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                                                                                                  HT7051 - HT7051N 

 

EN - 9

5.2 INSULATION 

MEASUREMENT IN FIX MODE 

This measurement mode, performed in compliance with IEC/ EN61557-2 guideline, allows 
a quick selection of the test voltage among the values: 250, 500, 1000, 2500, and 
5000VDC. 

 

 

 

CAUTION 

 

 

 

 

  The instrument may be used on installations of overvoltage category CAT 

IV 600V to earth with maximum voltage 600V between inputs. Do not 
connect the instrument to installations with voltages exceeding the limit 
values indicated in this manual. If these limit values are exceeded, the 
operator may be exposed to electrical shocks and the instrument could get 
damaged 

  Always connect the measuring leads to the instrument and to the alligator 

clips with the accessories disconnected from the system 

  It is recommended to hold the alligator clip respecting the safety area 

marked by the hand protection (see § 4.4) 

 

 

Fig. 4: Instrument connection 

1.  Turn on the instrument by press 

ON/OFF/

 key 

 

 

 

2.  Press the 

FUNC/ERASE MEM

 key to select the “FIX” mode 

 

 

 

3.    The display shows a screen similar to 

that reported here to the side, which 
contains: 

  The FIX selected mode 

  The bargraph set to zero 

  The "--- T

Ω

" indication 

  The selected test voltage 

  The test time value 

  The plug symbol (if the instrument 

is supplied from the mains) 

 The battery symbol steadily 

illuminated or flashing (if batteries 
are flat or are being recharged) 

  The TIMER symbol if the duration 

of the test has been set 

 

 

 

 

 

 

Содержание HT7051

Страница 1: ... Copyright HT ITALIA 2021 Release EN 3 01 26 11 2021 ENGLISH User manual ...

Страница 2: ...guration of the test parameters for ADJUST mode 16 5 4 Insulation measurement in RAMP mode 17 5 4 1 Configuration of the test parameters for RAMP 1 mode 21 5 4 2 Configuration of the test parameters for RAMP 2 mode 21 5 4 3 Configuration of the test parameters for RAMP 3 mode 22 5 5 Enable Disable of SMOOTH function 22 5 6 Anomalous situations 22 6 MANAGEMENT OF MEMORY DATA 25 6 1 Save measurement...

Страница 3: ...s are used CAUTION it is necessary to consult the instruction manual to find the type of potential danger and the actions to be taken Observe the instructions reported in the manual An improper use could damage the instrument and lead to dangerous situations for the operator DC voltage or current AC voltage or current Dangerous voltages risk of electric shocks Instrument with double insulation 1 1...

Страница 4: ...t 1 General requirements defines what is intended for measurement category commonly known as overvoltage category In 6 7 4 Measuring circuits it reads Circuits are divided into the following measurement categories Measurement category IV is for measurements performed at the source of a low voltage installation Examples are electric counters and measurements on primary devices protecting against ov...

Страница 5: ...transport Should you detect any anomalies immediately contact the forwarding agent or the dealer Moreover we recommend checking that the package contains all parts listed in 10 4 Should you find any discrepancy please contact the dealer Should it become necessary to return the instrument please follow the instructions reported in 11 3 2 POWER SUPPLY The instrument is power supplied through interna...

Страница 6: ...s which are described in detail below ON OFF key used for Switch on off the instrument Switch on the display s backlighting for 20 seconds short pressing of the key with the instrument already on FUNC ERASE MEM key used for Select the desired function Delete the measurements saved during the display of memory data MODE CLEAR SMOOTH key used for Change the internal modes if there are more available...

Страница 7: ...ade to the parameters START STOP key used for Start and or stop a measurement Table 1 Description of function keys 4 3 DESCRIPTION OF DISPLAY Symbol Description Display group 1 shows Insulation resistance Dielectric leakage current PI Polarization Index DAR Dielectric Absorption Ratio Capacitance Display group 2 shows Nominal test voltage Generated test voltage Display group 3 shows the duration t...

Страница 8: ...ance such as the insulation resistance is very difficult as the value of the currents considered may be very low When measuring to prevent making mistakes it is therefore necessary to take the following precautions CAUTION Keep the measuring leads suspended above the path or anyway make sure the leads do not make contact in more of one point While measuring high resistances the area around the mea...

Страница 9: ...he display appear Then the instrument shows the firmware version then it sets to the last measuring mode selected before turning off 5 1 1 Auto Power OFF If no test is being carried out the instrument automatically turns off after approximately 5 minutes after the last time a key was pressed To reactivate the instrument it is necessary to turn it on again by pressing the relevant key ...

