Stanford Research Systems SR844 User Manual page 171

Daughter Boards
There are 6 small daughter boards mounted to the Motherboard.
•
Signal Input (84SIG); RF input amplifier and attenuator
•
Mixer (84CMX); RF mixers
•
IF Amplifier (84IFN); 2 channels of IF filtering and gain, includes ADC.
•
Reference (84XRF); external reference input and PLL.
•
Divider (84DVC); reference frequency divider chain.
•
Digital Signal Processor (84DSP); processing and DC analog inputs and outputs.
This board is mounted on the bottom of the Motherboard.
These boards overlap in some cases. Do not attempt to remove a daughter board until all
boards which are above it are removed. The locations are shown below.
IFN
SIG
Circuit Board Locations
Motherboard Top View
DVC
CMX
SR844 RF Lock-In Amplifier
6-5
XRF