HT Italia HT7052 User Manual
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HT Italia HT7052 User Manual

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ENGLISH
User manual
 Copyright HT ITALIA 2013
Release EN 2.00 - 02/01/2013

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Summary of Contents for HT Italia HT7052

  • Page 1 ENGLISH User manual  Copyright HT ITALIA 2013 Release EN 2.00 - 02/01/2013...

  • Page 3: Table Of Contents

    HT7052 Table of Content: 1  PRECAUTIONS AND SAFETY MEASURES ................2      Preliminary instructions ........................2     During use ............................3     After use ............................... 3     Definition of measurement (overvoltage) category ................3 2  GENERAL DESCRIPTION ......................4 ...

  • Page 4: 1  Precautions And Safety Measures

    HT7052 1 PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with standards IEC/EN61557-1 and IEC/EN61010-1 regarding electronic measuring instruments CAUTION For the operator’s safety and to prevent damaging the instrument, follow the procedures described in this manual and carefully read all notes preceded by...

  • Page 5: During Use

    HT7052 1.2 DURING USE Carefully read the following recommendations and instructions: CAUTION Failure to observe the warnings and/or instructions may damage the instrument and/or its components or generate a danger for the operator. If, during use, the low battery symbol appears on the display, insert the supply cable into the Europlug socket to start battery recharge.

  • Page 6: 2  General Description

    HT7052 2 GENERAL DESCRIPTION The instrument HT7052 You purchased, if used in compliance with the indications given in this manual, guarantees accurate and reliable measurements and the utmost safety thanks to a development of new conception which ensures double insulation and, consequently, compliance with the requirements of overvoltage category IV 2.1 INSTRUMENT FEATURES...

  • Page 7: 3  Preparation For Use

    HT7052 3 PREPARATION FOR USE 3.1 INITIAL INSPECTIONS Before shipment, the instrument’s electronics and mechanics have been inspected. All possible precautions have been taken in order for the instrument to be delivered without damage However, we recommend generally inspecting the instrument in order to detect any damage suffered during transport.

  • Page 8: 4  Description Of Parts

    HT7052 4 DESCRIPTION OF PARTS 4.1 INSTRUMENT DESCRIPTION Fig. 1: Instrument description LEGEND: ON/OFF key to switch the instrument ON or OFF START/STOP key to start or stop any measurement , , , arrow keys to select parameters and set values...

  • Page 9: Description Of Test Leads

    HT7052 4.2 DESCRIPTION OF TEST LEADS Test lead 1 This test lead is designed for hand held testing of insulation resistance Features  Shielded cable in order to increase the immunity to external disturb and improve the accuracy of measurements ...

  • Page 10: 5  Initial Operations

    HT7052 5 INITIAL OPERATIONS 5.1 SWITCHING ON THE INSTRUMENT 5.1.1 Mains powered instrument operation CAUTION  If you connect instrument to the mains supply when instrument is turned OFF, internal charger will begin to charge the batteries but instrument will remain turned OFF.

  • Page 11: Configuration And Setup Of Systems Parameters

    HT7052 Auto-calibration prevents the reduction in accuracy when measuring very low currents. It compensates the effects caused by ageing, temperature and humidity changes etc. A new auto-calibration is recommended when the temperature changes by more than 5C. If the instrument detects an incorrect state during the autocalibration, the following warning...

  • Page 12: 6  How To Perform The Measurements

    HT7052 6 HOW TO PERFORM THE MEASUREMENTS 6.1 THEORY OF INSULATION RESISTANCE MEASUREMENT The purpose of insulation tests Insulating materials are important parts of almost every electrical product. The material’s properties depend not only on its compound characteristics but also on temperature, pollution, moisture, ageing, electrical and mechanical stress, etc.
  • Page 13 HT7052 = surface resistivity (position of optional guard connection) iss1 iss2 = the actual insulation resistance of material = capacitance of material = represents polarization effects The Fig. 8 shows typical currents for that circuit, where: = overall test current (I...

