HT HT155 User Manual
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HT HT155 User Manual

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 Copyright HT ITALIA 2011
Release EN 1.02 - 28/12/2011

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Summary of Contents for HT HT155

  • Page 1  Copyright HT ITALIA 2011 Release EN 1.02 - 28/12/2011...

  • Page 3: Table Of Contents

    HT155 - HT157 Table of contents: 1. PRECAUTIONS AND SAFETY MEASURES ..............3 1.1. Preliminary instructions ....................3 1.2. During use ........................3 1.3. After use ........................... 3 2. GENERAL DESCRIPTION ....................4 3. PREPARATION FOR USE ....................5 3.1. Initial inspections ......................5 3.2.
  • Page 4 HT155 - HT157 8.1. Foreword ........................49 8.2. Minimum system requirements ..................49 8.3. Installing the driver USB ....................49 8.4. Use of SoundView software ................... 51 8.4.1. Copy and Print commands ..................51 8.4.2. File menu ........................52 8.4.3. View menu ........................53 8.4.4.

  • Page 5: Precautions And Safety Measures

    HT155 - HT157 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with the directives regarding electronic measuring instruments. For your safety and to prevent damaging the instrument, we recommend following the procedures described in this manual and carefully reading all...

  • Page 6: General Description

    HT155 - HT157 2. GENERAL DESCRIPTION This manual refers to models HT155 and HT157. In the manual, the generic term “instrument” refers to both devices and, if not otherwise indicated, characteristics are to be considered as common to both models The instrument has the following functions: ...

  • Page 7: Preparation For Use

    HT155 - HT157 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: Operating Instructions

    HT155 - HT157 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. FRONT PANEL LEGEND: 1. Microphone 2. ON key 3. OFF key 4. CANCEL key 5. Key to turn on the backlight 6. LCD display 7. ENTER key 8. EXIT key 9.

  • Page 9: Description Of Function Keys

    HT155 - HT157 4.2. DESCRIPTION OF FUNCTION KEYS Description Pressing the ON key allows turning on and internally resetting the instrument at any time The OFF key allows turning off the instrument The CANCEL key allows deleting the saved data from the instrument’s memory...

  • Page 10: Display Contrast Adjustment

    HT155 - HT157 4.4. DISPLAY CONTRAST ADJUSTMENT The instrument allows adjusting the display contract, proceeding as follows: 1. Turn on the instrument by pressing the key. The display shows the following screen: Fig. 4: Display contrast adjustment 2. Within 5s, press the arrow keys “...

  • Page 11: Configuration Of Measuring Parameters

    HT155 - HT157 4.6. CONFIGURATION OF MEASURING PARAMETERS 4.6.1. FOREWORD Before activating a recording operation, it is necessary to set the necessary parameters such as the measure name, the measuring time, etc., on the instrument, starting from section “Setup” of the main menu (see Fig. 5) or pressing the “ ” key inside a measuring section.
  • Page 12 HT155 - HT157 On the left side of the line there is the voltage battery and on the right side the back-up battery voltage. In case the voltage value is > 10V, the Line 1 message “Over” will appear on the display...

  • Page 13: Defining The Measure Name

    HT155 - HT157 4.6.3. DEFINING THE MEASURE NAME By selecting Line 3 inside the programming menu (see Fig. 6) and pressing the “ ” key, the instrument displays the following screen, which shows a list of the measure names created by the user: Fig.
  • Page 14 HT155 - HT157 2. Press “ ” again to enter the next screen, where it is possible to digit the measure name by using the “ ”, “ ”, “ ” and “ ” keys, for the selection of the available characters, and the “...

  • Page 15: Carrying Out Measurements

    HT155 - HT157 5. CARRYING OUT MEASUREMENTS The instrument is capable of carrying out different types of analyses of the sound pressure level of a noise source: 1. Statistic analysis of noise 2. Spectrum analysis of noise with octave-band filter (1/1) (HT157 only) 3.

