HT COMBITEST422 User Manual
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HT COMBITEST422 User Manual

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© Copyright HT ITALIA 2021
Release EN 1.01 - 06/09/2021

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  • Page 1 © Copyright HT ITALIA 2021 Release EN 1.01 - 06/09/2021...

  • Page 2: Table Of Contents

    COMBITEST422 TABLE OF CONTENTS PRECAUTIONS AND SAFETY MEASURES ............... 4 1.1. Preliminary instructions ....................4 1.2. During use ........................5 1.3. After use .......................... 5 1.4. Definition of measurement (overvoltage) category ............5 GENERAL DESCRIPTION ................... 6 2.1. Instrument functions ......................6 PREPARATION FOR USE ...................
  • Page 3 COMBITEST422 6.7.10. Verification of protection against indirect contacts (TN systems) .......... 69 6.7.11. Anomalous situations ......................71 6.8. LoZ: Line/Loop impedance with high resolution ............. 75 6.9. 1,2,3: Phase sequence and phase concordance test ............. 76 6.9.1. Anomalous situations ......................79 6.10.

  • Page 4: Precautions And Safety Measures

    COMBITEST422 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with guidelines IEC/EN61557, BS7671 17th and 18th editions and IEC/EN61010, relevant to electronic measuring instruments. Before and after carrying out the measurements, carefully observe the following instructions: •...

  • Page 5: During Use

    COMBITEST422 1.2. DURING USE Please carefully read the following recommendations and instructions: CAUTION Failure to comply with the caution notes and/or instructions may damage the instrument and/or its components or be a source of danger for the operator. • Before changing function, disconnect the test leads from the circuit under test.

  • Page 6: General Description

    COMBITEST422 2. GENERAL DESCRIPTION 2.1. INSTRUMENT FUNCTIONS The instrument can perform the following tests: • RPE Continuity test of earth, protective and equipotential conductors with test current higher than 200mA and open-circuit voltage between 4V and 24V. • M Kommenterede [S2]: dato che, più avanti nella frase, si Measurement of insulation resistance with continuous test voltage of specifica DC, “continuous”...

  • Page 7: Preparation For Use

    COMBITEST422 3. PREPARATION FOR USE 3.1. INITIAL CHECKS Before shipping, the instrument has been checked from an electric as well as a mechanical point of view. All possible precautions have been taken so that the instrument is delivered undamaged. However, we recommend checking it to detect any damage possibly suffered during transport.

  • Page 8: Nomenclature

    COMBITEST422 4. NOMENCLATURE 4.1. INSTRUMENT DESCRIPTION CAPTION: 1. Inputs 2. LCD display 3. ,, , , SAVE/ENTER keys 4. Compartment connector optical cable/USB port 5. GO/STOP key 6. HELP/ 7. ESC/MENU key 8. ON/OFF key Fig. 1: Description of the front part of the instrument CAPTION: 1.

  • Page 9: Display Description

    COMBITEST422 ON/OFF key to switch on/off the instrument ESC key to exit the selected menu without confirming MENU key to go back to the general menu at any time     keys to move the cursor through the different screens in order to...

  • Page 10: General Menu

    COMBITEST422 5. GENERAL MENU Pressing the MENU/ESC key in any condition of the instrument allows going back to the general menu in which internal parameters may be set and the desired measuring function may be selected. 15/10 – 18:04 15/10 – 18:04...

  • Page 11: Country

    COMBITEST422 5.1.2. Country Move the cursor to Country by means of the arrow keys 15/10 – 18:04 S E T (,) and confirm with ENTER. Subsequently, the display E u r o p e shows the screen which allows selecting the country of...

  • Page 12: Auto Start Feature

    COMBITEST422 keys (,) and confirm with ENTER. Subsequently, the Auto Power Off :   display shows the screen which allows enabling/disabling the :  OFF  Keys Beep auto power off function, the sound of the function keys and : ...

