Sound Calibrator, Class 1

HD2024

Sound calibrator for sound level meters and 1/2" and 1/4" precision microphones, with 94.0 dB level at 1000 Hz, Class 1 compliance, auto power off and IP64 protection.
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Introduction

The HD2024 Sound Calibrator is a portable, battery-operated sound source for calibration and check of microphones and sound level meters. It is designed for field use and laboratories and conforms to the requirements in IEC 60942 for a class 1 sound calibrator.

Emission signal is 1 kHz at 94 dB. 

The signal is generated by a piezoceramic source inside the acoustic coupler. An internal sensor measures the level in the coupler and a feedback circuit accurately adjusts the level so that the calibration level is virtually independent of ambient conditions like atmospheric pressure, temperature and humidity within the specified range of operation.

The calibrator allows adjustment of 1/2” and 1/4”  (with adapter).

HD2024 is powered from one 9V alkaline battery (6LR61). If the voltage supplied by the batteries is too low to ensure proper operation, the calibrator will automatically switch off or not switch on.

Class 1 precision
Class 1 precision
Complies IEC 60942-2003 Class 1 and ANSI S1.40-1984.
Field and Lab use
Field and Lab use
IP64 grade for field and lab use, with 94.0 dB level allows check of both microphones and class 1 sound level meters
No weighting correction
No weighting correction
1000 Hz supports LIN, A, B and other weightings without correction factors.
Pressure-stable output
Pressure-stable output
Static pressure influence is < 0.1 dB from 65…108 kPa.
Car inspections ready
Car inspections ready
Developed with a special focus on the requirements of vehicle car inspections

Features

Acoustic output

The calibrator generates a stable 94.0 dB sound pressure level at 1000 Hz, referred to 20 μPa.

Microphone cavity

The coupling cavity accepts standard ½" microphones according to IEC 61094-1 and IEC 61094-4.

¼" microphone option

The optional HD2020AD4 adapter allows calibration of ¼" microphones.

Output control

The electronics use an oscillator, RMS converter, automatic gain control and feedback sensor to regulate the acoustic signal.

Battery monitoring

The instrument uses a 9 V alkaline battery and indicates insufficient charge with a LOW BATT LED.

Operating conditions

The calibrator operates from -10 ÷ +50 °C and ≤ 90%RH, with ABS housing and IP64 protection.

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