  • Page 16: Statistic Analysis Operations

    HT155 - HT157 5.1.2. STATISTIC ANALYSIS OPERATIONS 1. Select the “Statistic” icon and confirm with “ ”. The instrument shows the following screen relevant to the numerical display of the measured quantities  Line 1  Lines 2,8  Line 9 Fig.
  • Page 17 HT155 - HT157 This line contains:  The “ ” icon, which indicates the battery charge level  The “ ” icon, which indicates the measuring mode. In the same position, the following messages can be displayed: “OVER” and “UNDER”, to indicate that the measured values are respectively higher and lower than the maximum and minimum range set.
  • Page 18 HT155 - HT157 Fig. 13: Graphic screen of statistic analysis 8. The screen shows the diagram of the statistic distribution corresponding to the recording in progress, with update every second. The left part of the graphic displays the statistic percentage of the sound pressure level corresponding to the dB value measured by the instrument, which can be changed by means of the “...

  • Page 19: 24-Hour Analysis Operations

    HT155 - HT157 5.1.3. 24-HOUR ANALYSIS OPERATIONS The “24Hours” analysis is a statistic analysis, but has a fixed duration of 24 hours starting from the programmable date/time, and divides the measuring results of the various quantities in 24 intervals of one hour each. After the analysis has automatically stopped, the calculated values of Ld, Ln and Ldn noise are also provided.
  • Page 20 HT155 - HT157 The left part shows the current date/time set on the instrument, while the right part shows the measuring range currently used by the instrument. Both the parameters can be programmed by the user as follows:  Date/time setting 1.
  • Page 21 HT155 - HT157 5. Press the “ ” key to start measuring. After this operation, the instrument:  Starts measuring from the minute indicated in the system date/time and shows this reference in column “hh:mm” with the relevant values of the quantities read in real time ...
  • Page 22 HT155 - HT157 The left part shows the current date/time set on the instrument, while the right part shows the measuring range currently used by the instrument. Initial line Both parameters can be programmed, as with numerical display  By using the “ ” or “ ” keys to move the flashing cursor to the “hh:mm”...

  • Page 23: Integration Analysis Operations

    HT155 - HT157 5.1.4. INTEGRATION ANALYSIS OPERATIONS In this type of analysis, the instrument carries out an instant measurement, measures integrated values and peak “C” values of the sound pressure level in the three frequency weightings (A, C, Z) and in the three time constants (Slow, Fast, Impulse) 1.
  • Page 24 HT155 - HT157 These lines show in real time the instant values of the following quantities, measured by the instrument: LAFp, LCFp, LZFp, LASp, LCSp, LZSp, LAIp, LCIp, LZIp, LAeq1s, LCeq1s, LZeq1s Lines 2- 7 corresponding to the impulse levels of sound pressure with weightings A,...
  • Page 25 HT155 - HT157  Line 1  Lines 2-7  Line 8  Line 9 Fig. 21: Screen of integrated values of Integral analysis It allows setting the current date/time and the measuring range in the Line 1 same way as for the instant value display...

  • Page 26: Noise Analysis In 1/1 And 1/3 Octave Band (Ht157 Only)

    HT155 - HT157 5.2. NOISE ANALYSIS IN 1/1 AND 1/3 OCTAVE BAND (HT157 ONLY) Further to the statistic analysis, the instrument HT157 allows carrying out accurate measurements of the noise spectrum by using internal octave-band (1/1) and third-octave- band (1/3) filters 5.2.1.