  • Page 14: Time Dependence Test - Diagnostic Test

    HT7052 6.1.1 Time dependence test – Diagnostic test Diagnostic test is a long duration test for evaluating the quality of the insulation material under test. The results of this test enable the decision to be made on the preventive replacement of the insulation material DIELECTRIC ABSORPTION RATIO (DAR) DAR is ratio of Insulation Resistance values measured after 15s and after 1 minute.
  • Page 15 HT7052 POLARIZATION INDEX (PI) PI is the ratio of Insulation Resistance values measured after 1 minute and after 10 minutes. The DC test voltage is present during the whole period of the measurement (an Insulation Resistance measurement is also running). On completion of the test the PI ratio is displayed: ...
  • Page 16 HT7052 DIELECTRIC DISCHARGE RATIO (DD) An additional effect of polarization is the recovered charge (from Cpi) after the regular discharging of a completed test. This can also be a supplementary measurement for evaluation of the quality of insulating material. This effect is generally found in insulating systems with large capacitance Ciso.

  • Page 17: Withstanding Voltage Test

    HT7052 6.1.2 Withstanding voltage test Some standards allow the use of a DC voltage as an alternative to AC withstanding voltage testing. For this purpose the test voltage has to be present across the insulation under test for a specific time. The insulation material only passes if there is no breakdown or flash over.

  • Page 18: Guard Terminal

    HT7052 6.2 GUARD TERMINAL The purpose of the GUARD terminal is to lead away potential leakage currents (e.g. surface currents), which are not a result of the measured insulation material itself but are a result of the surface contamination and moisture. This current interferes with the measurement i.e.

  • Page 19: Use Of Internal Filters

    HT7052 6.3 USE OF INTERNAL FILTERS Filters are built in to reduce the influence of noise on measurement results. This option enables more stable results especially when dealing with high Insulation Resistances (Insulation Resistance, Diagnostic Test, Step Voltage). In these functions, the status of the filter option is shown in the top right corner of the LCD screen.

  • Page 20: Voltage Measurement

    HT7052 6.4 VOLTAGE MEASUREMENT CAUTION Maximum input for DC or AC voltage is 600V. Do not attempt to take any voltage measurement that exceeds the limits. Exceeding the limits could cause electrical shock and damage the instrument 1. Switch on the instrument by pressing the ON/OFF key 2.

  • Page 21: Insulation Resistance Measurement

    HT7052 6.5 INSULATION RESISTANCE MEASUREMENT 6.5.1 Setting of parameters 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “INSULATION RESISTANCE” on main menu and confirm with SELECT key. The screen of Fig. 16 is shown by the meter. In case of activation of Graphic R(t) option press arrow keys ...

  • Page 22: Perform The Measurement

    HT7052 Fig. 18: Setting parameters Fig. 19: Setting of graph R(t) parameters 6.5.2 Perform the measurement 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “INSULATION RESISTANCE” on main menu and confirm with SELECT key.
  • Page 23 HT7052 Fig. 24: Connection of instrument for insulation measurement 5. Press START/STOP key to activate the measurement in continuous mode 6. Wait for a stable result at display and press again START/STOP key to stop the measurement or wait for the end of the set Timer. The result of test is shown at display (see Fig.

  • Page 24: Diagnostic Test

    HT7052 6.6 DIAGNOSTIC TEST 6.6.1 Setting of parameters 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “DIAGNOSTIC TEST” on main menu and confirm with SELECT key. The screen of Fig. 25 is shown by the meter. In case of activation of Graphic R(t) option press arrow keys ...

  • Page 25: Perform The Measurement

    HT7052 Fig. 27: Setting parameters Fig. 28: Setting of graph R(t) parameters 6.6.2 Perform the measurement 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “DIAGNOSTIC TEST” on main menu and confirm with SELECT key.
  • Page 26 HT7052 Fig. 33: Connection of instrument for diagnostic test 5. Press START/STOP key to activate the insulation measurement 6. Wait for the end of the set Timers. The result of test is shown at display (see Fig. 30 or Fig. 32) with meaning of items descript in Table 6 7.

