Date   

Re: Guernsey Island 2445

n4buq
 

Did all the Guernsey serial numbers begin with 8? Mine has a six-digit serial number that begins with 1.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Chuck Harris" <cfharris@...>
To: TekScopes@groups.io
Sent: Sunday, January 26, 2020 1:34:58 PM
Subject: Re: [TekScopes] Guernsey Island 2445

I am pretty sure that the last 5 digits between Guernsey
and Beaverton units are not unique, but rather, are sync'd
to each other so the change orders apply.

In other words, you can have a B012345 and an 8012345 scope,
and each will use the revisions specific to B012345.

They were in communication with each other.

-Chuck Harris

n4buq wrote:
My 2445 was made in Guernsey Island. In the manual I have, I notice there
are references to certain serial numbers for certain parts, etc., and that
that made me wonder if/how those would apply to the Guernsey model
numbers. I presume there was not a separate manual for those models,
correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ







Re: 2400 series Test 4 Fail 3,13, 1

Craig Cramb
 

It would probably be fine.

Thanks Chuck, it looks like there are some used and new ones from private sellers.

Craig

On Jan 26, 2020, at 1:20 PM, Chuck Harris <cfharris@...> wrote:

It would probably be fine.


Re: Guernsey Island 2445

Chuck Harris
 

I am pretty sure that the last 5 digits between Guernsey
and Beaverton units are not unique, but rather, are sync'd
to each other so the change orders apply.

In other words, you can have a B012345 and an 8012345 scope,
and each will use the revisions specific to B012345.

They were in communication with each other.

-Chuck Harris

n4buq wrote:

My 2445 was made in Guernsey Island. In the manual I have, I notice there are references to certain serial numbers for certain parts, etc., and that that made me wonder if/how those would apply to the Guernsey model numbers. I presume there was not a separate manual for those models, correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ





Re: Guernsey Island 2445

Colin Herbert
 

I believe that all of the manuals were printed in Beaverton, but I might be talking rubbish. The Guernsey products had either no beginning letter or the letter "G", where Beaverton-made items are "Bxxxxxx".

I think that the part-numbers are the same, wherever the equipment is made. Otherwise, I think Deane Kidd would have had something to say about it!

Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of n4buq
Sent: 26 January 2020 19:07
To: TekScopes@groups.io
Subject: [TekScopes] Guernsey Island 2445

My 2445 was made in Guernsey Island. In the manual I have, I notice there are references to certain serial numbers for certain parts, etc., and that that made me wonder if/how those would apply to the Guernsey model numbers. I presume there was not a separate manual for those models, correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ


Re: 2400 series Test 4 Fail 3,13, 1

Chuck Harris
 

It would probably be fine.

-Chuck Harris

Craig Cramb wrote:

The NEC uPD4364-20L draws 100ua max standby current.
The NEC uPD4364-20LL draws 50ua max standby current.

The D4464C-20 only draws 10ua standby current so maybe this would be a good choice to replace it with.

Craig


Guernsey Island 2445

n4buq
 

My 2445 was made in Guernsey Island. In the manual I have, I notice there are references to certain serial numbers for certain parts, etc., and that that made me wonder if/how those would apply to the Guernsey model numbers. I presume there was not a separate manual for those models, correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ


Re: 11801 questions - funny fan noise and light

Gudjon Gudjonsson
 

Hi list

I bought a TM5000 and nearly started crying when I heard the noise :)
But I replaced the fan with a new 24V fan and the instrument is quiet
and lovely.
Plugged it directly to the 25V supply.

Has anyone replaced the 11801/CSA803 fan with a more quiet one?

Regards
Gudjon


TDS210 trigger pick-off

boid_twitty
 

Probably asked this before, but has anyone found a trigger pick-off method for TDS210-type scopes?

Although not the best where low levels are concerned, it's a hell of a lot easier to use than other scopes I'm dealing with. I'd like to wire a trigger output to drive more elaborate but less triggerable devices.

RL


Re: 2400 series Test 4 Fail 3,13, 1

Craig Cramb
 

The NEC uPD4364-20L draws 100ua max standby current.
The NEC uPD4364-20LL draws 50ua max standby current.

The D4464C-20 only draws 10ua standby current so maybe this would be a good choice to replace it with.

Craig

On Jan 26, 2020, at 11:40 AM, Craig Cramb via Groups.Io <electronixtoolbox=gmail.com@groups.io> wrote:

This post was originally was on 3 units that I was working on. The 2465a after replacing its ram, calibration issues were corrected.
This 2465B was doing the same things after going thru it’s calibration sequence so I changed it following the same path as the 2465a unit. The second post earlier in this thread is where I thought this must be the issue with both units. I couldn’t seem to locate the LL chip so just went with the L thinking it would be ok. I still have the original chip I removed.
The 2465A and 2465DM Ram chip were a D4464-20.