  • Page 27: Octave Band Analysis (1/1)

    HT155 - HT157 5.2.2. OCTAVE BAND ANALYSIS (1/1) 5.2.2.1. Operations for sections LIST, GRAPH and TOTAL 2. Select the “List” icon and confirm with “ ”. The instrument displays the following numerical screen:  Line 1  Lines 2,8  Line 9 Fig.
  • Page 28 HT155 - HT157 3. Press the “ ” key to start recording the values of the spectrum analysis 1/1 with a duration equal to the total measuring time (Tm) defined in the programming menu (see § 4.6). In this condition, the indication of the measuring range disappears and the measuring time appears, and cannot be changed while recording, and the “Leq,T”...
  • Page 29 HT155 - HT157 Fig. 25: Graphic screen of 1/1 spectrum analysis 9. The screen shows the histogram of the sound pressure level associated to the frequency spectrum whose center is reported on the x-axis, further to the indications of the frequency weightings A, C, and Z. The minimum and maximum values on the y-axis are determined by the measuring range selection 10.
  • Page 30 HT155 - HT157 CAUTION The “Max” and “Lock” functions are not active for instant values shown in the graphic bar 4. With flashing cursor on the “Linst” item, select the “Leq1s” options with the “ ” or “ ” keys. The instrument shows the following screen relevant to the values of the noise level equivalent to 1s: Fig.
  • Page 31 HT155 - HT157 21. When pressing the “ ” key with paused instrument, measurement is stopped and the result is saved in the internal memory 22. When pressing the “ ” key with paused instrument, the measurement being carried out is cancelled and the instrument waits for a new recording CAUTION ...

  • Page 32: Analysis In Third-Octave Band (1/3)

    HT155 - HT157 5.2.3. ANALYSIS IN THIRD-OCTAVE BAND (1/3) 5.2.3.1. Operations for sections LIST, GRAPH 1. Select the “List” icon and confirm with “ ”. The instrument displays the following numerical screen:  Line 1  Line 2  Lines 3,8 ...
  • Page 33 HT155 - HT157 This line contains:  The “ ” icon, which indicates the battery charge level  The “ ” icon which indicated the 1/3 measuring mode. In the same position, the following messages can be displayed: “OVER” and “UNDER”, to indicate that the measured values are respectively higher...
  • Page 34 HT155 - HT157  With cursor flashing on the “ ” icon, press the “ ” or “ ” keys to select the “Lock” option. Subsequently, press the “ ” key to lock the quantity data values shown on the display. Press “...

  • Page 35: Operations In Total Section

    HT155 - HT157 5.2.3.2. Operations in TOTAL section 1. Select the “Total” item in the main menu (see Fig. 22) and confirm with “ ”. The instrument displays the following screen, relevant to the “Linst” item: Fig. 32: Total section screen 1/3 spectrum analysis – Instant values 2.
  • Page 36 HT155 - HT157 5. Use the “Save” functions to save the screen on the display and the options “Lock” and “Max” respectively to block the values on the display and show the maximum value of the quantities 6. With flashing cursor on the “Linst” item, select the “Leq,T” options with the “...

  • Page 37: Instrument Acoustic Calibration

    HT155 - HT157 6. INSTRUMENT ACOUSTIC CALIBRATION 6.1.1. FOREWORD The instrument is regularly calibrated upon purchase and upon first use. The acoustic calibration of the sensitivity level of the microphone is recommended in order to always carry out correct tests at the beginning of each measuring campaign and must be carried out by using the provided portable calibrator in Class 1 HT151, with an operating frequency of 1kHz ...
  • Page 38 HT155 - HT157 This line indicated the sound pressure level set on the portable calibrator Line 4 HT151 during the calibration operation (see § 6.1.3) This line shows the results of the calibration operation. When the Line 5 instrument is calibrated by means of frequency weighting type C, “Lpx=”...

  • Page 39: Acoustic Calibration With Calibrator Ht151

    HT155 - HT157 6.1.3. ACOUSTIC CALIBRATION WITH CALIBRATOR HT151 CAUTION  For the first acoustic calibration of the instrument’s microphone, set the sound pressure level (SPL) according to the values allowed by the portable calibrator HT151 (94.0dB and 114.0dB). For values different from these reference values, program the instrument as described in §...

  • Page 40: Replacing The Calibrator Battery

    HT155 - HT157 5. Press and hold the “ON” key on the calibrator HT151 to activate the level equal to 94.0dB, looking at the activation of the red LED on the calibrator. Press and hold both “ON” and “+20dB” keys to activate the level equal to 114.0dB. Preliminarily check the emission of the output sound of the calibrator.

