On 03/15/2013 02:37 AM, Mark Wendt wrote: On 03/14/2013 03:18 PM, John Miles wrote:
Actually the software's free from
. I was using a 2430A when I wrote it, so it's definitely compatible.
The last three plots on the page at are
from my 2430A, for instance.
If you set your 2440A to talk/listen mode at address 4, you should be
able to use the built-in F2 keyboard shortcut to request plots from it
without any further configuration hassles.
Of course, "free" means you get to deal with my personal (lack of)
user interface conventions. :) There are also some reasonably priced
options like for those whose time is worth
more.
Hardware-wise, you can use either a National Instruments board or
Prologix adapter, either of which can be had in the $200 or less
category. GPIB gives you a lot of bang for the buck, especially if
you can amortize the investment across several instruments.
-- john, KE5FX
A buddy of mine and I were discussing this not that long ago.
Another option, if you're a Unix/Linux kinda guy, is the Linux-GPIB
software at:
<>
Hardware-wise, there's a bunch of options:
USB to GPIB:
<>
Ethernet to GPIB:
<>
Or if you want a drop-in card, there's a bunch out there, but expect to
pay more (new) than the two other options above.
Mark
I advice AGAINST the prologix adapters. Their I/O model is garbage.. effectively negating the intent of asynchronous use and making it polling. DNU I would recommend a used NI GPIB-PCI board off eBay to use it the right way, IMO.
|
I've also been known to replace the
fiberglass with a normal grocery-store style wooden skewer. Then
ones I have are exactly the same size.
Respectfully,
Cliff White, W5CNW
On 03/18/2013 03:37 PM, Dan Aldrich wrote:
toggle quoted message
Show quoted text
Thank you for all the suggestions. I think I will try the tubing.
With a bit of luck, might even be able to do it a part gripper and
not need tearing down down the scope.
Now to find a cover...
-d
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Re: How to upgrade a 7854 to opt 2D
There are two versions of board A29 divided at 7854 serial number
B085124 and below but the schematics are basically identical. DG181
is the part number used for a bunch of the analog multiplexors. The
newer version replaced the LF13333 multiplexor (U1720) with a pair of
DG181 multiplexors (U2 and U3).
Accounting for the minor part number differences:
I think you will find the problem around U1620A or *U1720* on
schematic 34. I have read about reliability problems with the
*LF13333* before. There are old posts in the message archive about
possible substitutions for it.
The TL072 used for U1620 has lots of possible replacements including
the TL082 and any number of other FET and MOSFET input operational
amplifiers.
There could be a bad part in the networks surrounding U1620A.
toggle quoted message
Show quoted text
On Mon, 18 Mar 2013 19:51:21 -0000, "g_kupka" <ghm1@...> wrote: Hi David,
On "my" schematic 34 there is no U1620A or U2 and no D181 or U3.
I found the TL 72 OpAmp.
I have a U900 aa vertical D/A converter an a U1010 as horizontal D/A converter.
Gerhard
--- In TekScopes@..., David <davidwhess@...> wrote:
I assume that the character display works correctly even when the
stored signal has no or a low vertical deflection.
I think you will find the problem around U1620A or U2 on schematic 34.
If reseating those ICs or the A40 connections does not resolve the
problem, then you could swap U2 with a different DG181 like U3 to see
if the problem moves to the horizontal axis. I have read about
reliability problems with the DG181 before.
The TL072 used for U1620 has lots of possible replacements including
the TL082 and any number of other FET and MOSFET input operational
amplifiers.
There could be a bad part in the networks surrounding U1620A.
On Mon, 18 Mar 2013 16:44:53 -0000, "g_kupka" <ghm1@...> wrote:
After a warmup time of approx 2 hours the stored signal is displayed in the stored mode but only with an ampltude of 35% of the applied signal.
Gerhard
--- In TekScopes@..., "g_kupka" <ghm1@> wrote:
I swapped the RAM Board and now the 2nd 7854 has the opt 2D.
The 1st 7854 has still the problem, that it doesn't display the stored signal in the store mode, it shows only a horizontal line.
Where can I find the failure?
Many thanks.
Gerhard
--- In TekScopes@..., "David C. Partridge" <david.partridge@> wrote:
Yes
Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of g_kupka
Sent: 17 March 2013 10:22
To: TekScopes@...
Subject: [TekScopes] How to upgrade a 7854 to opt 2D
I have two 7854.
1st one opt 2D(extended memory):
I can store a signal, but it doesn't show the stored signal in the store mode, it shows only a horizontal line.
