ENGLISH User`s manual
Contents
1. Fig 3 DC voltage measurement Turn the selector on V Insert the test leads into the jacks the red plug into HzVQunA jack and the black plug into COM jack Fig 3 Connect the red and black test leads to the positive and negative poles of the circuit under test respectively The voltage value will be displayed with automatic detection of the range Press RANGE key to activate the manual mode the AUTO symbol disappears from display Press cyclically RANGE to change the position of the decimal point on the display To activate the Autorange function keep pressed RANGE for at least 1 second The message OL means that the voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety The symbol on the display means that voltage has opposite direction than shown in Fig 3 For minimum and maximum value measurement HOLD and Relative AREL functions please refer to paragraph 4 2 EN 10 wn HT37 HT39 4 3 2 AC voltage measurement _ CAUTION fh Maximum input for AC voltage is 1000V rms Do not attempt to take any voltage measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument gem aa Di mmm Stitt Wun Fig 4 AC voltage measurement Turn the selector on V Insert the test leads into the jacks the red plug into2. Power the circuit under test The current value is displayed The message OL means that the voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety If the measured value is lower than 4mA to get a better resolution e Switch off the circuit under test e Turn the selector on pA e Remove the red test lead from A jack and insert it into HzVQuA jack e Power the circuit under test The symbol on the display means that current has opposite direction than shown in Fig 5 Press RANGE key for manual range only active in A position of the rotary selector For minimum and maximum value measurement HOLD and Relative AREL functions please refer to paragraph 4 2 EN 12 Hi ezn HT37 HT39 4 3 4 AC current Measurement wech ou CAUTION ih Maximum input for AC current is 10A Do not attempt to take any current measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument weer Tag bezu HT39 D D Logan uinbu DUDES MIN MAX PEAK A RANGE HOLD aie l Si A O Fig 6 AC current measurement Switch OFF the circuit under test Turn the selector on A Insert the test leads into the jacks the red plug into A jack and the black plug into COM jack Fig 6 Connect red and black plug
3. for that reason the norm requires that the transient withstand capability of the equipment is made known to the user EN 4 Hi ezn HT37 HT39 2 GENERAL DESCRIPTION This instrument performs the following measurements DC Voc and AC Vac TRMS Voltage DC lbc and AC lac TRMS Current Resistance and Continuity test Diode test Frequency Capacitance all selectable by means of a 10 position function selector including OFF position FUNCTION keys are also available see chapter 4 2 An analogical bargraph is also available The selected quantity is displayed with indication of measuring unit and active functions The instrument disposes of an Auto Power Off function consisting in an automatic switching off 30 minutes after last pressure on keys or rotation of selector To resume normal operation turn the selector on OFF and switch it on again 2 1 MEAN VALUE AND TRMS DEFINITION Safety testers for AC quantities are divided in two big families e MEAN VALUE instruments measuring only the value of the wave at the fundamental frequency 50 or 60 Hz e TRUE ROOT MEAN SQUARE or TRMS instruments measuring the true root mean square value of the quantity under test In presence of a perfectly sinusoidal wave both families provide identical results While in presence of distorted waves readings are different Mean value instruments provide only the value of the fundamental wave while TRMS instruments provide the