  • Page 13: Operating Instructions

    COMBITEST422 6. OPERATING INSTRUCTIONS 6.1. AUTO: AUTOMATIC TEST SEQUENCE (RA , RCD, M) This function allows performing the following measurements in an automatic sequence: ➢ Overall earth resistance without causing the RCD’s tripping (Ra ) ➢ Tripping current and tripping time of General RCDs type A (...
  • Page 14 COMBITEST422 TN systems Press the MENU key, move the cursor to AUTO in the 15/10 – 18:04 A U T O >  < main menu by means of the arrow keys (,) and confirm with ENTER. Subsequently the instrument Z L - N = - - - Ω...
  • Page 15 COMBITEST422 Note the correct voltage values between L-N and L-PE as 15/10 – 18:04 A U T O >  < shown in the screen to the side. Z L - N = - - - Ω I s c = - - - A Z L - P E = - - - Ω...
  • Page 16 COMBITEST422 The insulation test starts and the screen to the side 15/10 – 18:04 A U T O >  < appears on the display. The RL-N, RL-PE and RN-PE values appear on the display. > 9 9 9 M ...
  • Page 17 COMBITEST422 TT/IT systems 1. Press the MENU key, move the cursor to AUTO in the 15/10 – 18:04 A U T O >  < main menu by means of the arrow keys (,) and confirm with ENTER. Subsequently, the instrument R A = - - - ...
  • Page 18 COMBITEST422 probe. The instrument will start the automatic test sequence. CAUTION If message “Measuring…” appears on the display, the instrument is performing measurement. During this whole stage, do not disconnect the test leads of the instrument from the mains. 15/10 – 18:04...
  • Page 19 COMBITEST422 In case of a negative result of the Ra test (see § 12.8), 15/10 – 18:04 A U T O >  < the auto test is automatically blocked, the message “NOT OK” is shown and the screen to the side is displayed.

  • Page 20: Anomalous Situations

    COMBITEST422 6.1.1. Anomalous situations 1. If the instrument detects a L-N or L-PE voltage higher 15/10 – 18:04 A U T O than the maximum limit (265V), it does not carry out the Z L - N = - - - Ω...

  • Page 21: Dmm: Digital Multimeter Function

    COMBITEST422 6.2. DMM: DIGITAL MULTIMETER FUNCTION This function allows reading the real time TRMS values of P-N Voltage, P-PE Voltage, N- PE Voltage and Frequency (@ P-N inputs) when the instrument is connected to an installation. Fig. 6: Instrument connection through mains plug Fig.
  • Page 22 COMBITEST422 3. The TRMS values of L-N voltage, L-PE voltage, N-PE 15/10 – 18:04 D M M voltage and the frequency of L-N voltage are shown on the display. FREQ. = 50.00 Press the GO/STOP key to enable/disable the “HOLD”...

  • Page 23: Rpe: Continuity Of Protective Conductors

    COMBITEST422 6.3. RPE: CONTINUITY OF PROTECTIVE CONDUCTORS This function is performed in compliance with standards IEC/EN61557-4, BS7671 17th/18th edition and allows measuring the resistance of protective and equipotential conductors. CAUTION • The instrument can be used for measurements on installations with overvoltage category CAT IV 300V to earth and max 415V between inputs.
  • Page 24 COMBITEST422 Fig. 9: Continuity test by means of remote switch probe Press the MENU key, move the cursor to RPE in the main 15/10 – 18:04 R P E menu by means of the arrow keys (,) and confirm with - - - ...

  • Page 25: Tmr Mode

    COMBITEST422 CAUTION Always make sure, before any test, that the compensation resistance value of the cables is referred to the cables currently used. In case of doubt, repeat the cable calibration procedure as indicated in § 6.3.2. Press the GO/STOP key on the instrument or the START key on the remote switch probe.

  • Page 26: Mode

    COMBITEST422 At the end of the set duration time, the instrument shows 15/10 – 18:04 R P E on the display the maximum value among all the partial 0 . 5 4  measurements performed and the message "OK" in case...

  • Page 27: Anomalous Situations

    COMBITEST422 6.3.3. Anomalous situations In case the detected value is higher than the set limit, the 15/10 – 18:04 R P E instrument gives a long acoustic signal and displays a 4 . 5 4  screen similar to the one reported here to the side.

  • Page 28: Lo: Continuity Of Protective Conductors With 10A

    COMBITEST422 6.4. LO: CONTINUITY OF PROTECTIVE CONDUCTORS WITH 10A This function allows measuring the resistance of protective and equipotential conductors with a test current >10A by using the Lo 10A optional accessory EQUITEST connected to the instrument through the C2050 cable. The optional accessory EQUITEST must be directly powered by the mains on which measurements are performed.

