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Advance Instruments OS250 Oscilloscope
Manufacturer:
Model:
OS250
Date:
1974
Class:
Type:
SubType:
10MHz dual trace oscilloscope

Information

The Advance OS250 Oscilloscope is a 10 MHz dual trace instrument with a 10cm x 8cm display. It is designed for use in general purpose laboratory work, educational uses, TV and servicing applications. It features two identical input channels with a maximum sensitivity of 5mV/cm and a bandwidth of DC to 10MHz. The two channels may be viewed separately, alternately at fast timebase speeds, or chopped at a 250kHz rate at low timebase speeds. Particular attention has been paid to trigger performance, and the system used includes a variable control with bright line operation in the absence of a signal, or when the trigger level is outside the range of the input signal.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
37
Size:
5.43 Mbytes (5693414 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
unknown
Quality:
Scanned document, all readable.
Upload date:
2012 12 31
MD5:
25a1a4bca32d7b2877973999d853fcaa
Downloads:
1598
Cirquit Diagram
Manual type:
Cirquit Diagram
Pages:
5
Size:
1.28 Mbytes (1341433 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
1974 01 01
Quality:
Scanned document, very well readable.
Upload date:
2017 08 26
MD5:
c04a522e9a75c6fb6e9fd0710eb4ce0d
Uploader:
Alex
Downloads:
612

Information

Info Note: All the schematics with good quality.

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New
says...
Many thanks for the uploader, site creator and maintenance team! :)

My oscilloscope

This is my only oscilloscope, and im depending on him to do my school project. He always have been a got buddy, but now need some service.. and this manual are a great help!
So far im i see that the Diode bridge (MR301) are not rectifying well.. he are producing a AC current on output, and the DC tension is about 30V (instead 155V, even if i adjust R320). But after i replace a Diode Bridge by a new "2W08", after a couples os seconds i have a drop of tension across C315 (155V to 60V).. i need to troubleshoot a little more, but maybe is the C315, TR301 or TR302 that are not healthy.. we will see :)

have a good day everyone! and thanks again!