Date   
Re: Probe ground sockets for UHF etc

mosaicmerc
 

Those look interesting but they aren't for the same purpose. The item I'm considering represents hi fidelity, low inductance, test points built into prototypes or products as opposed to general probing.

Having upwards of a 1/2" of ground lead is too much in many instances.

Re: Probe ground sockets for UHF etc

mosaicmerc
 

Ebay item 381511180538 looks similar, but doesn't provide the flexibility of a fit to many probe diameters.
Also the $5 cost ea. incl shipping is significant.

A sub $0.10 cost is what I hope to achieve....but perhaps a sub $0.25 is more realistic at startup.

Re: Probe ground sockets for UHF etc

 

I feel your pain.

Tektronix and LeCroy make them but their prices are outrageous unless
you have a budget for new equipment and probes. They are often
constructed like Peltola sockets.

131-2766-03 2.5mm Subminiature probe tip circuit board test points (2)
<http://www.testpath.com/Items/Circuit-Board-Test-Points-Subminiature-Probe-Tip-118-718.htm>

131-5031-00 3.5mm Compact Probe Tip Circuit Board Test Points (25)
<http://www.alliedelec.com/tektronix-131-5031-00/70137195/>

131-4353-00 5mm Circuit Board Test Point (25)
<http://www.alliedelec.com/tektronix-131-4353-00/70137194/>

<https://store.teledynelecroy.com/products/pk007-015-pcb-adapter-pkg-of-25>
<https://store.teledynelecroy.com/products/pk106-4-probe-tip-to-pcb-adapter>

On 05 Oct 2016 12:35:56 -0700, you wrote:

Hi all:
In my quest for RF capability and competencies I have found that wrapping buss wire to make a probe ground socket for UHF, RF prototyping or test points is useful to a point. But the potential for each hand made 'socket' to have slightly different inductance properties can factor in negatively when evaluating a signal path.

So I ask this:

Would a precision manufactured (stamped) brass cylinder or cuboid with a 1 point, 2 point or 4 point solder connection be something the market (aka: you guys are a sample) would be interested in?

Initially I see this as a stamp and roll or fold operation which permits expansion of the socket to fit the probe ground sleeve and allows the 'legs' to be bent/snipped for SMT installation as needed.

Perhaps just a couple sizes would fit the majority of HF probe diameters due to the unsealed edge of the socket.

I'd want to keep the retail piece cost under 10 cents in quantities of >50, but that figure has no feasibility behind it in terms of volume at this stage.

Any input is appreciated.

Tek Scope Cal using Ballantine 6124B

Bill (Doc) Courtright
 

Hello,
Does anyone have experience with using the Ballantine 6125B Time and Amplitude Test Set for Tektronix scopes and plug ins? I have the 6125 and want to do cal checks and adjustments on my collection of 7K mainframes and plug ins over the winter. It appears to be working ok but even old calibrators need calibration too. I do have a copy of the manual as well. I can certainly check the timebase output with a counter and measure the amplitude easy enough.

Thanks,
Bill, KB3DKS

Re: P6201 Repairability

Nathan Johnson
 

Thanks other David! I completely missed the significance of C120.
Nathan KK4REY

via Newton Mail [https://cloudmagic.com/k/d/mailapp?ct=pi&cv=9.1.9&pv=10.0.1&source=email_footer_2]

On Wed, Oct 5, 2016 at 13:05, David DiGiacomo telists@... [TekScopes] <TekScopes@...> wrote:
On Wed, Oct 5, 2016 at 12:47 PM, Nathan Johnson <jdownj@...> wrote:
David, I'm still trying to wrap my head around the fT issue. Nothing in the p6201 manual indicates that the MMBF4416 is selected in any way, yet calculating fT from data sheet min-max indicates a range from 179-298mhz(if I am doing it right). I thought that a transistor(of any type) was useless above its fT? Certainly a long way to go to the 900mhz that the probe is rated at.
I'm a different David, but FETs don't really have an ft. The figure
of merit the other David mentioned is only a starting point for
analysis.

In the case of the P6201, note that HF signals are fed forward through
C120, bypassing the FET.




[Non-text portions of this message have been removed]

Re: Probe ground sockets for UHF etc

Tom Gardner
 

On 05/10/16 21:26, 'Dennis Tillman' @Dennis_Tillman_W7PF [TekScopes] wrote:

What also works for VHF work is the 013-0085-xx Tektronix Bayonet Ground
Assembly. I find it to be clumsy because it requires that you apply constant
pressure to the probe and there has to be a ground within 0.25" of the
signal you are measuring.
Personally I prefer the HP near equivalents
https://entertaininghacks.files.wordpress.com/2015/03/hp10431.jpg
https://entertaininghacks.files.wordpress.com/2015/03/hp10020.jpg
but I haven't tried
https://entertaininghacks.files.wordpress.com/2015/03/n2878ablade.png

Constant pressure is still required, but there is useful flexibility about the ground plane's distance and probe's angle.

