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| == LVDT Drivers used for the Type B suspensions == | == Type A == Your data here! == Type B Data == === LVDT Drivers Data === |
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| == Yoke Height Settings == | === Yoke Height Settings === |
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| === Bottom Filter (BS and SRx) === | ==== Bottom Filter (BS and SRx) ==== |
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| === Summary === | ==== Summary ==== |
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== Type Bp Data == Your data here! |
KAGRA VIS Operations Manual - LVDT
LVDTs are used for vertical sensing and actuation in all the GAS filters and for horizontal sensing and actuation in all the IP stages.
See LVDT Signal Conditioning for useful background on LVDT demodulation.
See JGW-T1201255 for description of the Nikhef-supplied cards, and JGW-T1604798 for more information on how to tune the demodulation circuit.
Summary of LVDTs Calibration Procedure(JGW-E1707287). Here: LVDT Calibration Procedure.
Type A
Your data here!
Type B Data
LVDT Drivers Data
For SR2:
LVDT Driver S.N. |
Left card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
Right card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
SR2: SN 7777777 |
R0 |
BF GAS |
59.2 |
4. Vpp |
4./5.02 = 0. |
R0 |
PI LVDT#1 |
50.1 |
4. Vpp |
4./5.02 = 0. |
R1 |
SF GAS |
36.3 |
4. Vpp |
4./5.02 = 0. |
R1 |
PI LVDT#2 |
50.6 |
4. Vpp |
4./5.02 = 0. |
|
R2 |
F0 GAS |
59.6 |
4. Vpp |
4./5.02 = 0. |
R2 |
PI LVDT#3 |
51.2 |
4. Vpp |
4./5.02 = 0. |
|
R3 |
Not used |
59.5 |
4. Vpp |
4./5.02 = 0. |
R3 |
Not used |
50.0 |
4. Vpp |
4./5.02 = 0. |
For SR3:
LVDT Driver S.N. |
Left card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
Right card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
SR3: SN 1807783 |
R0 |
BF GAS |
60.0 |
4.90 Vpp |
4.90/5.02 = 0.976 |
R0 |
PI LVDT#1 |
50.7 |
4.90Vpp |
4.90/5.02 = 0.976 |
R1 |
SF GAS |
60.7 |
4.86 Vpp |
4.86/5.02 = 0.968 |
R1 |
PI LVDT#2 |
50.7 |
4.88 Vpp |
4.88/5.02 = 0.972 |
|
R2 |
F0 GAS |
60.9 |
4.86 Vpp |
4.86/5.02 = 0.968 |
R2 |
PI LVDT#3 |
50.0 |
4.88 Vpp |
4.88/5.02 = 0.972 |
|
R3 |
Not used |
60.7 |
4.86 Vpp |
4.86/5.02 = 0.968 |
R3 |
Not used |
50.9 |
4.86 Vpp |
4.86/5.02 = 0.968 |
For SRM:
LVDT Driver S.N. |
Left card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
Right card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
SRM: SN 1807786 |
R0 |
BF GAS |
60.6 |
5.04 Vpp |
5.04/5.04 = 1.0 |
R0 |
PI LVDT#1 |
50.0 |
5.0 Vpp |
5.0/5.04 = 0.992 |
R1 |
SF GAS |
60.1 |
4.96 Vpp |
4.96/5.04 = 0.984 |
R1 |
PI LVDT#2 |
50.0 |
4.92 Vpp |
4.92/5.04 = 0.976 |
|
R2 |
F0 GAS |
60.7 |
4.96 Vpp |
4.96/5.04 = 0.984 |
R2 |
PI LVDT#3 |
50.5 |
4. Vpp |
5.0/5.04 = 0.992 |
|
R3 |
Not used |
61.2 |
4.94 Vpp |
4.94/5.04 = 0.98 |
R3 |
Not used |
50.8 |
4. Vpp |
4.9/5.04 = 0.972 |
Yoke Height Settings
The yoke should be set so that the double and single LVDT coils are symmetrically aligned when the keystone is at nominal height. It is convenient to set this in terms of the amount the PEEK coil former sticks out above the filter baseplate.
Bottom Filter (BS and SRx)
Note that the CAD is wrong for the bottom filter yoke:
Standard Filter (BS and SRx)
Summary
GAS Filter |
Yoke Height |
Keystone Height |
BS BF |
3.5 mm |
65.5 mm |
SR BF |
3.5 mm |
65.5 mm |
BS SF |
6 mm |
65.5 mm |
SR SF |
6 mm |
65.5 mm |
Type Bp Data
Your data here!