Date   

Re: Looking for a better in circuit ESR meter

Chuck Harris
 

You can always take the engineer's way out, and use your scope (OS)
and a function generator (FUNC).

......................................
FUNC o)=======@.......................
......|.......|.......................
......|......10K......................
......|.......|.......................
OS...o)=======@============@===========> To cap
......|....................|..........
......|................. DIODE........
......|..................CLAMP.......@=>
......|....................|.........|
.....///..................///.......///

Set the function generator to 100KHz, and 10Vpp, and set your scope
to external trigger on the function generator's trigger output.

The head to tail diode clamp will protect your circuitry from over
voltage by the function generator, and the scope will show a P-P
signal that represents the ESR. Since the current into the cap is
1ma, ESR is easily calculated from the P-P voltage measured.

Slow the function generator down to a point where Xc dominated the
impedance, and you can calculate the capacitance from the voltage.

It is ground referenced, so make sure the DUT isn't plugged into
anything that is grounded.

The idea is, of course, gratuitously stolen from others...

-Chuck Harris

Reginald Beardsley via groups.io wrote:

Does anyone have any experience with the B&K 881? It appears to provide the same testing as the EDS-88A for about $75 less. In fact looks like an outright copy with minor changes. Of course, that does not mean it is any good.

I'm dealing with a SMPS which has caps in parallel with a resistor and a diode. All crammed into a very small space. Both the Arduino based BSIDE ESR02 Pro and the Peak atlas ESR70 can't deal with the diode and resistor and produce similar <100 pF answers. From looking at the output on a scope I think both are turning the diode on.

Reg




Re: 7633 Does not Display One plug in in "ALT" Vert mode.

Albert Otten
 

Hi Michael,

I would indeed start with checks on the logic board <2>. The Theory is quite clear about signal levels and paths. In both mainframe ALT and plugin ALT the flip-flop U156A is involved and probably refuses to switch between states. If not defective itself the toggle pulses from the time base unit (via connector pins B4) could be missing. (Just guessing).

Albert

On Thu, May 14, 2020 at 08:11 PM, Michael W. Lynch wrote:


Good Day to all:

I have a 7633 that works well for the most part, however, it has one nagging
issue. The "ALT" button does not display a trace from one of the two plug
ins. This is regardless of what type of plug in is inserted. I do not
believe that it is the plug ins, since they can be inserted into a fully
working 7623A and function normally. On the 7633, the other Vertical
Functions seem to work correctly. CHOP displays both sets of traces for both
plug ins when 2 - 7A26 plugins are used (so four traces appear). Push the ALT
button and the top set of traces disappears. When the ALT button is pushed,
there are readouts for both plugins and they are "IDENTIFIED" when that button
is pushed, just no trace from the left plugin. Left and Right Buttons will
select their respective plugins, however, when using either one alone, the ALT
switch position on either plugin does not work. Select LEFT button and set
the Left Vertical to ALT and you only get one trace with a dual trace plugin,
however, you get two traces with the plugin switch set to CHOP. So I am
thinking that there is an issue with some part of the logic in the Mainframe?
The plugins seem to work normally when they are inserted into a different
working Mainframe. I hope that I have not mixed up the various conditions
that I have observed.

Any ideas?

Thanks to all!
--
Michael Lynch
Dardanelle, Arkansas


Re: 7A13 Vs W Plugin

Eric
 

Michael,

    I would imagine that with modern manufacturing you could source higher precision resisters then what was available at the time anywhere. I know precision resister can run around $20.00 each but those were for voltage reference units for 6.5 and 7.5 digit meters. So some extreme precision

Eric

On 5/15/2020 3:26 PM, Michael W. Lynch via groups.io wrote:
Eric,

Since I do not own the Calibration fixture, I rely on the -01 manual Cal Procedure, which does not require that fixture. The Fixture is great when you are doing 576 calibrations regularly or several at a time. It is faster than the -01 procedure as far as I have been told. The -01 Cal procedure requires some special resistors, which TEK offered as a kit. I would like to find that original TEK resistor kit.

Hope you get it all sorted out.


Re: 311-1404-00 concentric potentiometer for (R)7603: Intensity and Readout control

John Brown
 

Bad news come in pairs, threes, something.

Just did my search on the 311-1404-00 and this thread was second hit!! I'm in need of the same item for a 7613.

Anybody find one laying around looking lonely?

