Date   

Re: ESR meters (again)

John Clark
 

Thanks Steve! Now I feel vindicated for also buying the Anatek Blue ESR meter! It was a bit expensive but I like it and had fun putting the kit together. I didn't get as deep into it as changing the display, but as I mentioned earlier, adding the auto shutoff on/off switch next to the power switch has worked very well and I just used it last week fixing my wife's 22 year old Oster 4811 breadmachine that liked to shut off somewhere in the middle of kneading the dough (makes the wife quite unhappy when she comes home and finds the dough for her dinner rolls not done!) Ended up replacing all 4 electrolytic caps that were in it. Two on the power supply board and two on the logic board. Only one was over it's ESR but replaced all of them anyway. Put a new seal in the bottom of the bread pan while I was at it. Should last her another 22 years! She loves her breadmaker and I love my Blue ESR meter!

John

To: TekScopes@...
From: TekScopes@...
Date: Mon, 4 Apr 2016 14:24:40 -0700
Subject: [TekScopes] Re: ESR meters (again)


























Hi Dave,


I purchased two ESR meters a couple weeks ago, after doing a ridiculous amount of web-surfing/research.








The convention wisdom I found on the web was "if you are a hobbyist and need to do accurate L,C,R, and ESR, then the DE-5000 offers the best value for the price". However, I bought the AnaTek Blue / DaveParker ESR meter last week (in kit form),








Anatek Blue ESR Meter - Full Kit for Self Assembly http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit





http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit





Anatek Blue ESR Meter - Full Kit for Self Assembly http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit Blue ESR Meter Kit for capacitor equivalent series resistance (ESR) measurements.











View on anatekinstruments.com http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit


Preview by Yahoo

















and just for giggles, I ordered an el-cheapo ESR meter from banggood.com (also in kit form).














DIY Multifunction Transistor Tester Kit For LCR ESR Transistor PWM Signal Generator M328 http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html





http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html





DIY Multifunction Transistor Tester Kit For LCR ESR Tra... http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html This is Meter Tester DIY Kit for Capacitance ESR Inductance Resistor. Measurement Range: Resistor: 0.5 ~ 50M. Capacitor: 30pF ~ 100mF. Indu...











View on www.banggood.com http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html


Preview by Yahoo











But banggood sent me a DIY DDS function generator kit instead, so I'm in the process of getting that resolved.











The AnaTek Blue ESR works great and is reasonably accurate (I checked some 1% resistors with it).


I'll do some comparisons once I receive and assemble my banggood ESR meter.








Now, a little story about the AnaTek Blue ESR:








During the assembly, I swapped out the supplied leads with some really nice silicon wire. Next I attempted to "upgrade" its blue 3mm decimal point LEDs. The supplied LEDs are a noticeably dim relative to the brightness of the 7-segment display. I had some very bright 3mm blue LEDs in my parts bins, and being a smart guy, I knew I could swap out the dim LED for a bright one, and if it was too bright, I could tone it down just by putting an appropriate resistor in series with the new LED.








Well, it was not that easy... "Brightness-matching" went okay, but new LEDs had a problem. When displaying something like (.05) it looked beautiful ! But When displaying something (0.5) the 1st LED would not go completely dark, but only when the 2nd LED was being illuminated to its proper level. I ended up with this (.0.5) on the display. I spent the next few hours looking at the schematic, probing the drive voltages and timing with my oscilloscope, soldering resistors and even 1N4148 diodes in series with the my bright LEDs, and generally trying to debug why that darn LED would not go out completely. Long story short: I understand how the display driver circuit operates, and I think there is small error in the design. I ended up putting the original "magic blue LEDs" back in the meter and all is well.








Anyway, that's my 2 cents.


-Steve



































































































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


Re: ESR meters (again)

stvn.czrt@...
 

Hi Dave,
I purchased two ESR meters a couple weeks ago, after doing a ridiculous amount of web-surfing/research.


The convention wisdom I found on the web was "if you are a hobbyist and need to do accurate L,C,R, and ESR, then the DE-5000 offers the best value for the price". However, I bought the AnaTek Blue / DaveParker ESR meter last week (in kit form),


Anatek Blue ESR Meter - Full Kit for Self Assembly http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit

http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit

Anatek Blue ESR Meter - Full Kit for Self Assembly http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit Blue ESR Meter Kit for capacitor equivalent series resistance (ESR) measurements.