  • Page 29: Anomalous Situations

    COMBITEST422 to the side is shown on the display indicating the E Q U I T E S T S N : 2 0 0 9 0 0 1 1 information relevant to the accessory. F W : 1 . 0 0 H W : 1 .

  • Page 30: M: Measurement Of Insulation Resistance

    COMBITEST422 terminals, it does not perform the test, it emits a prolonged - - -  acoustic signal and displays a screen like the one to the side. I t e s t - - - A V i n > 3 V 0.500 ...
  • Page 31 COMBITEST422 conductors and between each active conductor and the earth. The following operating modes are available: • MAN the test can be carried out between the L-N, L-PE or N-PE conductors and has a fixed duration of 3s when the GO/STOP key is pressed on the instrument (or START on the remote switch probe).
  • Page 32 COMBITEST422 Fig. 13: Insulation between L-N-PE by means of mains plug (MAN and AUTO) Fig. 14: Insulation between L-PE by means of mains plug (TMR mode) Fig. 15: Insulation between L-PE by means of single cables (TMR mode) EN - 32...
  • Page 33 COMBITEST422 Fig. 16: Insulation between L-PE by means of single cables and remote switch probe (TMR mode)) M  15/10 – 18:04 Press the MENU key, move the cursor to M in the main menu by means of the arrow keys (,) and confirm with - - - M ...

  • Page 34: Tmr Mode

    COMBITEST422 • Disconnect any cable not strictly involved in measurement. • Before connecting the test leads, make sure that there is no voltage at the ends of the conductors to be tested. 5. Connect the test leads and remote switch probe to the ends of the conductors to be tested as shown in Fig.

  • Page 35: Auto Mode

    COMBITEST422 "Mode" section. The instrument displays a screen like the - - - M  one shown to the side. Set the duration of the Vt = - - - V T = - - - s measurement in the "Time" section and follow the steps from point 2 to point 5 of §...

  • Page 36: Anomalous Situations

    COMBITEST422 the "Mode" section. The instrument displays a screen like - - - M Vt = - - - V RL-N the one shown to the side. Set the duration of the RL-PE - - - M Vt = - - - V measurement in the "Time"...
  • Page 37 COMBITEST422 emits a long acoustic signal to indicate the negative result 0 . 0 1 M  of the test and displays a screen like the one at the side. NOT OK 500V 1.00M L-PE MODE Vtest Lim. FUNC M ...
  • Page 38 COMBITEST422 terminals, it does not perform the test, emits a prolonged - - - M  acoustic signal and displays a screen like the one at the side. - - - V - - - s Vin >10V 500V 1.00M...

  • Page 39: Rcd: Test On Differential Switches

    COMBITEST422 6.6. RCD: TEST ON DIFFERENTIAL SWITCHES This function is performed in compliance with standard IEC/EN61557-6, BS7671 17th/18th edition and allows measuring the tripping time and current of molded-case differential switches of type A ( ) , AC ( ) or B ( ) being General (G) and Selective (S).
  • Page 40 COMBITEST422 Fig. 17: Connection for single-phase 230V system by means of mains plug Fig. 18: Connection for single-phase 230V system with single cables and remote switch probe Fig. 19: Connection for 400V + N + PE three-phase system by means of single cables and...
  • Page 41 COMBITEST422 Fig. 20: Connection for a 400V + N (no PE) three-phase system by means of single cables and remote switch probe Fig. 21: Connection for a 400V + PE (no N) system with cables and remote switch probe Press the MENU key, move the cursor to RCD in the 15/10 –...

  • Page 42: Auto Mode

    COMBITEST422 3. Insert the green, blue and black connectors of the three-pin plug cable into the corresponding inputs B3, B4 and B1 of the instrument. As an alternative, use the single cables and apply the relevant alligator clips to the free ends of the cables. It is also possible to use the remote switch probe by inserting its multipolar connector into the input B1.

  • Page 43: Auto Mode

    COMBITEST422 7. In case of a positive result (all tripping times comply 15/10 – 18:04 R C D with what indicated in 12.4) of all the test sequentially 0 ° 1 8 0 ° performed, the “OK” message is shown and the screen...

  • Page 44: X1, X5 Modes

    COMBITEST422 7. In case of a positive result (all tripping times comply 15/10 – 18:04 R C D with what indicated in 12.4) of all the tests sequentially 0 ° 1 8 0 ° performed, the “OK” message is shown and the screen to the side is displayed by the instrument.

