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   HT9020 

 

 

  

 

EN - 19

5.5. 

DC CURRENT MEASUREMENT 

 

 

CAUTION 

 

  The maximum measurable DC current is 1000A. When the display shows 

“

> 999.9A

”, it means that the maximum value that the clamp is capable of 

measuring has been exceeded. Exceeding these limits could result in 
electrical shocks to the user and damage to the instrument 

  We recommend holding the clamp respecting the safety area created by 

the hand protection (see Fig. 3) 

 

 

Fig. 9: DC current measurement 

 

1. After positioning the selector switch to “

A

”, the screen 

nearby will appear. 

Mod Har Fnc

Zro

                   

A C     < 4 2 . 5   H z

 

 
 

       

0 . 0      

A

                     

 

 

2. Press 

F1

 (

Mod

) to open the drop-down menu shown on the 

screen aside  and select the “

DC

” option with the same key 

3. Press 

F4

 (

OK

) to confirm 

4. Press 

F4

 (

Zro

) to perform the zero of value at display 

Mod 

Har Fnc

OK 

                   

A C     < 1 0 . 5   H z

 

 
 

     

- - - -      

A

                     
 

AC  

DC

 

Inrush 100A 
Inrush 1000A 
Esc 

Содержание HT9020

Страница 1: ... Copyright HT ITALIA 2016 Release 1 02 01 03 2016 HT9020 User manual ...

Страница 2: ......

Страница 3: ...tage measurement 12 5 4 1 Voltage Harmonics measurement 14 5 4 2 Phase Sequence and Phase Conformity 15 5 5 DC Current measurement 19 5 6 AC AC DC Current measurement 21 5 6 1 Current Harmonics measurement 23 5 6 2 Dynamic Inrush current measurement 24 5 7 DC Power and Energy measurement 26 5 8 AC AC DC Power and Energy measurement 30 5 9 Resistance and Continuity test measurement 36 6 MAINTENANCE...

Страница 4: ... this manual and on the instrument CAUTION observe the instructions given in this manual an improper use could damage the instrument or its components High voltage danger electrical shock hazard Double insulated meter AC voltage or current DC voltage or current Connection to earth 1 1 PRELIMINARY INSTRUCTIONS This clamp has been designed for use in environments of pollution degree 2 It can be used...

Страница 5: ...EMENT OVERVOLTAGE CATEGORY Standard IEC EN61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements defines measurement category commonly called overvoltage category In 6 7 4 Measured circuits circuits are divided into the following measurement categories OMISSIS Measurement category IV is for measurements performed at the source of...

Страница 6: ...UE meters instruments measuring the TRMS value of the quantity being tested In the presence of a perfectly sinusoidal wave both families of instruments provide identical results In the presence of distorted waves on the other hand the readings shall differ Average value meters provide the RMS value of the sole fundamental wave TRSM meters instead provide the RMS value of the whole wave including h...

Страница 7: ... package contains all components indicated in 7 3 In case of discrepancy please contact the Dealer In case the instrument should be replaced please carefully follow the instructions given in chapter 8 2 3 2 INSTRUMENT POWER SUPPLY The instrument is supplied by 2x1 5V LR03 AAA batteries Replace them following the instructions in 5 2 3 3 CALIBRATION The instrument has the technical specifications de...

Страница 8: ...or switch 5 H ESC key 6 F1 F2 F3 F4 OK function keys 7 LCD display 8 Input terminal V 9 Input terminal COM Fig 1 Instrument description 4 1 2 Alignment marks 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 Conductor Fig 2 Alignment marks ...

Страница 9: ...e hand protection This protection is always located in a suitable position to guarantee a correct safety distance from possible exposed or live parts see Fig 3 4 1 4 Indication of the conventional direction of Current The Fig 4 shows an arrow which indicates the conventional direction of current Fig 4 Current direction arrow ...