4. Frequency measurement ENEE 16 4 3 6 Resistance measurement ccceeeeceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 17 4 3 7 Diode test and continuity A EE 18 4 3 8 Capacitance measurement EEN 19 ES MAIN TENAN OE eraa a a a a a Sot e a a a aa a A OSA 20 5 1 General Information EE 20 5 2 Battery Feplatement2eicdegegeeege rdrc uiedeedeegeCge edeede deed dee EEgeCgeedeb ege 20 5 3 Fuse Replacement ase ie cra sacs seaceccence canes cansecntenmcemesanasenasuunonnsetuageangebasetcnenmcmesanen 21 A e CENING E 21 6 TECHNICAL SPECIFICATIONS EE 22 6 1 Technical Features cients tasecrenescie rerreanadenesduecereicinenenetdasueouueainnaadueuencucnesemebtneyeneyes 22 6 1 1 ee dere 23 6 E2 EE 23 6 1 3 General data EE 24 6 2 ENVONMEM sinnini niaaa a i iaaa da aaia 24 6 2 1 Environmental CONGIMONS occa cidncccnetidincieneitncrencldneisnendneuencudneadmendaantnasoucuinendethes 24 6 2 2 EMC and LVD eegene 24 6 3 ACCESSOMES cecicndesectrenteewisnyeenrteeviveypeaybeevaunubeeutueybeaybenybueubveyivey bey ae y Nen ONSEN E KE 24 e OSERVICE EE 25 7 1 CERN 25 T2 SONICO Sege EEN 25 Hi ezn HT37 HT39 1 SAFETY PRECAUTIONS AND PROCEDURES This instrument conforms with safety Standard EN 61010 1 related to electronic measuring instruments For your own safety and to avoid damaging the instrument follow the procedures described in this instruction manual and read carefully all notes preceded by this symbol When ta
5. HzVQunA jack and the black plug into COM jack Fig 4 Connect the red and black test leads to the positive and negative poles of the circuit under test respectively The voltage value will be displayed with automatic detection of the range Press RANGE key to activate the manual mode the AUTO symbol disappears from display Press cyclically RANGE to change the position of the decimal point on the display To activate the Autorange function keep pressed RANGE for at least 1 second The message OL means that the voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety For minimum and maximum value measurement HOLD function and Peak measurement please refer to paragraph 4 2 EN 11 iw HT37 HT39 4 3 3 DC current measurement ROD oo CAUTION measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument fh Maximum input for DC current is 10A Do not attempt to take any current gem vm er j HA Be H MIN MAX PEAK A RANGE HOLD Fig 5 DC current measurement Switch OFF the circuit under test Turn the selector on A Insert the red test lead into A jack and the black plug into COM jack Fig 5 Connect red and black plugs in series with the circuit under test respecting the polarity and current flow indicated in Fig 5
6. necessary replaced with identical ones Do not test or connect to any circuit exceeding the specified overload protection Do not effect measurements under environmental conditions exceeding the limits indicated in paragraph 6 2 1 Make sure that batteries are properly installed EN 2 Hi ezn HT37 HT39 e Before connecting the test probes to the installation make sure that the function selector is positioned on the required measurement e Make sure that LCD and function selector indicate the same function 1 2 DURING USE Read the recommendations which follow and the instructions in this manual CAUTION An improper use may damage the instrument and or its components or injure the operator e When changing the range first disconnect the test leads from the circuit under test in order to avoid any accident e When the instrument is connected to measuring circuits never touch any unused terminal e When measuring resistors do not add any voltage Although there is a protection circuit excessive voltage could cause malfunctioning e f during measurement the displayed values remain constant check whether the HOLD function is active 1 3 AFTER USE e After using the instrument turn it off e f you expect not to use the instrument for a long period remove the battery to avoid leakages of battery liquids which may damage its inner components EN 3 NHT HT37 HT39 1 4 MEASURING OVERVOLTAGE
