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It's actually less work than you might think. Creating the connector
finger is easy enough. I don't remember that I had to do too much other
than create a single rectangle. However, aligning each to the gridwork
that is the pin spacing, that eliminates errors there. That's
essentially the trick here.

Then you make one, then copy that and make 2, then 4, then 8, and so on

Delete the ones you don't need. It turns out to be less effort than you
might think.

All of which is true if you don't want to use a script (I think that
Eagle doesn't have python scrips). Many can't program, or don't want
to, so the alternate does work.

Ultimately, you do what makes sense to you. Either method works....

Harvey

On 7/28/2021 8:07 PM, Ke-Fong Lin wrote:

What the python script does is to do a step and repeat that you're doing
manually.

Hi Harvey,

I agree that you can do it manually.
However, it's very tedious and error prone, whereas a computer would

basically shine at that kind of repetitive task.

Plus a script can be retargeted, just plug-in the new pitch value and

voila.

Best regards,

What the python script does is to do a step and repeat that you're doing
manually.

Hi Harvey,

I agree that you can do it manually.
However, it's very tedious and error prone, whereas a computer would basically shine at that kind of repetitive task.
Plus a script can be retargeted, just plug-in the new pitch value and voila.

Best regards,

On Jul 28, 2021, at 10:00, Michael A. Terrell <terrell.michael.a@...> wrote:

I bought a reel of 5000 - Vishay HER105-T High Efficiency 400V 1A DO41
Diodes, a couple years ago for under $23.

On Wed, Jul 28, 2021 at 12:34 PM Tom Lee <tomlee@...> wrote:

A series string of UF4007s with a 10kV breakdown voltage would have of
the order of 1pF capacitance. The problem with 1N4007s is with their
slow reverse recovery (hence the UF4007 recommendation). But reverse
recovery is distinct from junction capacitance.

I see that, thanks - I'm going to take a look at the schmitt trigger input
circuitry with diode clamps you use and experiment some. Need to look at
the trade-offs between the two approaches, I always relish having options
to consider. In my experience any adequately interesting engineering
problem contains trade-offs that take time to consider, the no-brainer
decisions are not really the interesting problems.

Appreciate the discussion, I do think that creating a modern toolkit to
keep 7000 (and possibly 5000) mainframes in top working order without
relying on a diminishing pool of original cal fixtures will pay off. I do
not feel any responsibility to create the one-and-only-perfect-fixture, but
am excited that as a community we can have a set of proven circuits that
can be mixed-and-matched, improved, tweaked, etc.

On Wed, Jul 28, 2021 at 11:31 AM Ed Breya via groups.io <edbreya=
[email protected]> wrote:

OK, I managed to scan my old readout exerciser schematic, posted here:

/g/TekScopes/album?id=266548

Now I'm remembering some details. I had to do some tricks to skip certain
parts of the code table and functions, so only the character set would
show. It does not test any of the other RO functions. For a universal

type

interface/test setup, you'd want to have all of the code table available,
using the full current ranges. Another reason to use IC DACs, is that you
can include the provision for limit testing. Rather than just the nominal
current steps from a 4-bit DAC, with say 8 bits, you could tweak the

values

around to check where the readout decides the values.

Ed

--
Andy

Hmmm, I'm not seeing anything that looks like any of the Iwatsu scopes I'm familiar with.? I used to have 3 of them; can't remember model numbers, but they did have 60, 100, and 250 MHz bandwidths.? ?The 60 MHz one had a DMM and frequency counter on top.? Obviously copied from Tek 400 series scopes, but why own Iwatsu when you could own Tek?? So I sold them all and bought several Tek 7000 and 5000 series scopes. :)? ? ? ? ? ?Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Tom Lee <tomlee@...> Date: 7/28/21 9:30 AM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Tek Scopes found in old picture book Offhand, I'd say that it is an Iwatsu, maybe an SS-5706.Tom-- Prof. Thomas H. LeeAllen Ctr., Rm. 205350 Jane Stanford WayStanford UniversityStanford, CA 94305-4070 7/28/2021 09:11, Carsten Bormann wrote:> On 2021-07-28, at 17:02, Dave Peterson via groups.io <davidpinsf@...> wrote:>> And are those 400 series scopes I see hints of (blue screens) on the far right of the racks?> My brain tells me that I saw Hamegs in the rack when I visited seven years ago.>> My picture at is not clear enough to read what’s on the scope in the rack; it doesn’t shout “Hameg” at me either.> It doesn’t look to me like a 475 or some such.>> Grü?e, Carsten>>>> >>

A series string of UF4007s with a 10kV breakdown voltage would have of
the order of 1pF capacitance. The problem with 1N4007s is with their
slow reverse recovery (hence the UF4007 recommendation). But reverse
recovery is distinct from junction capacitance.