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1. INTRODUCTION
The 2010 Heterodyne Analyzer is an extremely versatile precision instru-
ment for analysis of sound, vibration or voltage over the range 2Hz to
200kHz.
The 2010 is basically a wide range linear measuring amplifier plus a beat
frequency oscillator section, plus a continuously variable heterodyne slave
filter with 6 selectable constant bandwidths.
The measuring amplifier section contains an RMS rectifier, accurate for
signals with crest factor up to 5, with selectable RC effective averaging times
from 0.1 to 100 sees. AC, and linear or logarithmic DC outputs are avail-
able. The lin-log converter allows lin or log meter indication.
The tuning frequency may be controlled mechanically, (for example, by
the Level Recorders 2305 or 2307), or electrically, (for example, by the
2307) permitting the automatic recording of an analysis or a frequency
response.
A log or lin frequency sweep may be selected.
The generator section (B.F.O.) has an output adjustable in 10 dB steps
between 100 J.l.V and 10 Volts and continuously variable within each 10 dB.
The output frequency is that of the tuning frequency. The B.F.O. has a
compressor circuit with adjustable compressor speed for automatic regula-
tion of the output voltage.
Internal B & T programmes may be selected which enable the bandwidth
and the effective averaging time of the rectifier circuit to be varied with
frequency at fixed transition points. These programmes may also be remote-
ly controlled.
Additional features include a 6 digit Nixie display for accurate frequency
reading, automatic frequency control (A.F.C.) available with the 4 lower
bandwidths, bandwidth compensation for power spectral density measure-
ments, and tuning signal outputs for use with the B & K Heterodyne Slave
Filter Type 2020.
5
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