Operation; Measurement Arrangement - BRUEL & KJAER 4292 Instructions And Applications

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3. OPERATION
3.1. MEASUREMENT ARRANGEMENT
For vibration measurements the 4292 should be used with one of the
following instruments:
a) Microphone Amplifier Type 2603, or the Measuring Amplifiers
Type 2606, 2607, or 2608.
b) Octave and Third Octave Spectrometers Type 2113 or 2114, or the
Real Time Analyzer Type 3347.
c) Frequency Analyzer Type 2107 or the Heterodyne Analyzer
Type 2010.
d) Microphone Power Supply Type 2801 plus an Electronic Voltmeter
Type 2409 or similar.
These instruments not only provide the supply voltages necessary to
operate the calibrator and preamplifier sections of the 4292, but they also
serve to provide an indication of the acceleration, velocity or displacement
level of the vibration to be measured. If a recording of the measurements is
required they may be connected to the 2305 Level Recorder, which in the
case of the Spectrometers or Analyzers mentioned will be found especially
useful in that an analysis of the vibration investigated can be carried out
automatically on preprinted frequency calibrated paper. In the case of the
Real Time Analyzer Type 3347 a third octave analysis is carried out and
instantaneously displayed on a cathode ray tube. Therefore a graphic re-
cording will not always be found strictly necessary.
For measurements the instruments should be connected to the 4292 as
shown in Fig.3.1. Two possible methods of connecting the instruments are:
1. The measuring arrangement is placed in the immediate vicinity of the
measuring point.
The PREAMP. PLUG of the 4292 should' be connected to the seven
pin input socket on the indicating instrument (PREAMP. INPUT on
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