DeltaOHM HD2010UC/A, Руководство по эксплуатации, Страница: 49 / 162

HD2010UC/A
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V4.1
CALIBRATION
Calibration is periodically carried out to ensure the validity of measurements performed by
the sound level meter and to control possible long-term drifts of the measuring chain microphone-
preamplifier-instrument.
The HD2010UC/A sound level meter stores all calibration typical parameters with respective
date and time in a reserved area. Calibration types can be:
•
Acoustic calibration by means of a 1kHz sound level generator, like HD2020
•
Electric calibration (Capacitive Transducer Calibration) with the possibility to measure the fre-
quency response of the whole measurement chain, microphone included, using the built-in sig-
nal generator.
Calibration is necessary every time that the calibrator level, measured by the sound level meter, de-
viates from the nominal value for more than 0.5dB.
The acoustic calibration includes the capacitive transducer one and, before carrying it out,
it is suggested to ensure that the environment where you are operating is suitable: no sudden
sounds, no vibrations on the surface where the instrument is placed, instrument thermal stability.
The electric calibration allows a quick inspection of the electric parameters of microphone
and instrument.
The calibration procedure includes the inspection of the microphone polarization.
Calibration programs are in the “PROGRAMS” menu, accessible through the PROG key.
56.9
60.8
79.3
30 110
01:08:25
Tint= s
10
LFp
Leq
Lpk
dBA
dBC
dBC
2003/01/01 10 00 00
: :
Batt 95% Mem 92.5%
: :
SELECT PROGRAM
Memory Navigator
Electric Calibration
Acoustic Calibration
Frequency Response
...
Diagnostic Check
Use the UP and DOWN arrows to select the calibration to be carried out:
2004/01/01 10 00 00
: :
Batt 95% Mem 92.5%
: :
SELECT PROGRAM
Electric Calibration
Acoustic Calibration
Frequency Response
Diagnostic Check
Fig. 16
when you press SELECT, the calibration display will appear.