John


Re: 2465b possibly really stupid question (noob)

Roy Thistle
 

On Wed, May 13, 2020 at 09:21 AM, Chuck Harris wrote:


The only way to get methanol out of the distillation of
yeast digested sugars is by burning your mash during the
distillation process.
Hi all:
Well, probably...yes and probably no.
Probably, yes... if, it is all and only "... yeast digested sugars..."
However, if you are not in the lab, doing fractional distillation, using a reflux column, and carefully monitoring the temperature... then, perhaps see:
Ohimain (2016, Sept. 20) Methanol contamination in traditionally fermented alcoholic beverages: the microbial dimension (springeropen.com)
Best wishes all.
Roy


Re: Looking for a better in circuit ESR meter

Reginald Beardsley
 

Does anyone have any experience with the B&K 881? It appears to provide the same testing as the EDS-88A for about $75 less. In fact looks like an outright copy with minor changes. Of course, that does not mean it is any good.

I'm dealing with a SMPS which has caps in parallel with a resistor and a diode. All crammed into a very small space. Both the Arduino based BSIDE ESR02 Pro and the Peak atlas ESR70 can't deal with the diode and resistor and produce similar <100 pF answers. From looking at the output on a scope I think both are turning the diode on.

Reg


Re: 7A13 Vs W Plugin

Michael W. Lynch
 

Eric,

Since I do not own the Calibration fixture, I rely on the -01 manual Cal Procedure, which does not require that fixture. The Fixture is great when you are doing 576 calibrations regularly or several at a time. It is faster than the -01 procedure as far as I have been told. The -01 Cal procedure requires some special resistors, which TEK offered as a kit. I would like to find that original TEK resistor kit.

Hope you get it all sorted out.

--
Michael Lynch
Dardanelle, Arkansas


Re: V. posn defocusses CRT trace - why?

 

Hi Tim,

I recently experienced on an old oscilloscope weird changes in the trace depending on where it was positioned. Like a normal brightness on the right, with low brightness on the left, and it was NOT a z-axis modulation.
The effect changed when I rotated a rudimentary magnetic shield I had wrapped around the tube, and then I realized that the effect was due to a stray MAGNETIC field on this shield.

Could you have some metal that got magnetized close to the neck of the CRT? This can influence the optics of the electron gun and how the beam behaves being deflected.

Ernesto


Re: 7A13 Vs W Plugin

Eric
 

Bill,

    Yea it seems I tried to do a hard cal on even harder mode. I actually have the cal fixture which has been useful. I should not have to redo the hole calibration as the display amps are done the W is needed in the step gen validation section all checks no adjustments. It is also needed for the collector checks. I was able to do a fair bit with the cal fixture and the 7a13 but the 13 lacks the 0/1/10/1000 attenuation that the W has. I am in the back 1/2 of the calibration procedure all the adjustments have been done so just in confirmation. I have the -01 on order so I'll see what I need to do at this point it might just need a performance check to finish the validation. In terms of difficulty I am not sure which is worse a 576 or a 485 Laughs. But progress is being made.

Eric

On 5/15/2020 12:05 PM, Bill wrote:
Eric

I just went through Calibration of my 576 using the -01 version of the manual about a month ago. I don't remember which scope I used but it was probably my Tek 475 because it was on the bench at the time. That scope and a DVM (3458A in my case, but any 4.5 digit DMM would work just as good if it can measure current) seems to have done the job for the check of the "Multiplier" section which is now #24. I cannot remember exactly but it looks like you use the 576 "Vertical, Horizontal and display offset" knobs of the 576, which have been checked previously in the -01 manual, to do this check. I sure didn't use my 7A13 anywhere in the procedure from the -01 manual. The 070-0905-01 version of the manual has completely been rewritten in the "Performance Checks/Calibration" section. Because the 3458A can measure current I didn't need most of the resistors listed in the "Equipment List" but the DVM is limited to 1 Amp so any checks above 1 A did need the 1 ohm resistor (I think). I also needed a few of the other resistors like the 25 meg, 2.5 meg and so on. So you are correct in getting and reading the -01 manual. The "problem" is that you will have to go through the whole procedure from the beginning. Calibrating the 576 is a very time consuming and lengthy one. It took me days to complete, but I was not working at this 8 hours a day. I was also held up by having to fix several problems during the procedure like dirty switches, pots and power supply filter caps that had become "open".
Bill


Re: TM515 mod UB

Jim Ford
 

Thanks, David.

From the document from Hakan, it's only the center compartment that is wired for GPIB.

Jim

------ Original Message ------
From: "David C. Partridge" <@perdrix>
To: TekScopes@groups.io
Sent: 5/15/2020 4:06:02 AM
Subject: Re: [TekScopes] TM515 mod UB

It is a GPIB connector to connect to the CG551-AP, and that's exactly what Mod UB does.

