 3000A options 2 Move the FILTER selector on ON position to activate the Low pass 150Hz filter see 4 2 3 3 Open the clamp and put the conductor to be tested in the middle of the clamp jaw then reading will be displayed 4 For using of Data HOLD and see 4 2 2 For using of analogical output see 4 2 6 1 800 561 8187 www GED com information itm com Miz HT78 4 3 2 Leakage current measurement on Single phase system CAUTION Ah Do not perform any AC current measurement on ci
15. rcuit with nominal voltage higher to 500V to round to avoid possible electrical shocks and to damage the meter D R N FILTER D HOLD HT78 wace o ae LH Fig 4 Taking leakage current measurement on Single phase systems 1 Select the 300mA range on the meter 2 Move the FILTER selector on ON position to activate the Low pass 150H filter see 4 2 3 3 Open the clamp and put inside gt The cables L1 and N if use the Differential method as shown in gt Fig 4 obtaining the result as addition of instantaneous values of the currents flowing in the wires gt The PE conductor if use the Direct method 4 The measured result is shown at display 5 For using of Data HOLD and see 4 2 2 For using of analogical output see 4 2 6 1 800 561 8187 www GED com information itm com Miz HT78 4 3 3 Leakage current measurement on Three phase system CAUTION Ah Do not perform any AC current measurement on circuit with nominal voltage higher to 500V to round to avoid possible electrical shocks and to damage the meter L1 L2 L3 FILTER D HOLD CHB ln HT78 tass oam E ST Fig 5 Taking leakage current measurement on Three phase systems 1 Select the 300mA range on the meter 2 Move the FILTER selector on ON position to activate the Low pass 150H filter
16. ts in accordance with the general sales conditions During the warranty period one year faulty parts may be replaced The manufacturer reserves the right to decide either to repair or replace the product In case of returning of the instrument all transport charges must be paid by the customer The instrument must be accompanied by a delivery note indicating the faults or reasons of returning The returned tester must be packed in its original box Any damage occurred in transit because of lack of original packaging will be debited to the customer The manufacturer is not responsible for any damage against persons or things Accessories and batteries are not covered by warranty The warranty won t be applied to the following cases e Faults due to improper use of the equipment Faults due to combination of the tester with incompatible equipment Faults due to improper packaging Faults due to servicing carried out by a person not approved by the company Faults due to modifications made without explicit authorisation of our technical department e Faults due to adaptation to a particular application not provided for by the definition of the equipment or by the instruction manual The contents of this manual cannot be reproduced in any form without our authorization Our products are patented Our logotypes are registered We reserve the right to modify characteristics and prices further to technological developments

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