View on anatekinstruments.com http://anatekinstruments.com/collections/business-industrial-electrical-test-equipment-electronic-components-electronic-component-tools/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit
Preview by Yahoo





and just for giggles, I ordered an el-cheapo ESR meter from banggood.com (also in kit form).




DIY Multifunction Transistor Tester Kit For LCR ESR Transistor PWM Signal Generator M328 http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html

http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html

DIY Multifunction Transistor Tester Kit For LCR ESR Tra... http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html This is Meter Tester DIY Kit for Capacitance ESR Inductance Resistor. Measurement Range: Resistor: 0.5Ω ~ 50MΩ. Capacitor: 30pF ~ 100mF. Indu...



View on www.banggood.com http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html
Preview by Yahoo



But banggood sent me a DIY DDS function generator kit instead, so I'm in the process of getting that resolved.



The AnaTek Blue ESR works great and is reasonably accurate (I checked some 1% resistors with it).
I'll do some comparisons once I receive and assemble my banggood ESR meter.


Now, a little story about the AnaTek Blue ESR:


During the assembly, I swapped out the supplied leads with some really nice silicon wire. Next I attempted to "upgrade" its blue 3mm decimal point LEDs. The supplied LEDs are a noticeably dim relative to the brightness of the 7-segment display. I had some very bright 3mm blue LEDs in my parts bins, and being a smart guy, I knew I could swap out the dim LED for a bright one, and if it was too bright, I could tone it down just by putting an appropriate resistor in series with the new LED.


Well, it was not that easy... "Brightness-matching" went okay, but new LEDs had a problem. When displaying something like (.05) it looked beautiful ! But When displaying something (0.5) the 1st LED would not go completely dark, but only when the 2nd LED was being illuminated to its proper level. I ended up with this (.0.5) on the display. I spent the next few hours looking at the schematic, probing the drive voltages and timing with my oscilloscope, soldering resistors and even 1N4148 diodes in series with the my bright LEDs, and generally trying to debug why that darn LED would not go out completely. Long story short: I understand how the display driver circuit operates, and I think there is small error in the design. I ended up putting the original "magic blue LEDs" back in the meter and all is well.


Anyway, that's my 2 cents.
-Steve


problem with parametric req on 2445B

John Ferguson
 

Feeding a 400 Hz sine wave from an FG 501 into channel one on my 2445B, I am able to measure voltage and frequency using the cursors and voltage using "MEASURE" but not frequency. Requesting frequency, I get CH1: SMALL OR LOW REP RATE SIGNAL.

Signal looks pretty good to me on the screen. What might be the problem?

John AI4TO


Re: AFG5101 Repair - photograph needed

Egge Siert
 


New file uploaded to TekScopes

TekScopes@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the TekScopes
group.


File : /7J20 Patent #3886331.pdf
Uploaded by : calibrationfixture <eggeja2@...>
Description : Addition to 7J20 & J20 Photo Album


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/TekScopes/files/7J20%20Patent%20%233886331.pdf


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


calibrationfixture <eggeja2@...>


Re: 2221 100MHz Scope repair project

satbeginner
 

Hi all,

I consider myself lucky, because today my 2221 I bought on Ebay -as defective- arrived.
The really good news: it is not broken at all.
I assume the previous owner just not knew what buttons to press to see the traces, or get them triggered.
Being on X-Y did not help either, I think.

Now to the things that DO need some attention: The broken knobs.

To make it complete I need the following 4 items:


- One of the Vertical "cal" knobs is damaged. The size is about 10mm at the bottom, 9mm at the top and 12mm high. Shaft diameter is appr. 3.1mm, 0.125".

- The little "Select" button, this is the one that selects which cursor to adjust. I could not find a partnumber for this so far. Shaft diameter is appr. 2mm, 0.078".

- the "Time Base" knob is damaged, the transparent 'skirt' is still OK. The size is about 18.2mm at the bottom (not including the skirt), 16.9mm at the top and 22mm high. Shaft diameter is 1/4", so 6.2mm.

- And finally, the Pull to x10, and rotate to adjust the calibration knob is missing. I believe the partnumber for this is 366-0641-00. The shaft diameter is 3.1mm, 0.125" too.

So far I found the first one on Ebay and with Qservice, but no luck for the other 3...

I hope somebody here can put me on the right track to obtain these missing items??

I try to include some pictures here:
https://groups.yahoo.com/neo/groups/TekScopes/photos/albums/491112086 https://groups.yahoo.com/neo/groups/TekScopes/photos/albums/491112086





Un saludo,

Leo


P620x pinout?