I like the hp10020 variant sufficiently that I made a 3d printed equivalent for generic *10 "high" impedance probes, which works surprisingly well.

Re: Probe ground sockets for UHF etc

 

Hi Ancel,

What you are describing sounds exactly like a 131-2766-03 ECB to Probe Tip
Adaptor. QService in Greece is selling them on Ebay for $6.00. You can see a
picture as well. It is eBay item number: 38151118053 (I have no affiliation
with the seller, etc.). There are 3 other listings at the moment.

You will have to find a pin jack for the probe tip to go into for your
design. One of these may work:
Mill-Max 0.015-.022" pin, Mouser Part #575-055220
Mill-Max 0.022-.034" pin, Mouser Part #575-0293015
Mill-Max 0.032-.046" pin, Mouser Part #575-031400

What also works for VHF work is the 013-0085-xx Tektronix Bayonet Ground
Assembly. I find it to be clumsy because it requires that you apply constant
pressure to the probe and there has to be a ground within 0.25" of the
signal you are measuring.

Good luck with your idea.
Dennis Tillman W7PF

-----Original Message-----
Sent: Wednesday, October 05, 2016 12:36 PM
Subject: [TekScopes] Probe ground sockets for UHF etc

Hi all:
In my quest for RF capability and competencies I have found that wrapping
buss wire to make a probe ground socket for UHF, RF prototyping or test
points is useful to a point. But the potential for each hand made 'socket'
to have slightly different inductance properties can factor in negatively
when evaluating a signal path.

So I ask this:

Would a precision manufactured (stamped) brass cylinder or cuboid with a 1
point, 2 point or 4 point solder connection be something the market (aka:
you guys are a sample) would be interested in?

Initially I see this as a stamp and roll or fold operation which permits
expansion of the socket to fit the probe ground sleeve and allows the 'legs'
to be bent/snipped for SMT installation as needed.

Perhaps just a couple sizes would fit the majority of HF probe diameters due
to the unsealed edge of the socket.

I'd want to keep the retail piece cost under 10 cents in quantities of >50,
but that figure has no feasibility behind it in terms of volume at this
stage.

Any input is appreciated.
------------------------------------
Posted by: mosaicmerc@...
------------------------------------

Re: 2465A is it fixable?

Daniel Kolbach
 

For the price I would buy it. I don't know what is your knowledge of electronics. With luck it can only be recapping, but you will need another scope if something else is wrong with it.
If you part the scope you can make some money, just the screen and some of the hybrid circuits can go for 30-50$ each. The tube is also valuable.

Re: Nobody talks about their 54xx units

 

Hi Rick,
The 5000 series of scopes are definitely under-appreciated and generally
ignored by scope users. I forgot to mention there are some capabilities you
can't get with a 7000 series plugin that the 5000 series plugins can give
you:
* The 5D10 Waveform Digitizer has several very long timebase speeds (up to
50 Sec/Div) which is great for very slowly changing waveforms. When combined
with the plugins digital storage feature you can use your scope like it was
a chart recorder.
* The 5B42 has Delayed Sweep and Differential Time Measurement capability.
You need two timebase plugins to get this in a 7000 series scope.
* The 5B44 is a true INDEPENDENT dual timebase (two completely separate
timebases in one plugin).

There are some interesting features a few of the 5000 series mainframes
have:
* The 5116 can display waveforms in 3 colors when used with the 5D10.
* The 5223 GPIB mainframe has digital storage and GPIB capability.

It is good to know I have a 5223 GPIB mainframe and all the 5000 series
plugins to use with it for the times when I need a special capability that
my 7000 scopes and plugins don't have.

The 5000 series of scopes are definitely under-appreciated and generally
ignored by scope users because they were overshadowed by the 7000 series,
but it is a very capable and flexible product line in its own right.

Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, October 04, 2016 8:01 PM
Subject: RE: [TekScopes] Nobody talks about their 54xx units

Hi Rick,

No, You are not missing anything at all.

The 5100 and 5400 scopes share a broad selection of plugins that will be
very useful for what you are doing. In addition to the obvious plugins you
probably already have other useful plugins to consider acquiring are the
5L4N Spectrum Analyzer with built in Sweep Generator, the 5CT1N
Semiconductor Curve Tracer, 5A22N Differential Amplifier, and the 5D10
Waveform Digitizer. Of course a pair of 5A14N plugins gives you 8 separate
channels which can be handy when troubleshooting logic circuits.

