SETUP >>
HD 2020
Use the arrows to increase/decrease the value. With the SETUP button is confirmed and
passed to the current day:
SETUP >>
HD 2020
Use the arrows to increase /decrease the value. With the SETUP buttonis confirmed and the
current time passes.
>>
HD 2020
h06h06
Use the arrows to increase/decrease the value. With the SETUP button is confirmed and
passed to the current minutes.
SETUP >>
HD 2020
‘30‘30
SETUP >>
HD 2020
Each time you press the arrow keys, the seconds value to zero. With the SETUP button you
Confirm and move to the menu section on the calibration with the lighting of the frst triangle
to the left and display of calibration (the parameter is not user editable).
HD 2020
(calibration year - frst triangle)
With the SETUP button switches per month span (the parameter is not user editable).
HD 2020
(calibration month - frst triangle)
With the SETUP button switches per day span (the parameter is not user editable).
HD 2020
(calibration day - frst triangle)
With the SETUP button switch setting the date of calibration with the lighting of the second
triangle to the left and display the number of years of calibration. You can type the number of
years and months between the date of calibration, entered by the laboratory conducting the
formal point and the expiry date.
After the interval set, the triangle is fashing to indicate that it is necessary to re-start point
of the calibrator.
HD 2020
(validity years - second triangle)
Use the arrows to increase /decrease the value. With the SETUP button you confirm and
pass the number of months of validity.
HD 2020
(validity months - second triangle)
Use the arrows to increase /decrease the value. With the SETUP button you confirm and back to
the default mode of operation.
SETUP
s arrow key
t arrow key
Under standard conditions, select either the sound pressure levels of 94dB and 114dB.
In the menu increases the current value.
Under standard conditions, select either the sound pressure levels of 94dB and 114dB.
In the menu increases the current value.
CALIBRATION PROCEDURE
The HD 2020 can calibrate standard ½” 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.
The calibration can be effected by holding the HD2020 upright as well as by leaning the instruments
on a work table.the worktable doesn’t transmit vibrations.
While measuring, you should move neither the microphone nor the calibrator; make sure that
A small misalignment of the microphone and calibrator axes is allowed.
• Before beginning to calibrate, you should make sure that the ambient noise level doesn’t af-
fect the calibration. After inserting the microphone into the cavity, with the sound level meter
and the calibrator off, switch on the sound level meter and detect the unweighted ambient
Sound pressure level. If the measured level is below 78 dB, you can use both calibration
sound levels (94 dB and 114 dB); if the level is between 78 dB and 98 dB you can use the
114 dB level only, while a sound level above 98 dB means that calibration is not possible.
• PresstheON/OFFkeytoswitchtheinstrumenton.
• Use the arrow keys to select the sound level: 94 dB or 114 dB.
• If the value displayed on the display stops fashing within a few seconds, this indicates
Improper placement of the microphone.
• Proceed with the calibration of sound level meter, following the procedure indicated on the
Instrument manual.
• Apply the correction to the pressure level generated in the type of microphone (see the fol-
Lowing chapter).
• At the end, turn the sound level meter and calibrator off and remove the microphone from
The cavity.
With the HD2020 calibrator cancalibrate any type of SLM is provided with a microphone or
laboratory sample of work from ½” in conformity with the standards described in IEC 61094-
01 and IEC 61094-4.
Use the arrows to increase/decrease the value. With the SETUP button is confirmed and
passed to the current minutes.
Corrections for the type of microphone
The HD2020 calibrator generates a sound pressure level equal to 94 dB (or 114 dB) reported
in 20ìPa. The normal working microphones ½”, used on sound level meters are engineered
to have a fat frequency response in terms of free feld or diffuse feld is respectively in a feld
of progressive plane waves with propagation direction coincides with the axis of microphone
and in a feld of sound waves from all directions. These propagation conditions are different
fromthoseexperienced inthecavityofthesoundcalibrator. Freefeldrefectionscaused by
the presence of the microphone alter the sound level by increasing the effective sensitivity of
the capsule at high frequencies. The microphones are optimized for free-feld measurements
exploit this phenomenon to obtain a fat frequency response up to very high frequencies. In
these microphones increase in noise level at 1 kHz is approximately 0.05 dB ÷ 0:20 dB. When
you calibrate a microphone for free feld should therefore refect this difference in sound level
meter by setting a noise level less than 0.1 dB and 0.2 dB compared to the nominal calibrator.
The microphones are optimized for diffuse feld measurements do not need instead of correc-
tions when calibrated cavity closed at 1 kHz.
REPORTING FOR LOW BATTERY AND BATTERY REPLACEMENT
The calibrator HD 2020 is equipped with two batteries: a user-replaceable 9V alkaline battery
and lithium. This serves to keep the clock and calendar function even if the external battery: its
replacement should be done at an authorized by Delta Ohm.
The charge level of the 9V battery is continuously monitored:
• If the battery is fully charged, its symbol is off;
• If the battery is partially charged, its symbol blinks: please replace the battery as soon as
possible;
• If the charge is insuffcient to ensure normal operation of the instrument, the symbol remains
constantly lit. When the battery is discharged, the calibrator is turned off within approxi-
mately 10 seconds.
To replace the 9V battery, turn off the power and open the door at the bottom of the instrument.
Replace the battery. Close the door. The date, time interval expires calibration will be saved
if the battery is fully charged. The average duration of the battery depends on the presence
or absence of the external, if the external battery is present; the average life of battery is ap-
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