  • Page 41: Calibration Result Display

    HT155 - HT157 6.1.3.2. Calibration result display The instrument allows saving up to 256 calibration operations. For subsequent operations, the memory space is automatically reset and only the last operation carried out is saved. To recall the operation on the display, proceed as follows: 1.

  • Page 42: Operations With The Memory

    HT155 - HT157 7. OPERATIONS WITH THE MEMORY The instrument is provided with an internal Flash memory with a capacity of 64Kbytes for saving data. Each saved measure can have a maximum size of up to 512 bytes, and therefore it is possible to save up to 128 measure groups. The saved data can be transferred onto the provided USB pen or transferred to the PC via USB connection and analyzed with the provided software.

  • Page 43: Recalling The Statistic Analysis Data On The Display

    HT155 - HT157 7.1.1. RECALLING THE STATISTIC ANALYSIS DATA ON THE DISPLAY 1. Select a datum corresponding to the “STA” indication available in the list of saved measures and press “ ”. The instrument displays the following screen:  Line 1 ...

  • Page 44: Recalling The 24H Analysis Data On The Display

    HT155 - HT157 7.1.2. RECALLING THE 24H ANALYSIS DATA ON THE DISPLAY 1. Select a datum corresponding to the “24H” indication available in the list of saved measures and press “ ”. The instrument displays the following screen:  Line 1 ...
  • Page 45 HT155 - HT157 Fig. 45: Display of distribution graphic of the "24H" analysis values 4. Press the “ ” or “ ” keys to go to the next pages and the “ ” or “ ” keys to display the values of data in the single intervals 5.

  • Page 46: Recalling The Integration Measurement Data On The Display

    HT155 - HT157 7.1.3. RECALLING THE INTEGRATION MEASUREMENT DATA ON THE DISPLAY 1. Select a datum corresponding to the “INT” indication available in the list of saved measures and press “ ”. The instrument displays the following screen:  Line 1 ...

  • Page 47: Recalling The Data Of The Octave Band Analysis (1/1) On The Display

    HT155 - HT157 7.1.4. RECALLING THE DATA OF THE OCTAVE BAND ANALYSIS (1/1) ON THE DISPLAY 1. Select a datum corresponding to the “OCT” indication available in the list of saved measures and press “ ”. The instrument shows the following screens, which can be selected by using the “...

  • Page 48: Recalling The Data Of The Analysis In Total Octave Band (1/1)

    HT155 - HT157 7.1.4.1. Recalling the data of the analysis in Total octave band (1/1) Within the “OCT” analysis, it is possible to display the following screens relevant to the “TOTAL” function, which considers the whole of the data: Fig. 50: Display of "TOTAL" analysis data...

  • Page 49: Recalling The Data Of The Analysis In Third-Octave Band (1/3) On The Display

    HT155 - HT157 7.1.5. RECALLING THE DATA OF THE ANALYSIS IN THIRD-OCTAVE BAND (1/3) ON THE DISPLAY 1. Select a datum corresponding to the “1/3OCT” indication available in the list of saved measures and press “ ”. The instrument shows the following screens, which can be selected by using the “...

  • Page 50: Data Transfer Onto Usb Pen Drive

    HT155 - HT157 7.2. DATA TRANSFER ONTO USB PEN DRIVE CAUTION Transferring the data contained in the instrument’s memory onto an external USB pen drive unit is guaranteed only when using the USB pen drive provided with the instrument. This does not exclude, however, that appropriately formatted USB pen drives can be used.

  • Page 51: Operations With Soundview Software

    HT155 - HT157 8. OPERATIONS WITH SOUNDVIEW SOFTWARE 8.1. FOREWORD The SoundView Windows software provided with the instrument allows carrying out the following operations:  Downloading the data of the recordings carried out with the instrument connected to the PC via USB interface ...
  • Page 52 HT155 - HT157 5. Press the “Browse” key and select the folder …\Sound Meter usb driver\ inside the USB pen drive provided (after saving the content of the pen drive on the HD of the PC). Press “Next” 6. Select the file with extension “ch375wdm.inf” and proceed with “Next”...