The best (and as far as I know, only) web site devoted to the 5100/5400
series is the one maintained by Cristian Weagle called IceNine. It is at

http://www.i9t.net/5000_scopes.html

Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, October 04, 2016 7:25 PM
Subject: [TekScopes] Nobody talks about their 54xx units

I'm a new subscriber with an old 5440 I had for 20 years. I'm fixing and
refreshing it and in the process of what all the topics go by that nobody
seems to be messing with the 54xx series. I like this thing and don't want
to give up on it, but I can't help thinking maybe I'm missing something from
the newer units. I mostly work on old guitar amps for fun. So I've never
saw the need to upgrade to 100Mhz. Am I really missing anything?

------------------------------------
Posted by: rpbale@...
------------------------------------

Re: 2465A is it fixable?

mosaicmerc
 

Buy it dude.
I have one and a half 2465s to part out with good hybrids, PSU, knobs, CRT..you name it. Forum price.
The whole one powers up with no errors, but I get some HF triggering instability. The PSU on it is already recapped. No doubt repairable, but I have a recapped 2465A, a Rigol DS2302A - maxed options, Rigol 1102D and 1052E, and a TDS694C. So the 2465s are taking up space.

Ancel

Probe ground sockets for UHF etc

mosaicmerc
 

Hi all:
In my quest for RF capability and competencies I have found that wrapping buss wire to make a probe ground socket for UHF, RF prototyping or test points is useful to a point. But the potential for each hand made 'socket' to have slightly different inductance properties can factor in negatively when evaluating a signal path.


So I ask this:



Would a precision manufactured (stamped) brass cylinder or cuboid with a 1 point, 2 point or 4 point solder connection be something the market (aka: you guys are a sample) would be interested in?

Initially I see this as a stamp and roll or fold operation which permits expansion of the socket to fit the probe ground sleeve and allows the 'legs' to be bent/snipped for SMT installation as needed.

Perhaps just a couple sizes would fit the majority of HF probe diameters due to the unsealed edge of the socket.



I'd want to keep the retail piece cost under 10 cents in quantities of >50, but that figure has no feasibility behind it in terms of volume at this stage.



Any input is appreciated.

Re: 2465A is it fixable?

 

It also comes with the document case, those often go for about $40 all by
themselves on Ebay.

Re: Hello from newcomer Fabio Trevisan - My first Tek Scope 464 + DM44

Fabio Trevisan
 

Hello Dave,
Just to let you know that I just ordered that HV transformer from Sphere.
It's shipping to my in-law's in Toronto, and she will be coming down to
Brazil in 2 weeks time.
The transformer costed 40% of what I paid for the whole 464... but heck...
I couldn't give up at this point.
I want to have a Tek scope and this is the first time I had chance to buy
one at
an affordable price.
So be it... it ended up not being a bargain, but it will still be cheap for
Brazilian standards.
I only hope that the CRT is not so worn out and that it will last enough
for my hobbyist use.

Talking about the CRT... I`ll reply to your answer on my other thread, on
this subject.
I want to explore what are my chances of rejuvenating this CRT.

Rgrds,

Fabio


2016-10-05 1:16 GMT-03:00 David @DWH [TekScopes] <
TekScopes@...>:



On Tue, 4 Oct 2016 12:33:48 -0300, you wrote:

The HV transformer... between the HV winding (Cathode & PDA supply) and
the
600V bias winding...
Cold, it already measures 10~15uA under 3kV (A WARNING SIGN)
Hot...enter the Drum Roll... 400uA!!! and my test HV supply sags to 1500V!
It didn't take all the heating above to present the increased leakage...
Leakage skyrocketed after about 40 deg celsius.

So... I think I (we) have a culprit!!!
At 400uA, this leakage alone is taking up 200% of the current actually
drawn by the HV circuit under normal operation.
That is a bummer. I try to rule out everything else which is what you
did before getting to the more difficult to test and replace
transformer.

Usually the transformers fail in a more definitive way.

P.S. I didn't have to resort to my Kenwood's HV supply...
I found a broken mosquito zapper (HV racket) hanging around (the racket
was
bent and shorting).
It delivers about 3200V from 2 x AA batteries and it's safe (not connected
to mains and low power)
That is a great idea.

So I think now I`ll have to order one transformer from Sphere.ca.
I see that Sphere has NOS (new old stock) 120-0909-01 transformers in
stock. I checked QService and they do not have any.

The $65 price from Sphere for the transformer is greater than some
past 464 and 466 sales on Ebay.

------------------------------
Posted by: David <@DWH>

Re: DM501A problem

Szabolcs Szigeti
 

Hi David,

The LD122 in mine has a datecode of 8530, and other ICs are around the same date.
There are actually three modifications in this. One it the LD122+external opamp buffer. Te second is a diode on the clock input (pin 8) of the LD121 to clamp the clock signal to +5V. The third is a resistor array to pull up D2, D3, D4, and D5 to +5V on the LD121.


All of these are tacked to the solder side of the PCB.


