Re: Just call me Mr. Sampler (and button question)


Stan or Patricia Griffiths <w7ni@...>
 

Hi Michael,

I have made a few comments below:

Michael Dunn wrote:

Geez, somehow I've ended up with three 1GHz sampling plug-ins.

The 1S1 is semi-working after my restoration attempt. I don't
think it's fully happy with my Schottky GaAs subs...
I haven't ever tried this so you could be right . . .

Newly acquired is a 3S76 (2-chan!). Does anyone have a manual to
sell or partly copy?
Check out the list on my web site at <www.reprise.com>

Unfortunately, I think it needs a companion
3T77 to operate.
The 3T77 is one timebase that will work with the 3S76. You are right that
there MUST be a sampling timebase to operate with it. Others that will work
with the 3S76 are 3T77A, 3T4, 3T2, and maybe 3T5 or 3T6 (I have never tired
these with a 3S76 but I know of no incompatibility).

Otherwise it's in good shape. Maybe I'll harvest
some GaAs diodes from it!
I think the GaAs sampling diodes used in the 3S76 are the same as those used
in a 4S1 but I can't remember for sure. I would have to check manuals to be
sure. I know the ones in the 1S1 have different part numbers but maybe you
could make the 3S76 diodes work in a 1S1. That is another good idea worth
exploring.

Remember, don't handle the sampling diodes with your fingers. Grease from
you fingers will contaminate them and attempts to clean them with alchohol
have been only marginally successful. Also, don't chip the black paint they
are painted with since this will allow light to reach the junction and that
ruins them also. I don't know the exact nature of the failure of sampling
diodes due to exposure to light but I understand it is permanent. Many
sampling diode problems are related to improper diode handling techniques.
When a technician first hears he can't handle them with his fingers, he uses
his needle nosed pliers and chips the paint . . . then he realizes what those
special plastic tweezers that Tek used to ship with new diode sets are for .
. .

It has TWO connectors on the rear-panel in
a "T" layout, whereas the scope bay just has one. Does this require
a special mainframe, or is the second connector for testing or
something?
The second (vertically oriented) connector is for feeding digital information
to the 6R1 or 6R1A Digital Readout unit when the 3S76 is used in a 567
mainframe. It may also work to feed readout information to a 230 when used
in a 568 mainframe, but I have never tried that combination before. It
connects to nothing when used in a non-readout scope like a 561A or 564.

Or, is there a special cable or board that connects it to
the 3t77?
No. It doesn't connect to the 3T77. It connects to a 6R1, 6R1A, or maybe a
230 or nothing at all.

Also new -- a 7S14! A real beauty. Two channel, with timebase.
And..... It works :-) Mostly anyway. There's a bit of lumpy noise
in one trace, and the buttons are all pretty sticky. So, any
recommendations for cleaning and lubricating those 7000-series
buttons? Oh, I wouldn't mind a manual for this one either. Guess
it's time to build me some crude 50:1 or 100:1 passive probes! Oh,
the delayed timebase ring is also missing. I've seen a picture of
this - a rare example of really bad design from Tek as far as I can
see. The pointer for the delayed setting is on a ring just like the
main pointer, but smaller diameter. The 2 sweep knobs are normal
concentric ones, and said ring is attached to the "upper" knob by a
couple of fragile looking plastic ribs that travel down to it down
the sides of the main knob. Seems to me that the first time you
turned the MAIN knob a bit too violently, your fingers would tear off
those ribs!
I just haven't ever had a chance to spend any time with a 5S14 so I don't
know didley about it.

Michael Dunn
(the original ;-)

p.s., TekScopes continues to grow well. We have over 60 members now.
Soon it will be my most populous group. We should throw a party or
something.
I hope this helps some, Mike.

Stan
w7ni@...

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