tdehaeze/nass-micro-station-measurements
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
563e827d01
nass-micro-station-measurem.../slip-ring-electrical-noise
History
Thomas Dehaeze 7b5c8455a2 Add all the data (.zip files). 
This is done in order for people to be able to have all the data and scripts
used for analysis.
2019-07-05 11:28:30 +02:00
..
data Add all the data (.zip files). 2019-07-05 11:28:30 +02:00
figs Update analysis of slip-ring noise 2019-05-17 09:50:53 +02:00
img Deleted some mat files, finished the slip of the slip-ring measures 2019-05-16 13:40:35 +02:00
mat Deleted some mat files, finished the slip of the slip-ring measures 2019-05-16 13:40:35 +02:00
matlab Deleted some mat files, finished the slip of the slip-ring measures 2019-05-16 13:40:35 +02:00
index.html Update html file 2019-05-17 10:04:35 +02:00
index.org Update analysis of slip-ring noise 2019-05-17 09:50:53 +02:00
readme.org Renamed one folder. Add analysis of vibrations when rotating 2019-05-14 10:22:57 +02:00

readme.org

DONE Measure of the noise of the Voltage Amplifier

CLOSED: [2019-05-06 lun. 09:00]

  • The two inputs (differential) of the voltage amplifier are shunted with 50Ohms
  • The AC/DC option of the Voltage amplifier is on AC
  • The low pass filter is set to 1hHz

Measure: Second Column

meas3: Ampli OFF meas4: Ampli ON 20dB meas5: Ampli ON 40dB meas6: Ampli ON 60dB meas7: Ampli ON 80dB

DONE Measure of the noise induced by the Slip-Ring

CLOSED: [2019-05-06 lun. 09:28] Setup:

  • 0V is generated by the DAC of the Speedgoat
  • Using a T, one part goes to ADC
  • the other part goes to the slip-ring 2 times and then to the ADC
  • Gain of the Voltage Amplifier: 80dB, AC, 1kHz
  • Everything is OFF

We had some diffuculties to not have a lot of noise on the measurement.

First column: Direct measure Second column: Slip-ring measure

Measurements:

  • meas8: Slip-Ring OFF
  • meas9: Slip-Ring ON
  • meas10: Slip-Ring ON and omega=6rpm
  • meas11: Slip-Ring ON and omega=60rpm

DONE Measure of the noise induced by the slip ring when using a geophone

CLOSED: [2019-05-06 lun. 09:28] The geophone is located at the sample location The two Voltage amplifiers have the following settings:

  • AC
  • 60dB
  • 1kHz

The signal from the geophone is split into two using a T-BNC. On part goes directly to the voltage amplifier and then to the ADC. The other part goes to the slip-ring=>voltage amplifier=>ADC.

The other two cables that go through the slip ring have 50Ohms resistors at one end, the other end is open circuit.

First column: Direct measure Second column: Slip-ring measure

  • meas12: Slip-Ring OFF
  • meas13: Slip-Ring ON

Redone the measurements with 1kHz additional low pass filter:

  • meas16: Slip-Ring OFF
  • meas17: Slip-Ring ON

DONE Measure of the influence of the AC/DC option on the voltage amplifiers

CLOSED: [2019-05-06 lun. 09:28] One geophone is located on the marble. It's signal goes to two voltage amplifiers with a gain of 60dB. On voltage amplifier is on the AC option, the other on the DC option.

First column: AC Second column: DC

  • meas14: col-1 = amp1+AC. col-2 = amp2+DC.
  • meas15: col-1 = amp1+DC. col-2 = amp2+AC.

Measurement of the LPF

We are measuring the signal from from Geophone with a BNC T On part goes to column 1 through the LPF The other part goes to column 2 without the LPF

  • meas18

New measurement with C = 150nF => fc = 1kHz Voltage Ampli: 60dB, DC, 1kHz

  • meas19

Measure of the noise induced by the Slip-Ring - BIS

Same as before but with a LPF

Measurements:

  • meas20: Slip-Ring OFF
  • meas21: Slip-Ring ON
  • meas22: Slip-Ring ON and omega=6rpm
  • meas23: Slip-Ring ON and omega=60rpm