Marconi - TF 1370A - Oscillator
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Marconi TF 1370A
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Equipment:
TF 1370A
Date:
1970
Category:
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Information
FEATURES
The TF 1 370A is a general-purpose sine wave generator covering the
frequency range 10 c/s to 10 Me/s. It also delivers a high-quality square wave
output at frequencies between 10 c/s and 100 kc/s.
The instrument is primarily a signal source for measurements and tests on
audio and video amplifiers and networks. With its four output impedances -
600, 130, 100, and 75 n - it is suitable for use with transmission linesj filtersj
attenuators, etc.
Among other applications as a sine wave generator is that of providing the
excitation voltage for a.f. and r.f. bridges. And
the quality of the square wave output also renders the instrument particularly
effective for such purposes as rapid testing of audio amplifier bandwidth.
The signal originates in a Wien bridge oscillator covering 10 c/ s to 10 Me/ s in
six decade bands, the top band extending from 1 to 10 Me/s. A single scale is
used for the four lower bands and separate scales for the two upper bands;
this gives a total scale length of 105 inches and makes a 1% change in
frequency easily discernible.
TF 1370AR is a rack-mounting version of the TF 1370A and is supplied,
complete with dust cover, for mounting in a standard 1 9 inch rack.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
45
Size:
10.0 MB
Language:
english
Revision:
Manual-ID:
OM 1370A
Date:
July 1970
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
Jan. 6, 2019
MD5:
971afbda-80da-68a6-1105-8dff24f9b3ab
Downloads:
433
Information
Section 1 GENERAL INFORMATION
1.1 Features ... ... ... ... 3
1. 2 Data summary ... ... ... 4
1.3 Accessories ... ... ... ... 5
Section 2 OPERATION
2.1 Installation ... ... ... ... 8
2.2 Switching on ... ... ... ... 8
2. 3 Sine and square wave outputs ... ... 8
2.4 Controls and connectors ... ... 8 2. 5 Adjusting frequency ... ... ...
10 2. 6 Setting output voltage ... ... ... 10
2. 7 dB readings ... ... ... ... 13
2.8 Setting up audio standard output ... ... 14
2.9 Adjusting square wave sag and mark/space ratio 15
2.10 Use of accessories ... ... ... 15
Section 3 TECHNICAL DESCRIPTION
3. 1 Circuit arrangement ... ... ... 18 3. 2 Oscillator ... ... ... ... 18
I 3. £ 20 dB amplifier • ... ... .... 19
3.4 Schmitt trigger ... ... ... 19 3. 5 Output cathode follower ... ...
20
3.6 Output monitor ... ... ... 20
3. 7 Output connections ... ... ... 20
3.8 Regulated h. t. supply ... ... ... 22
3.9 Regulated 1.1. supply ... ... ... 22
Section 4 MAINTENANCE
4. 1 General ... ... ... ... 25
4.2 Fuses ... ... ... ... 25 4. 3 Input supply voltage ... ... ... 25
4.4 Removing case or dust cover ... ... 26 4. 5 Replacement of panel
lamps ... ... 26 4. 6 Replacement of valves and transistors ... 26
4.7 Preset adjustments ... ... ... 27
4.8 Functional checks ... ... ,,, 30
COMPONENT LAYOUT ILLUSTRATIONS ... ... 31 LIST OF REPLACEABLE
PARTS ... ... ... ... 35 DECIBEL CONVERSION TABLE ... ... ... ... 41
Section 5 CIRCUIT DIAGRAMS
Circuit notes ... ... ... 44
Fig. 5. 1 Power supply ... ... 45
Fig. 5.2 Oscillator and squaring stages ... 47
Fig. 5.3 Monitor and output stages ... 49