Craig


On Jan 26, 2020, at 10:29 AM, Chuck Harris <cfharris@...> wrote:

Why did you replace the original RAM chip?s


Re: 2400 series Test 4 Fail 3,13, 1

Craig Cramb
 

This post was originally was on 3 units that I was working on. The 2465a after replacing its ram, calibration issues were corrected.
This 2465B was doing the same things after going thru it’s calibration sequence so I changed it following the same path as the 2465a unit. The second post earlier in this thread is where I thought this must be the issue with both units. I couldn’t seem to locate the LL chip so just went with the L thinking it would be ok. I still have the original chip I removed.
The 2465A and 2465DM Ram chip were a D4464-20.

Craig

On Jan 26, 2020, at 10:29 AM, Chuck Harris <cfharris@...> wrote:

Why did you replace the original RAM chip?s


Re: 11801 questions - funny fan noise and light

Ragnar S
 

Thank you gentlemen for your replies!

So it is unclear if it is supposed to do this, but it is at least not
unheard of.

I checked the voltages on the feed wires to the fan relative chassis ground.
From start, the positive wire has about +6.3 V and the negative about +0.7 V.
When the fan revving occurs, the negative wire goes to about -6 V for about
35 ms, making a total voltage over the fan of about 12 V. For some reason
the pulses come irregularly, around 1 or a few times per second.

My current hypotheses is that the intention is to regulate the speed of
the fan, but I would be surprised if this actually is how it was designed
to work. It is somewhat annoying. :-)

Are there any schematics on these boxes to be found?


Also - the neon (?) light in the power supply, right behind the fan, that
starts to flicker as soon as it has power (also in standby mode) - do you
guys have that too?


Thanks for you help and best regards,

Ragnar

On 25 Jan 2020, at 16:01, Chuck Harris <cfharris@...> wrote:

Mine is normal until after the scope has been turned on for
about 30 minutes, and then it starts going "Brummm..... Brummm..."

I suspect a capacitor failure, as it is annoying, and would have
caused notice if it were a "normal" condition.

Annoying, though it may be, I can't see how it would cause any
harm... unless it presages a total failure.

What it isn't is a bearing failure, or lack of lubrication. My
fan spins for what seems like half a minute after power is turned
off.

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:
I don't recall mine ever doing that. I'm very sensitive to noise as I investigate anything I can't identify, so I think I would have noticed it.

A fan on one of my HP Z400 workstations was doing that. I shut it down to reduce the heat in the room and when I tried to boot it the fan was dead. I've not had time to correct it yet.

Good luck,
Reg




Re: P6201 probe Q100 FET replacement

Nenad Filipovic
 

Thanks for your inputs, the probe is working, I decided to go with the
datasheet and mounted the FET upside down. R150 had to be decreased from
2kOhm to about 1.45kOhm for proper biasing. It needs calibration though,
but for that I'd need to assemble a proper rig.

Best Regards,
Nenad


Re: 2400 series Test 4 Fail 3,13, 1

Chuck Harris
 

Details matter.

The NEC uPD4364-20L draws 100ua max standby current.
The NEC uPD4364-20LL draws 50ua max standby current.

The maximums are at maximum temperature, which in
this case is 70C. At room temperature, the current
will generally be much lower, but is not guaranteed
to be so.

Why did you replace the original RAM chip?

-Chuck Harris

Craig Cramb wrote:

Dealing with 3 scopes all having the Test4 Failures
2465A S/N B011512 Test4 Fail 3 (Fixed)
2465B S/N B010817 Test4 Fail 13 ( This Post)
2465A DM S/N B010824 Test 4 Fail 2 (Haven’t started)

Thank to all for the info in this post. This has been long journey but glad to see an underlying condition could be existing.
I’m looking at completing the repair of the 2465B instrument pre 50,000 S/N. Got started on it about 6 months ago troubleshooting with help from members. Did the repair by replacing the U2460 (original part # NEC D4364C-15LL, replaced with part # NEC D4364C-20L) and replaced the Dallas Keeper battery purchased from Mouser.
That was June 2019. Other things took my interest so just now getting back to calibration. After doing the required calibration I kept getting diagnostic
of test 04 fail 13, Test 04 fail 11, Test 06 fail 01, then back to test 04 fail 01. Couldn’t seem to get ahead of it. So did what I should have done before attempting the calibration and checked the battery voltage. Yea I found it at .6VDC. No wonder I’m dealing with these faults.
So now onto why would the battery be drained in 6 months. The old battery I removed that was from the 1988 vintage was in the same condition so I just thought changing it 6 months ago would allow for another 10 yrs. But that wasn’t the case. So tracing thru the circuit there isn’t anything that I see that would allow for a quick drain of this battery. Feeding two IC, an amplifier, and two caps. Not sure how long it took to drain the battery.

Craig




Re: 2465B - Weak Readout Intensity

tekscopegroup@...
 

On Sat, Jan 25, 2020 at 09:50 AM, <flanneltuba@...> wrote:

Also let me add my "+" to the massively informative, if not exasperatingly
long and multilayered EEVBlog "2465B Teardown" thread. I spent hours pouring
over that thread—hours well spent for anyone diving into a 2565B
restoration. It was that thread that essentially illustrated the finer points
of repairing the later model A5 board with its notorious leaky 'lytics.

