Models 900CT & 900BT

8 Pole

Single Channel –

Certified

Low Pass Filters

7

1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176

e-mail: sales@freqdev.com

• Web Address: http://www.freqdev.com

Model

900L8D80

900L8D10

Filter Specifications

Transfer Function

8-Pole, 6 zero

Constant Delay

8-Pole, 6 zero

Constant Delay

Range fc

0.1 Hz to 49.9 kHz

0.1 Hz to 49.9 kHz

Theoretical Transfer

Characteristics

Appendix A

Page 21

Appendix A

Page 22

Tuning Resolution

1 part in 499

within each decade

1 part in 499

within each decade

Passband Ripple

0.15 dB

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

fc

±2% max.

fc

±2% max.

Accuracy

±0.5% typ.

±2% max.

±0.5% typ.

±2% max.

Stability

±0.01%/°C typ.

±0.02%/°C max.

±0.01%/°C typ.

±0.02%/°C max.

Amplitude

-3 dB

-3 dB

Phase

-306

°

-311

°

Filter Attenuation

3.01 dB

1.00 fc

3.01 dB

1.00 fc

(theoretical)

60.0 dB

3.08 fc

80.0 dB

4.45 fc

80.0 dB

3.57 fc

100.0 dB

5.20 fc

Total Harmonic

Distortion @ 1 kHz

<-90 dB typ.

<-88 dB typ.

Wide Band Noise

(5 Hz – 2 MHz)

200

µV

200

µV

Narrow Band Noise

(5 Hz – 100 kHz)

50

µV

50

µV