2nd one opt 78(P11 CRT):
It works well. Can I upgrade this mainframe to opt 2D by swapping the memory board from the 1st one to the 2nd one?
Gerhard
------------------------------------
Yahoo! Groups Links
|
I'm thinking of buying the parts to refurb my 2465A, but I wanted to know if the parts documented in the 2465B restoration PDF have a good chance of being the same. The service manual I have does not specify the board level component values, so I thought I'd get all the parts before I start the work (once I take it apart I would rather just get the work done). Serial number is B0144xx.
|
Thank you for all the suggestions. I think I will try the tubing. With a bit of luck, might even be able to do it a part gripper and not need tearing down down the scope.
Now to find a cover...
-d
|
I'm sure I'm being a dummy, but I suddenly am getting no signal continuity through the spring hook tip when placed on one of my P6133 probes. I'm just about certain I used this same spring clip on this same probe when I cal'd the probe using the cal signal on the scope. The probe itself is fine if I remove the clip and touch the probe tip to the cal point. But when I put the clip housing back on I get nothing. I even tried it on my other 6133 and nothing.
|
I often use silicon fuel tubings as used for miniature (1:8) petrol racing cars. Make sure the inner diameter is small enough to give a tight fit and use length of 1 - 1.5", so it won't slip. Wall thickness is often .1", which is a good thing.
Alternatively, many 7000-series plug-in modules contain the same couplers and parts units can be had for pennies.
Raymond
toggle quoted message
Show quoted text
--- In TekScopes@..., "Tom Jobe" <tomjobe@...> wrote:
Those fragile plastic flex connectors are impossible to find as far as I know, but I question whether a flex coupler is even needed there. The VAR shaft from the knob back to that flex connector is a piece of 1/8" fiberglass rod which I imagine takes care of the insulation out to the knob, so maybe a normal aluminum connector would be just fine. The fiberglass rod should take care of any misalignment too.
The last 1/8" shaft connectors I bought were from Veronia Northern but I'm sure you can get them from others.
Part number 376-0029-00 on this page:
These are those connectors with two set screws, that look like a piece of thick wall aluminum tubing.
tom jobe...
----- Original Message -----
From: Dan Aldrich
To: TekScopes@...
Sent: Monday, March 18, 2013 6:04 AM
Subject: [TekScopes] New 466 owner
Just picked up a 466 over the weekend. Works fine, but the only
problem was the Var knob on CH 2 is broken. Opened it up and saw it
was the coupler that connects the two shafts that's broken. Is there
a source for the couplers? I might just leave it alone as it looks
like a real pain to get down to the Ch 2 stuff.
Thanks,
-d
|
Re: How to upgrade a 7854 to opt 2D
Hi David,
On "my" schematic 34 there is no U1620A or U2 and no D181 or U3.
I found the TL 72 OpAmp.
I have a U900 aa vertical D/A converter an a U1010 as horizontal D/A converter.
Gerhard
toggle quoted message
Show quoted text
--- In TekScopes@..., David <davidwhess@...> wrote:
I assume that the character display works correctly even when the
stored signal has no or a low vertical deflection.
I think you will find the problem around U1620A or U2 on schematic 34.
If reseating those ICs or the A40 connections does not resolve the
problem, then you could swap U2 with a different DG181 like U3 to see
if the problem moves to the horizontal axis. I have read about
reliability problems with the DG181 before.
The TL072 used for U1620 has lots of possible replacements including
the TL082 and any number of other FET and MOSFET input operational
amplifiers.
There could be a bad part in the networks surrounding U1620A.
On Mon, 18 Mar 2013 16:44:53 -0000, "g_kupka" <ghm1@...> wrote:
After a warmup time of approx 2 hours the stored signal is displayed in the stored mode but only with an ampltude of 35% of the applied signal.
Gerhard
--- In TekScopes@..., "g_kupka" <ghm1@> wrote:
I swapped the RAM Board and now the 2nd 7854 has the opt 2D.
The 1st 7854 has still the problem, that it doesn't display the stored signal in the store mode, it shows only a horizontal line.
Where can I find the failure?
Many thanks.
Gerhard
--- In TekScopes@..., "David C. Partridge" <david.partridge@> wrote:
Yes
Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of g_kupka
Sent: 17 March 2013 10:22
To: TekScopes@...
Subject: [TekScopes] How to upgrade a 7854 to opt 2D
I have two 7854.
1st one opt 2D(extended memory):
I can store a signal, but it doesn't show the stored signal in the store mode, it shows only a horizontal line.
2nd one opt 78(P11 CRT):
It works well. Can I upgrade this mainframe to opt 2D by swapping the memory board from the 1st one to the 2nd one?