Страница 10: ...t damaged Always connect the measuring leads to the instrument and to the alligator clips with the accessories disconnected from the system It is recommended to hold the alligator clip respecting the safety area marked by the hand protection see 4 4 Fig 4 Instrument connection 1 Turn on the instrument by press ON OFF key 2 Press the FUNC ERASE MEM key to select the FIX mode 3 The display shows a s...

Страница 11: ...he conductor being tested the conductor could remain live at a dangerous voltage because of possible stray capacitances in the circuit tested Never insert the power cord into the Europlug socket 9 During measurement the instrument gives a short acoustic signal every second and the display shows a screen similar to that reported here to the side which contains The FIX selected mode The bargraph pro...

Страница 12: ...easurement is complete and any capacitance has been discharged the instrument shows The value of the measured insulation resistance The value of the generated voltage The duration of the test If the measured resistance value is not between the MIN MAX limits previously set the instrument shows NOT OK the alarm bell and gives a long acoustic signal see 5 4 1 12 Once measurement is complete it is al...

Страница 13: ...MIN 10T Test time value in a range between 00min 05sec 99min 59 sec b Press the arrow keys to change the value of the parameters a long pressing of the keys allows a rapid change of the values c Press the MODE CLEAR SMOOTH key to remove the limit values set for the parameters The display shows the message no to indicate that there is no limit set d After setting press the SAVE key to save the chan...

Страница 14: ...ays connect the measuring leads to the instrument and to the alligator clips with the accessories disconnected from the system We recommend holding the alligator clip respecting the safety area marked by the hand protection see 4 4 Fig 5 Instrument connection 1 Turn on the instrument by pressing the relevant key 2 Press the FUNC ERASE MEM key to select the ADJUST mode 3 The display shows a screen ...

Страница 15: ...om the conductor being tested the conductor could remain live at a dangerous voltage because of possible stray capacitances in the circuit tested Never insert the power cord into the Europlug socket 9 During measurement the instrument gives a short acoustic signal every second and the display shows a screen similar to that reported here to the side which contains The ADJUST function selected The b...

Страница 16: ...easurement is complete and any capacitance has been discharged the instrument shows The value of the measured insulation resistance The value of the generated voltage The duration of the test If the measured resistance value is not between the MIN MAX limits previously set the instrument shows NOT OK the alarm bell and gives a long acoustic signal see 5 3 1 12 Once measurement is complete it is al...

Страница 17: ...V to 5000V Test time value in a range between 00min 05sec 99min 59 sec b Press the arrow keys to change the value of the parameters a long pressing of the keys allows a rapid change of the values c Press the MODE CLEAR SMOOTH key to remove the limit values set for the parameters The display shows the message no to indicate that there is no limit set Only when setting the value of the test voltage ...

Страница 18: ...arts from 0V which is kept for a time T0 reaches the value V1 in a time interval T keeps to value V1 for a time T1 and finally returns to 0 with possible discharge of the residual voltage CAUTION The instrument may be used on installations of overvoltage category CAT IV 600V to earth with maximum voltage 600V between inputs Do not connect the instrument to installations with voltages exceeding the...

Страница 19: ...nput voltage 5 Insert the measuring leads into the relevant input leads of the instrument Rx Rx and GUARD if necessary see 4 5 and Fig 6 CAUTION Make sure that there is no voltage at the ends of the measuring points before connecting them to the measuring leads 6 Connect the alligator clips to the part of the system to be tested 7 Press the START STOP key to perform measurement CAUTION The display...

Страница 20: ...pplied from the mains The battery symbol steadily illuminated or flashing if batteries are flat or are being recharged The timer symbol The two flash symbols to indicate a dangerous voltage The message MEASURING While measuring it is also possible to display the leakage current the capacitance the number N of the cycle the instrument is performing which cyclically show when pressing the arrow keys...

Страница 21: ... 4 2 5 4 3 11 Once measurement is complete it is also possible to display the leakage current the capacitance the number N of cycles in which the set ramp was repeated which cyclically show when pressing the arrow keys CAUTION If the measured resistance value 5 0M the screen displaying the capacitance shows three hyphens to indicate that it was impossible to measure the capacitance and the CAUTION...

Страница 22: ...ey to exit without saving and return to the previous screen 5 4 2 Configuration of the test parameters for RAMP 2 mode a By cyclically pressing the SET DISPLAY MEM key it is possible to select the following parameters Minimum value of the insulation MIN in a range between 0 01M MAX maximum value of the insulation MAX in a range between MIN 10T Value of the starting voltage V0 in a range between 10...

