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