There is not a lot of drive behind the signal. It is generated by 4 tubes
in parallel so impedance mismatches will do very strange things. Properly
terminated it will put out 100 volt + square Waves mine hits about 108. It
can be used to drive the tunnel diode pulser for scope calibration. Use
mine all the time.
Eric.
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On Thu, Mar 18, 2021, 11:07 AM Dave Daniel <kc0wjn@...> wrote: Look at the manual, page 1-4. It lists both > 12v and > 120v depending on
the termination (this does seem odd to me).
DaveD
On Mar 18, 2021, at 11:01, Stephen <stephen.nabet@...> wrote:
On Thu, Mar 18, 2021 at 03:21 AM, Raymond Domp Frank wrote:
On Thu, Mar 18, 2021 at 03:07 PM, Stephen wrote:
It¡¯s should be 120V, not 12V...
I don¡¯t know if someone here has access to correct the page, but I just
thought I¡¯d mention it.
According to the specifications (Tek catalog 1970), 12V is the correct value.
You have to realize that with a duty cycle around 50% (the 106 goes
from less
than 45% to more than 55%), average *output* power would be above 140W!
And
that with a rise time of 12ns? Nice!
Raymond
Raymond,
I read what¡®s written on the machine... >= 120V, <12ns into 50ohms.
Forgive my lack of knowledge, or maybe my lack of understanding, but
would 12V be considered ¡°High Amplitude¡±?
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Look at the manual, page 1-4. It lists both > 12v and > 120v depending on the termination (this does seem odd to me).
DaveD
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On Mar 18, 2021, at 11:01, Stephen <stephen.nabet@...> wrote:
On Thu, Mar 18, 2021 at 03:21 AM, Raymond Domp Frank wrote:
On Thu, Mar 18, 2021 at 03:07 PM, Stephen wrote:
It¡¯s should be 120V, not 12V...
I don¡¯t know if someone here has access to correct the page, but I just
thought I¡¯d mention it.
According to the specifications (Tek catalog 1970), 12V is the correct value.
You have to realize that with a duty cycle around 50% (the 106 goes from less
than 45% to more than 55%), average *output* power would be above 140W! And
that with a rise time of 12ns? Nice!
Raymond
Raymond,
I read what¡®s written on the machine... >= 120V, <12ns into 50ohms.
Forgive my lack of knowledge, or maybe my lack of understanding, but would 12V be considered ¡°High Amplitude¡±?
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Re: 485 super weak brightness control
On Thu, Mar 18, 2021 at 7:43 AM Ondrej Pavelka <info@...> wrote: Power supply fan.
Is quite picky, it sometimes runs and sometimes it does not.
Here's what I did with the fan in my 485: /g/TekScopes/message/119458. Getting it out is a bit of a PITA, though.
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Re: Alert for 519 owners - The significance of the Gold GR Connectors
Hi All, One of my three 519's does indeed have gold coated 125ohm GR connectors - the step gen, ext trig, and signal input. This scope came from the LANL Black Hole and has SN1054. Having taken a closer look, those three may not be original and perhaps are replacements. I will check out the other two later. - T I will check out Dr. Timothy Koeth Assistant Professor Material Science & Engineering Institute for Research in Electronics and Applied Physics University of Maryland 301-405-4952 (office) 609-577-8790 (cell) radiation.umd.edu Amateur radio call sign K0ETH "K-zero-ETH" (formerly N2LPN) On Thu, Mar 18, 2021 at 10:51 AM Dennis Tillman W7pF <dennis@...> wrote: As far as I know none of the 519s had gold on their front panel GR
connectors.
You can easily tell the difference between a 50 ohm and a 125 ohm
impedance GR connector by looking at the inner conductor whether they are
gold or not.
Additionally a 125ohm GR connector will not mate with a 50 ohm GR
connector because the inner conductor fingers are the wrong size to mate
properly.
Dennis Tillman W7pF
--
Dennis Tillman W7pF
TekScopes Moderator
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On Thu, Mar 18, 2021 at 03:21 AM, Raymond Domp Frank wrote:
On Thu, Mar 18, 2021 at 03:07 PM, Stephen wrote:
It¡¯s should be 120V, not 12V...
I don¡¯t know if someone here has access to correct the page, but I just
thought I¡¯d mention it.
According to the specifications (Tek catalog 1970), 12V is the correct value.
You have to realize that with a duty cycle around 50% (the 106 goes from less
than 45% to more than 55%), average *output* power would be above 140W! And
that with a rise time of 12ns? Nice!
Raymond
Raymond, I read what¡®s written on the machine... >= 120V, <12ns into 50ohms. Forgive my lack of knowledge, or maybe my lack of understanding, but would 12V be considered ¡°High Amplitude¡±?