  • Page 45: Mode

    COMBITEST422 6.6.4. mode The standard defines the tripping times for RCDs at nominal current. The mode is used to detect the tripping time at tripping current (which could also be lower than the nominal current). 15/10 – 18:04 Press the GO/STOP key on the instrument, the START...

  • Page 46: Anomalous Situations

    COMBITEST422 6.6.5. Anomalous situations If the instrument detects a frequency higher than the 15/10 – 18:04 R C D maximum limit (63Hz), it does not carry out the test and - - - displays a screen like the one to the side.
  • Page 47 COMBITEST422 If the instrument detects that the phase L and neutral N 15/10 – 18:04 R C D leads are inverted, it does not carry out the test and a - - - screen similar to the one reported to the side is displayed.
  • Page 48 COMBITEST422 If the instrument detects the absence of the signal to 15/10 – 18:04 R C D terminal B1 (phase conductor), it provides the warning - - - screen shown to the side and blocks the execution of the tests.

  • Page 49: Loop: Line/Loop Impedance And Overall Earth Resistance

    COMBITEST422 6.7. LOOP: LINE/LOOP IMPEDANCE AND OVERALL EARTH RESISTANCE This function is performed in compliance with standard IEC/EN61557-3, BS7671 17th/18th edition and allows measuring the line impedance, the fault loop impedance and the prospective short-circuit current. CAUTION Depending on the selected electrical system (TT, TN or IT), some connections and function modes are disabled by the instruments (see Table 1: Conditions of positive outcome depending on the test parameters).
  • Page 50 COMBITEST422 Fig. 23: P-N/P-PE test for single-phase/two-phase systems with cables and remote probe Fig. 24: P-N/P-PE test for 400V+N+PE three-phase with single cables and remote probe Fig. 25: P-P measurement for 400V+N+PE three-phase systems Fig. 26: P-PE/P-N test for 400V + PE systems by means of single cables and remote probe...
  • Page 51 COMBITEST422 Fig. 27: P-PE measurement for IT systems by means of single cables and remote probe Fig. 28: P-PE 2-wire test for single-phase/two-phase 230V systems with mains plug Fig. 29: P-PE 2-wire test for single-phase/two-phase systems with cables and remote probe Fig.

  • Page 52: Test Types

    COMBITEST422 6.7.1. Test types The protection of electrical lines is the essential part of a project to guarantee correct functionality and avoid injury to persons or damage of property. To this purpose, the safety guidelines impose on electrical designers to also design the electrical installation in order to obtain: 1.
  • Page 53 COMBITEST422 Mode Condition x OK outcome Condition x OK outcome Condition x OK outcome No outcome No outcome No outcome Br.Cap Isc L-L max < BC Isc L-L max < BC Isc L-L max < BC (IscL-Lmin 2F) →Tmax → Tmax <...

  • Page 54: Test Cable Calibration (Zeroloop)

    COMBITEST422 6.7.2. Test cable calibration (ZEROLOOP) In order to obtain better results, it is strongly recommended to perform the preliminary calibration of the test cables or of the cable with mains plug by using the ZEROLOOP accessory before performing the test. In this way, the instrument automatically subtracts the resistance of the test cables, providing the actual result on the display.
  • Page 55 COMBITEST422 The value of the test leads/mains plug resistance is 15/10 – 18:04 L O O P maintained by the instrument up to the reset operation  - - - performed by the user (for example, for the insertion of ...

  • Page 56: Std Mode - Generic Test

    COMBITEST422 6.7.3. STD Mode – Generic test This mode performs the impedance measurement and the calculation of prospective short- circuit current without any evaluation. Therefore, at the end of the test, no outcome is given by the instrument. 15/10 – 18:04...
  • Page 57 COMBITEST422 Press the GO/STOP key on the instrument, the START 15/10 – 18:04 L O O P key on the remote switch probe or use the AutoStart Ipfc - - - feature (see § 5.1.5). The instrument starts the measurement and the “Measuring…” message is shown ...