Gerhard
|
Those fragile plastic flex connectors are impossible to find
as far as I know, but I question whether a flex coupler is even needed there.
The VAR shaft from the knob back to that flex connector?is a piece of 1/8"
fiberglass rod which I imagine takes care of the insulation out to the knob, so
maybe a normal aluminum connector would be just fine. The fiberglass
rod?should take care of any misalignment too.
The last 1/8" shaft connectors I bought were from Veronia
Northern but I'm sure you can get them from others.
Part number 376-0029-00 on this page:
These are those connectors with two set screws, that look like
a piece of thick wall aluminum tubing.
tom jobe...
?
?
?
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Monday, March 18, 2013 6:04
AM
Subject: [TekScopes] New 466 owner
?
Just picked up a 466 over the weekend. Works fine, but the only
problem
was the Var knob on CH 2 is broken. Opened it up and saw it
was the
coupler that connects the two shafts that's broken. Is there
a source for
the couplers? I might just leave it alone as it looks
like a real pain to
get down to the Ch 2 stuff.
Thanks,
-d
|
Re: How to upgrade a 7854 to opt 2D
I assume that the character display works correctly even when the
stored signal has no or a low vertical deflection.
I think you will find the problem around U1620A or U2 on schematic 34.
If reseating those ICs or the A40 connections does not resolve the
problem, then you could swap U2 with a different DG181 like U3 to see
if the problem moves to the horizontal axis. I have read about
reliability problems with the DG181 before.
The TL072 used for U1620 has lots of possible replacements including
the TL082 and any number of other FET and MOSFET input operational
amplifiers.
There could be a bad part in the networks surrounding U1620A.
toggle quoted message
Show quoted text
On Mon, 18 Mar 2013 16:44:53 -0000, "g_kupka" <ghm1@...> wrote: After a warmup time of approx 2 hours the stored signal is displayed in the stored mode but only with an ampltude of 35% of the applied signal.
Gerhard
--- In TekScopes@..., "g_kupka" <ghm1@...> wrote:
I swapped the RAM Board and now the 2nd 7854 has the opt 2D.
The 1st 7854 has still the problem, that it doesn't display the stored signal in the store mode, it shows only a horizontal line.
Where can I find the failure?
Many thanks.
Gerhard
--- In TekScopes@..., "David C. Partridge" <david.partridge@> wrote:
Yes
Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of g_kupka
Sent: 17 March 2013 10:22
To: TekScopes@...
Subject: [TekScopes] How to upgrade a 7854 to opt 2D
I have two 7854.
1st one opt 2D(extended memory):
I can store a signal, but it doesn't show the stored signal in the store mode, it shows only a horizontal line.
2nd one opt 78(P11 CRT):
It works well. Can I upgrade this mainframe to opt 2D by swapping the memory board from the 1st one to the 2nd one?
Gerhard
|
Re: How to upgrade a 7854 to opt 2D
After a warmup time of approx 2 hours the stored signal is displayed in the stored mode but only with an ampltude of 35% of the applied signal.
Gerhard
toggle quoted message
Show quoted text
--- In TekScopes@..., "g_kupka" <ghm1@...> wrote:
I swapped the RAM Board and now the 2nd 7854 has the opt 2D.
The 1st 7854 has still the problem, that it doesn't display the stored signal in the store mode, it shows only a horizontal line.
Where can I find the failure?
Many thanks.
Gerhard
--- In TekScopes@..., "David C. Partridge" <david.partridge@> wrote:
Yes
Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of g_kupka
Sent: 17 March 2013 10:22
To: TekScopes@...
Subject: [TekScopes] How to upgrade a 7854 to opt 2D
I have two 7854.
1st one opt 2D(extended memory):
I can store a signal, but it doesn't show the stored signal in the store mode, it shows only a horizontal line.
2nd one opt 78(P11 CRT):
It works well. Can I upgrade this mainframe to opt 2D by swapping the memory board from the 1st one to the 2nd one?
Gerhard
------------------------------------
Yahoo! Groups Links
|
2465 Failures & Serial Numbers
I find references to 2465s within a range of serial numbers having a "higher than normal" IC failure rate, but have been unable to find which serial numbers. Please point me in the right direction.
|
Re: How to upgrade a 7854 to opt 2D
I swapped the RAM Board and now the 2nd 7854 has the opt 2D.
The 1st 7854 has still the problem, that it doesn't display the stored signal in the store mode, it shows only a horizontal line.
Where can I find the failure?
Many thanks.
