#+TITLE: Measurements

* Measurement of the slip-ring noise when turning

Voltage amplifier:
- 60db
- AC
- 1kHz

Additionnal LPF at 1kHz

- meas30: All off
- meas31: Slip-ring on
- meas32: slip-ring 6rpm
- meas33: slip-ring 60rpm

Channel 1: direct
Channel 2: slip-ring

* Measuremeent of the noise of the slip-ring when turned ON using geophones

Voltage amplifier:
- 60db
- AC
- 1kHz

Additionnal LPF at 1kHz

- meas35: All off
- meas36: slip-ring ON

geophone at the sample location
slit into 2 BNC:
- first one (column one): direct wire
- second one (second column): slip-ring wire

Each of the signal is amplified by voltage amplifier:
- 60db
- AC
- 1kHz

Additionnal LPF is added before the voltage amplifiers

* Measure of the ground and marble velocity

One geophone is located on the marble, the other one on the floor.

col1: floor
col2: marble

Each of the signal is amplified by voltage amplifier:
- 60db
- AC
- 1kHz

- meas 37: Z direction
- meas 38: N direction
- meas 39: E direction

* Measure of the vibration when rotating the Slip-ring and Ty

All the stages are OFF except Ty and Slip-Ring.

Each of the signal is amplified by voltage amplifier:
- 40db!!!
- AC
- 1kHz

col1: marble
col2: sample

Rotating the slip-ring at 60rpm and scans with the Ty at 1Hz.
Everything on the Z direction

- meas 50: Rz at 1Hz, Ty OFF
- meas 51: Rz at 1Hz, Ty ON (The current and cnt error of Ty is also registered)
- meas 52: Rz at 1Hz, Ty 1Hz 600000cnt

* Measure of the vibration induced by Ty motion

One geophone at the sample position
One geophone on the marble

Each of the signal is amplified by voltage amplifier:
- 40db!!!
- AC
- 1kHz

col1: marble
col2: sample

Ty Scans:
- sin @ 1Hz with amplitude = 600 000 cnt (= 3mm)

- meas 40: Z direction
- meas 41: E direction
- meas 42: E direction without any motion (Ty OFF)