  • Page 27: Insulation Resistance With Step Voltage Test

    HT7052 6.7 INSULATION RESISTANCE WITH STEP VOLTAGE TEST 6.7.1 Setting of parameters 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “STEP VOLTAGE” on main menu and confirm with SELECT key. The screen of Fig. 34 is shown by the meter. In case of activation of Graphic R(t) option press arrow keys ...

  • Page 28: Perform The Measurement

    HT7052 6.7.2 Perform the measurement 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “STEP VOLTAGE” on main menu and confirm with SELECT key. The screen of Fig. 38 is shown by the meter. In case of activation of Graphic R(t) option press arrow keys ...
  • Page 29 HT7052 5. Press START/STOP key to activate the insulation measurement 6. Wait for the end of the set Timers. The result of test is shown at display (see Fig. 39 or Fig. 41) with meaning of items descript in Table 8 7.

  • Page 30: Withstanding Voltage Test

    HT7052 6.8 WITHSTANDING VOLTAGE TEST 6.8.1 Setting of parameters 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “WITHSTANDING VOLTAGE DC” on main menu and confirm with SELECT key. The screen of Fig. 43 is shown by the meter Fig.

  • Page 31: Perform The Measurement

    HT7052 6.8.2 Perform the measurement 1. Switch on the instrument by pressing the ON/OFF key 2. Select with arrow keys  or  the item “WITHSTANDING VOLTAGE DC” on main menu and confirm with SELECT key. The screen of Fig. 43 is shown by the meter 3.

  • Page 32: 7  Management Of Memory Data

    HT7052 7 MANAGEMENT OF MEMORY DATA 7.1 SAVING, RECALL AND CLEAR MEASUREMENT RESULTS SAVING DATA 1. With measurement result displayed press MEM key. The screen of Fig. 47 is shown by the instrument SAVE nnnn Fig. 47: Saving data 2. Use the arrow keys  or  and select the “MEM” option. The “nnnn” number shows the memory location where the data will be saved 3.

  • Page 33: 8  Connection Of The Instrument To Pc

    HT7052 8 CONNECTION OF THE INSTRUMENT TO PC The saved data can be transferred to PC by using the TeraView dedicated software included with instrument TeraView software permits the herewith operations:  Download data from meter  Define customized settings on the final report ...
  • Page 34 HT7052 8. Select the “Config  COM Port…” command and click on the “AutoFind” button to start the automatic detection of the instrument (see Fig. 49) Fig. 49: Connection of the instrument to PC 9. The herewith message means a correct detection of meter by the PC Fig.

  • Page 35: 9  Maintenance

    HT7052 9 MAINTENANCE 9.1 GENERAL INFORMATION The instrument You purchased is a precision instrument. During use and storage, carefully observe the recommendations listed in this manual in order to prevent possible damage or dangers during use. Do not use the instrument in environments with high humidity levels or at high temperatures.

  • Page 36: 10 Technical Specifications

    HT7052 10 TECHNICAL SPECIFICATIONS Accuracy is given as [%rdg + (number of dgt) * resolution] at reference indicated in § 0 INSULATION RESISTANCE MEASUREMENT Measurement range Resolution Accuracy 120k  999k 1k 1.00M  9.99M 0.01M 10.0M  99.9M 0.1M...

  • Page 37: Safety Standards

    HT7052 DAR, PI, DD MEASUREMENT Measurement range Resolution Accuracy 0.01  9.99 (5.0 rdg + 2 dgt) 0.01 10.0  100.0 5.0 dgt 5nF  50F Capacitance range for DD test: INSULATION MEASUREMENT WITH STEP VOLTAGE Measurement range test voltage...

  • Page 38: General Characteristics

    HT7052 10.2 GENERAL CHARACTERISTICS Mechanical characteristics Dimensions (LxWxH): 360 x 330 x 160mm; 14 x 13 x 6in Weight (with batteries): 5.5kg; 11lv Power supply External supply: 90-260V AC, 45-65Hz, 60VA Internal supply: 6x1.2V rechargeable NiMH battery IEC LR20 Low battery indication: symbol “...

  • Page 39: 11 Service

    HT7052 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 Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer's charge.

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