HTA Instrumentation HD 2020 Manual

ACOUSTIC CALIBRATOR

ACOUSTIC CALIBRATOR
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
½"microphones with mechanical dimensions compliant with IEC 61094-1 ("Measureme nt
Part 1: Specifications for laboratory standard microphones") 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 seconds. 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.
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HD 2020
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ACOUSTIC CALIBRATOR
1. ON-OFF key: turns on and off the instrument. When you turn the instrument on, the display
will switch on about three seconds later.
2. SETUP key: allows you to enter and scroll menu. To exit, press it repeatedly until you go
back to the standard screen.
3. Display. When you turn the instrument on, it shows all segments on, and then the sound
pressure level (94 or 114dB) will appear in standard view.
4. Calibrator cavity for conventional ½ inch microphones.
5. ▼ key: in standard mode, it selects 94dB and 114dB pressure levels alternately. In menu
mode, it decreases the current value.
6. ▲ key: in standard mode, it selects 94dB and 114dB pressure levels alternately. In menu
mode, it increases the current value.
7. Battery lid.
Advantages of the HD 2020 calibrator are:
•The 1000Hzfrequency allowscalibrating soundlevelmeterswithanyweighting (LIN,A,B,...),
without applying any correction factor.
• The calibration sound pressure level is independent of atmospheric 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 feld. The 114
dB sound level allows performing calibrations even in high background noise environments.
• Its simplicity of use allows the use even by unskilled personnel.
• ThepresenceoftheLCDhelpsyouthroughthestepsofsettingthecalibrator,
of the span and allows you to check the status of the battery.

DESCRIPTION KEYBOARD AND DISPLAY

The keyboard instrument consists of 4 buttons.
The following describes in detail the functions performed by each.
ON
ON-OFF key
OFF
Pressthe ON/OFF key to turnthe instrument on and off.
When instrument is on, all display segments are shown for a few seconds,
...an auto-test including the level of battery charge starts and brings the instrument to the
standard working condition.
Note: between the instant when you press the ON / OFF button and switching the display
pass about three seconds: this time it is necessary to perform the initial self-test.

Auto-off feature (Auto-Power Off)

The instrument has the auto-off feature (Auto-Power Off) that turns the meter off after 5 min-
utes if, in this interval, the microphone is inserted into the cavity of the calibrator and press
any button.
If the cavity is open, indicating the noise level in the display: in these conditions the instrument
will turn off automatically after 30 seconds
Auto-off feature cannot be excluded.

SETUP key

SETUP
The SETUP key allows entering and viewing the menu. To exit, press the SETUP key until you
go back to the standard screen, or keep it pressed for more than 2 seconds.
The menu shows:
• Currentdateandtimeintheformatyear,month, day,hour,minute,second.
• Currentdateandtimeintheformatyear, month, dayofthelastcalibration.
• The interval between the calibration date and the expiry date in years and months.
The user can set each of these items by selecting the SETUP button and modifying it with the
arrow keys . To confrm the setting, press the SETUP.
From the standard display, press SETUP to see the current year:
HD 2020 HD 2020
94 94
>>
Use the arrows to increase/decrease thevalue. With the SETUP button is confirmed and
changes to current month:
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signaltheend
HD 2020
HD 2020
94 94
HD 2020 HD 2020
>>
SETUP