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IOO (IMC)
kenta.tanaka - 14:47 Wednesday 08 October 2025 (35273) Print this report
implementation of remote monitors for IMC error signal and IMC EOM feedback signal

To monitor an IMC error signal and an IMC EOM feedback signal until 1MHz remotely, we connected Moku:lab to IMC-SERVO_OUT2 port and Miyoki-san's osciloscope to the output of a 2nd HV amp output for EOM.

As for the IMC error signal, we put a SR560 before the Moku:lab and amplified the signal with the SR560 by x10.

(Note: Before our work, the cable on IMC-SERVO_OUT2 port was already disconncting...)

As for the EOM feedback signal, we inserted a T connecter between the 2nd HV amp and EOM, then we connected the channel 2 port of the oscilloscope to the one port of the T connecter. The input impedance of the channel 2 is set to 1 MOhm. According to the note on the oscilloscope, This oscilloscope can be received by 300 Vrms when the input impedance is 1 MOhm.This range is large enough to receive the HV amp output, +/- 100V.

We can begin to monitor their signals remotely. (if you want IP adresses of the Moku and the oscilloscope, please ask their experts, respectively)

Comments to this report:
takafumi.ushiba - 18:38 Wednesday 08 October 2025 (35281) Print this report

Figure 1 shows the spectrum of IMC error signals from 10kHz to 10MHz.
Very large peak can be seen at 1.2MHz.

Figure 2 shows the spectrum from 10kHz to 700kHz.
Many stracture can be seen from 60kHz to 400kHz.

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