900CT Datasheet, PDF (7/19 Pages) Frequency Devices, Inc. – Tunable Active Filter Instrument

Models 900CT & 900BT
Single Channel – Certified
8 Pole
Low Pass Filters
Model
Transfer Function
900L8D80
Filter Specifications
8-Pole, 6 zero
Constant Delay
900L8D10
8-Pole, 6 zero
Constant Delay
Range fc
0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz
Theoretical Transfer Appendix A
Characteristics
Page 21
Appendix A
Page 22
Tuning Resolution
Passband Ripple
1 part in 499
within each decade
0.15 dB
1 part in 499
within each decade
0.15 dB
Pass Band Voltage
Gain
(non-inverting)
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
Stopband Attenuation -80 dB typ.
-100 dB typ.
Cutoff Frequency
Accuracy
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
Stability
Amplitude
Phase
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-306°
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-311°
Filter Attenuation
(theoretical)
3.01 dB
60.0 dB
80.0 dB
1.00 fc
3.08 fc
3.57 fc
3.01 dB
80.0 dB
100.0 dB
1.00 fc
4.45 fc
5.20 fc
Total Harmonic
Distortion @ 1 kHz
Wide Band Noise
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
<-90 dB typ.
200µV_rms typ.
50µV_rms typ.
<-88 dB typ.
200µV_rms typ.
50µV_rms typ.
7
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