Страница 10: ...n provided with a backlight function which is turned on and off by long pressing H key If the feature is set in MAN mode see 5 1 the backlight deactivates after approximately 30 seconds after its activation in order to save battery life The same key identify the ESC Exit functionality inside the different modes of the instrument 4 3 INITIAL SCREEN When switching on the instrument the initial scree...

Страница 11: ... OK key to confirm the selected item The Saved data message is displayed for a while in the bottom part of display The symbol is displayed with auto power off feature activated and the instrument switches off after approx 5 minutes of idleness Backlight In the Backlight section it is possible to select the activation mode of display backlight Press F2 F3 keys for the selection of the MAN option ba...

Страница 12: ...eding these limits could result in electrical shocks to the user and damage to the instrument Fig 5 DC Voltage measurement 1 By positioning the selector switch to V the screen aside will appear Mod Har Fnc A C 4 2 5 H z V 2 Press F1 Mod key to open the drop down menu shown on the screen nearby and select the DC option with the same key 3 Press the F4 OK to confirm Mod Har Fnc OK A C 4 2 5 H z V AC...

Страница 13: ...lays the minimum value of the measured DC Voltage Cr it constantly displays the maximum positive crest value Cr it constantly displays the minimum negative crest value RST RESET it deletes all stored Max Min Cr and Cr values and re start with a new measure ESC it goes back from Max Min Cr Cr and return to normal measuring mode Mod Fnc OK D C 9 V 7 By pressing F4 OK the selected item is confirmed N...

Страница 14: ...xceeding these limits could result in electrical shocks to the user and damage to the instrument Fig 6 AC AC DC voltage measurement 1 By positioning the selector switch to V the screen nearby will appear Mod Har Fnc A C 4 2 5 H z V 2 Press F1 Mod to open the drop down menu shown on the screen aside and select the AC option with the same key 3 Press F4 OK to confirm Modd Har Fnc OK A C 4 2 5 H z V ...

Страница 15: ...ll through the available items as follows Max it constantly displays the maximum value of the measured AC DC Voltage Min it constantly displays the minimum value of the measured AC DC Voltage Cr it constantly displays the maximum positive crest value Cr it constantly displays the minimum negative crest value RST RESET it deletes all stored Max Min Cr and Cr values and re start with a new measure E...

Страница 16: ...plays the maximum RMS value of the selected current harmonic Min it constantly displays the minimum RMS value of the selected current harmonic Abs it displays the absolute value of the harmonics in Volts it displays the value of the harmonics as percentage value with respect to the fundamental RST RESET it deletes all stored Max Min values and re start with a new measure Esc it goes back to a norm...

Страница 17: ... shown on the screen nearby and select the Ph Seq option with the same key 2 Press F4 OK to confirm Mod OK A C 4 2 5 H z V 3 The instrument shows the PH1 message and waits for the detection of L1 phase 4 Connect red cable to input lead V and black cable to input lead COM then position the leads respectively to the L1 phase and the ground reference PE of the circuit under test see Fig 7 Mod P h S e...

Страница 18: ...he Discon Message is shown Disconnect the test lead from phase L1 cable Mod P h S e q Discon Wait 7 The message PH2 is shown and the instrument waits for the detection of L2 phase Connect the test lead to phase L2 cable see Fig 7 Mod P h S e q PH2 Wait CAUTION If more than 3 seconds elapse before detecting phase L2 the instrument displays the message Time Out It is necessary to repeat the measurin...

Страница 19: ...ormity test CAUTION While measuring the instrument must be held in the operator s hand Fig 8 Verification of phase conformity 1 The instrument shows the screen nearby and waits for the detection of L1 phase of the first system 2 Connect the red cable to the input lead V and the black cable to the input lead COM then position the leads respectively to the L1 phase of the first system and the ground...

Страница 20: ...t lead to L1 phase of the second system Mod P h S e q PH2 Wait CAUTION If more than 3 seconds elapse before detecting the phase L1 of the second sequence the instrument displays the message Time Out It is necessary to repeat the measuring cycle from the beginning by pressing F3 New key and starting again from step 1 6 When a voltage higher than or equal to 100V is detected the instrument emits a s...

