Rear Outputs; Communications; Schematics - Stanford Research Systems SR124 Operation And Service Manual

5.7 Rear outputs

5.7 Rear outputs

5.8 Communications

5.9 Schematics

SR124 Analog Lock-In Amplifier
Figure 5.3: Trimming the replacement JFET
The Rear outputs board contains the fully-di erential bu er ampli-
fiers to receive the oscillator quadrant signals and drive them relative
to chassis ground.
The small Communications board, located near the power-entry
module, contains the fiber optic transmit and receive components. A
simple RS-232 driver circuit is also on this board.
Circuit schematic diagrams follow this page.
Test Points
TRIMMER
5 – 5