Time domain description of a lock in amplifier – Gentec-EO T-Rad-USB (LEMO) User Manual
Page 7
T-RAD-LEMO-USB Instruction Manual
Version 1.0
June. 2012
7
If we square these and add them together we obtain:
Now taking the square root gives:
The output of the multiplication is no longer phase dependant.
2.2 Time Domain Description of a Lock In Amplifier.
The input signal has peak amplitude of 5V (10V peak to peak) and a frequency of 25Hz and is
shown in figure 1.
Figure 1 Input Signal