Страница 21: ...rument We recommend holding the clamp respecting the safety area created by the hand protection see Fig 3 Fig 9 DC current measurement 1 After positioning the selector switch to A the screen nearby will appear Mod Har Fnc Zro A C 4 2 5 H z 0 0 A 2 Press F1 Mod to open the drop down menu shown on the screen aside and select the DC option with the same key 3 Press F4 OK to confirm 4 Press F4 Zro to ...

Страница 22: ... value of DC current Cr it constantly displays the maximum positive crest value Cr it constantly displays the minimum negative crest value RST RESET it deletes all stored Max Min Cr and Cr values and re start with a new measure Esc it goes back to a normal measuring mode Mod Fnc OK D C 100 0 A CAUTION Always carry out current zeroing before clamping the cable The measurement of the 4 Max Min Cr an...

Страница 23: ... instrument We recommend holding the clamp respecting the safety area created by the hand protection see Fig 3 Fig 10 AC AC DC current measurement 1 Positioning the selector switch to A the screen nearby will appear Mod Har Fnc Zro A C 4 2 5 H z 0 0 A 2 Press F1 Mod to open the drop down menu shown on the screen nearby and select the AC option with the same key 3 Press F4 OK to confirm 4 Press F4 ...

Страница 24: ...e items as follows Max it constantly displays the maximum value of AC DC current Min it constantly displays the minimum selected value of AC DC current Cr it constantly displays the maximum positive crest value Cr it constantly displays the minimum negative crest value RST RESET it deletes all stored Max Min Cr and Cr values and re start with a new measure Esc it goes back to a normal measuring mo...

Страница 25: ...ys the maximum RMS value of the selected current harmonic Min it constantly displays the minimum RMS value of the selected current harmonic Abs it displays the absolute value of the harmonics it displays the value of the harmonics as percentage value with respect to the fundamental RST RESET it deletes all stored Max Min values and re start with a new measure Esc it goes back to a normal measuring...

Страница 26: ... 10 A 2 Press F3 Lim for the setting of limit threshold value on inrush current and the type of measurement as shown aside Mod Dsp Lim Run D y n a m i c I R C A Fix LIM 2A 3 Press F2 or F3 to set the reference threshold for the saving of event 2A 100A for Inrush 100A and 5A 900A for Inrush 1000A 4 Press F4 OK to confirm and return to main screen OK T h r e s 002 A 5 Press F4 Run key to start the d...

Страница 27: ...k value in 1ms Max RMS value in 16 7ms Max RMS value in 20ms Max RMS value in 50ms Max RMS value in 100ms Max RMS value in 150ms Max RMS value in 200ms Mod Dsp Lim Run PK 18 2 A Fix LIM 2A 7 Press F4 Run to start a new measurement or move the selector to exit from the function ...

Страница 28: ...ser and damage to the instrument We recommend holding the clamp respecting the safety area created by the hand protection see Fig 3 Fig 11 DC power energy measurement 1 After positioning the selector switch to W the screen aside will appear Mod Par Fnc Zro A C 1 0 0 H z kW kV ari kVA 1 P 2 Press F1 Mod to open the drop down menu shown on the screen aside and select the DC option with the same key ...

Страница 29: ...Fig 2 6 The value of DC power is displayed expressed in kW Press F2 Par to open the drop down menu shown on the screen aside and select the Volt Curr option for the DC voltage and current measurement Confirm with F4 OK The following screen is displayed Mod Par Fnc OK D C 1 60 kW 7 The screen shows an example of DC Voltage and Current measurements Mod Par Fnc Zro D C 80 0 V 20 0 A 8 Press F2 Par to...

