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GPA4 User manual
v 1.2
Input BNC
This connector is the input for the corresponding amplifier channel.
INPUT switch
This switch can be used to turn on or off the amplifier input. When the switch is in the ON
position the signal present at the BNC input is the input for the corresponding amplifier
channel. When the switch is in the OFF position the input of the corresponding amplifier
channel is connected to ground and the BNC input is disconnected from the circuit and in
a floating condition.
The INPUT switch can be used to turn off the input and evaluate the offset amount
introduced by the internal offset compensation at the amplifier channel output.
It is suggested to turn off the unused inputs to reduce the coupling of external
interference to the instrument.
OFFSET switch
When the channel is DC coupled the offset compensation can be turned on or off using
this switch.
Note that this switch has no effects when the high pass filter is used.
POWER ON indicator
The indicator is a greed led that is on when the amplifier is powered. The indicator is
common for all channels when on indicate that all channels are on.
Output BNC
This connector is the output for the corresponding amplifier channel.
OFFSET compensation potentiometer
This multi-turn potentiometer controls the offset compensation. To activate the offset
compensation the channel have to be DC coupled (refer to LOW PASS FILTER selector)
and the OFFSET switch have to be placed in the ON position.
Note that the offset is multiplied by the gain selected and the potentiometer sensitivity
increase with the gain.
pag. 5
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