Outputting Low-Frequency Sinusoidal Signals on the AUX Output of the MFLI

May 30, 2017 by Marco Brunner

This blog post shows how to output sinusoidal signals on the AUX Output of the MFLI Lock-in Amplifier with the MF-MD Multi-Demodulator option. Keep in mind that AUX outputs are not designed to output sinusoidal signals as the Signal Output.

 

AuxIO.png

Figure 1: Settings of the AUX 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).

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

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

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

Lockin.png

Figure 2: Lock-in tab for Oscillator and demodulator settings.

The MFLI is able to output low frequency sinusoidal signals on the AUX Output with the MF-MD option. In total it is possible to output 4 different sinusoidal signals with one MFLI:

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

Keep in mind that the AUX Output should only be used for low frequencies. For further information please contact us.