Страница 30: ... menu shown on the screen aside At each subsequent pressure of F3 the cursor will scroll through the available items as follows Max it constantly displays the maximum value of the measured parameter Min it constantly displays the minimum value of the measured parameter RST RESET it deletes all stored Max Min values and re start with a new measure Esc it goes back to a normal measuring mode Mod Par...

Страница 31: ...it constantly displays the maximum positive crest value measured Cr it constantly displays the minimum negative crest value measured RST RESET it deletes all stored Max Min Cr and Cr values and re start with a new measure Esc it goes back to a normal measuring mode Mod Par Fnc OK D C 80 0 V 20 0 A 14 By pressing F4 OK the selected item is confirmed Nearby an example of measurement with active Max ...

Страница 32: ...specting the safety area created by the hand protection see Fig 3 Fig 12 AC AC DC power measure on Single phase and balanced Three phase systems 1 After positioning the selector switch to W the screen aside will appear Mod Par Fnc Zro A C 1 0 0 H z kW kV ari kVA 1 P 2 Press F1 Mod to open the drop down menu shown on the screen aside and select the AC 1P Single phase measurement or AC 3P balanced T...

Страница 33: ...rm signal AC DC and this can be very useful for measurements on impulsive signals typically of no linear loads e g welders electric ovens etc Press F2 Par and select with the same key the PF DPF option for the power factor PF and Cosphi DPF measurement Confirm with F4 OK The following screen is displayed Mod Par Fnc OK D C 1 60 kW 1 P 7 The screen shows an example of PF and DPF measurement The i a...

Страница 34: ...age value of harmonic voltage is displayed It is possible to measure up to the 25th harmonic Par Fnc h05 2 3 V ThdV 2 4 12 Press F2 Par to open the drop down menu shown on the screen aside and select the Harm Current for the reading of current harmonic value Confirm with F4 OK The following screen is displayed Mod Par Fnc OK D C 1 60 kW 1 P 13 Pressing F1 or F4 it is possible to move the cursor ov...

Страница 35: ...UTION Since the menu contains functions with a different meaning Max Min and Abs it is necessary to enter the menu twice once for displaying Abs or values and second time to enable the Max or Min functions 15 Pressing F4 OK the selected item is confirmed Nearby an example of current harmonic measurement with active Max function The display shows the active function RMS Fnc H01 100 0 A ThdI 10 0 Ma...

Страница 36: ...z 21 47 kW 7 68 kV ari 22 90 kVA 1 P 20 Pressing F4 OK the selected item is confirmed Nearby an example of power measurement with active Max function The display shows the active function Mod Par Fnc Zro M a x A C 5 0 0 H z 21 47 kW 7 68 kV ari 22 90 kVA 1 P 21 While measuring AC DC voltage or current press F3 Fnc to open the drop down menu shown on the screen aside At each subsequent pressure of ...

Страница 37: ...ng F4 OK the selected item is confirmed Nearby an example with active Max function The display shows the active function Mod Par Fnc Zro M a x A C 5 0 0 H z 80 0 V 20 0 A 23 For the use of HOLD and backlight features see 5 1 ...

Страница 38: ...r test and discharge all capacitors if present Fig 13 Resistance measurement 1 Positioning the selector switch to the screen aside will appear Mod Fnc 30 0 kΩ 2 Press F1 Mod to open the drop down menu shown on the screen aside and select the Resistance option with the same key 3 Press F4 OK to confirm Mod Fnc OK 30 0 kΩ Resistance Continuity Help ...

Страница 39: ...y option with the same key 7 Press F4 OK to confirm The instrument changes into Continuity test mode and the following screen is displayed Mod Fnc OK 30 0 kΩ 8 Press F3 Lim key to set the limit value of Continuity test if the measured resistance is lower than the set limit resistance value e g Res Lim 1Ω the buzzer sounds continuously Mod Fnz Lim 300 Ω Res Lim 1 Ω 9 Press F2 or F3 and set the limi...