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Re: Alert for 519 owners - The significance of the Gold GR Connectors
As far as I know none of the 519s had gold on their front panel GR connectors.
You can easily tell the difference between a 50 ohm and a 125 ohm impedance GR connector by looking at the inner conductor whether they are gold or not.
Additionally a 125ohm GR connector will not mate with a 50 ohm GR connector because the inner conductor fingers are the wrong size to mate properly.
Dennis Tillman W7pF
--
Dennis Tillman W7pF
TekScopes Moderator
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Re: Type 111 Pretrigger Pulse Generator
And it was installed to replace the fixed increment control, instead of the variable control, which explains why fixed increment is inoperative. Very interesting.
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On Thu, Mar 18, 2021 at 07:42 AM, Sean Turner wrote:
Aha! Mystery solved. Apparently whoever installed the mod didn't also install
the new front panel label (or it fell off). I never occurred to me to try to
pull on the knob; sure enough it pulls out!
Thanks!
Sean
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Re: Type 111 Pretrigger Pulse Generator
Aha! Mystery solved. Apparently whoever installed the mod didn't also install the new front panel label (or it fell off). I never occurred to me to try to pull on the knob; sure enough it pulls out!
Thanks!
Sean
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On Thu, Mar 18, 2021 at 12:22 AM, Tim Phillips wrote:
From Tim P (UK)
Hi; This is the mod to supply double pulse output. See Hakan's page
I think it was used to set up the loop gain on samplers.
Tim
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Re: TM500 Board Set- 3D printed plastic face plate
On Thu, Mar 18, 2021 at 06:47 AM, David C. Partridge wrote:
If no-one has spares what material is recommended for 3d printing and what
units should I use for the STL file?
David, Not in the UK or EU, so I cannot be much help with a panel. I did print a panel for my project . I used PETG and imported the STL File into CURA for slicing. My CURA slicer is set up to use "metric" dimensions. The STL file supplied had all the holes in the right place. I did make a modification to the back side of the panel using TINKERCAD. -- Michael Lynch Dardanelle, AR
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On Thu, Mar 18, 2021 at 03:07 PM, Stephen wrote:
It¡¯s should be 120V, not 12V...
I don¡¯t know if someone here has access to correct the page, but I just
thought I¡¯d mention it.
According to the specifications (Tek catalog 1970), 12V is the correct value. You have to realize that with a duty cycle around 50% (the 106 goes from less than 45% to more than 55%), average *output* power would be above 140W! And that with a rise time of 12ns? Nice! Raymond
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Hey TT, I'm excited to hear what you find. In particular, if you look at the LCS_CSEL1/0 lines, it should be possible to know whether the display is refreshed RGB or RGBW (for some permutation of RGB). Happy hunting, Siggi On Thu, Mar 18, 2021 at 9:11 AM durechenew via groups.io <durechenew= [email protected]> wrote: Thanks Siggi; your conclusion is matching mine. I'll go the board and make
some real measurements (till now, mostly in my mind - with some few
exceptions).
TT
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BTW, while researching this, I noticed a small error on the TekWiki page.
It states the following:
¡° High Amplitude Output: 12 V into 50 ¦¸ load, 12 ns rise time, 600 ¦¸ output impedance, GR-874 connector¡±
It¡¯s should be 120V, not 12V...
I don¡¯t know if someone here has access to correct the page, but I just thought I¡¯d mention it.
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I kept the gr connectors on the fast rise but good quality bnc is good to 4
Ghz so I changed the high output one for ease of hookup. Just needed a
quick adaptor plate.
Eric
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On Thu, Mar 18, 2021, 10:02 AM Stephen <stephen.nabet@...> wrote: Yesterday I picked up from eBay a Type 106 High Amplitude (120v into
50ohm), Fast Rise Square Wave Generator.
I haven¡¯t received it from Germany yet.
I¡¯m wondering whether I should keep the original low reflection GR-874,
and get a GR-874 to BNC adaptor for it, or convert it to BNC¡¯s. I know the
Fast Rise outputs are mounted on the board, probably to further minimize
the reflection, and are harder to convert.
But wouldn¡¯t a BNC adapter, like a conversion to BNC, defeat the purpose,
and add reflection??
Also, it comes in a rather unusual (to me) case, which does appear to be
stock.
