Marconi - TF 2337A - Level Meter
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Marconi TF 2337A
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Equipment:
TF 2337A
Date:
1976
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Information
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 Amplifier 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%.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
40
Size:
1.8 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
May 28, 2016
MD5:
5ea122a1-d1a7-3f51-2b53-b40824fa8787
Downloads:
921
Information
Chapter I
1
1
Chapter 2
2
2
2
2
2
Chapter 3
ΓΪ
Chapter 4
4
4
4
General information
1 Introduction
2 Data Summary ...
Operation
. 1 Installation ... ... ... * ... ... 8
. 2 P ower Supply ... ... ... ... ... ... ... ... 8
2.2.1 Mains Trans Cornier Tapping ... ... ... ... ... ... 8
»3 Controls aw! Conned inns . ... ... ... , „ ... ... 9 »4
Operation ... ... ... .,, ... ... ... ... ... 9
2.4.1 Preparation for Use ... ... ... ... ... ... 9
2.4.2 Level Measurement ... ... „ ... ... 10
2.4.3 Distortion Measurement .. ... ... ... ... ... ... 10 ,
5 Calibration ... ... ... ... ... ... ... ... 10
Technical Description
, 1 Principles of Opern ti on .. ... ... ... ... ... ... ... 12
, cit i I I iiuiuu'Y . ... ... ... ... ... ... - ... ... Cl
, 3 Circuit Description ... ... ... ... ... , ... ... Li
3.3.1 Detailed Description of Ratio Circuit ... ... . . .
... ... 14
Maintenance
1 Introduction
2 Access
3 Performance Checks
4.3.1 Level Meter Accuracy ...
4.3.2 Level Meter Frequency Response
4.3.3
Band Rejection Filter 4.3.4
Harmonic Characteristic .
4.3.5
Distortion Meter Accuracy
4.3.6
Ratio Circuit ... ...
4.3. 7
Input Resistance . . ...
4.3.8
Input Shunt Capacitance ...
Chapter 5 Repair
5.1 Introduction ... ... ... ... ... ... ...
...23
5.2 Fault Location .. ... ... ... ... ... ... ... ... 23
5.3 Waveforms ... ... ... ... ... ... ... ... ... 23
Table 5.1 Fault Location. ... ... ... ...
...24
Table 5.2 (a) Transistor DC Voltages . „ ... ... ...
...25
Table 5.2 (b) Integrated Circuits DC Voltages .. ... ...
... 26
5.4 Alignment Procedure ... ... ... _________ ...
...26
5.4.1 Power Supply 26
5.4.2 Level Zero Adjustment .. ... ... ... ...
...27
5.4.3 Level Gain ... ... ... ... ... ...
...27
5.4.4 Distortion Zero .. ... ... ... ... ... ... ... 27
5.4.5 Distortion Gain and Ratio Adjustment ., ... ...
...27
5.4.6 400 Hz Band Rejection Filter 27
5.4.7 1000 Hz Band Rejection Filter 28
5.4.8 Bias Adjustment . ... ... ... ... ...
...28
5.5 Chassis Wiring .. ... ... ... ... ... ,-*·*
...28
Table 5.3 Connector Resistance Checks ... ... ...
...29
5.6 Packaging for Reshipment ... ... ... ... ...
...30
Chapter 6 Replaceable Parts
6.1 Introduction ... ... ... ... ... ... ... ... ... 31
6.2 Ordering ... ... ... ... ... ... **♦ ««· ·■· ’ 31
6.3 Parts List ... ... ...
...32