  • Page 53: Use Of Soundview Software

    HT155 - HT157 8.4. USE OF SOUNDVIEW SOFTWARE After installing the software from the file “Setup.exe” contained in the USB pen drive provided with the instrument, launch the program. The PC shows the following screen: Fig. 53: Initial software screen 8.4.1.

  • Page 54: File Menu

    HT155 - HT157 8.4.2. FILE MENU This menu contains the following controls: Control Description Input Name (CTRL+N) It allows opening a file with extension (*.XLS) relevant to a defined measure name, available inside the PC (see § 8.4.4) It allows selecting a folder in the PC, in which there are...

  • Page 55: View Menu

    HT155 - HT157 8.4.3. VIEW MENU In this menu there are the following controls, which can be activated by the user in order to carry out the operations more rapidly:  Toolbar  it allows displaying/hiding the toolbar  Status bar  it allows displaying/hiding the status bar ...

  • Page 56: Result Menu

    HT155 - HT157 8.4.5. RESULT MENU This menu contains the controls which allow transferring the recorder data from the instrument, analyzing the data and clearing all data from the instrument’s memory Control Description It allows downloading the instrument’s memory content onto the PC.

  • Page 57: Maintenance

    HT155 - HT157 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 58: Technical Specifications

    HT155 - HT157 TECHNICAL SPECIFICATIONS 10.1. TECHNICAL SPECIFICATIONS Uncertainties are referred to a temperature of 23°C±5°C with relative humidity <80%UR  Measuring range 25  140dB Weighting type A: 30  140dB Weighting type C: 35  140dB Weighting type Z: 50 ...

  • Page 59: Statistic Analisys Chararcteristics

    HT155 - HT157 10.2. STATISTIC ANALISYS CHARARCTERISTICS  Functions: SLM statistic analysis in weighting A Frequency integration with programmable period Statistic analysis in 24 hours (24H) Analysis type Measured parameters (*) , SD, AFmax AF10 AF50 AF90 AF95 AFmin Statistic...

  • Page 60: General Characteristics

    IEC 61260:1995 Class 1 This instrument complies with the requirements of European Directive EMC 2004/108/EC 10.6. ACCESSORIES  Instrument HT155 or HT157  Portable calibrator HT151  Windproof protection  Mini-USB/USB cable for PC connection  USB Pen Drive type TRASCEND JF V30/2GB ...

  • Page 61: Service

    HT155 - HT157 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 62: Appendixes

    HT155 - HT157 APPENDIXES 12.1. APPENDIX 1 – FREQUENCY WEIGHTING CHARACTERISTICS EN - 60...

  • Page 63: Appendix 2 - Characteristics Of 1/3 Octave Band Filter

    HT155 - HT157 12.2. APPENDIX 2 – CHARACTERISTICS OF 1/3 OCTAVE BAND FILTER EN - 61...
  • Page 64 HT155 - HT157 EN - 62...
  • Page 65 HT155 - HT157 EN - 63...

  • Page 66: Appendix 3 - Frequency Weighting A, C

    HT155 - HT157 12.3. APPENDIX 3 – FREQUENCY WEIGHTING A, C Frequency [Hz] A [dB] C [dB] Frequency [Hz] A [dB] C [dB] -70.4 -14.3 -3.2 12.5 -63.4 -11.2 -1.9 -56.7 -8.5 -0.8 -50.5 -6.2 1000 -44.7 -4.4 1250 31.5 -39.4...

  • Page 67: Appendix 4 - Characteristics Of 4Hz High-Pass Digital Filter

    HT155 - HT157 12.4. APPENDIX 4 – CHARACTERISTICS OF 4HZ HIGH-PASS DIGITAL FILTER EN - 65...

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