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Delta OHM HD 2020 Manual
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Delta OHM HD 2020 Manual

Delta OHM HD 2020 Manual

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REV. 1.1
th
15
June 2012
HD 2020
ENGLISH
Our instruments' quality level is the result of the product continuous development. This can bring about dif-
ferences between information written in this manual and the instrument that you have purchased. We cannot
entirely exclude errors in the manual, for which we apologize.
Data, figures and descriptions contained in this manual cannot be legally asserted. We reserve the right to
make changes and corrections without prior notice.

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Summary of Contents for Delta OHM HD 2020

  • Page 1 REV. 1.1 June 2012 HD 2020 ENGLISH Our instruments' quality level is the result of the product continuous development. This can bring about dif- ferences between information written in this manual and the instrument that you have purchased. We cannot entirely exclude errors in the manual, for which we apologize.
  • Page 2 HD 2020 Acoustic calibrator ON-OFF key: turns on and off the instrument. When you turn the instrument on, the display will switch on about two seconds later. SETUP key: allows you to enter and scroll menu. To exit, press it repeatedly until you go back to the standard screen.
  • Page 3 CERTIFICATO DI CONFORMITÀ DEL COSTRUTTORE MANUFACTURER’S CERTIFICATE OF CONFORMITY rilasciato da issued by DELTA OHM SRL STRUMENTI DI MISURA DATA 2012/06/15 DATE Si certifica che gli strumenti sotto riportati hanno superato positivamente tutti i test di produzione e sono conformi alle specifiche, valide alla data del test, riportate nella documentazione tecnica.

  • Page 4: Introduction

    The HD 2020 calibrator can be conveniently used both in laboratory and in the field. The 114 dB sound level allows performing calibrations even in high background noise environments.

  • Page 5: Display And Keypad Description

    DISPLAY AND KEYPAD DESCRIPTION The instrument keypad is composed of 4 keys. Listed below are their main functions. ON-OFF key Press the ON/OFF key to turn on and off the instrument. When you turn the instrument on, all the display segments are shown, for a few seconds ..
  • Page 6 Use the arrow keys to increase/decrease the value. Press the SETUP key to confirm and go to the current month: >> Use the arrow keys to increase/decrease the value. Press the SETUP key to confirm and go to the current day: >>...
  • Page 7 Pressing the SETUP key, calibration month appears (the parameter cannot be modified by the user). (calibration month – first triangle) Pressing the SETUP key, calibration day appears (the parameter cannot be modified by the user). (calibration day – first triangle) Pressing the SETUP key you can proceed to the expiration date of the calibration;...

  • Page 8: Calibration Procedure

    ALIBRATION PROCEDURE The HD 2020 can calibrate standard 1/2” microphones compliant with IEC 61094-1 and IEC61094-2. To calibrate the microphone, insert it deep into the cavity. The O-ring will offer some resistance. During calibration the HD2020 can be held in vertical position or placed on a flat surface.

  • Page 9: Low Battery Indication And Replacement

    OW BATTERY INDICATION AND REPLACEMENT The HD 2020 calibrator is provided with two batteries: a 9V alkaline battery that can be replaced by the user and a lithium buffer battery. The latter allows the date indicator and watch to work even without external bat- tery: it must be replaced by a Delta Ohm authorized service centre.

  • Page 10: Construction And Functioning

    Fig. 3 Calibrator mechanical construction (section). Fig. 3 schematizes the HD 2020 calibrator structure (section). The battery compartment is on the right side of the case. The printed circuits and the electronics are over and under the battery compartment. The display and the keypad take up the higher part.

  • Page 11: Instrument Storage

    The electronics consist mainly of an oscillator combining high stability and low distortion, as well as an RMS converter, the automatic gain control (AGC), the driver for the ceramic resonator and the feedback signal conditioning. The RMS level of the signal provided by the sensor is compared with the factory set reference level; the dif- ference adjusts the signal width generated by the oscillator and thus the acoustic signal generated by the piezoelectric transducer through automatic gain control.

  • Page 12: Functioning And Operating Safety

    FUNCTIONING AND OPERATING SAFETY Authorized use Please read carefully the specifications listed in the following chapter. You are allowed to use the instrument only in compliance with these instructions. Any other use is not authorized. General safety instructions This instrument is manufactured and tested in compliance with EN 61010-1 safety standard on electronic measuring instruments and it leaves the factory in perfect safety conditions.

  • Page 13: Specifications

    SPECIFICATIONS The HD 2020 calibrator complies with IEC 60942-2003 Class 1 and ANSI S1.40-1984. for standard 1/2” microphones (12.7 ± 0.03 mm) ac- Coupling cavity: cording to IEC 61094-1 and IEC 61094-4 Frequency: 1000 Hz Frequency tolerance: 1% in the range -10...+50°C and 10%...90%RH Sound pressure level: 94.0 dB and 114.0 dB ±0.2 dB at 1kHz...

  • Page 14: Ordering Code

    ORDERING CODE HD2020 The kit includes: HD2020 calibrator, one 9V alkaline battery, instruction manual and I- SO 9001 calibration report.

  • Page 15: Table Of Contents

    CONTENTS INTRODUCTION ............................... 4 DISPLAY AND KEYPAD DESCRIPTION ......................5 CALIBRATION PROCEDURE .......................... 8 LOW BATTERY INDICATION AND REPLACEMENT ..................9 CONSTRUCTION AND FUNCTIONING ......................10 INSTRUMENT STORAGE ..........................11 FUNCTIONING AND OPERATING SAFETY ....................12 SPECIFICATIONS ............................13 ORDERING CODE ............................14...
  • Page 16 All DELTA OHM instruments have been subjected to strict tests and are guaranteed for 24 months from date of purchase. DELTA OHM will repair or replace free of charge any parts which it considers to be inef- ficient within the guarantee period. Complete replacement is excluded and no request of damages are rec- ognized.