  • Page 58: Br.cap Mode - Verification Of The Breaking Capacity Of Protection Devices

    COMBITEST422 6.7.4. Br.Cap mode – Verification of the breaking capacity of protection devices Press the MENU key, move the cursor to LOOP in the 15/10 – 18:04 L O O P main menu by means of the arrow keys (,) and - - - confirm with ENTER.
  • Page 59 COMBITEST422 Press the GO/STOP key on the instrument, the START 15/10 – 18:04 L O O P key on the remote switch probe or use the AutoStart - - - feature (see § 5.1.5). The instrument starts the measurement and the “Measuring…” message is shown ...

  • Page 60: Tript - Verification Of Protection Coordination

    COMBITEST422 6.7.5. TripT - Verification of protection coordination Press the MENU key, move the cursor to LOOP in the 15/10 – 18:04 L O O P main menu by means of the arrow keys (,) and - - - confirm with ENTER. Subsequently, the instrument displays a screen similar to the one reported here to the ...
  • Page 61 COMBITEST422 Note the presence of the correct voltage values between 15/10 – 18:04 L O O P L-L and L-PE corresponding to the selections carried out - - - in the initial phase (see § 5.1.3) as shown in the screen to the side.

  • Page 62: Ra 2-Wire Test - Verification Of Protection Against Indirect Contacts

    COMBITEST422 6.7.6. Ra 2-wire test - Verification of protection against indirect contacts Press the MENU key, move the cursor to LOOP in the 15/10 – 18:04 L O O P main menu by means of the arrow keys (,) and - - - confirm with ENTER.
  • Page 63 COMBITEST422 Note the presence of the correct voltage values between 15/10 – 18:04 L O O P L-PE corresponding to the selections carried out in the - - - initial phase (see § 5.1.3) as shown in the screen to the side.

  • Page 64: Ra 3-Wire Test - Verification Of Protection Against Indirect Contacts

    COMBITEST422 6.7.7. Ra 3-wire test - Verification of protection against indirect contacts 1. Press the MENU key, move the cursor to AUTO in the 15/10 – 18:04 L O O P main menu by means of the arrow keys (,) and confirm with ENTER.
  • Page 65 COMBITEST422 shown in the screen to the side. Z L - N = - - - Ω I s c = - - - A Z L - P E = - - - Ω I f c = - - - A F R E Q = 5 0 .

  • Page 66: Verification Of Protection Against Indirect Contacts (It Systems)

    COMBITEST422 6.7.8. Verification of protection against indirect contacts (IT systems) Press the MENU key, move the cursor to LOOP in the 15/10 – 18:04 L O O P main menu by means of the arrow keys (,) and Ipfc - - - confirm with ENTER.

  • Page 67: Verification Of Protection Against Indirect Contacts (Tt Systems)

    COMBITEST422 <50V or <25V), the “OK” message and the screen to the Ipfc side are displayed by the instrument. The screen contains the value of the first fault current measured, expressed in mA (see § 12.9). FREQ. = 50.00Hz VL-N=234V...
  • Page 68 COMBITEST422 main menu by means of the arrow keys (,) and  - - - confirm with ENTER. Subsequently, the instrument displays a screen similar to the one reported here to the - - - side. FREQ. = 0.00Hz Select “Europe” as a country (see § 5.1.2), the options VL-PE=0V “TT”, “25 or 50V”, “50Hz or 60Hz”...

  • Page 69: Verification Of Protection Against Indirect Contacts (Tn Systems)

    COMBITEST422 key on the remote switch probe or use the AutoStart  - - - feature (see § 5.1.5). The instrument starts the measurement and the “Measuring…” message is shown - - - on the display. During this whole stage, do not disconnect the measuring leads of the instrument from the system FREQ.
  • Page 70 COMBITEST422 main menu by means of the arrow keys (,) and - - - confirm with ENTER. Subsequently, the instrument displays a screen similar to the one reported here to the  - - - ZL-PE side.Select “Europe” as a country (see § 5.1.2), the options “TN”, “25 or 50V”, “50Hz or 60Hz”...