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jim Ford
Sent: 15 May 2020 06:36
To: TekScopes@groups.io
Subject: [TekScopes] TM515 mod UB

Hi, everybody.

Does anybody know what mod UB is on the TM515? John Gord from this
group gave me a TM515 last year, and I finally got a PS501-1 to go in
it. (Thanks, John!)

It says mod UB on the back, and TekWiki says the CG551AP plug-in
requires a TM515 mod UB or some other mainframes to work properly. But
it doesn't say what mod UB is.

Now, my TM515 has a connector on the back that looks like a GPIB
connector, so I'm hoping mod UB connects the appropriate pins from the
"GPIB" connector to the plug-in slots, so TM5000 plug-ins can be
controlled or read by GPIB.

Another anomaly is that the PS501-1 works OK in the 2 left compartments,
although the 5 V output is kind of unstable, but the 5 V output reads
about 0.7 V in the right 3 slots. Is this normal? Not that I really
need the 5 V fixed output anyway (who uses full-voltage TTL anymore?).

Thanks a bunch.

Jim Ford






Re: TM515 mod UB

Jim Ford
 

Thanks, Hakan.

I will have to take a closer look at the TM515. The pin 13/14 plastic barrier must not be in place because I could insert the PS501-1 into any slot easily.

Jim

------ Original Message ------
From: "zenith5106" <hahi@...>
To: TekScopes@groups.io
Sent: 5/15/2020 2:10:54 AM
Subject: Re: [TekScopes] TM515 mod UB

On Fri, May 15, 2020 at 07:36 AM, Jim Ford wrote:


Does anybody know what mod UB is on the TM515?
http://www.hakanh.com/dl/docs/custommods/TM515modUB.pdf

/Håkan



Re: 7A13 Vs W Plugin

 

Eric

I just went through Calibration of my 576 using the -01 version of the manual about a month ago. I don't remember which scope I used but it was probably my Tek 475 because it was on the bench at the time. That scope and a DVM (3458A in my case, but any 4.5 digit DMM would work just as good if it can measure current) seems to have done the job for the check of the "Multiplier" section which is now #24. I cannot remember exactly but it looks like you use the 576 "Vertical, Horizontal and display offset" knobs of the 576, which have been checked previously in the -01 manual, to do this check. I sure didn't use my 7A13 anywhere in the procedure from the -01 manual. The 070-0905-01 version of the manual has completely been rewritten in the "Performance Checks/Calibration" section. Because the 3458A can measure current I didn't need most of the resistors listed in the "Equipment List" but the DVM is limited to 1 Amp so any checks above 1 A did need the 1 ohm resistor (I think). I also needed a few of the other resistors like the 25 meg, 2.5 meg and so on. So you are correct in getting and reading the -01 manual. The "problem" is that you will have to go through the whole procedure from the beginning. Calibrating the 576 is a very time consuming and lengthy one. It took me days to complete, but I was not working at this 8 hours a day. I was also held up by having to fix several problems during the procedure like dirty switches, pots and power supply filter caps that had become "open".
Bill


Re: Looking for a better in circuit ESR meter

Renée
 

is this in reference to EDS-88A? pulled from Reg's comment?? or something else?
I love zero context
Renée

On 5/15/20 6:09 AM, Randy.AB9GO wrote:
PS. At one time I was doing the eBay try to find a good used one for less
money. Go ahead and buy the new one. There were several circuit updates
implemented later in the products lifetime. upon careful investigation
most of the ones listed on eBay do not have these updates. In addition the
older models are much harder on the battery. The only way to get decent
life is to run Eveready Energizer lithium cells and those do not come
cheap.

@AB9GO


This message sent to you from my mobile device via speech-to-text
technology.

On Fri, May 15, 2020, 9:05 AM Randy AB9GO <@AB9GO> wrote:

I purchased one of those a few months ago and it is an excellent meter
well worth the money.

@AB9GO

This message sent to you from my mobile device via speech-to-text
technology.


Re: 2465 Recap - Trace Returns, But Jumping Everywhere

Andy Warner
 

I recently had a similar problem, post recap.
My problem was that channel 2 was never on the screen.

People (myself included) were surprised that the gpib card would misbehave,
I tried reseating all the ribbon cables, but it did not help.

Since I will never use gpib on this scope, I just removed it and made a
blanking plate where the connector lived.

