8 Electronics
Signal amplifier board
239
Signal amplifier board
The signal amplifier board amplifies the output of the detector. The signal ampli-
fier circuit produces an output voltage of 0 to 10 volts dc, proportional to the loga-
rithm of the input current of 3 picoamps to 50 microamps.
An analog-to-digital converter converts the amplifier output voltage to digital
information. The HP-IB/MS control card “unlogs” the data into abundance counts
proportional to the detector signal current.
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