Output Low-Frequency Sinusoidal Signal on the AUX Output of MFLI


This blog shows how to output sinusoidal signals on the AUX Output with the MD multi-demodulator option. Keep in mind that the AUX output are not designed to output sinusoidal signals as the Signal Output.



1. On AUX OUT 1 a 1 V DC offset is set manually which is used as signal for the later demodulation (see figure 1)


Figure 1: Settings of the AUX OUT

2. AUX OUT 2, 3, 4 are set to demodulators X 2, 3, 4 and  the the amplitude of the sinusoidal signal can be adjusted with the scale.

3. In figure 2 you see the settings for setting the oscillator frequency. Signal Input of demodulators 2, 3, 4 is set to Aux Out 1.

4. Further the demodulator filter (low-pass filter) needs to be adapted to the oscillator frequency.

Figure 2: Lock-in Tab for Oscillator and demodulator settings

5. AUX OUT 2, 3, 4 are generating different sinusoidal signals with different frequencies


The MFLI is able to output low frequency sinusoidal signal on the AUX OUT with the MD-multi-demodulator option. In total it is possible to output 4 different sinusoidal signal with one MFLI lock-in amplifier:

  • 3 low frequency sinusoidal signals on the AUX OUT
  • 1 high frequency sinusoidal signal on the Signal Output.

Users should keep in mind that the AUX output should only be used for low frequencies. For further information please contact our support team.