24
BASIC SET-UP
Function 1: Choice of language
This option allows you to choose the language in which
messages will be displayed. All types of messages are
affected, including both error/event list and measurement list.
The available languages are English, Dutch, German and
French.
Press ‘enter’, select the desired language using the rotary
encoder and then push ‘enter’ again to store your choice.
Function 2: Preset
This function allows users requiring to comply with the Belgian
VLAREM act to change all relevant parameters at once.
Press ‘enter’, select ‘VLAREM Cat.2’ for Class 3 or ‘VLAREM
Cat.3’ for Class 2 and then press ‘enter’ to confirm your choice.
Hera will ask you to confirm your choice using the ‘enter’ key or
to cancel using ‘undo’.
The following parameters are automatically modified:
VLAREM Cat.2
Frequency-weighting: A-filter
Threshold:
95 dB, mode ‘Always’
Log time:
15 min
Warning relay: 15 min
VLAREM Cat.3
Frequency-weighting: A-filter
Threshold:
100 dB, mode ‘Always’
Log Time:
60 min
Warning relay:
60 min
For more information, refer to the “Technische handleiding
- nieuwe geluidsnormen voor muziekactiviteiten” (Technical
manual - new noise regulation for music activities).
Function 3: Choice of operational mode
This option allows you to choose between operating the Hera
as a stand-alone device or in connection with the Apex Argos
limiter.
This option is vital for the proper functioning of
the Hera. If this option is not set up correctly, the Hera will
definitely generate error messages.
Press ‘enter’, turn the encoder to select either ‘Hera only’ or
‘with Argos’ and press ‘enter’ again to confirm your selection.
Function 4: Frequency weighting filter
With this option, you can choose which frequency weighting
filter is applied to the measurement. Choices are A-filter or
C-filter. The default is A-filter as it is the most commonly used
filter curve.
IMPORTANT NOTICE:
If the Hera is used together with an Argos, you need to
change the weighting filter of the Argos as well. This can
be done by changing the position of a jumper inside the
Argos. Argos is by default always set on A-filter. Please
refer to the Argos user manual for detailed information.
Function 5: Calibration
It is important to regularly check the accuracy of the measured
values. In specific cases, it may also be necessary to calibrate
the measurement chain before use (see section ‘Measurement
microphone and the measurement chain’ earlier in this manual).
The calibration shall be performed using an IEC 60942 class
1 or class 2 sound calibrator (1/2”, 1 kHz, 94 dB). To ensure
accuracy, perform a calibration only if it is quiet !
Apex recommends the following calibrator:
• Brüel & Kjaer Type 4231
Function 5.1: Viewing the calibration setting
This function displays the current calibration offset in decibels
on the LED display.
Function 5.2: Clear the calibration setting
This function is used to the clear the calibration setting and
return to the factory calibration. Press ‘enter’ to confirm and
‘undo’ to cancel.
Function 5.3: Calibration procedure
With this function you can recalibrate the measuring chain.
Step 1
: Place the microphone in the sound calibrator. Make
sure the microphone correctly fits in and no gap remains.
Keep the sound calibrator off for the moment. Ensure the
place is quiet. When you are ready press ‘enter’ or ‘undo’
to cancel.
Step 2:
Hera shows “Wait for zero” and will perform the first
step of the calibration process automatically. Do NOT touch
the microphone and keep the sound calibrator off.
Summary of Contents for Hera
Page 1: ...w w w a p e x a u d i o e u Hera User manual ...
Page 11: ...11 ...
Page 23: ...23 HERA installer menu overview ...
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