Mark Kahrs
 

So, does anyone know the connector pinout on the P620x series? I
believe it's a Hirose HR10 series but what are the pins?


Re: TDS 380 calibration and vertical scale problem

Siggi
 

On Mon, 4 Apr 2016 at 11:49 david.wilson92@... [TekScopes] <
TekScopes@...> wrote:

I have an update for the TDS 380

I almost removed one of the hybrids but never could get the last few so I
decided I would resolder all the joints and put this scope back together to
play around with. This is my first scope by the way and I couldn't resist
the curiosity of using this instrument. Also I want to thank all the great
people who helped me along the way in troubleshooting this scope, if
anything I learned a few things about troubleshooting scopes and about
buying used scopes off ebay. If I decide to buy once again I will try to be
a little more careful so that I don't get sucker scoped!
Hey David,

thanks for the update, and have fun with your 380.
Personally I'd never buy a scope in full working order, as that'd deprive
me of the opportunity to fix it and learn something new. My kids tease me
about this; "Dad, now that the scope's working, what good is it to you?",
or looking at eBay "Dad, that one is listed as good - that's no use to
you", and so on.
Now the TDS380 isn't an ideal beginner's fixer-upper, as you've found, so
maybe next go for one that is fully documented and less integrated. Like
perhaps a 465 or a 2400-series - as clearly you need at least one more
scope ;).

Siggi


Re: 7S12 TDR Cable

Nathan Johnson
 

I bought a 7854, two in fact in the past week, mostly because they are high on the want list for my collection, and they came up cheap on eBay. Going to be interesting, both claim to work, but only one was willing to provide images showing the self test completion. The 7854+TDR combo looks really nice on paper, will need to check it out in real life... And learn to use a 7854!
Nathan KK4REY

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On Mon, Apr 4, 2016 at 19:09, Craig Sawyers' c.sawyers@... [TekScopes] <TekScopes@...> wrote:
I assume that a failure would be "digital", either it works or it doesn't? I may have my hopes up a
little
bit high on this one... Tested working S-6 heads seem to go for more than I paid for the 7854 with
all
this installed..
Nathan KK4REY
Don't unnecessarily get concerned - it might work just fine and dandy. Mine does, in fact I was using
it today to see precisely how lousy BNC connectors can be.


Re: 7S12 TDR Cable

Craig Sawyers <c.sawyers@...>
 

I assume that a failure would be "digital", either it works or it doesn't? I may have my hopes up a
little
bit high on this one... Tested working S-6 heads seem to go for more than I paid for the 7854 with
all
this installed..
Nathan KK4REY
Don't unnecessarily get concerned - it might work just fine and dandy. Mine does, in fact I was using
it today to see precisely how lousy BNC connectors can be.


Re: 7S12 TDR Cable

Nathan Johnson
 

I assume that a failure would be "digital", either it works or it doesn't? I may have my hopes up a little bit high on this one... Tested working S-6 heads seem to go for more than I paid for the 7854 with all this installed..
Nathan KK4REY

Sent using CloudMagic Email [https://cloudmagic.com/k/d/mailapp?ct=pi&cv=7.4.15&pv=9.1&source=email_footer_2]
On Mon, Apr 4, 2016 at 18:58, Craig Sawyers' c.sawyers@... [TekScopes] <TekScopes@...> wrote:
So it may be a real
miracle if it arrives intact. I take it that the sampler is made out of tiny quantities of
unobtainium, no
chance for repair if it is screwed up?
Mine arrived without too - and survived because the guy at least bagged it in antistatic wrap. And
yes - not a chance of repair - the business end is an alumina thick film hybrid with 6 chip diodes
bonded onto it. It is unlike any conventional sampling bridge - the S4 and S6 work by a fast
travelling wave trapping charge on diodes as it propagates. The 1GHz S1, possibly S2 and definitely
S3 (because I fixed mine when it was DOA) are repairable because fast Agilent surface mount diodes can
be pressed into use. But the S4 and S6 are simply not possible.


Re: 7S12 TDR Cable

Craig Sawyers <c.sawyers@...>
 

So it may be a real
miracle if it arrives intact. I take it that the sampler is made out of tiny quantities of
unobtainium, no
chance for repair if it is screwed up?
Mine arrived without too - and survived because the guy at least bagged it in antistatic wrap. And
yes - not a chance of repair - the business end is an alumina thick film hybrid with 6 chip diodes
bonded onto it. It is unlike any conventional sampling bridge - the S4 and S6 work by a fast
travelling wave trapping charge on diodes as it propagates. The 1GHz S1, possibly S2 and definitely
S3 (because I fixed mine when it was DOA) are repairable because fast Agilent surface mount diodes can
be pressed into use. But the S4 and S6 are simply not possible.