Страница 23: ...g of the keys allows a rapid change of the values c Press the MODE CLEAR SMOOTH key to remove the limit values set for the parameters The display shows the message no to indicate that there is no limit set When setting the value of voltage V0 of time T0 of time interval T of voltage V1 of time T1 and of the number N of cycles by pressing the MODE CLEAR SMOOTH key the default values are set respect...

Страница 24: ...ed here to the side for 3 seconds Afterwards the instrument returns to the initial screen 4 If upon pressing the START STOP key with 2500V nominal test voltage set 5000V and load resistance 5M the capacitance at input leads Rx Rx is allowable limit capacitance the instrument gives a long acoustic signal and displays the screen reported here to the side for 3 seconds Afterwards the instrument retur...

Страница 25: ...the side for 3 seconds Afterwards the instrument returns to the initial screen 7 If there are no memory cells available to save the measurement results upon pressing the SAVE key the instrument gives a long acoustic signal and displays the screen reported here to the side for 3 seconds Afterwards the instrument returns to the initial screen 8 The above mentioned anomalous situations cannot be save...

Страница 26: ...LL MEM key to go back to the previous screen without saving data in the memory 6 2 DELETE MEASUREMENTS 1 Press the ESC RECALL MEM key The display shows a screen similar to that reported here to the side which contains The number of the last memory location used The value of parameter P 2 Press the FUNC ERASE MEM key the instrument displays a screen similar to that reported here to the side which s...

Страница 27: ...M key again to exit memory management 7 RESET OF INSTRUMENT 1 Turn on the instrument by pressing the relevant key 2 Press and hold the SET DISPLAY MEM key After approximately 10 seconds the instrument is reset and turns off 8 CONNECTION OF THE INSTRUMENT TO PC The connection between the PC and the instrument is obtained by means of a serial port and the RS 232 cable supplied with the software pack...

Страница 28: ...he battery CAUTION Only expert and trained technicians should perform maintenance operations Before carrying out this operations make sure you have disconnected all cables from the input terminals 1 Fit the power cord in the Europlug socket see Fig 1 part 2 with no measurements performed by the instrument 2 The symbol is shown at display to indicate the running of recharging process 3 Leave the in...

Страница 29: ...9 99T 5000V Load Capacitive 1nF Outside range indicated by IEC EN61557 INSULATION RESISTANCE OPERATING UNCERTAINTY COMPLIANCE WITH IEC EN61557 1 Range Test voltage Resolution Uncertainty 0 01M 0 19M 100V 1 rdg 12 rdg 7dgt 0 20M 199G 100V 12 rdg 3dgt if nA Voltage Test Rmis 5 20 rdg 3dgt if nA Voltage Test Rmis 5 0 20M 499G 250V 0 20M 999G 500V 0 20M 1 99T 1000V 0 20M 4 99T 2500V 0 20M 9 99T 5000V ...

Страница 30: ...A Voltage Test Rmis 5 20 rdg 3dgt if nA Voltage Test Rmis 5 Load capacitance 1nF 10 1 REFERENCE GUIDELINES Instrument safety IEC EN61010 1 IEC EN61557 1 IEC EN61557 2 Measuring accessory safety IEC EN 61010 031 2002 A1 2008 EMC IEC EN61326 1 Technical documentation IEC EN61187 Insulation double insulation Protection IP40 open case IP53 closed case according to IEC EN60529 Polluting level 2 Measure...

Страница 31: ...es s Refresh rate 1time s Memory Characteristics 700 memory locations Connection to PC Serial interface RS 232 optoinsulated 10 3 ENVIRONMENT 10 3 1 Environmental conditions for use Reference temperature 23 C 5 C 73 41 F Operating temperature 0 C 40 C 32 104 F Allowable relative humidity 80 RH Storage temperature 10 C 60 C 14 140 F Storage humidity 80 RH This instrument complies with the requireme...

Страница 32: ... consequence of improper packaging Repairs which may become necessary as a consequence of interventions performed by unauthorized personnel Modifications to the instrument performed without the manufacturer s explicit authorization 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 manufacture...

Страница 33: ...neral applicable values PI value Insulation conditions from 1 0 to 1 25 Not acceptable from 1 4 to 1 6 Good 1 6 Excellent 12 2 DIELECTRIC ABSORBTION RATIO DAR DAR is ratio of insulation resistance values measured after 30s and after 1 minute The DC test voltage is present during the whole period of the test also an Insulation Resistance measurement is continually running At the end the DAR ratio i...

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