7. reduce the stray capacitance Before connecting the test capacitor note the display which may show a reading other than zero whenever the range is changed Subtract this offset reading from the test result of a capacitor to obtain the true value Connect the test capacitor to the input clamps noting the polarity connections when required Sih vg Auukululunt UU in Wati o Wm EK MIN MAX PEAK A RANGE HOLD Fig 10 Capacitance measurement Turn the selector on Insert the test leads into the jacks the red plug into HzVQuA jack and the black plug into COM jack Fig 10 Connect the test leads to the capacitor terminals taking care of the shown polarity The capacitance value will be displayed with automatic detection of the range Press RANGE key to activate the manual mode the AUTO symbol disappears from display Press cyclically RANGE to change the position of the decimal point on the display To activate the Autorange function keep pressed RANGE for at least 1 second The message OL means that the voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety For minimum and maximum value measurement HOLD and Relative AREL functions please refer to paragraph 4 2 EN 17 iw HT37 HT39 5 MAINTENANCE 5 1 GENERAL INFORMATION This is a precision instrument To guarantee its per
8. 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 TRMS instruments provide higher values than MEAN VALUE instruments 2 2 TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR DEFINITION The effective current 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 ona resistor disperses the same energy which would be dispersed in the same period of time by a direct current having an intensity of 1A From this definition comes the numerical to T expression G f g 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 P 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 EN 5 wn HT37 HT39 3 PREPARATION FOR USE 3 1 INITIAL This instrument was checked both mechanically and electrically prior to shipment All possible cares and precautions were taken to let you receive the instrument in perfect conditions Notwithstandin
9. CATEGORIES DEFINITIONS The norm EN 61010 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 paragraph 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 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 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
10. ENGLISH User s manual ITALIA CE Hi ezn HT37 HT39 Content 1 SAFETY PRECAUTIONS AND PROCEDURES issssssssssssenrrresssersrrnrrnnsssrrrrrrnnnrnesent 3 Leds Preliminary EE 3 Ee e aoa scci cateesdecawaienwiiseniiendeica disease diode diteaupuadMumcnantepsmenrMenccuaiuadeuatitiasliua wits tail 4 T3 After USE isoo E e a tees EREA E ETE 4 1 4 Measuring overvoltage categories definitions 2 0 0 2 ceeeeeeeeeeeeeeeeeeeeeeeeeenneeeeeeees 5 2 GENERAL DESCRIP TION ssssssssssssssnnrsesssserrrrnrnrsssserrrrrnrrnesserrnnnnnnneneeetnnntnnnrenent 7 2 1 MEAN VALUE AND TRMS DEEINITION eee ceeeeeee cece eee eeeeeeeeeeeeeeeeeeeeeeee 7 2 2 TRUE ROOT MEAN SQUARE VALUE and CREST FACTOR definition 7 3 PREPARATION FOR USE eegene 8 SN BE T e i AE E E EE EE EEEE 8 Dae MUDDY EE 8 3 3 e E de 8 SR cca EE 8 4 OPERATING INS HEN eege geed geet 9 4 1 Jeepen geed 9 Gu SR Front TEE 9 4 2 FUNCTION EE etegteteeeeieegegeeEeElEEEeEeE 10 4 2 4 MIN MAX EE 10 422 PEAK E 10 423 RANGE pisri e E r eee en ee 10 4 2 Ag MOLD EE 10 4 2 5 RS 232 for connection to PC HT39 on 11 4 2 6 BACKLIGHT AN HT39 ont 11 4 2 7 Disable AutoPowerOFF cccsccccesestncnccenteeneeesdececsnedeeenrenteacuendeneteendeeneseueuene 11 4 3 EE 12 4 3 1 DC voltage measurement acesexinscciirset ci ugeduet ges ueeeEeE 12 4 3 2 AC voltage measurement EEN 13 4 3 3 DC current NEE 14 4 3 4 AC current Measurement nnn 15 4 3 5
11. aves the offset value on the display and the AREL symbol is shown The following measurement will be referred to this offset value By pressing again PEAK A key the offset value is shown and the AREL symbol is blinking To exit this function keep pressed PEAK A for at least one second or rotate the selector on another position 4 2 3 RANGE By pressing RANGE key the manual mode is activated and the RANGE symbol is displayed Press RANGE cyclically to change the measuring range and fix the decimal point on the display RANGE is disabled on positions A and A performing measurements in Autorange Keeping press for at least 1 second RANGE key or moving the rotary switch to exit from this mode 4 2 4 HOLD By pressing HOLD the measured value is frozen on the display where the symbol HOLD appears To exit this function press HOLD again or rotate the selector to another position EN 8 wn HT37 HT39 4 2 5 RS 232 for connection to PC HT39 only HT39 can be connected to a PC by means of the optional software package mod SW39 software serial cable To connect HT39 to a PC proceed as follows WM 3928 v RS 232 en a zi HT39 E y sang 3928 elt sx 392i AT Ke 232 e A MIN MAX PEAK A RANGE HOLD MIN MAX PEAK A RANGE HOLD O oC Of 1 2 Fig 2 Connection of HT39 to a PC 1 Insert the connector of the serial cable in the serial input on the upper side of the meter
