Model 3384 - Krohn
DC Source/Calibrators, Tunable Electronic Filters,
Wideband Power Amplifiers
Precision Phasemeters, Distortion Analyzers
Function Generators, RC Oscillators
“Quality” in Test and Measurement Since 1949
Model 3384
0.1Hz to 200kHz
Four Channel 8-Pole Filter
• Four Independent Filter Channels
Two Independent Band-Pass Channels
Attenuation: 48dB/Octave
Functions: High-Pass, Low-Pass, Band-Pass
Response: Butterworth and Bessel
Input: Differential and Single-Ended
Input Gain: 0dB to 50dB in 10dB steps
Output Gain: 0dB to 20dB in 0.1dB steps
The Krohn-Hite Model 3384 Four Channel Filter provides ease of
operation and the reliability Krohn-Hite has been known for since
1949; along with a price that will fit any budget.
The 3384 four independent channels provide a tunable frequency
range from 0.1Hz to 200kHz; and with the 002 option, the range is
extended to 0.005Hz. The frequency response characteristic is
selectable to either maximally flat (Butterworth) for clean filtering
in the frequency domain, or linear phase (Bessel) for complex
Low-Pass Amplitude Response
Each channel of the 3384, also offers selectable functions of
low-pass and high-pass 8-pole filtering with selectable input gains
to 50dB in 10dB steps, and output gains to 20dB selectable in
0.1dB steps. The 3384 will accept input signals to ±10V peak at
0dB gain and has selectable ac or dc coupling. Memory is
available for storing a set-up of the instrument which can be
recalled with a simple command.
With the Model 3384 the user can simply connect two channels in
series to achieve band-pass operation or connect the two in
summed parallel for band-reject operation. A total of two
band-pass/band-reject channels are available in the 3384.
Applications of the Model 3384 are anti-aliasing, ultra-sound
measurements, random noise testing, sound recording,
High-Pass Amplitude Response
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989;; email:
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0.1Hz to 200kHz Four Channel Filter
suppressing interference in audio communications and related
fields of medical, geological, geophysical, oceanographic,
military and many more.
Model 3384
Specifications apply at 25°C, ±5°C.
Post-Filter Gain: 0dB to 20dB in 0.1dB steps, ±0.2dB.
Low-pass filter, high-pass filter. Provides two channel of
band-pass or band-reject via external connections.
Maximum Current: ±80mA peak.
Type: 8-pole, selectable Butterworth and Bessel.
Maximum Voltage (open circuit): ±10V peak.
Impedance: 50 ohms.
DC Offset: Adjustable to zero volts.
Attenuation Slope: 48dB/octave.
Crosstalk Between Channels ( input source £50 ohms):
–80dB for fsig £200kHz, –70dB for fsig >200kHz.
Tunable Frequency Range fc: 0.1Hz to 200kHz; (option
002, 0.005Hz).
Memory: 9 stored set-ups.
Frequency Resolution: 0.001Hz, 0.1Hz to 0.999Hz; 3
Digits, 1Hz to 200kHz, (option 002, 0.001Hz from 0.005Hz
to 0.1Hz).
Self-Test Diagnostics: MPU checks unit upon power-up.
Display indicates failure mode.
Displays: 7 segment, green, LED; 0.3" high.
Cutoff Frequency Accuracy: ±3%.
Operating Temperature: 0°C to 50°C.
Relative Gain at fc: –3dB, Butterworth; –12.6dB, Bessel.
Isolation to Chassis: ±200Vdc.
High-Pass Bandwidth (0dB Gain): >2MHz.
Input/Output Connectors: BNC.
Stopband Attenuation: >80dB.
Power Requirements: 90-132/180-264 volts ac,
50Hz-400Hz, 10 watts (3361), 15 watts (3362), 30 watts
Wideband Noise (2MHz bandwidth detector): 0dB gain,
<400µVrms. Max. gain, <25µVrms RTI.
Harmonic Distortion (1V input, 0dB gain): –60dB (0.1%)
to 10kHz; –50dB (0.3%) to 100kHz.
Dimensions and Weights: 3.5“ (9cm) high, 14" (36cm)
wide, 12.5” (32.13cm) deep; 12 lbs (5.4kg) net, 14 lbs
(6.3kg) shipping.
DC Stability: Typically ±1mV/°C.
Accessories: 3-terminal line cord; operating manual.
Input: Differential or single-ended.
002: extends low end cutoff to 0.005Hz.
Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB, 50dB,
Impedance: 1 megohm in parallel with 25pf.
BK-330: Line/battery operation.
Maximum Input: ±10V peak at 0dB gain, reduced in
proportion to gain setting.
Rack Mount Kit: Part No. RK-314, permits installation of
the Model 3384 into a standard 19" rack spacing.
CMRR: >60dB to 10kHz; >50dB to 100kHz.
Extended 1 Year Warranty: Part No. EW3384.
Coupling: ac (0.16Hz) or dc.
CAB-025: Cable, BNC, 3ft, Low Noise
Sensitivity: 3mV peak with 70dB total gain for 10V
peak output.
Maximum DC Component: ±100V in ac coupled
Specifications subject to change without notice.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989;; email:
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