Szabolcs

Re: P6201 Repairability

David DiGiacomo
 

On Wed, Oct 5, 2016 at 12:47 PM, Nathan Johnson <jdownj@...> wrote:
David, I'm still trying to wrap my head around the fT issue. Nothing in the p6201 manual indicates that the MMBF4416 is selected in any way, yet calculating fT from data sheet min-max indicates a range from 179-298mhz(if I am doing it right). I thought that a transistor(of any type) was useless above its fT? Certainly a long way to go to the 900mhz that the probe is rated at.
I'm a different David, but FETs don't really have an ft. The figure
of merit the other David mentioned is only a starting point for
analysis.

In the case of the P6201, note that HF signals are fed forward through
C120, bypassing the FET.

Re: P6201 Repairability

Nathan Johnson
 

David, I'm still trying to wrap my head around the fT issue. Nothing in the p6201 manual indicates that the MMBF4416 is selected in any way, yet calculating fT from data sheet min-max indicates a range from 179-298mhz(if I am doing it right). I thought that a transistor(of any type) was useless above its fT? Certainly a long way to go to the 900mhz that the probe is rated at.
I'm looking for an original Motorola data sheet, as this is what Tek used, but I can't imagine it being that much better than the Fairchild version.
Nathan KK4REY
via Newton Mail [https://cloudmagic.com/k/d/mailapp?ct=pi&cv=9.1.9&pv=10.0.1&source=email_footer_2]
On Wed, Oct 5, 2016 at 05:13, @Raymond [TekScopes] <TekScopes@...> wrote:
I haven't dug that far into one yet, as far as the procedure, but the tips
on the 6201 are replaceable, the full kit came with replacement tips. Tucker
has 1 or 2
The P6201 tip is a screw-in type, the P6202(A) uses a push-in type (206-0230-03). At least one kit for the P6202(A) is available on the 'bay: "Tektronix P6202A Active Probe Replacement Tip Set (NOS)".

Raymond







[Non-text portions of this message have been removed]

Re: 2465A is it fixable?

 

I think it is repairable for less than $100.  Probably much less.  There are a few custom IC's (such as U800) that could drive the cost but they are untested at this time so its unknown.  My best guess is it needs new caps (less than $30) and a new battery (less than $15) plus a miscellaneous part in the high voltage (say $10).  I cant predict the cost to repair the DMM functions but I dont think they are necessary for a good scope anyway.  And you get the fun and satisfaction of changing out these things.  If it cant be repaired you can resell the manual, ($20 to 40) and pouch ($25 to $40) then part out the rest.  But give someone else a chance to repair it before parting it out.I would buy it.    

From: "go_boating_fast@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, October 5, 2016 11:39 AM
Subject: [TekScopes] 2465A is it fixable?

  There is a non working 2465A about a half hour from me for sale for $40. I am considering buying it if there is some chance it can be fixed. What do you folks think?
(I don't need it, but well, another Tek scope hmmm...)
Bob
favorite this post Tektronix 2465A oscilloscope - $40 (Robla) hide this posting unhide http://sacramento.craigslist.org/ele/5813061124.html



http://sacramento.craigslist.org/ele/5813061124.html

favorite this post Tektronix 2465A oscilloscope - $40 (R... http://sacramento.craigslist.org/ele/5813061124.html Hello, thanks for looking. Here is a good looking 2465A 4-channel oscilloscope. Scope powers up partially, but does not complete self test. I believe the high volt...



View on sacramento.craigslis... http://sacramento.craigslist.org/ele/5813061124.html
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[Non-text portions of this message have been removed]

Re: 2465A is it fixable?

Dan Rae
 

On 10/5/2016 9:39 AM, go_boating_fast@... [TekScopes] wrote:
There is a non working 2465A about a half hour from me for sale for $40. I am considering buying it if there is some chance it can be fixed. What do you folks think?
(I don't need it, but well, another Tek scope hmmm...)
Bob
favorite this post Tektronix 2465A oscilloscope - $40 (Robla) hide this posting unhide http://sacramento.craigslist.org/ele/5813061124.html
Given that the pictures would indicate it comes with the service manual I'd say it is well worth it. Apart from anything else it will almost certainly need the power supply recapped and calibration...

I paid $65 for a swap meet 2465ACT and thought it was a bargain :^)

Dan

Re: PG506 low serial number, Voltage reference

Daniel Kolbach
 

Ok, thanks for the pointers.

Re: Fairchild 3814 Replacement

Dave Wise
 

What makes you say that?

Thanks,
Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Tuesday, October 04, 2016 8:57 PM
To: TekScopes@...
Subject: Re: [TekScopes] Fairchild 3814 Replacement

The 14-bit SAR ADC in the EFM8LB10F16E is really a 10-bits ADC in disguise.

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Posted by: David <@DWH>
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