12. d Relative AREL functions please refer to paragraph 4 2 EN 15 Hi ezn HT37 HT39 4 3 7 Diode test and continuity test CAUTION A Before taking resistance measurements in circuit remove power from the circuit being tested and discharge all capacitors Cuan mas An apo IR eh uod MIN MAX PEAK A RANGE HOLD Fig 9 Diode test Turn the selector on Ia Insert the test leads into the jacks the red plug into HZVQuA jack and the black plug into COM jack Fig 9 Connect the red lead to the positive side anode of the diode and the black lead to the negative side cathode The meter displays the diode voltage to approximately 0 4 0 9V for good junction Reverse the connections and measure the voltage across the diode again The message OL on the display corresponds to a correct junction The continuity test is always active and the test is performed using the test leads in the same way of resistance measurement refer to paragraph 4 3 6 The buzzer is on for resistance values lt 500Q For minimum and maximum value measurement HOLD and Relative AREL functions please refer to paragraph 4 2 EN 16 wi HT37 HT39 4 3 8 Capacitance measurement CAUTION Before taking any in circuit or capacitance measurement remove power from the circuit being tested and discharge all capacitors Use the short test lead pair for measurement in order to
13. ed for one year against material or production defects in accordance with our general sales conditions During the warranty period the manufacturer reserves the right to decide either to repair or replace the product Should you need for any reason to return back the instrument for repair or replacement take prior agreements with the local distributor from whom you bought it Do not forget to enclose a report describing the reasons for returning detected fault Use only original packaging Any damage occurred in transit due to non original packaging will be charged anyhow to the customer The warranty doesn t apply to e Accessories and batteries not covered by warranty e Repairs made necessary by improper use including adaptation to particular applications not foreseen in the instructions manual or improper combination with incompatible accessories or equipment e Repairs made necessary by improper shipping material causing damages in transit e Repairs made necessary by previous attempts for repair carried out by non skilled or unauthorized personnel e Instruments for whatever reason modified by the customer himself without explicit authorization of our Technical Dept The contents of this manual may not be reproduced in any form whatsoever without the manufacturer s authorization Our products are patented and our logotypes registered We reserve the right to modify specifications and prices in view of technological improveme
14. ent complies with EN 61010 1 Insulation class 2 double insulation Pollution degree 2 Overvoltage category CAT IV 600V CAT III 1000V V Q pA CAT IV 500V A For indoor use max height 2000m EN 21 HT37 HT39 6 1 3 General data Mechanical characteristics Dimensions with holster Weight including battery Power supply Battery type Low battery indication Battery life AutoPowerOFF Display Specifications Over range indication 6 2 ENVIRONMENT 6 2 1 Environmental conditions Reference temperature Working temperature Relative humidity Storage temperature Storage humidity 6 2 2 EMC and LVD This tester was designed in accordance with EMC standards in force and its compatibility has been tested in accordance with EN61326 1 1997 A1 1998 A2 2001 164x82x44mm about 400g 9V NEDA1604 JISOO6P IEC6F22 ig displayed when battery voltage is too low about 300 hours 30 minutes after last pressure on keys or rotation of selector 4 LCD with max reading 4000 counts symbol decimal point and bargraph OL or OL 2a 5 0 30 C lt 80 20 60 C lt 80 6 3 ACCESSORIES Standard accessories Optional accessories Test leads e Carrying bag mod B80 Battery fitted e only for HT39 software serial Instruction manual cable mod SW39 Warranty card EN 22 wn HT37 HT39 7 SERVICE 7 1 WARRANTY CONDITIONS This instrument is guarante
