Gentec-EO T-Rad-USB (LEMO) - 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