Models 900CT & 900BT

8 Pole

Single Channel –

Certified

High Pass Filters

8

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

900H8B

900H8E

900H8EY

Filter Specifications

Transfer Function

8-Pole

Butterworth

8-Pole, 6 zero

Elliptic

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

Characteristics

Appendix A

Page 29

Appendix A

Page 37

Appendix A

Page 38

Tuning Resolution

1 part in 499

within each decade

1 part in 499

within each decade

1 part in 499

within each decade

Passband Ripple

0.0 dB

±0.035 dB

-0.05 dB

Pass Band Voltage

Gain

(non-inverting

)

0

± 0.2 dB to.100kHz

0

± 0.5 dB to 120kHz.

0

± 0.2 dB to.100kHz

0

± 0.5 dB to 120kHz.

0

± 0.2 dB to.100kHz

0

± 0.5 dB to 120kHz.

Powert Bandwidth

120 kHz

120 kHz

120 kHz

Stopband

Attenuation

48 dB/Octave

-80 dB typ.

-100 dB typ.

Cutoff Frequency

fc

±2% max.

fc

±2% max.

fc

±2% max.

Accuracy

±0.5% typ.

±2% max.

±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.

±0.01%/°C typ.

±0.02%/°C max.

Amplitude

-3 dB

-0.035 dB

-0.5 dB

Phase

-360

°

-323

°

-419

°

Filter Attenuation

80.0 dB

0.31 fc

80.0 dB

0.56 fr

100.0 dB

0.50 fr

(theoretical)

60.0 dB

0.42 fc

60.0 dB

0.60 fr

80.0 dB

0.55 fr

3.01 dB

1.00 fc

3.01 dB

0.88 fr

3.01 dB

0.94 fr

0.00 dB

2.00 fc

0.03 dB

1.00 fr

0.03 dB

1.00 fr

0.00 dB

2.00 fr

0.00 dB

2.00 fr

Total Harmonic

Distortion @ 1 kHz

<-88 dB typ.

<-88 dB typ.

<-88 dB typ.

Wide Band Noise

(5 Hz – 2 MHz)

400

µV

400

µV

500

µV

Narrow Band Noise

(5 Hz – 100 kHz)

100

µV

100

µV

150

µV