User manual

21
BASIC SET-UP
OPTION 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.
OPTION 2: 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
denitely generate error messages.
Press ‘enter’, turn the encoder to select either ‘Hera only’ or
‘with Argos’ and press ‘enter’ again to conrm your selection.
OPTION 3: Frequency weighting lter
With this option, you can choose which frequency weighting
lter is applied to the measurement. Choices are A-lter or
C-lter. The default is A-lter as it is the most commonly used
lter curve.
IMPORTANT NOTICE: If the Hera is used together with
an Argos, you need to change the weighting lter 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-lter. Please refer to the Argos user manual for
detailed information.
OPTION 4: Microphone position compensation
The measuring microphone is normally installed somewhere
where it cannot easily be reached, to prevent it from being
covered. However there is likely to be a difference in sound
pressure level between the microphone point and – for
example - the dance oor. This procedure allows you to
calculate this difference so that the Hera can compensate for it
in its measurements.
Positional compensation allows level differences between the
actual position of the microphone and the place where sound
pressure level is tested (by the authorities) to be taken into
account.
OPTION 4.1: Viewing compensation setting
This option simply shows the actual compensation in decibel
on the LED display.
OPTION 4.2: Erasing the compensation setting
This option is used to erase the compensation setting and
to return to direct measurement of sound at the microphone
position. Press ‘enter’ to conrm and ‘undo’ to cancel.
OPTION 4.3: Measuring the difference
The calibration of positional compensation requires a pink-
noise or sinus generator. In case Hera is used together with
Argos, no external generator is required. Indeed, the Apex
Argos has a built-in pink-noise generator. The Argos’ generator
will be remotely controlled by the Hera.
If you use a tone generator, we recommend you to use a sinus
of a 1 kHz frequency.
COMMENT: Hera and its microphone are calibrated
together at the factory and are a pair. If you install a Hera
and an Argos together, ONLY USE THE MICROPHONE
SUPPLIED WITH THE HERA.