Chuck: Miscommunication:

CAL 01 use TG501
CAL 02 Use PG506,

ONLY for transient CAL was I reffering to the old 2901! It is used to just drive the TD pulser.

Yes I did finally finish CAL 01 and it is properl;y calibrated, my question was the internal flow of the CAL 01 when a limit is reached in a particular step.

Jon

Dear Chuck, many thanks for these precice diagrams. I found it easier to count the number of pulses per division, as you have mentioned in an earlier post.

I did the entire CAL in sequence, PSU, DAC REF and CRT CAL as you reccomend

Confusion/iteration:

Step 19 >>hits limit
Step 20>> may hit limit or be OK
next step returns to 19 same problem

When I said Iteration I mean the procedure should iterate between limit steps and converge but it does not)

_________________________________________

NOTES:

a. Checked A1 IC temps after hours on:

U800, one hybrid 38-42 deg C
all other hybrids 28-32 deg C

Applied small fan. All IC temps on A1 now 25-28 deg C (used IR probe)

b. Discovered that the TU-5 pulser (and probably other TEK TD pulsers) can operate from the ancient TEK 2901 time mark generator.

You take the 25V 1 K ohm marker amplifier output! I set the gen for 10 or 100 usec markers.

This is very convenient as the 2901 is a small self contained generator.

Enjoy!

Jon

I was only referring to the linemans glove for the high voltage on the 2nd anode when it was removed from the tube. Not to wear. I used to repair TV sets for Heathkit years ago when I was recently out of high school. I have been bit by 40kv before. Luckily most of my electronics repair career was in 2 way communications and later medical electronics in a hospital.

73 Richard W4MCD

Dear Chuck
Mille mercis encore for all your sage advise and experience!

I finished the cal of #1, 2467 OPT 06/09 ser B0104xx. I had every cal cable, test fixture and generator. All went fine but a few questions please.

1/ CAL 01 HOR was very long, at 3 steps for B sweep, I could not align traces and hit limits, so the procedure would step back and reiterate many times. The result did not converge to a solution, the bench scope trace separation got worse or better each time, but did not close for about 20 iterations each of the 3 steps.

Perhaps my initial pulse count was off?
Is it better to approach a limit and then end step or to hit the limit and end step?
How does the test program converge if you hit limits? After hours I finally finished and it IS calibrated!

2. This is an early unit, thru hole A5 with separate RAM and battery. I used the closest manual, for 2467: SN B011246 and above, the UIT is SN B0104xx

For CAL 06, transient response near the end, the scope steps deviated, with many additional steps not in the manual.
I just passed thru all of those and the result seems OK. Do you have any manual for this low SN 2467? (at least for CAL 06)?

Now just Three more to go, 2465B/2467B with better manuals, this old brain may still have a few neurons to spare..
As I follow the CAL procedures and finish, I can only marvel at the engineering and performance of these 30 years old machines!

Happy to have your comments and guidance!

Bon journée,

Jon

On Jul 22, 2019, at 10:39 AM, Mike Dinolfo <mdinolfo@erols.com> wrote:

Walter:
Could you provide a url to the on-line photo(s)? I looked at w140.com, and on the Tekscopes groups.io site, but I couldn't locate it/them. Although it's probably staring me in the face as I type.

Thanks!
Mike Dinolfo N4MWP

If you are not able, unwilling or scared to get an occasional nip while
working on scopes or any other electronic equipment with voltages higher
than 40-50v probably best to stay away from them in the first place. Trying
to work on any electronic circuit while wearing linesman gloves is a silly
overoptimistic thought. Just implement safe practices that make sense for
the equipment that you plan on working on and that's it. If you ever get
some sort of Jacobs Ladder electric arc project going, then buy those
linesman gloves, and get a pair of round welders glasses as well to go with
the mad scientist outfit ;-)

I would be truly frightened, for your equipment's sake, if
you were to start poking around in it, wearing such a clumsy
linesman's glove.

Working in linesman's gloves will be quite similar to working
in a pair of boxing gloves.

PPE like a linesman's gloves will be unuseable for any real
testing and repair of test instruments, and will require you
to keep taking them off to probe this, or adjust that, or
adjust your glasses, or scratch yourself, and you will soon
find yourself caught doing unsafe things without your PPE.

Linesman's gloves are meant for people who work with large
wrenches, and hammers, and test equipment that comes attached
to 10 foot fiberglass poles. They are as much to keep splinters
out of your fingers, as they are to keep you from being distracted
by a little otherwise harmless tingle from a capacitively coupled
floating power line.

It is far better for you to learn to work safely, then it
is for you to delude yourself into thinking that any gimmick can
protect you from your unsafe practices.

-Chuck Harris

Richard in NC via Groups.Io wrote:

Nielson I like the idea of using a linemans glove. Where would I go about finding one for sale?

73 Richard W4MCD