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可编程滤波器

 

Our remote controlled Tunable Active Filters are analog, GPIB, signal conditioning filters that are digitally controlled via the front panel or over the GPIB interface bus. They are frequency discriminating instruments whose signal transmission characteristics are functions of frequency. Their basic function is to pass wanted signals and suppress unwanted signals, according to frequency. All Krohn-Hite filters provide a combination of reliability, performance and economy.

Other Filter Products
     General Purpose Tunable Filters  |  Signal Conditioning Systems  |  Fixed Frequency Filter Modules  |  Fixed Frequency Filter Systems

SELECTION GUIDE

Model

Model 3900
Elliptic
Filter

Model 3901
Elliptic
Filter

Model 3940
Butterworth/Bessel
Filter

Model 3944
Butterworth/Bessel
Filter

Model 3945
Butterworth/Bessel
Filter

Model 3955
Butterworth
Filter

Model 3988
Butterworth/Bessel
Filter

Remote Controlled Dual Low-Pass Elliptic Filter Model 3900

Remote Controlled 2 Channel Elliptic Filter Model 3901

Remote Controlled 2 Channel Filter Model 3940

Remote Controlled 4 Channel Filter Model 3944

Remote Controlled 3 Channel Filter Model 3945

Remote Controlled Dual Low-Pass Filter Model 3955

Remote Controlled 2 Channel Filter Model 3988

 

 

 

 

 

 

 

Attenuation Rate

115dB/Octave

115dB/Octave

24dB/Octave

24dB/Octave

24dB/Octave

24dB/Octave

48dB/Octave

Independent Channels

2

2

2

4

3

2

2

Cutoff Frequency

1Hz to 99kHz

1Hz to 99kHz

3Hz to 2MHz

3Hz to 2MHz

3Hz to 25.6MHz

170Hz to 25.6MHz

0.03Hz to 1MHz, LP
0.03Hz to 300kHz, HP

Responses

Elliptical

Elliptical

Butterworth, Bessel

Butterworth, Bessel

Butterworth, Bessel

Butterworth

Butterworth

Functions

LP *

LP, HP *

LP, HP, BP, BR *

LP, HP, BP, BR *

LP, HP, BP, BR *

LP *

LP, HP, BP, BR

BP, BR Channels

None

1

1

2

1

None

2

Input Type

SE **, Differential

SE **, Differential

SE **

SE **

SE **

SE **

SE **, Differential

Input Volts

±10V peak

±10V peak

±4.5V peak

±4.5V peak

±4.5V peak

±1.5V peak

±10V peak

Output Volts

±10V peak

±10V peak

±6.5V peak

±6.5V peak

±6.5V peak

±3V peak

±10V peak

Pre-Filter Gain

40dB in 10dB steps

40dB in 10dB steps

20dB

20dB

20dB

20dB

50dB in 10dB steps

Post-Filter Gain

20dB in 10dB steps

20dB in 10dB steps

20dB

20dB

26dB

26dB

20dB in 0.1dB steps

Data Sheet

Data Sheet

Data Sheet

Data Sheet

Data Sheet

Data Sheet

Data Sheet

Data Sheet

Manual

Operating

Operating

Operating

Operating

Operating

Operating

Operating

 *  LP = low-pass, HP = high-pass, BP = band-pass, BR = band-reject; Band-pass and band-reject require 2 channels.  ** SE = Single-Ended

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