Stanford Research Systems SR865A Operation Manual page 123

Chapter 4
Example Commands
RSRC 1
RSRC EXT
RSRC ?
FREQ 10E3
FREQ 10 KHZ
FREQ 10000.0
APHS
Set reference source to external
Query the reference source
Set the internal reference frequency to 10000 Hz
Execute Auto Phase
Programming
SR865A DSP Lock-in Amplifier
105