>kermit (I used kermit command for serial communication.)
>set modem type none
>set line /dev/ttyS0 (ttyS0 should be the device name of your serial port)
>set speed 9600
>set parity none
>set stop-bits 1
>set flow-control none
We found that one OP-amp used in ISS servo oscillated in 10 MHz, 100mV.
Moreover, we found another OP-amp had big noise.
We guess that these oscilation or noise cause saturation in high frequency, and they effect to lower frequency to cause
Attached files are open loop transfar function of ISS.
The blue points are open loop TF, and the green line is product of TF of ISS servo filter and TF of current shunt TF of servo filter.
This two must be same in principle, but They have difference f<2Hz and f>5kHz.