DESCRIPTION
The
Model 34A dual channel, Butterworth/Bessel, plug-in
filter card is one of a family of filter cards
used in Krohn-Hite Programmable Filter System Mainframe Chassis.
It was carefully designed with
the user in mind,
providing ease of operation, reliability and price
competitiveness.
FEATURES
The 34A
provides a tunable cutoff frequency range from 3Hz to
2MHz, with a frequency response
characteristic of
maximally flat (Butterworth) for clean filtering in the
frequency domain, or linear
phase (Bessel) to provide
superior pulse or complex signal filtering. The passband
gain is unity
(standard on all Krohn-Hite filters), and
the attenuation slope is 24dB/octave per channel.
The filter can be programmed to
operate in the low-pass, high-pass, band-pass,
band-reject or by-pass modes; or the two channels can be
externally interconnected to achieve 48dB/octave
high-pass or low-pass slopes. The 34A also offers input
and output gains of 0dB or 20dB.
MAINFRAME
CHASSIS
The 34A is
a plug-in filter card for two mainframe chassis; Models
3905B/3905C and 3916B. The
3905B/C is a 3" high chassis,
allowing up to 5 filter/amplifier cards. The 3916B allows
up to 16
cards. With the Model 34A, this allows the user
to configure either a 10 channel or 32 channel filter
system.
SPECIFICATIONS
FILTER CHARACTERISTICS
Functions: Two independent channels of low-pass,
high-pass or bypass. One channel of
band-pass or
band-reject.
Type:
4-pole Butterworth (maximally flat)
4-pole
Bessel
(linear phase).
Frequency Range (fc): 3Hz
to 2MHz.
Frequency Resolution: 1Hz from 3Hz to 1kHz; 10Hz
to 2kHz; 100Hz to 100kHz;
1kHz to 1MHz; 10kHz to 2MHz.
Frequency Accuracy (fc):
±2% or least significant digit (which ever is greater)
20Hz to 500kHz;
±5% to 2MHz.
Relative Gain at fc:
Butterworth: –3dB.
Bessel: –7.58dB.
Bandwidth: dc to fc, dc coupled; 0.2Hz
to fc, ac coupled (low-pass); fc to
10MHz (high-pass).
Attenuation: 24dB/octave per channel.
Stopband Attenuation: >80dB.
Insertion Loss (0dB Input/ Output gain): ±0.5dB
to 2MHz.
INPUT CHARACTERISTICS
Gain
(pre-filter): 0dB or 20dB ±0.2dB.
Coupling: ac or dc.
Impedance: 1M ohm in parallel with 100pf.
Maximum Signal (at 0dB gain): ±4.5V
peak at fc <1MHz; ±4V peak at 2MHz.
Maximum DC Component: ±200V in ac coupled mode.
