Johansson 6504 User Manual page 10

Each input has a 20 dB switchable amplifier. This is used as aditional 20 dB attenuator for high levels up to 95 dBµV.
Input Amplifier
To switch off the input amplifier.
- Select the input to be attenuated.
- Turn the button to select the Filter - Input Selection mode.
- Push the rotary button to enter the selected mode.
- Turn the button to select the input.
Turn continuously the button through every cluster
to have access to the input selection.
- Push the button to confirm.
- Turn the button to select the Attenuator mode.
- Push the rotary button to enter the selected mode.
- Turn the button to switch off the 20 dB amplifier.
- Push the button to confirm.
The LED is GREEN.
Filter-Input Selection
The LED is now RED colored.
Filter-Input Selection
2
1 2 3 4 5 6 7
1
All LEDs of selected input are activated
The LED is GREEN.
Filter-Input Selection
Attenuator
The LED is GREEN.
Attenuator
The LED is now RED colored.
In 'OFF' position
the input signal is
20 dB attenuated.
Attenuator
The LED is GREEN.
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3
10