Stanford Research Systems SR865A Operation Manual page 211

Appendix G Performance Tests 193
a) Use the front panel to make the following adjustments
Touch {Fint} to display the internal frequency keypad
Enter the frequency from the table.
b) Wait for the readings to stabilize. Record the value of θ (orange).
c) Repeat steps 4a and 4b for all frequencies in the table.
5) This completes the phase accuracy test. Enter the results of this test in the test record at the end of
this section.
SR865A DSP Lock-in Amplifier