Wavetek 452 Instruction Manual

138
MODELS 452/452-01 & 852/852-01
Dual HI/LO Variable Analog Filters
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Design
The Models 452 and 852 Dual
Filters each consist of two identical
filter channels contained in a com­
mon cabinet. Each filter channel has
separate input/output
offers high pass
0
functions, dB and 20 dB gain,
Butterworth/Flat Delay
and 3-digit resolution for cutoff fre­
quency selection.
Versatility
Individual channels may be readily
interconnected for series or parallel
operation, resulting in bandpass (or
doubled rolloff) and
functions respectively.
Frequency Range:
Resolution: Digits
3
Cutoff Frequency Accuracy:
Responses: Butterworth and Flat Delay
Dynamic Range:
Low Noise
Each filter channel provides switch
selectable Flat Amplitude (Butter­
H
I/LO
worth)
domain applications and Flat Delay
response
domain applications.
terminals,
and low pass
The Models 452 and 852 are elec­
trically
responses
each covering the cutoff frequency
range of
the Model 452 is 24 dB/octave/
channel, while the Model 852 is 48
dB/octave/channel.
installed Option
cutoff frequency range and resolu­
tion on the Models 452 and 852 to
band reject
0.01 Hz.
SIGNAL PROCESSING FILTERS
to
0.01 Hz 111 kHz
20/0
+
dB
90
response for frequency
for transient-free time
and mechanically similar,
0.1 Hz 111 kHz.
to Rolloff of
The factory
01
will extend the
Implementation
Frequency determining
elements of the filters are stable
precision metal film resistors and
close tolerance polycarbonate
mica film capacitors. The
elements are FET-input le operational
amplifiers which provide highly stable
gain, and very low noise and distor­
tion. This combination of active and
passive elements produces a filter
having high cutoff frequency
curacy and resettability,
temperature stability and long term
stability. Another result of precise
control of frequency-determining
elements is close amplitude
phase match between channels.
passive
or
active
ac­
excellent
and