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Multi lowpass filter
Multiple RC lowpass filters with different cutoff frequencies to switch between.
Application
- Vibration sensitivity measurement
- Errorsignal for Locks
Status
: tested and working, 
: minor issue/not tested, 
: defect
| # | Status | Comment |
|---|---|---|
| 1 | | |
| 2 | | |
| 3 | | |
| 4 | | |
| 5 | |
Setup
Switch: Elma 01-1104 (with gold inside), Farnell # 1876072
\(f_{c}\): cutoff frequency, \(\tau\): time constant, R: resistance, C: capacitance
\[ f_{c} = \frac{1}{2 \pi \tau} \quad with \quad \tau = RC\]
| Cutoff Frequency [Hz ] | Time Constant [ms] | Capacitance [nF] | Capacitor |
|---|---|---|---|
| 4.8 | 33 | 3300 | WIMA 3,3µF 50- F6 |
| 16 | 10 | 1000 | WIMA MKS4 1,0µF 100- |
| 48 | 3.3 | 330 | WIMA MKC4 0.33/100- |
| 160 | 1 | 100 | µ1K100 |
| 480 | 0.33 | 33 | 33nK100 |
| 1600 | 0.1 | 10 | 10nK100 |
Prototype
Multi RC lowpass filters by PTB