15. erload protection E ane gt 1 5VACrms 40 00kHz 0 01kHz lt 5VACrms 400 0kHz 0 1kHz 0 01 rdg 1dgft 600Vrms 4 000MHz 0 001MHz gt 2VACrms 40 00MHz 0 01 MHz lt 5VACrms Minimum pulse width 25ns Duty cycle limit gt 30 e lt 70 EN 20 Hi ezn HT37 HT39 e Resistance Range Resolution Accuracy Open voltage Overload protection 400 00 0 10 1 0 rdg 5dgt 4 000kQ 0 001kQ 40 00kQ 0 01kQ 0 7 rdg 2dgt 400 0kQ 0 1kQ WC SET 4 000MQ 0 001MQ 1 0 rdg 2dgt 40 00MQ 0 01MQ 1 5 rdg 5dgt e Diode test Accuracy Test Open d Range Resolution 0 4 0 8V current voltage Overload protection Pk 10mV 1 5 rdg 5dgt 1 5mA lt 3V 600V rms e Continuity test Range Buzzer Overload protection Wu R lt 450Q 600V rms e Capacitance Range Resolution Accuracy Overload protection 4 000nF 0 001nF 3 0 rdg 1 Odgt 40 00nF 0 01nF 400 0nF 0 1nF 4 000uF 0 001 uF 2 0 rdg 8gt y 40 00uF 0 01uF SEH 400 0uF 0 1 uF 4 000mF 0 001mF 40 00mF 0 01mF See 6 1 1 Electrical specifications Conversion TRMS Measuring rate 1 5 times per second Temperature coefficient 0 15x accuracy C lt 18 C and gt 28 C NMRR Normal Mode Rejection Ratio gt 50dB for DC parameters and 50 60Hz CMRR Common Mode Rejection Ratio gt 100dB from DC up to 60Hz on DCV gt 60dB from DC up to 60Hz on ACV 6 1 2 Safety The instrum
16. formances be sure to use it according to these instructions and keep it stored on suitable environmental conditions Do not expose it to high temperatures or humidity or direct sunlight Be sure to turn it off after use If you expect not to use the instrument for a long period remove batteries to avoid leakages of battery liquid which could damage the its inner components 5 2 BATTERY REPLACEMENT When the symbol is displayed batteries need replacement CAUTION Before replacing batteries disconnect the test leads from any energized circuits to avoid electrical shocks LEGEND 1 Turn OFF the meter and disconnect the test leads from the input terminals 2 Remove the protective holster from the meter 3 Unscrew the battery cover and remove the battery 4 Insert a new battery of the same type 9V NEDA1604 JISOO6P IEC6F22 observing the proper polarity re screw the battery cover and reposition the protective holster Fig 11 Battery replacement EN 18 HT37 HT39 5 3 FUSE REPLACEMENT CAUTION A Before replacing fuses disconnect test leads from any energized circuit to avoid electrical shock D LEGEND y 1 Turn OFF the meter and disconnect the test leads from the input terminals Remove the protective holster from the meter Unscrew the battery cover and remove the battery Remove the defective fuse and install a new fuse of the same size and rating fast ty
17. g we suggest you to check it rapidly eventual damages may have occurred during transport if so please contact the local distributor from whom you bought the item Make sure that all standard accessories mentioned in paragraph 6 3 are included Should you have to return back the instrument for any reason please follow the instructions mentioned in paragraph 7 3 2 SUPPLY VOLTAGE The instrument is powered by batteries mod 9V NEDA1604 JISOO6P IEC6F22 included in the packaging Battery life is approx 300 hours When batteries are low the symbol is displayed To replace insert batteries follow the instructions indicated in paragraph 5 2 3 3 CALIBRATION The instrument complies with the technical specifications contained in this manual and such compliance is guaranteed for 1 year 3 4 STORAGE After a period of storage in extreme environmental conditions exceeding the limits mentioned in paragraph 6 2 1 let the instrument resume normal operating conditions before using it EN 6 HT HT37 HT39 4 OPERATING INSTRUCTIONS 4 1 INSTRUMENT DESCRIPTION 4 1 1 Front panel LEGEND E 1 LCD display R 2 Functions keys RS 232 ain HT39 RS vm ell Zed eab DG 4 MIN MAX PEAK A RANGE HOLD Fig 1 Instrument description EN 7 and NM keys for HT39 only Rotary selector A input for AC DC current measurements HzVQuA input fo
