Re: Will this laser idea work? On topic
- From: Eric R Snow <etpm@xxxxxxxxxxx>
- Date: Tue, 04 Oct 2005 07:09:31 -0700
On 4 Oct 2005 02:26:39 GMT, dnichols@xxxxxxxxxxx (DoN. Nichols) wrote:
Thanks DoN.
Eric
>According to Eric R Snow <etpm@xxxxxxxxxxx>:
>> On 4 Oct 2005 00:11:27 GMT, dnichols@xxxxxxxxxxx (DoN. Nichols) wrote:
>
> [ ... ]
>
>> > The main question is whether he can identify the ground clip on
>> >the probe as described. Most Tektronix scope probes of relatively
>> >recent vintage have a groove about half-way back from the tip to the
>> >entrance point of the cable. A clip, sort of like a small version of a
>> >hairpin clips into this to connect the ground clip to the scope probe's
>> >ground.
>> >
>
> [ ... ]
>
>> DoN,
>> Maybe probe is the wrong word. What I have is a coaxial cable with a
>> twist on connector that fits the input on the 'scope. The cable is
>> about 18 inches long. At the other end two wires with clips on the
>> ends are coming out. The red wire is connected to the center wire of
>> the coax. The black to the outside conductor of the coax. It has
>> molded into the strain relief: POMONA ELECTRONICS and the numbers
>> 5155. I don't know if probe is really the correct word. But using it,
>> along with Ned's great instructions, I was able to see all four of the
>> transitions for each line of the encoder.
>> Eric
>
> O.K. I know those, and I would never call them a probe. At
>least, you don't have to worry about adjusting the vertical V/Div for
>that, it is a 1:1 connection. And until you get to high frequencies,
>you probably don't need to tune it for the scope's input
>characteristics, either.
>
> I probably would just call it a BNC to clip lead cable, FWIW.
>The twist-on connector is a BNC (Sometimes attributed to "Berkeley
>Nucleonics Corporation", but I think that the "B" is for "Bayonet" and
>that it predates the company. The "N" would seem to be for the Type-N
>connector, except that is a larger connector for a larger cable. But
>the other features (aside from the Bayonet locking ring) are quite
>similar to the Type-N scaled down.
>
> There is also a "TNC" connector (Threaded instead of Bayonet),
>but that is less common, and less convenient for most uses.
>
>
> You really should get the proper 10X probes for your 'scope, as
>they have the advantage of not loading down the circuit under test the
>way the capacitance of the coax cable does. Here is an auction about to
>close for a nice set:
>
> 7549779574
>
>It has gotten fairly steep already, so you might want to wait for
>another set at a better price. This set started at $9.99, which would
>be a nice price, but it is now up to $56.00 with about an hour and a
>quarter to go.
>
> This auction:
>
> 7551038306
>
>has a buy-it-now, and a more affordable price, but I'm not sure who
>actually made these probes. I'm pretty sure that they are not by
>Tektronix.
>
>
> This one:
>
> 7551281799
>
>is still pretty affordable, and the probes are about the right vintage
>for your scope, I think. (Quite similar to the ones for my Tektronix
>454 scope, but a bit faster.)
>
> There are several in close sequence starting with:
>
> 7551229886
>
>which are starting at an attractive $1.00 each, but those are 1X
>probes, not 10X.
>
> My ebay search was a simple:
>
> Tektronix scope probes
>
>and it turned up a lot of scopes as well.
>
> Enjoy,
> DoN.
.
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