Gerhard
toggle quoted message
Show quoted text
--- In TekScopes@..., "David C. Partridge" <david.partridge@...> wrote:
Yes
Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of g_kupka
Sent: 17 March 2013 10:22
To: TekScopes@...
Subject: [TekScopes] How to upgrade a 7854 to opt 2D
I have two 7854.
1st one opt 2D(extended memory):
I can store a signal, but it doesn't show the stored signal in the store mode, it shows only a horizontal line.
2nd one opt 78(P11 CRT):
It works well. Can I upgrade this mainframe to opt 2D by swapping the memory board from the 1st one to the 2nd one?
Gerhard
------------------------------------
Yahoo! Groups Links
|
I'm looking for same item
Paul K0UYA
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Monday, March 18, 2013 8:04
AM
Subject: [TekScopes] New 466 owner
?
Just picked up a 466 over the weekend. Works fine, but the only
problem
was the Var knob on CH 2 is broken. Opened it up and saw it
was the
coupler that connects the two shafts that's broken. Is there
a source for
the couplers? I might just leave it alone as it looks
like a real pain to
get down to the Ch 2 stuff.
Thanks,
-d
|
Re: Free: collapsible viewing hood and dust cover for 453/4, Tekcamera C12 adapter
Items gone, thanks for all your responses.
Keith
|
Just picked up a 466 over the weekend. Works fine, but the only problem was the Var knob on CH 2 is broken. Opened it up and saw it was the coupler that connects the two shafts that's broken. Is there a source for the couplers? I might just leave it alone as it looks like a real pain to get down to the Ch 2 stuff.
Thanks,
-d
|
It is the same basic oscilloscope as a 2430, 2430A, 2432, and 2440. They pretty much all only differ in bandwidth and sample rate. The 2431L is a little different being a cost reduced version that lacks the hardware for peak detection, has no delayed time base, and is missing some other features. On Sun, 17 Mar 2013 22:15:17 -0400, Paul Amaranth <paul@...> wrote: I finally tracked down a shorted 2.7uf tant on the timebase board and got that
replaced today. After putting everything together it booted up and passed all
the self tests. I have it hooked up to my SG503 right now and it appears to
be functional (yay).
Now it will probably take me a week or so to figure out how to actually use
it, assuming nothing else fails in the meantime.
Anyone else have one of these? I don't recall seeing any mention recently.
Paul
|
Re: Tek 455 horizontal sweep power supply problem
Do you have a copy of the service manual? It has detailed disassembly
instructions in the maintenance section.
?
A good copy is here
?
?
What does the +32 volt unregulated supply look like? It should be up around
+52 volts or so. If not, check C-721, a 1000uF, 75 volt can.
?
HTH,
Tom
?
?
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Sunday, March 17, 2013 10:46
PM
Subject: [TekScopes] Tek 455 horizontal
sweep power supply problem
?
Hi,
My 455 that has performed perfectly for 18 years has developed a
problem with the horizontal sweep. It appears to be a bit compressed on both
sides and behaves like there is some oscillation on the left side of the
screen. The +95V power supply is down to 68V so I assume this is the source of
the problem. I am hoping it is not a problem with the HV transformer but just
an electrolytic cap that is failing.
I read some posts about this issue
several years ago but didn't read about a resolution to the problem. Does
anyone have experience with this and know what might be the cause of the power
supply low voltage?
Also, the components for the +95 power supply
appear to be under the CRT. Can anyone offer suggestions about how to
disassemble the scope to get to the main
board?
Thanks,
Ed
|
Tek 455 horizontal sweep power supply problem
Hi,
My 455 that has performed perfectly for 18 years has developed a problem with the horizontal sweep. It appears to be a bit compressed on both sides and behaves like there is some oscillation on the left side of the screen. The +95V power supply is down to 68V so I assume this is the source of the problem. I am hoping it is not a problem with the HV transformer but just an electrolytic cap that is failing.
I read some posts about this issue several years ago but didn't read about a resolution to the problem. Does anyone have experience with this and know what might be the cause of the power supply low voltage?
Also, the components for the +95 power supply appear to be under the CRT. Can anyone offer suggestions about how to disassemble the scope to get to the main board?
Thanks,
Ed
|
I finally tracked down a shorted 2.7uf tant on the timebase board and got that
replaced today. After putting everything together it booted up and passed all
the self tests. I have it hooked up to my SG503 right now and it appears to
be functional (yay).
Now it will probably take me a week or so to figure out how to actually use
it, assuming nothing else fails in the meantime.
Anyone else have one of these? I don't recall seeing any mention recently.
Paul
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
|
David Hess