34AData.pdf

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“Quality” in Test and Measurement Since 1949
DC Source/Calibrators, Tunable Electronic Filters,
Wideband Power Amplifiers
Precision Phasemeters, Distortion Analyzers
Function Generators, RC Oscillators
Model 34A
Dual Channel Butterworth/Bessel
Plug-In Filter Card
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Cutoff Frequency Range:
3Hz to 2MHz
Attenuation:
24dB/Octave
Functions:
LP/HP/BP/BR
Selectable Filter Types:
Butterworth and Bessel
Selectable Input Gain:
0dB or 20dB
Selectable Output Gain:
0dB or 20dB
Stopband Attenuation:
>95dB
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.
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.
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.
MAINFRAME CHASSIS
The 34A is a plug-in filter card for two mainframe chassis; Models
3905B/3905C and 3916B. The 3905B/C is a 3.5" 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.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
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34AData.vp
Dual Channel Butterworth/Bessel Plug-In Filter Card
Model 34A
SPECIFICATIONS
Specifications apply at 25°C, ±5°C.
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.
OUTPUT CHARACTERISTICS
Impedance:
50 ohms.
Gain (post-filter):
0dB or 20dB ±0.2dB.
Maximum Voltage:
±6.5V peak into
£500
ohms; ±1.3V
peak into
£50
ohms.
Maximum Current:
±25mA.
Distortion:
–80dB at 1kHz at 1Vrms.
Noise:
<200µV with 2MHz bandwidth detector.
DC Offset:
adjustable to 0V.
DC Stability:
Typically ±0.5mV/°C; ±1mV/°C max.
GENERAL
Input/Output Connectors:
BNC.
Weights:
1.75 lbs (0.8kg).
Accessories:
Operating manual.
OPTIONS
002:
Lowers cutoff range to 0.3Hz to 200kHz.
Extended 1 Year Warranty:
Part No. EW34A.
Specifications subject to change without notice.
NOTE:
Model 34A Series plug-in filter/amplifier cards must
be used with 3905B/3905C or 3916B/3916C chassis.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
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34AData.vp

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