900CT Datasheet, PDF (6/19 Pages) Frequency Devices, Inc. – Tunable Active Filter Instrument

Models 900CT & 900BT
Single Channel – Certified
8 Pole
Low Pass Filters
Model
Transfer Function
900L8B
8-Pole
Butterworth
900L8L
Filter Specifications
8-Pole
Bessel
900L8E
8-Pole, 6 zero
Elliptic
Range fc, fr
0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz
Theoretical Transfer Appendix A
Characteristics Page 9
Appendix A
Page 4
Appendix A
Page 24
Tuning Resolution
Passband Ripple
1 part in 499
within each decade
0.0 dB
1 part in 499
within each decade
0.0 dB
1 part in 499
within each decade
±0.035 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.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
Stopband
Attenuation
48 dB/Octave
48 dB/Octave
-80 dB typ.
Cutoff Frequency
Accuracy
fc
±2% max.
±0.5% typ.
±2% max.
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
-360°
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-182°
±0.01%/°C typ.
±0.02%/°C max.
-0.035 dB
-323°
Filter Attenuation
(theoretical)
0.12 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
1.00 fc
2.37 fc
3.16 fc
1.91 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
1.00 fc
4.52 fc
6.07 fc
0.35 dB
3.01 dB
60.0 dB
80.0 dB
1.00 fr
1.13 fr
1.67 fr
1.77 fr
Total Harmonic
Distortion @ 1 kHz
<-90 dB typ.
<-90 dB typ.
<-90 dB typ.
Wide Band Noise
(5 Hz – 2 MHz)
200µV_rms typ.
200µV_rms typ.
250µV_rms typ.
Narrow Band Noise
(5 Hz – 100 kHz)
50µV_rms typ.
50µV_rms typ.
75µV_rms typ.
900L8EY
8-Pole, 6 zero
Elliptic
0.1 Hz to 49.9 kHz
Appendix A
Page 25
1 part in 499
within each decade
-0.05 dB
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
-100 dB typ.
fc
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-0.05 dB
-419°
0.05 dB
3.01 dB
60.0 dB
80.0 dB
1.00 fr
1.06 fr
1.83 fr
2.00 fr
<-88 dB typ.
250µV_rms typ.
75µV_rms typ.
6
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