15.10Plugs and connections
15.10.1 Removable preamplifier PR23
It is often indispensable to remove the preamplifier from the sound level meter to connect it on an extension.
The preamplifier is fixed on the sound level meter with a Push-pull mechanism.
This mechanical protection avoids any unexpected removal of the preamplifier or of the extension.
To remove the preamplifier, proceed as follows:
Do not turn or pull the body of the amplifier.
Take the black part between your thumb and forefinger and pull firmly.
To reintroduce the preamplifier, put it in position in the plug with the red mark positioned toward the
back on the housing. Push in it
:
Wiring of the input connection 7 points (on
sound level meter)
1
– Signal
2
– V+ power supply: 24 Volts DC
3
– Heating power supply: Not active
4
– Not connected
5
– Power supply ground
6
– Not connected
7
– Not connected
Plug body
: linked to the ground
15.10.2 Plugs
Located under the breastplate in soft rubber, the different plugs and connections allow to:
•
Communicate with external items: I/O interface
•
Load the battery and/or power supply
•
Access to the micro SD card
64
Technical features
Mass
Mass
Mass
V+
Signal
Heating
power
supply
Micro SD card location
Not used
Mini USB connector for data transfer –
load battery – mains voltage adaptor
Monitoring light of the state of
battery charge
I/O 1 In : Input
: allows the
launching of a measurement
I/O 1 Out : Output
: detection of
levels
I/O 2 In : Input
: not used
I/O 2 Out : Output
: DC - 0-10V