Re: TDS 380 calibration and vertical scale problem

David Wilson
 

I have an update for the TDS 380

I almost removed one of the hybrids but never could get the last few so I decided I would resolder all the joints and put this scope back together to play around with. This is my first scope by the way and I couldn't resist the curiosity of using this instrument. Also I want to thank all the great people who helped me along the way in troubleshooting this scope, if anything I learned a few things about troubleshooting scopes and about buying used scopes off ebay. If I decide to buy once again I will try to be a little more careful so that I don't get sucker scoped!


Re: Question Regarding Vertical Centering - 2465B

n4buq
 

I see it now - under CAL07 (R2918 and/or R2931).

Thanks!
Barry - N4BUQ

----- Original Message -----
From: "'Tom Miller' tmiller11147@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Monday, April 4, 2016 10:35:26 AM
Subject: Re: [TekScopes] Question Regarding Vertical Centering - 2465B

The readout text is adjusted on the A5 controller board for the 2465B scope.
There are two pots, one for the size and one for position. They will not
affect the calibration.


----- Original Message -----
From: Barry n4buq@... [TekScopes]
To: TekScopes@...
Sent: Monday, April 04, 2016 9:20 AM
Subject: [TekScopes] Question Regarding Vertical Centering - 2465B



Is there a way to center just the text display independently of the trace
centering in the 2465B? The both bottom and top lines of text are
displaced several mm upward making the top text a bit hard to see if
looking at it from a slightly elevated position. There's a section that
describes vertical centering but not sure if that applies to the trace
only or both. If there's a way to simply recenter the text without
disturbing any calibrations for the trace, etc., I'd like to do that. If
not, and the one procedure covers both text and traces, then I'll just
follow that one but thought I'd ask first.

Thanks,
Barry - N4BUQ







Re: 7S12 TDR Cable

Nathan Johnson
 

I am well aware of that, I do have a bag of terminations on the way as well. Unfortunately the eBay seller does not know this, and it looks like it will be in transit without termination... So it may be a real miracle if it arrives intact. I take it that the sampler is made out of tiny quantities of unobtainium, no chance for repair if it is screwed up?
Nathan KK4REY

Sent using CloudMagic Email [https://cloudmagic.com/k/d/mailapp?ct=pi&cv=7.4.15&pv=9.1&source=email_footer_2]
On Mon, Apr 4, 2016 at 18:42, Craig Sawyers' c.sawyers@... [TekScopes] <TekScopes@...> wrote:
As I understand this, the interconnect cable being of a certain electrical length was to delay the
pulse
reaching the S-6 until after the trigger? So that would be satisfied by anything that delayed at
LEAST
750ps?
No - it is just a practical length of semi-rigid to go from the S52 to the S6. You have to use high
quality semi rigid though - you are trying to get low aberration 25ps rise time through it so
attenuation and return loss are important. This sort of thing
http://194.75.38.69/products/test_flex.shtml from Minicircuits probably the 5" version at $10

The "Test Line" is specced at 1ns, and I assume that this was to make the interconnection from
I think that is just part of the familiarisation - stick an unterminated line on the S6 and watch
the reflection come back.

What you definitely need to do is treat the S6 with utmost respect. They are static sensitive - in
fact Tek did an apps note 42W-5850 "Preventing Sampling Head Damage", and you can destroy an S6 with
static discharge from your finger, or a charged up bit of coax. I keep the inputs of the travelling
wave heads (S4 and S6) with a 50 ohm terminator on the inputs when not in use. I bought a bag of
cheap ones for precisely that. The other thing is to discharge any coax you connect to the input -
just short out ground to centre pin for a second before connecting to your S6.





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


Re: 7S12 TDR Cable

Craig Sawyers <c.sawyers@...>
 

As I understand this, the interconnect cable being of a certain electrical length was to delay the
pulse
reaching the S-6 until after the trigger? So that would be satisfied by anything that delayed at
LEAST
750ps?
No - it is just a practical length of semi-rigid to go from the S52 to the S6. You have to use high
quality semi rigid though - you are trying to get low aberration 25ps rise time through it so
attenuation and return loss are important. This sort of thing
http://194.75.38.69/products/test_flex.shtml from Minicircuits probably the 5" version at $10

The "Test Line" is specced at 1ns, and I assume that this was to make the interconnection from
I think that is just part of the familiarisation - stick an unterminated line on the S6 and watch
the reflection come back.