/g/TekScopes/album?id=261997
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Yesterday I picked up from eBay a Type 106 High Amplitude (120v into 50ohm), Fast Rise Square Wave Generator. I haven¡¯t received it from Germany yet. I¡¯m wondering whether I should keep the original low reflection GR-874, and get a GR-874 to BNC adaptor for it, or convert it to BNC¡¯s. I know the Fast Rise outputs are mounted on the board, probably to further minimize the reflection, and are harder to convert. But wouldn¡¯t a BNC adapter, like a conversion to BNC, defeat the purpose, and add reflection?? Also, it comes in a rather unusual (to me) case, which does appear to be stock. /g/TekScopes/album?id=261997
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Thanks Jeff,
I haven¡¯t ordered anything yet. I¡¯m waiting for my list of needed stuff to get a bit bigger and order everything at the same time. I¡¯ll keep that in mind though. Thank you.
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The SMA are much larger then the SMB, aren¡¯t they??
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The SMB-BNC cables I ordered from Amazon arrived and they do fit my DC505, but they are very tight, almost impossible to disconnect using just my fingers. Where/are the outputs on the DC505 infrequently used?
The specific cables that I bought (KNARCO) seem to be out of stock now, but I see another (even less expensive) listing from LIVISN. The odd company names (and the price) make me suspect that these are Chinese sellers, but I have no proof of that. The cables I ordered came somewhat inexplicably triple bagged: first a small bubble wrap bag, enclosed in a sealed anti-static bag, and finally in a blue and white ziplock bag.
-- Jeff Dutky
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Thanks Siggi; your conclusion is matching mine. I'll go the board and make some real measurements (till now, mostly in my mind - with some few exceptions).
TT
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Re: TM500 Board Set- 3D printed plastic face plate
Did anyone in Europe (or better UK) get the inner front panel 3D printed? If so did you have to get more than one printed? If so I'd be interested to buy one of them? If no-one has spares what material is recommended for 3d printing and what units should I use for the STL file?
Thanks
David----
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Jared Cabot via groups.io Sent: 17 February 2021 15:31 To: [email protected]Subject: Re: [TekScopes] TM500 Board Set- 3D printed plastic face plate Ok, I've corrected the dimensions in the manual now. The PCB's were made from the latest revision, but I pulled the dimensions from the 3D files just before that final tweak. The manual has been updated with the correct dimension, so f you download v1.5, it should all match up now.
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Re: 485 super weak brightness control
So..... I changed following diodes for BAV21 and there was no change to the
behaviour.
CR1651
CR1646
CR1664
CR1666
CR1660
CR1656
CR1652
No intensity control and no grid bias control. I was desperate but then I
noticed there's another one hiding covered by a cap CR1663 and that was the
one!! Now I have nice sharp trace and working intensity control!
I need to calibrate it, I can get good image but as soon as I change either
of the intensity controls it gets blurry.
Now with the HV supply sorted I can progress further with the list of
problems
Vertical amp Channel 1 is in top condition all LEDs working lightbulb
working
Vertical amp channel 2 has the 1x LED gone and lightbulb gone. Otherwise
cleaning brought it back to 100% working order.
Horizontal A sweep
Works flawlessly from 5second to about 10uS. From 5uS the image starts ever
so slightly moving to the right but I still get enough to fill the full
screen when I use the horizontal position control because there is a
reserve, at 10nS I pretty much run out of the reserve. I can still center
it to have full 10 divisions but there is no reserve at all.
The 5 2 and 1nS settings are not working at all.
Horizontal B sweep.
I don't get any B sweep from 5s to 20ms then I get good B sweep for 10mS to
0.2uS
0.1uS to 10nS is showing only first 4 divisions from the left
5 2 and 1 ns is working correctly.
The delay time position potenciometer is not in best shape, it gets stuck
quite often and needs to be wiggled about to move it further. The latching
is somehow damaged.
Power supply fan.
Is quite picky, it sometimes runs and sometimes it does not.
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On Wed, 17 Mar 2021, 19:17 Ozan, <ozan_g@...> wrote:
Trust me it's the phones auto correct turning opamp into obama :)
I know I was just kidding. I also had my share of funny auto correct
stories.
I think I had the timebase measurements AC coupled and there was no change
in level. I haven't checked the DC. I will do that tomorrow when I'm back
at the workshop. The goal is to find if sweep trigger is not coming (no gate) or sweep
trigger comes but sweep doesn't happen. DC levels are important to
understand the state of the sweep circuit.
At the end most likely it will be a dirty switch. You can make a good
guess which one by looking sheet <10> and see which switches only change in
the last three settings. However, we can also pinpoint which one by
electrical debug.
BAV21 looks OK as a replacement, it has better specs in some areas. The
swing at the restorer input is ~ 100Vpp max, so the diodes in the grid bias
area will not see more than 200V. Close to max spec but could be a good
initial debug step. If others see a problem please chime in.
Ozan
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Michael W. Lynch
Raymond Domp Frank
David C. Partridge