The 3380 Series Family
Model 3381 -
Single Channel with selectable HP/LP
Butterworth/Bessel
Model 3382 -
Dual Channel with selectable HP/LP/BP Butterworth/Bessel
Model 3384 -
Four Channel with selectable HP/LP/BP Butterworth/Bessel
Features
Attenuation:
48dB/Octave
Filter Mode:
Selectable
Low-Pass and High-Pass
Response:
Selectable
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
Battery Option
Options 002:
Lowers low end cutoff
to 0.005Hz. BK-330: Line/battery
operation, Model
3382 only. Rack Mount Kit: Part No.
RK-314, permits
installation
of the Model 3380 Series
into
a
standard
19"
rack
spacing. Extended 1 Year Warranty:
Part No. EW3381, EW3382
or EW3384
DESCRIPTION The Krohn-Hite Model 3380 Filter Series are one, two or four
channel filters providing ease of
operation
and the
reliability Krohn-Hite has been known for since 1949;
along with a price that
will fit any
budget.
The 3380
Series provides 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) to provide
superior
pulse for complex filtering.
Each
channel of the 3380 Series is a selectable low-pass or
high-pass, 8-pole filter providing an
input
gain to 50dB,
and an output gain to 20dB selectable in 0.1dB steps. The
3380 Series 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.
BAND-PASS/BAND-REJECT
OPERATION With the
Model 3382 and 3384 models, the user can simply connect two
channels in series to achieve
band-pass
operation or two
summed in parallel for band-reject operation.
APPLICATIONS Applications
of the Model 3380 are anti-aliasing, ultra-sound
measurements, random noise testing,
sound
recording,
suppressing interference in audio communications and
related fields of medical,
geological,
geophysical,
oceanographic, military and many more.
SPECIFICATIONS
The following
specifications apply to each channel.
FUNCTIONS Low-pass
filter, high-pass filter. 2 and 4 channel models provide
one and two channel(s)
respectively
of
band-pass or
band-reject via external connections.
NUMBER
OF CHANNELS
Model
Channels
3381
1
3382
2
3384
4
FILTER CHARACTERISTICS Type:
8-pole, Butterworth/Bessel. Attenuation Slope: 48dB/octave. Tunable Frequency Range fc:
0.1Hz to 200kHz; (option 002, 0.005Hz). Frequency Resolution:
0.001Hz, 0.1Hz to 0.999Hz; 3 Digits, 1Hz to 200kHz, (option 002, 0.001Hz
from 0.005Hz to 0.1Hz). Cutoff Frequency Accuracy: ±3%. Relative Gain at fc:
–3dB, Butterworth; –12.6dB, Bessel. High-Pass Bandwidth (0dB Gain): >2MHz. Stopband Attenuation: >80dB. Wideband Noise (2MHz bandwidth detector): 0dB
gain, <300µVrms. Max. gain, <25µVrms RTI. Harmonic Distortion (1V input, 0dB gain): –60dB (0.1%) to
10kHz; –50dB (0.3%) to 100kHz. DC Stability: Typically ±1mV/°C. Input: Differential or
single-ended.
Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB, 50dB,
±0.2dB.
Impedance: 1M ohm in parallel with 25pf.
Maximum Input: ±10V peak at 0dB gain, reduced in
proportion to gain setting.
CMRR: >60dB to 10kHz; >50dB to 100kHz.
Coupling: ac (0.16Hz) or dc.
Sensitivity: 3mV peak with 70dB total gain for 10V peak
output.
Maximum DC Component: ±100V in ac coupled mode.
Output: Post-Filter Gain: 0dB to 20dB in 0.1dB steps,
±0.2dB.
Maximum Voltage (open circuit): ±10V peak.
Maximum Current: ±80mA peak.
Impedance: 50 ohms.
DC Offset: Adjustable to zero volts.
GENERAL
Crosstalk
Between Channels ( input source
£50 ohms): –80dB for
fsig
£200kHz,
–70dB for
fsig >200kHz. Memory: 9 stored set-ups. Self-Test Diagnostics: MPU checks unit upon
power-up. Display indicates failure mode. Displays: 7 segment, green, LED; 0.3" high. Operating Temperature: 0°C to 50°C. Isolation to Chassis: ±200Vdc. Input/Output Connectors: BNC. Power Requirements: 90-132/180-264 volts ac, 50Hz-400Hz, 10 watts
(3381), 15 watts (3382),
30
watts (3384).
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. Accessories: 3-terminal line cord; operating
manual.
OPTIONS 002:
extends low end cutoff to 0.005Hz. BK-330: Line/battery operation, Model 3382 only. Rack Mount Kit: Part No. RK-314, permits
installation of the Model 3380 Series into a standard
19"
rack spacing. Extended 1 Year Warranty: Part No. EW3381, EW3382 or EW3384.
