Equipment information

Advance Instruments OS250 Oscilloscope
Advance Instruments
Model OS250
Date 1974
Category: Measurement instruments
Group Oscilloscope
Description 10MHz dual trace oscilloscope
                                    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.

These manuals are available for the above equipment:

Advance Instruments -- OS250 -- Service and User Manual
File name Advance-3823-Manual-Page-1-Picture
Manual Type Service and User Manual
Pages 37
Size 5.43 Mbytes (5693414 Bytes)
Language english
Quality Scanned document, all readable.
Upload date
MD5 25a1a4bca32d7b2877973999d853fcaa
Downloads 571 since 31 December 2012
Start Free Download

Advance Instruments -- OS250 -- Cirquit Diagram
File name Advance-9410-Manual-Page-1-Picture
Manual Type Cirquit Diagram
Pages 5
Size 1.28 Mbytes (1341433 Bytes)
Language english
Date 01 January 1974
Quality Scanned document, very well readable.
Upload date
MD5 c04a522e9a75c6fb6e9fd0710eb4ce0d
Downloads 17 since 26 August 2017
Uploaded by: Alex
Info Note: All the schematics with good quality.
Start Free Download

Comments (1)

Topic: Advance Instruments OS250
0/5 (0)
OS250 user
Apr 2016
First Poster
OS250 user 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!

Add Comment

* Required information
Enter the third word of this sentence.
Powered by Commentics