Equipment information

Marconi TF 2337A Level Meter
Model TF 2337A
Date 1976
Category Measurement instruments
Group Level Meter
Description Automatic Distortion Meter
                                    The TF 2337A Automatic Distortion Meter enables rapid and
accurate measurement of both level and distortion,factors of
audio frequency signals. The need to tune tor fundamental
frequency rejection is avoided, thus operation simply
consists of the selection by push button switches of the
input voltage range, distortion range and fundamental frequency.
The instrument measures distortion in the conventional way,
that is, by filtering out the fundamental component and
comparing the residual with that of the total signal.
However, because of the novel design of the ratio circuit
the need for reference level adjustment prior to distortion
measurement is obviated. Thus fluctuations of the input
level (up to -10 dB) will not affect the accuracy of the
distortion measurement.
The TF 2337A is therefore suitable for repetitive distortion
measurements and because of its simplicity of operation is
ideal for factory testing of mass production units such as
a. f. amplifiers etc. Furthermore as the instrument employs
a multi-stage Twin-'Γ active filter having a fairly wide
rejection band (66 dB at-+5% of fo), the affect of wow and
flutter on the distortion measurement is negligible.
This attribute is particularly useful for t. h. d.
measurements of output signals on equipment such as tape
recorders and record players.
Owing to the use of field effect transistors in the input
stage, internal noise is low and therefore with input
signals as low. as 10 mV, distortion can be measured down to
0. 01%.

These manuals are available for the above equipment:

Manual Type Service and User Manual Marconi-7807-Manual-Page-1-Picture
Pages 40
Size 1.80 Mbytes (1887195 Bytes)
Language english
Date June 1976
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 5ea122a1d1a73f512b53b40824fa8787
Downloads 200 since 28 May 2016
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