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Message ID: 6908     Entry time: Tue Jul 3 18:58:14 2012
Author: Yaakov 
Type: Update 
Category: STACIS 
Subject: More transfer functions and netGPIB status 

I'm still having issues with the STACIS oscillating uncontrollably with the slightest extra vibration, but with some more added weight both x and z direction are stable if you don't disturb the setup.

I took more transfer functions of the STACIS. In the last data I took Jenne pointed out that the geophone signals were not correlated well with the driving signal, so I increased the amplitude of the driving signal and am looking in x and y too instead of just z. 

Details of the driving signal: 25 mV, swept sine from 0.1 to 100 Hz from the SR785. 

NOTE: The data below was all transferred from the SR785 using netGPIB, which works fine, if anyone was interested in using it.

Open loop in the y direction, taken with the y geophone (magnitude on top, phase on bottom):

geo_open_y.png

Open loop in the x direction, taken with the x geophone (with some extra weight to try to make the closed loop more stable):

 geo_open_x.png

Open loop in the x direction, taken with accelerometer instead of geophone:

accel_open_x.png

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