What you definitely need to do is treat the S6 with utmost respect. They are static sensitive - in
fact Tek did an apps note 42W-5850 "Preventing Sampling Head Damage", and you can destroy an S6 with
static discharge from your finger, or a charged up bit of coax. I keep the inputs of the travelling
wave heads (S4 and S6) with a 50 ohm terminator on the inputs when not in use. I bought a bag of
cheap ones for precisely that. The other thing is to discharge any coax you connect to the input -
just short out ground to centre pin for a second before connecting to your S6.


Re: Question Regarding Vertical Centering - 2465B

 

The readout text is adjusted on the A5 controller board for the 2465B scope. There are two pots, one for the size and one for position. They will not affect the calibration.

----- Original Message -----
From: Barry n4buq@... [TekScopes]
To: TekScopes@...
Sent: Monday, April 04, 2016 9:20 AM
Subject: [TekScopes] Question Regarding Vertical Centering - 2465B



Is there a way to center just the text display independently of the trace centering in the 2465B? The both bottom and top lines of text are displaced several mm upward making the top text a bit hard to see if looking at it from a slightly elevated position. There's a section that describes vertical centering but not sure if that applies to the trace only or both. If there's a way to simply recenter the text without disturbing any calibrations for the trace, etc., I'd like to do that. If not, and the one procedure covers both text and traces, then I'll just follow that one but thought I'd ask first.

Thanks,
Barry - N4BUQ




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


7S12 TDR Cable

Nathan Johnson
 

One of my new scope acquisitions(currently in transit) is coming with a
7S12/S-6/S-52 TDR setup. Of course no cables. Right now I'm looking at the
S-6 manual and looking at the interconnection diagram. It looks like I
should be using the 750ps cable(015-1017-01) and the "Test Line" cable
015-0123-00. Obviously these cables all got lost, and I can't locate any at
the moment. I've saved my searches and will keep an eye out. I'm trying to
understand the requirements of a replacement.
As I understand this, the interconnect cable being of a certain electrical
length was to delay the pulse reaching the S-6 until after the trigger? So
that would be satisfied by anything that delayed at LEAST 750ps? I have
some 6 inch RG-402 jumpers that using book figures for 402, should be
around 780-820ps. Hoping that will work, as I don't have anything to
measure the exact electrical length of a cable... Until I get the TDR
working. Go figure.
The "Test Line" is specced at 1ns, and I assume that this was to make the
interconnection from "trusted test gear" to "circuit under test" a
fixed/known distance from the sampler as well as avoiding too short a cable
total/too short pulse+reflection? I'm thinking that once I get this working
I can use a "roughly 1ns" cable to attach another cable to the end, and
trim to 1ns?
Any idea what the tolerances would be on these cables from the factory?
Nathan KK4REY

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[https://cloudmagic.com/k/d/mailapp?ct=pi&cv=7.4.15&pv=9.1&source=email_footer_2]


Question Regarding Vertical Centering - 2465B

n4buq
 

Is there a way to center just the text display independently of the trace centering in the 2465B? The both bottom and top lines of text are displaced several mm upward making the top text a bit hard to see if looking at it from a slightly elevated position. There's a section that describes vertical centering but not sure if that applies to the trace only or both. If there's a way to simply recenter the text without disturbing any calibrations for the trace, etc., I'd like to do that. If not, and the one procedure covers both text and traces, then I'll just follow that one but thought I'd ask first.

Thanks,
Barry - N4BUQ


Re: Updated SG504 Head 2 Head comparison

Michael A. Terrell
 

Some OEMs use 50 ohm BNC connectors for video, because they are harder to damage. Look at the photos of the two types and you will see the differences.

-----Original Message-----
From: "'Craig Sawyers' c.sawyers@... [TekScopes]" <TekScopes@...>
Sent: Mar 24, 2016 2:41 AM
To: TekScopes@...
Subject: RE: [TekScopes] Re: Updated SG504 Head 2 Head comparison

To this day I do not believe you can buy a true 50 ohm BNC connector. They are more like 51 or 52
ohms.
It is even worse with 75 ohm BNCs. I've tested several chassis sockets on the market using TDR
(7S12/S52/S6) and there are significant reflections within the connector body. Must try the same with
50 ohm ones.

Craig


Michael A. Terrell