- Scott
Only hours? I spent several days sequentially reading all the posts, then again I went from page 1 and on (didn't want to miss anything crucial) and taking notes along the way. Glad you found it was helpful information. If you got the time I would even suggest that you might send in your own adventure with your scope so it will be added to the thread for future reference. I don't recall anybody over there ever reporting anything similar to your case.


Re: Your generosity is STUNNING!

Lawrance A. Schneider
 

Mr. Pope wrote: And to think that I felt guilty about only being able to give $5.00.
I could not get anything to work; I made no contribution. Something about hidden email address; whatever!!!
++++++++++++
However!! Keep whatever (except for those wanting it back) and put in an account for future needs. This has become a huge amount of work for Mr. Tillman. SAVE YOUR EFFORTS for something more meaningful. We all love the group. Having money put away for the future saves work by not needing to do this again for a long time.

larry


Re: TDS3012B to TDS3052B upgrade

 

On Sun, Jan 26, 2020 at 04:55 AM, Tom B wrote:


I have seen a lot of postings from people who have upgraded the bandwidth of
their TDS3000 scopes with firmware.   I have a TDS3012B that I was thinking
about doing that with but it seems strange that you could go from 100MHz to
500MHz without any hardware changes.  What I want to know is; how well does
this work?  Are there any issues to watch out for?
I have done that upgrade on several TDS3000 scopes including my own TDS3014B. It works fine
and it does not need an adjustment after the change. It's done with GPIB. It can also be done on
TDS200 and TDS1000/2000 but they need a full adjustments sequence to be done.

I have written several softwares to do a Performance Check on most of the older TDS's and for
the TDS's mentioned above I included a procedure to change the type. Initially I had an idea to
charge a small fee for that specific function. I have later abandoned this idea but until the software
has been changed you will need to get a key from me.

Find it here: http://www.hakanh.com/dl/TDS_pv.htm

/Håkan


Re: Your generosity is STUNNING!

 

Jay: you don't get a 'show quoted text' button w/Dennis' mesg?
No, but I get the digest so perhaps that's why?


Re: FW: CRT database and Stan's Reprise database of 151 part numbers

tek_547
 

Very usefull piece of information, thanx!!
René


Re: Your generosity is STUNNING!

 

Hi Jay,
That's strange. I did include the context. Here is my complete reply (between the long dashed lines).
For some reason you didn't everything in my reply. I don't know why.
Could this be why we don’t get context when other people DO include it in their replies?

Dennis Tillman W7PF
--------------------------------------------------------------------------------

-----Original Message-----
From: Dennis Tillman W7PF [mailto:@Dennis_Tillman_W7pF]
Sent: Friday, January 24, 2020 10:40 PM
To: 'TekScopes@groups.io' <TekScopes@groups.io>
Subject: RE: [TekScopes] Your generosity is STUNNING!

Hi Dave,
Fortunately that day is very far off.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of DaveH52
Sent: Sunday, January 19, 2020 12:33 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Your generosity is STUNNING!

Maybe ask for just one dollar next time.
Enjoy your new DMM!
--------------------------------------------------------------------------------

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jay Walling via Groups.Io
Sent: Saturday, January 25, 2020 6:18 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Your generosity is STUNNING!

Hi Dave,
Fortunately that day is very far off.
Dennis Tillman W7PF
Say, didn't you just post about putting context in replies? ;^)

Jay





--
Dennis Tillman W7PF
TekScopes Moderator


Re: Your generosity is STUNNING!

 

Hi Larry,
Yes, I had no idea PayPal gave me a different transaction number that it gave you. This is why you could not find your transaction number in my list.
This is the information I have on your contribution (which I did receive):

### DENNIS' LOCAL TIME $$$ STATUS CONTRIBUTOR PAYPAL TRANSACTION
12 Tue 12/31/2019 12:32 AM $5.00 ACCEPT DONATION Larry McDavid 5L6310441C770780F

Thank you for your contribution,
Dennis

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Larry McDavid
Sent: Monday, January 20, 2020 11:43 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Your generosity is STUNNING!

I don't want to beat this issue to death, but the comment below is very interesting. I could not find my PayPal transaction number in the list either and I wrote Dennis privately to explain that. But, mine was *not* an international transaction; I live in California. My donated amount is a common amount so I could not identify it by the amount.

So, I wonder if PayPal changes *all* the transaction numbers. Did anyone actually find his transaction number in the list Dennis published?

It is gratifying that so many did donate and I fully support the reimbursement; it is money well deserved.

Larry W6FUB

On 1/20/2020 9:45 AM, Raymond Domp Frank wrote:
Dennis,
My transaction could well be
9SK43*******0851N $22.57 TO BE REFUNDED
That's the only transaction in your list for the amount that I transferred.
Siggi may be right in assuming that Paypal references change between sender and receiver (nice!) for international transactions....
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)