18. he voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety 6 For minimum and maximum value measurement HOLD and Relative AREL functions please refer to paragraph 4 2 _ EN 14 Hi ezn HT37 HT39 4 3 6 Resistance measurement CAUTION A Before taking resistance measurements in circuit remove power from the circuit being tested and discharge all capacitors Sia ag aaoo IR MIN MAX PEAK A RANGE HOLD eet ni 232 Fig 8 Resistance measurement _ Turn the selector on Q 2 Insert the test leads into the jacks the red plug into HzVQuwA jack and the black plug into COM jack Fig 8 3 Connect the red and black test leads to the circuit under test the resistance value will be displayed with automatic detection of the range 4 Press RANGE key to activate the manual mode the AUTO symbol disappears from display Press cyclically RANGE to change the position of the decimal point on the display To activate the Autorange function keep pressed RANGE for at least 1 second 5 The message OL means that the voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety 6 For minimum and maximum value measurement HOLD an
19. king measurements Avoid doing that in humid or wet places Avoid doing that in rooms where explosive gas combustible gas steam or excessive dust is present Keep you insulated from the object under test Do not touch exposed metal parts such as test lead ends sockets fixing objects circuits etc Avoid doing that if you notice anomalous conditions such as breakages deformations fractures leakages of battery liquid blind display etc Be particularly careful when measuring voltages exceeding 20V to avoid risks of electrical shocks The following symbols are used 1 1 1 O0 Pe Ee CAUTION refer to the instruction manual an improper use may damage the instrument or its components Danger high voltage risk of electric shock Double insulated meter AC voltage or current DC voltage or current PRELIMINARY This instrument has been designed for use in environments of pollution degree 2 It can be used for VOLTAGE and CURRENT measurements on installations of overvoltage category II 1000V and IV 600V This instrument is not suitable for measurements of non sinusoidal voltage and current When using the instrument always respect the usual safety regulations aimed at Protecting you against the dangerous electric currents Protecting the instrument against incorrect operations Only the leads supplied with the instrument guarantee compliance with the safety standards in force They must be in good conditions and if
20. nts or developments which might be necessary 7 2 SERVICE Shouldn t the instrument work properly before contacting your distributor make sure that batteries are correctly installed and working check the test leads and replace them if necessary Should you need for any reason to return back the instrument for repair or replacement take prior agreements with the local distributor from whom you bought it Do not forget to enclose a report describing the reasons for returning detected fault Use only original packaging Any damage occurred in transit due to non original packaging will be charged anyhow to the customer The manufacturer will not be responsible for any damage to persons or things EN 23
21. pe 10A 1000V Make sure the new fuse is centered in the fuse holder Re screw the battery cover and reposition the protective holster Fig 12 Fuse replacement 5 4 CLEANING To clean the instrument use a soft dry cloth Never use a wet cloth solvents or water EN 19 HT37 HT39 6 TECHNICAL SPECIFICATIONS 6 1 TECHNICAL FEATURES The accuracy is indicated as of reading number of digits It is referred to the following environmental conditions temperature 23 C 5 C relative humidity lt 80 e DC voltage Range Resolution Accuracy Input impedance Overload protection 400 0mV 0 imV 4 000V 0 001V 10MQ 1000VDC 40 00V 0 01V 0 5 rdg 2dgt 400 0V 0 1V less of 100pF 750VACrms 1000V 1V e AC TRMS voltage Range Resolution a Input impedance Overload protection 400 0mV 0 1mV Not specified 1 3 rdg 5dgt eee se 50 300Hz 10MQ 1000VDC 750VA ao lte 1 2 rdg 5dgt less of 100pF 50VACrms 750V IV 50 500Hz e DC current Range Resolution Accuracy Output voltage Overload protection 400 0uA 0 1nA 4000uA me lt 5MV pA 600Vrms 1 0 rdg 2dot 10 00A 10mA 2V max peeve 10A 1000V e AC TRMS current Autorange Range Resolution E Output voltage Overload protection 10A 10mA 1 5 rdg 5dgt 2V max 600Vrms e Frequency Range Resolution Accuracy Sensitivity Ov