On Sun, Apr 19, 2020 at 00:09 Don N3DEB via groups.io <dbawatsonville=
yahoo.com@groups.io> wrote:

Found a service manual.

If anyone has some thoughts let me know.

Thanks



--
Andy


Re: 2465b possibly really stupid question (noob)

James Theonas
 

More good information! The Awesomeness is great in this group!

On Friday, May 15, 2020, 8:43:03 AM GMT+3, Chuck Harris <cfharris@...> wrote:

However, don't expect it to work if you try to use the automatic
parametric measurements on your 2465B.  The software will chase
its tail as it tries different sweep speeds and the calibrator
changes its frequency...

Good times!

-Chuck Harris

Siggi wrote:
On Thu, May 14, 2020 at 4:59 AM James Theonas via groups.io <jamestheonas=
yahoo.com@groups.io> wrote:

  Wow this thread has gone south. I didn't use alcohol of any sort. I used
clean benzine. No water, no residue, strong cleaning properties and
protects from corrosion...
The tangents here will drive you to drink!

I'll bet you didn't know that the calibrator on your 2465B allows you to
quickly verify the horizontal calibration of your scope?
It's derived from a crystal oscillator so it'll have sufficient accuracy to
verify your sweep speeds. For most of the horizontal sweep speed range,
it'll show you 5 repetitions of a square wave. Towards the faster sweep
speeds the signal starts looking fairly squirrelly, but you only need to
look at the rising edge against a graticule mark to verify the timing
accuracy.




Re: Looking for a better in circuit ESR meter

Randy.AB9GO
 

PS. At one time I was doing the eBay try to find a good used one for less
money. Go ahead and buy the new one. There were several circuit updates
implemented later in the products lifetime. upon careful investigation
most of the ones listed on eBay do not have these updates. In addition the
older models are much harder on the battery. The only way to get decent
life is to run Eveready Energizer lithium cells and those do not come
cheap.

@AB9GO


This message sent to you from my mobile device via speech-to-text
technology.

On Fri, May 15, 2020, 9:05 AM Randy AB9GO <@AB9GO> wrote:

I purchased one of those a few months ago and it is an excellent meter
well worth the money.

@AB9GO

This message sent to you from my mobile device via speech-to-text
technology.


Re: 7A13 Vs W Plugin

Eric
 

Michael

Looks like I might have missed something. I am using the -00 let me get a copy of the -01 and have a read through got all the way to step 26 before the lack of W became an issue. Time to go read through the 01.


Eric

On 5/14/2020 10:41 PM, Michael W. Lynch via groups.io wrote:
Eric,

Which manual are you using? I have the later -01 version and it does not reference that scope or plugin under the required equipment for Performance Check/Calibration.

Page 5-1 EQUIPMENT LIST paragraph #3 Oscilloscope Requirements List TYPE 422 or TYPE 453 or TYPE 561B w/2A63/2B67. Scope requirements are not at all rigorous.

What am I missing?


Re: Looking for a better in circuit ESR meter

Randy.AB9GO
 

I purchased one of those a few months ago and it is an excellent meter well
worth the money.

@AB9GO

This message sent to you from my mobile device via speech-to-text
technology.


Re: TM515 mod UB

 

It is a GPIB connector to connect to the CG551-AP, and that's exactly what Mod UB does.

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jim Ford
Sent: 15 May 2020 06:36
To: TekScopes@groups.io
Subject: [TekScopes] TM515 mod UB

Hi, everybody.

Does anybody know what mod UB is on the TM515? John Gord from this
group gave me a TM515 last year, and I finally got a PS501-1 to go in
it. (Thanks, John!)

It says mod UB on the back, and TekWiki says the CG551AP plug-in
requires a TM515 mod UB or some other mainframes to work properly. But
it doesn't say what mod UB is.

Now, my TM515 has a connector on the back that looks like a GPIB
connector, so I'm hoping mod UB connects the appropriate pins from the
"GPIB" connector to the plug-in slots, so TM5000 plug-ins can be
controlled or read by GPIB.

Another anomaly is that the PS501-1 works OK in the 2 left compartments,
although the 5 V output is kind of unstable, but the 5 V output reads
about 0.7 V in the right 3 slots. Is this normal? Not that I really
need the 5 V fixed output anyway (who uses full-voltage TTL anymore?).

Thanks a bunch.

Jim Ford


Re: TM515 mod UB

 

On Fri, May 15, 2020 at 07:36 AM, Jim Ford wrote:


Does anybody know what mod UB is on the TM515?
http://www.hakanh.com/dl/docs/custommods/TM515modUB.pdf

/Håkan