Model 3384 Four Channel 8-Pole Adjustable Frequency Filter

1 Krohn-Hite Model 3384 Four Channel 8-Pole Adjustable Frequency Filterdescription

Krohn Hite has been famous since 1949, Krohn-Hite Model 3384 Four Channel 8-Pole Adjustable Frequency FilterIt has simple operation, high reliability, and a price that can be accepted by the public.

The four independent channels of the 3384 model provide a coordinated frequency range from 0.1Hz to 200kHz. By using option 002, the range can be extended down to 0.005Hz. The frequency response characteristics can be selected to be the flattest passband in the frequency domain for clean filtering (Butterworth filter) or linear phase for providing excellent pulses or complex filtering (Bessel filter).

The 3384 model also offers optional low-pass and high pass 8-pole filtering for each channel, with a selectable input gain of 50dB (10dB step size) and output gain of 20dB (0.1dB step size). The 3384 model can accept a peak signal of ± 10V with a gain of 0dB and has optional AC or DC coupling. Memory can be used to store instrument settings that can be called up with simple commands.

2、 Bandpass/Bandstop Operation

Using the 3384 model, users can simply connect two channels in series to achieve bandpass operation or connect two channels in parallel for bandstop operation. There are a total of two bandpass/bandstop channels available in 3384.

3、 Application

Model 3384 is applied in anti aliasing, ultrasound measurement, random noise testing, recording, suppression of interference in audio communication, as well as related fields such as medical, geological, geophysical, oceanographic, military, etc.

4、 Specifications

Specification suitable for 25 ℃± 5 ℃

5、 Function

Low pass filter, high pass filter. Provide two channels, bandpass or bandstop, through external connections.

6、 Filter characteristics

Type: 8-pole, optional Butterworth and Bessel

Attenuation slope: 48dB/octave band

Tunable frequency range fc: 0.1Hz to 200kHz (option 002, 0.005Hz)

Frequency resolution: 0.001Hz between 0.1Hz and 0.999Hz,; 3-digit, 1Hz to 200kHz, (Option 002, with a step size of 0.001Hz from 0.005Hz to 0.009Hz).

Cut off frequency accuracy: ± 3%

Corresponding gain at point fc: -3dB, Butterworth; –12.6dB， Bessel

High pass bandwidth (0dB gain):>2MHz

Bandstop attenuation:>80dB

Bandwidth noise (2MHz bandwidth detector):<400 µ Vrms at 0dB gain,<25 µ Vrms RTI at gain peak.

Harmonic distortion (1V input, 0dB gain): -60dB (0.1%) to 10kHz; -50dB (0.3%) to 100kHz.

DC stability: typical value is ± 1mV/℃

Input: differential mode or single ended mode

Pre filter gain: 0dB, 10dB, 20dB, 30dB, 40dB, 50dB, ± 0.2dB

Impedance: 1M Ω parallel 25pf

Input peak: The peak voltage is ± 10V at 0dB gain, which decreases proportionally to the gain setting.

CMRR: greater than 60dB at 10kHz; greater than 50dB at 100kHz.

Coupling: AC coupling (0.16Hz) or AC coupling

Sensitivity: For a peak output of 10V, the peak is 3mV at a total gain of 70dB

Peak value of DC component: ± 100V in AC coupling mode

output:

Post filter gain: Gain in 0.1dB steps up to 0dB to 20dB, ± 0.2dB

Voltage (open-loop) peak value: ± 10V

Peak current: ± 80mA

Impedance: 50 Ω

DC offset: adjustable to zero voltage

7、 Conventional

Interference between channels (-70dB when input source<50 200kHz='' fsig=''>200kHz)

Memory: 9 storage settings

Self check diagnosis: The MPU checks the unit when powered on, and the display screen indicates the fault mode.

Display: 7-segment, green, LED； 0.3 inches high

Working temperature: 0 ℃ to 50 ℃

Chassis isolation: ± 200Vdc

Input/output connector: BNC

Power requirements: 90-132/180-264V AC, 50Hz-400Hz, 10W (3361), 15W (3362), 30W (3364)

Size and weight: 3.5 inches (9cm) high, 14 inches (36cm) wide, 12.5 inches (32.13cm) deep; 12 pounds (5.4kg) net weight, 14 pounds (6.3kg) total weight

Attachment: Three terminal power cord; Operation Manual

8Four channel 8-pole filteroptional

002: Extend the extremely low cut-off frequency to 0.005Hz

BK-330: Line/battery power supply

Rack installation kit: part number RK-314, allows installation of 3384 model into a standard rack spacing of 19 feet.

Extended 1-year warranty: Part number EW3384

9、 Optional attachments

CAB-025: Cable, BNC， 3 feet, low noise

The manual is subject to change without prior notice.