BRUEL & KJAER 2010 Instructions And Applications page 71

Heterodyne analyzer

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Transducer

Output

Heterodyne Analyzer

2010

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Tape Recorder

7001

Fig.6.5. Recording with 7001 Tape Recorder

recorders provided that their input impedance is greater than 5 k.Q. For

recorders with a recording level considerably less than 10 V RMS, the circuit

in Fig.6.6 should be used to attenuate the recorder's input signal, as this

gives a better signal-to-noise ratio than using the output attenuator of the

2010.

Heterodyne Analyzer

2010

10kn

Tape Recorder

171397

Fig.6.6. Attenuation of 2010 output for tape recording

For an analysis of a tape recording, the information to be processed is

made into a tape loop and fitted to the loop adapter of the 7001 in the

instrument set-up shown in Fig.6. 7. Synchronization between the tuning

frequency of the 2010 and the paper movement of the Level Recorder is

obtained using the Flexible Drive Shaft UB 0041 connected between the

two instruments.

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