Страница 40: ...tance value measured Min it constantly displays the minimum resistance value measured RST RESET it deletes all stored Max Min values and re start with a new measure Esc it goes back to a normal measuring mode Mod Fnc OK 50 0 kΩ 12 Pressing F4 OK the selected item is confirmed Nearby an example of measurement with active Max function The display shows the active function Mod Fnc M a x 50 0 kΩ 13 Fo...

Страница 41: ...rrying out this operation make sure you have removed all cables from input leads or the cable under test from clamp jaws 1 Turn the switch on OFF position 2 Disconnect the cables from the inputs and the cable under test from the clamp jaws 3 Loosen the screws from battery cover and remove it 4 Remove the flat batteries from the battery compartment 5 Insert two new batteries of the same type see 7 ...

Страница 42: ... 999 9A 0 1A 1 0 rdg 5dgt 1000ADC ACrms Max Crest Factor 1 41 Fundamental 50 60Hz 15 Bandwidth 42 5Hz 1725Hz AC DC Current MAX MIN CREST Function Range Resolution Accuracy Response time MAX MIN CREST 0 5 999 9A 0 1A 3 5 rdg 5dgt 1sec Max Crest Factor 1 41 Fundamental 50 60Hz 15 Bandwidth 42 5Hz 1725Hz Resistance and Continuity test Range Resolution Accuracy Protection against overload 0 0 199 9 0 ...

Страница 43: ...red for sinusoidal waveform 42 5 69Hz Voltage 10V Current 2A Pf 0 9 Reactive Energy AC AC DC TRMS Range kVARh Resolution kVARh Accuracy 0 00 99 99 0 01 2 0 rdg 3dgt 100 0 999 9 0 1 Input impedance 1MΩ Accuracy referred for sinusoidal waveform 42 5 69Hz Voltage 10V Current 2A Pf 0 9 Power factor cosphi Range Resolution Accuracy 0 20 1 00 0 01 2 0 rdg 2dgt Input impedance 1MΩ Accuracy referred for s...

Страница 44: ...150 hours of use in W position Auto power OFF after 5 min of idleness disabled Display Characteristics graphic display 128x128 pixels Sampling rate 128 samples per period base sampling Updating frequency 1time s 7 2 ENVIRONMENT 7 2 1 Environmental conditions for use Reference calibration temperature 23 5 C 73 41 F Operating temperature 0 40 C 32 104 F Allowable relative humidity 80 HR Storage temp...

Страница 45: ...ovided 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 due to improvements in technology 8 2 SERVICE If the instrument does not operat...

Страница 46: ...e period 9 2 CALCULATION OF POWERS IN AC 3P MODE The instrument measures the values of Rms Voltage and Rms Current and calculates the average Power values for each period The formulas for power calculation are N i i i i v N Q 1 1 3 N i i N i i i N v N S 1 2 1 2 1 1 3 2 2 Q S P S P Pf where N number of samples in the period 9 3 CALCULATION OF POWERS IN DC MODE The instrument measures the values of ...

Страница 47: ...network voltage the fundamental has a frequency of 50 Hz the second harmonic has a frequency of 100 Hz the third harmonic has a frequency of 150 Hz and so on Harmonic distortion is a continuous problem and must not be confused with short duration phenomena such as peaks drops or fluctuations It can be seen from 1 that each signal consists of the sum of infinite harmonics However an order number ex...

Страница 48: ...of electrical systems In most countries the network voltage used is three phase 50 60Hz supplied by a transformer with triangle connected primary circuit and star connected secondary circuit The secondary circuit generally generates 230V AC between phase and neutral and 400V AC between phase and phase Balancing loads for each phase has always been a problem for electrical system designers Approxim...

Страница 49: ...fect on protected wires Increase of iron loss due to hysteresis cycle distortion and due to the generation of leakage currents on the magnetic core Heating of insulation material due to a possible DC component that can generate saturation of the magnetic core column Motors Increase of loss due to overheating of internal circuits and possible damage of insulation material The 5th and 11th harmonic ...

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