- -
4
INTRODUCTION
The HD 2020 sound level calibrator is a portable, battery operated sound source, suitable
for sound level meters (portable and laboratory) and acoustic stations.
It allows calibrating
1/2” microphones with mechanical dimensions compliant with IEC
61094-
1 (“Measurement microphones. Part 1: Specifications for laboratory standard mi-
crophones
”) and IEC 61094-4 (“Measurement microphones. Part 4: Specifications for
working standard microphones
”).
The calibration pressure levels of 94dB and 114dB can be selected by the keypad. The
1000 Hz frequency cannot be changed.
If the microphone is absent or not inserted correctly into the calibrator cavity, the sound
level will blink on the display.
To conserve battery life, the instrument is provided with an automatic power off function: if
you leave the instrument on with open cavity, it switches off automatically after 30 sec-
onds. If the cavity is closed and the microphone is inserted, the instrument switches off 5
minutes
after turning on, provided that you don’t press any key.
The calibrator display shows calibration pressure level, battery life, current date and time.
The internal clock allows to set up the validity period of calibration, expressed in years and
months, starting from the date of adjustment: as soon as the time interval has elapsed, a
blinking symbol alerts to make a new adjustment.
The HD 2020 calibrator advantages are:
The 1000Hz frequency allows calibrating sound level meters with any weighting (LIN,
A, B, ...), without applying any correction factor.
The calibration sound pressure level is indipendent of atmosferic pressure:
you don’t
need to adjust the value according to static pressure over a wide range of values.
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.
Its simplicity of use allows even unqualified staff to employ it.
The LCD makes easy to setup the calibrator, signals the calibration expiry and allows
to control the level battery.
