Upon the date 03:24 PM 6/17/99 -0500, Greg Linder said something like:
> The Tek scope is a model 451. It's a single trace scope. I also
>need to figure out how to make a properly configured test probe for this
>thing. It's got big RG-58/u type connectors on it.
Hmmm, I've got no manual for this exact model but I could give you some
rough guesses as to possible causes. I recommend that you search out a
manual for this machine as it will give you the "road map" you will need to
travel to the solution. Sorta sounds like a simple problem. Maybe one of
the leads to a horizontal deflection plate is broken or that part of the
horiz. driver has failed.
I can help you with suggestions where to hunt for a manual if you like.
Test probes could be a simple hunk of stiff wire if you're not at all
concerned with looking at short pulses or high frequencies (above, say, 200
kHz or so) or low level circuits which could be overloaded by the typical 1
megohm input impedance of the 'scope or by high voltages. But I recommend
you invest in a reasonable probe for your scope. You'll be happy with the
results. $40-$50 for some lo-cost units I've seen advertised plus several $
for a BNC-to-PL259 adaptor. Virtually all probes sold today have BNC
connectors. Contact me off-list about these issues if you like.
The connector type on those earlier Tek scopes like yours is called SO-239.
A PL-259 connector mounted on a coaxial cable plugs into it. Later on, I
can't recall exactly when (mid-60's?), BNC type connectors came into use on
most 'scopes. Lower losses at high frequencies, lower impedance and,
therefore, less rounding of leading/trailing edges of waveforms with BNC conns.
RG-58 and other RG-numbers are coaxial cable type designators. The
RG-numbering system was created by the military over 50 years ago to
standardize coax cable specs for consistent manufacture.
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt_at_netsync.net
Member of Antique Wireless Association
Check our redesigned website!
URL:
http://www.antiquewireless.org/
Received on Thu Jun 17 1999 - 19:42:59 BST