  • Page 71: Anomalous Situations

    COMBITEST422 L-N and L-PE corresponding to the selections carried out - - - in the initial phase (see § 5.1.3) as shown in the screen to the side.  - - - ZL-PE FREQ. = 50.00Hz VL-N=231V VL-PE=232V L-PE 0.2s...
  • Page 72 COMBITEST422 maximum limit (63Hz), it does not carry out the test and Ipfc - - - displays a screen like the one to the side.  ZL-PE - - - FREQ. = >63Hz VL-N=0V VL-PE=0V Freq. out of range L-PE...
  • Page 73 COMBITEST422 conductor, it provides the warning screen shown to the Ipfc - - - side and blocks the execution of the tests. Check the PE conductor and earth connection efficiency.  ZL-PE - - - FREQ. = 50.00Hz VL-N= 234V...
  • Page 74 COMBITEST422 leads are inverted, it does not carry out the test and a Ipfc - - - screen similar to the one reported to the side is displayed. Rotate the mains plug or check the connection of  ZL-PE - - - measuring cables.

  • Page 75: Loz: Line/Loop Impedance With High Resolution

    COMBITEST422 6.8. LOZ: LINE/LOOP IMPEDANCE WITH HIGH RESOLUTION This Line/loop impedance measurements with high resolution (0.1m) is performed by using the optional accessory IMP57 connected to the Master unit through the optical cable/RS-232 C2001 supplied with same accessory. The IMP57 must be directly powered by the mains on which measurements are performed.

  • Page 76: 1,2,3: Phase Sequence And Phase Concordance Test

    COMBITEST422 6.9. 1,2,3: PHASE SEQUENCE AND PHASE CONCORDANCE TEST This function allows testing the phase sequence and concordance with 1-wire method by direct contact with live parts (not on cables with insulating sheath). Fig. 31: Phase sequence check with test leads Fig.
  • Page 77 COMBITEST422 Press the GO/STOP key on the instrument or the START 15/10 – 18:04 1 2 3 key on the remote switch probe. The instrument will start the test. - - - The "Touch L1" message is shown on the display to...
  • Page 78 COMBITEST422 At the end of the test, if the detected phase sequence is 15/10 – 18:04 1 2 3 incorrect, the instrument displays a screen like the one shown to the side (result "213") and the “NOT OK” message. 2 1 3...

  • Page 79: Anomalous Situations

    COMBITEST422 6.9.1. Anomalous situations If the instrument detects an input voltage frequency 15/10 – 18:04 1 2 3 exceeding the allowed full scale, it will display a screen like the one to the side. - - - Freq. out of range...

  • Page 80: V%: Voltage Drop Of Mains

    COMBITEST422 6.10. V%: VOLTAGE DROP OF MAINS Kommenterede [S20]: forse MAINS nel senso di rete elettrica? This feature allows evaluating the percentage value of voltage drop between two points of mains in which a protection device is installed and comparing this value to possible limit Kommenterede [S21]: idem come commentato sopra? values specified by guidelines.
  • Page 81 COMBITEST422 Press the MENU key, move the cursor to V% in the  V % 15/10 – 18:04 main menu by means of the arrow keys (,) and V% - - - confirm with ENTER. Subsequently, the instrument displays a screen similar to the one reported here to the ...
  • Page 82 COMBITEST422 Use the ,  keys and move the cursor to the “Z><”  V % 15/10 – 18:04 position. Press the GO/STOP key on the instrument to V% - - - start the test. The result of the Z1(offset ) measurement is shown on the display above the “Z><”...

  • Page 83: Anomalous Situations

    COMBITEST422 6.10.1. Anomalous situations  V % If the instrument detects a frequency higher than the 15/10 – 18:04 maximum limit (63Hz), it does not carry out the test and V% - - - displays a screen like the one to the side.
  • Page 84 COMBITEST422  V % If the instrument detects a dangerous voltage on PE 15/10 – 18:04 conductor, it provides the warning screen shown to the V% - - - side and blocks the execution of the tests. Check the PE conductor and earth connection efficiency.
  • Page 85 COMBITEST422  V % If the instrument detects that the phase L and neutral N 15/10 – 18:04 leads are inverted, it does not carry out the test and a V% - - - screen similar to the one reported to the side is displayed.

  • Page 86: Storing Results

    COMBITEST422 7. STORING RESULTS The instrument allows saving max 999 measured values. The saved data can be recalled to the display and deleted at any moment, and, upon saving, they can be associated with up to a maximum of 3 levels of numeric markers relevant to the installation name, the PV string and the PV module (with max value 250).

  • Page 87: Recall Of Data To Display And Memory Deletion

    COMBITEST422 7.2. RECALL OF DATA TO DISPLAY AND MEMORY DELETION 15/10 – 18:04 1. Position the cursor onto MEM by using the arrow keys D a t e T y p e (,) and confirm with ENTER. The screen to the side...