22. r other measurements COM input HTI HT37 HT39 4 2 FUNCTION KEYS When pressing a key the corresponding symbol is displayed with a beep To resume default state turn the selector on another function 4 2 1 MIN MAX By pressing MIN MAX key maximum and minimum values are measured Both values are stored and can be recalled by pressing the same key The symbol corresponding to the desired function is displayed MAX for maximum value MIN for minimum value MIN MAX key is disabled when HOLD function is active To exit this function keep MIN MAX key pressed for at least 1 second or rotate the selector to another position 4 2 2 PEAK A This key have the double function of measuring max min peak values active for V and A positions of rotary selector and performing relative measurements AREL for any position of rotary selector other than V and A Press cyclically PEAK A to measure and save peak values Pmax and Pin symbols on the display correspond to Maximum Peak and Minimum Peak values respectively which are continuously updated by the meter By keeping pressed PEAK A key for at least 3 seconds CAL symbol appears on the display and the meter performs an auto calibration permitting a higher accuracy on peak measurements To exit this function keep pressed PEAK A for at least one second or rotate the selector on another position By pressing PEAK A key the relative measurement is activated the meter s
23. s in series with the circuit under test as indicated in Fig 5 Power the circuit under test The current value is displayed The message OL means that the voltage exceeds the measuring limits In this case disconnect the test leads from the circuit under test to avoid damaging the instrument or endanger your own safety For minimum and maximum value measurement HOLD function and Peak measurement please refer to paragraph 4 2 EN 13 wn HT37 HT39 4 3 5 Frequency measurement CAUTION fh Maximum input for AC voltage is 750V rms Do not attempt to take any voltage measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument ai waa e LL Ta aan tiny Zoag MIN MAX PEAK A RANGE HOLD Dit Fig 7 Frequency measurement Turn the selector on Hz 2 Insert the test leads into the jacks the red plug into HzVQuwA jack and the black plug into COM jack Fig 7 3 Connect the red and black test leads to the positive and negative poles of the circuit under test respectively The voltage value will be displayed with automatic detection of the range 4 Press RANGE key to activate the manual mode the AUTO symbol disappears from display Press cyclically RANGE to change the position of the decimal point on the display To activate the Autorange function keep pressed RANGE for at least 1 second 5 The message OL means that t
24. see Fig 2 2 Insert the 9 pin connector plug in the PC serial port COM 3 Press RS 232 key to activate the serial connection RS232 symbol is displayed and the APO symbol disappears the AutoPowerOFF function is disabled 4 Run SW39 software and press Connect key to activate the real time visualization of parameters values between the meter and the PC For any detail please refer to the Help on line of SW39 5 Press RS 232 key to exit the RS232 mode 4 2 6 BACKLIGHT N HT39 only By pressing N key it s possible to activate disable the backlight function on the display This function is available on each position of the rotary selector 4 2 7 Disable AutoPowerOFF When the meter is to be used for long periods of time the operator might want to disable the AutoPowerOFF function Once the AutoPowerOFF function is disabled the meter stays on continuously To disable the AutoPowerOFF function e switch OFF the meter e turn ON the meter keeping pressed MIN MAX PEAK A and RANGE keys The AutoPowerOFF function is automatically activated when turning ON again the meter EN 9 wn HT37 HT39 4 3 MEASUREMENTS 4 3 1 DC voltage measurement CAUTION T Maximum input for DC voltage is 1000V Do not attempt to take any voltage _ measurement that exceeds the limits Exceeding the limits could cause electrical shock and damage the multimeter KL a au NO eil
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