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nass-micro-station-measurem.../slip-ring-test
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Thomas Dehaeze 7aa568e55d add measure about voltage amplifier AC/DC
2019-05-03 17:23:00 +02:00
..
figs Add data analysis 2019-05-02 14:06:23 +02:00
mat add measure about voltage amplifier AC/DC 2019-05-03 17:23:00 +02:00
analysis.m add slip-ring-noise measurement 2019-04-30 10:38:22 +02:00
index.html Update index.org 2019-05-02 14:12:11 +02:00
index.org Rename folder 2019-05-02 14:09:20 +02:00
readme.org add measure about voltage amplifier AC/DC 2019-05-03 17:23:00 +02:00
run_test.m add measure about voltage amplifier AC/DC 2019-05-03 17:23:00 +02:00
setup.m lot of measurements 2019-05-03 17:07:22 +02:00
slip_ring_test.slx lot of measurements 2019-05-03 17:07:22 +02:00

readme.org

Measure of the noise of the Voltage Amplifier

  • 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

Measure of the noise induced by the Slip-Ring

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

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

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

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

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.