  • Page 88: Connecting The Instrument To The Pc

    COMBITEST422 8. CONNECTING THE INSTRUMENT TO THE PC CAUTION • The connection between instrument and PC is realized by means of cable C2006. • In order to transfer the data onto a PC, it is necessary to install beforehand both the management software and the drivers of cable C2006 on the PC itself.

  • Page 89: Maintenance

    COMBITEST422 9. MAINTENANCE 9.1. GENERAL INFORMATION ➢ While using and storing the instrument, carefully observe the recommendations listed in this manual in order to prevent possible damage or danger during use. ➢ Do not use the instrument in environments with high humidity levels or high temperatures.

  • Page 90: Technical Specifications

    COMBITEST422 10. TECHNICAL SPECIFICATIONS Accuracy is calculated as: ±[%reading + (no. of digits) * resolution] at 23°C, <80%RH 10.1. TECHNICAL CHARACTERISTICS AC TRMS voltage Range [V] Resolution [V] Accuracy 15  460 (3%rdg + 2dgt) Frequency Range [Hz] Resolution [Hz] Accuracy 47.50 ...
  • Page 91 COMBITEST422 Differential protection type (RCD): AC ( ), A ( ),General (G), Selective (S) and B( 100V 265V RCD type A, A and B (IN ≤100mA) Voltage range P-PE, P-N: 190V 265V RCD type B (IN = 300mA) Voltage range N-PE : <10V...

  • Page 92: Reference Guidelines

    COMBITEST422 100V  265V Voltage range P-PE, P-N: Voltage range N-PE: <10V 50/60Hz  5% Frequency: Overall earth resistance in systems with Neutral (3-wire) – (30mA or higher RCD) Accuracy Range [] Resolution [] 0.05  9.99 0.01 (5rdg +8dgt) 10.0 ...

  • Page 93: General Characteristics

    COMBITEST422 EMC: IEC/EN61010-2-034, IEC/EN61557-1 Technical documentation: IEC/EN61187 Safety of accessories: IEC/EN61010-031 Insulation: double insulation Pollution level: Measurement category: CAT IV 300V to earth, maximum 415V between inputs RPE: IEC/EN61557-4,BS7671 17th/18th ed., AS/NZS3000/3017 M: IEC/EN61557-2,BS7671 17th/18th ed., AS/NZS3000/3017 RCD: IEC/EN61557-6 (only on Phase-Neutral-Earth systems) LOOP P-P, P-N, P-PE: IEC/EN61557-3,BS7671 17th/18th ed., AS/NZS3000/3017...

  • Page 94: Service

    COMBITEST422 11. SERVICE 11.1. WARRANTY CONDITIONS This instrument is warranted against any material or manufacturing defect, in compliance 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.

  • Page 95: Theoretical

    COMBITEST422 12. THEORETICAL APPENDIXES 12.1. CONTINUITY OF PROTECTIVE CONDUCTORS Check the continuity of: • Protective conductors (PE), main equalizing potential conductors (EQP), secondary equalizing potential conductors (EQS) in TT and TN-S systems • Neutral conductors having functions of protective conductors (PEN) in TN-C systems.

  • Page 96: Measurement Of Polarization Index (Pi)

    COMBITEST422 Check that the insulation resistance of the installation complies with the requirements of the applicable guidelines. This test has to be performed with the circuit being tested not powered and with the possible loads it supplies disconnected. Allowable values The values of the measured voltage and of the minimum insulation resistance can be taken from the following table.

  • Page 97: Dielectric Absorption Ratio (Dar)

    COMBITEST422 polarization. Because of the polarized molecules, a polarization (absorption) current generates, which lowers the total value of insulation resistance. Parameter PI consists in the ratio between the value of insulation resistance measured after 1 minute and after 10 minutes. The test voltage is maintained throughout the whole...
  • Page 98 COMBITEST422 (double or reinforced insulation or earthed metal screen) and absence of earthed points (insulated from the earth). A PELV system is a zero-category system or protective extra low voltage system characterized by power supply from an independent (e.g. batteries, small generator set) or safety source (e.g.
  • Page 99 COMBITEST422 EXAMPLE OF SEPARATION TEST BETWEEN ELECTRICAL CIRCUITS Insulation or safety transformer separating the circuits TEST BETWEEN ACTIVE PARTS Connect an instrument probe to one of the two conductors of the separated circuit and the other to one of the conductors of a non- separated circuit.

