Ch. 8. Conductive AFM (ORCA) Sec. 8.5. Testing the ORCA Amplifier
1.
Test the first gain stage of the Dual Gain
ORCA Amplifier
• Install the 1M Ohm test resistor.
• Do an IV plot.
• Monitor both the Current and Current 2
data channels.
• Verify that the 1Meg Ohm resistor
produces 1uA for 1 volt of sample bias.
Note Note the behavior of the Current signal
as it saturates from too much current flow
through the circuit. This test is not harmful to
the ORCA amplifier. It is mainly a way of
demonstrating the behavior of the circuit
when the final gain stage is saturated.
DRAFT
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