  • Page 100: Test On Differential Switches (Rcd)

    COMBITEST422 12.4. TEST ON DIFFERENTIAL SWITCHES (RCD) Purpose of the test Checking that the General (G) and Selective (S) differential protection devices have been correctly installed and adjusted and that they maintain their characteristics over time. The check must make sure that the differential switch trips at a current not higher than its...

  • Page 101: Verification Of The Breaking Capacity Of Protection Devices

    COMBITEST422 Measurement of tripping current for protection differential switches ➢ This test aims at checking the real tripping current of general differential switches (it does not apply to selective differential switches). ➢ In the presence of differential switches with selectable tripping current, it is useful to perform this test in order to check the real tripping current of the differential switch.

  • Page 102: Verify Of Protection Against Indirect Contacts In Tn Systems

    COMBITEST422 12.6. VERIFY OF PROTECTION AGAINST INDIRECT CONTACTS IN TN SYSTEMS Purpose of the test Protection against indirect contacts in TN systems must be guaranteed by means of a protection device against overcurrents (typically MCB or fuse), which switches off the...
  • Page 103 COMBITEST422 Depending on the set values of phase-phase, phase-neutral or phase-PE voltage (see § 5.1.3) and the measured value of fault loop impedance, the instrument calculates the minimum value of the prospective short-circuit current to be interrupted by the protection device.

  • Page 104: Ra Test In Tn Systems

    COMBITEST422 12.7. RA TEST IN TN SYSTEMS Protection against indirect contacts in TN systems must be guaranteed by means of a protection device against overcurrents (typically MCB or fuse) which switches off the power supply of the circuit or the electrical equipment in case of faults between an active part and a ground mass or a protection conductor within a interval not exceeding 5s, sufficient for the equipments.

  • Page 105: Verify Of Protection Against Indirect Contacts In Tt Systems

    COMBITEST422 12.8. VERIFY OF PROTECTION AGAINST INDIRECT CONTACTS IN TT SYSTEMS Purpose of the test Checking that the protection device is coordinated with the value of earth resistance. We cannot assume a priori a reference limit value for earth resistance when checking the measurement’s result.

  • Page 106: Verify Of Protection Against Indirect Contacts In It Systems

    COMBITEST422 12.9. VERIFY OF PROTECTION AGAINST INDIRECT CONTACTS IN IT SYSTEMS In IT systems, the active parts must be isolated from the ground or be connected to earth through an impedance of sufficiently high value. In case of a single earth fault, the first fault current is weak, and therefore it is not necessary to interrupt the circuit.

  • Page 107: Verify Of Protection Coordination L-L, L-N And L-Pe

    COMBITEST422 12.10. VERIFY OF PROTECTION COORDINATION L-L, L-N AND L-PE Purpose of the test Testing the coordination of protective devices (typically MCB or fuse) present in a single- phase or three-phase installation as a function of the limit time of fault extinction by the protection set by the user and the calculated value of the short-circuit current.

  • Page 108: Verifiy Of Voltage Drop On Mains

    COMBITEST422 CAUTION The instrument must be used to measure fault loop impedance values at least 10 times higher than the resolution value of the instrument in order to minimize errors. Depending on the set values of nominal voltage (see § 5.1.3) and the measured value of fault loop impedance, the instrument calculates the minimum value of the prospective short-circuit current to be interrupted by the protection device.
  • Page 109 COMBITEST422 ➢ Verify the capability of an existing mains line to supply a load ➢ Dimension a new installation ➢ Search for possible causes of troubles on devices, loads, etc. connected to mains Purpose of the test Measure the maximum percentage value of voltage drop between two points of mains.
  • Page 111 Fax: +55 19 9979.11325 eMail: info@htinstruments.es eMail: ht@htitalia.it eMail: vendas@ht-instruments.com.br Web: www.htinstruments.es Web: www.ht-instruments.com Web: www.ht-instruments.com.br HT INSTRUMENTS USA LLC HT INSTRUMENTS GMBH HT ITALIA CHINA OFFICE 3145 Bordentown Avenue W3 Am Waldfriedhof 1b 意大利 HT 中国办事处 08859 Parlin - NJ - USA...

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