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Re: Tek Knob Project - scan and make
Kuba Ober
A polycarbonate or graphene-infused PLA insert would probably work, and instead of a clearance fit a tighter friction fit would be called for. I’m of the mind that given the low cost of replacements, a friction fit is all that’s needed. A drop of ABS juice/glue is all that’s needed to retain a knob worn out from multiple removals. Or just print a new one, they would be a few bucks each from a print service, or a dime or two when printed on your own printer.
Another idea that I’ve tried and was working OK is to have a locking sleeve where the knob has two parts, top part having a tapered slotted sleeve that fits the shaft, and the bottom part having a conical seat that compresses the sleeve. A snap latch interlocks these two, unfortunately for small knobs it’d be a single use part that has to be destroyed for servicing. Another option is, instead of a permanent latch, to have the bottom part do a twist-lock on the top part. This would allow for a few reassembles before it wears out to require replacement. That may be hard on the smallest of knobs. Probably the smallest knob this would work on is something like the 7000 plugin freestanding adjust knobs like hor/vert offset, trigger level, etc. It’d also need a slow print at 0.1mm or even 0.05mm layer height with a 0.1 or 0.2 nozzle. Regular friction fit knobs work OK printed with a 0.4 nozzle. The biggest deal would be to have the 3D models of existing parts and then the design of replacements is a separate and a much more limited task and can be easily applied to all the parts of a given class at once.
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Re: Groups io question
Does anyone else have this problem?
toggle quoted messageShow quoted text
Dennis Tillman W7PF
-----Original Message-----
Sent: Tuesday, December 19, 2017 11:01 AM Subject: [TekScopes] Groups io question I am not seeing my own posts in my email, even though I chose "All email" and "I always want copies of my own messages". I must have missed something! Phil -- Dennis Tillman W7PF TekScopes Moderator
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Re: 2454B 400MHz gives just about 300 MHz BW
Tam Hanna
Hello,
could it be one of the fake units by the hero seller at Ebay? Tam --- With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 6500 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/
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Re: 2454B 400MHz gives just about 300 MHz BW
victor.silva
It appears to be a real 2465B A1 board.
671-0722-08 is for the 2465B p/n 671-0720-08 would be the equivalent 2445B p/n Could be a failure in the CH1/CH2 channel switch hybrid. --Victor
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Groups io question
I am not seeing my own posts in my email, even though I chose "All email" and "I always want copies of my own messages".
I must have missed something! Phil
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Re: Questions regarding new group
Ian van der Neut
I just clicked "Email me a link to login" (or something similar, I forgot
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the exact words). Worked fine. Changed passwords, good to go.
On Tue, Dec 19, 2017 at 7:50 PM, Vince Vielhaber <vev@...> wrote:
--
One man's "magic" is another man's engineering. "Supernatural" is a null word. -- Excerpt from the notebooks of Lazarus Long, from Robert Heinlein's "Time Enough for Love"
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Re: Questions regarding new group
Vince Vielhaber
I just thought of something. Go to the groups.io home page and click on
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Log In. Go thru the Forgot Password steps and you'll be in. Vince.
BTW, if I go to the home page, it displays a message stating I'm not
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Re: 2454B 400MHz gives just about 300 MHz BW
victor.silva
Ulli,
I'll check the parts numbers when I get home. There is also another possibility -- if the CH1/CH2 switch fails it can impact the rise time of both channels. It will not allow proper adjustment of rise time to <0.87 ns. Typically I can adjust 2465Bs to the mid 0.70ns, some as low as 0.68ns. It's a tradeoff between risetime and flatness. When I see the failure I describe above in the channel switch the step response cannot be adjust below 1.2ns. --Victor
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Re: 7603 with noise in traces
Hi Dave,
toggle quoted messageShow quoted text
:2o Thanks for the warning... Actually, the 7601 came to me with the 7L13 installed!� I swapped the scope plugins in.� I think the fella I got this from swapped them while it was on his bench to show me... and hopefully that means that if there is a big fault, it's either fine, or it's too late. The 7L13 seems fine, but this rig is too new to me for me to really know that.� Sometimes, honesty is a bitch, huh? The guy I got this from worked for TRW and the 7603 is from there, when they downsized and he got it in lieu of some overtime pay, IIRC. The scope led an easy life in a lab and not bouncing around from person to person.� Three owners: TRW, him, and then me... hopefully that is good. Phil
On 12/19/2017 10:32 AM, Artekmedia wrote:
Phil
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Re: PG-506 Calibrator and Power Module Compatibility
@Arcticgeek
A picture would definitely help. I have 2 of these PG506 calibration generators - 1 is a very old one that is the original design (sn B01XXXX) and the other one is either a PG506 or PG506A. It is the newer display face, but the red bezel is broken off so I really don't know if it's a newer PG506 or a PG506A. At any rate, these should plug in fine to a regular TM501/503/504/506 mainframe, and there really isn't any way to change the keying on the connector. There is a way to change the keying on the power mainframe units, but I'm not aware of any way to make the keying unique on the plugin module. Are the "alignment pins" you mention the pins that are screwed in to the corners on the back? If so, I'd say it's very possible someone accidentally put those alignment pins in the wrong corners by accident, and if you move them you'll be just fine.
Good luck!
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Re: 7603 with noise in traces
Artekmedia <manuals@...>
Phil
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I dont want to make you paranoid but I would make sure I had the scope working with a good set of known every day plug-ins before I plugged in something as exotic and expensive as the 7L13. Just to be sure you dont have a funky voltage somewhere coming from the scope and zap your 7L13 which is REALLY no fun to troubleshoot. Talk about a blivit Dave
On 12/19/2017 1:23 PM, Phillip Potter wrote:
Hi Chris, --
Dave Manuals@... www.ArtekManuals.com
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Re: Questions regarding new group
Artekmedia <manuals@...>
Not really any different that the Yahoo groups. you got email over there but if you were not logged in yahoo groups you couldn't get to the various sub menus ( files photos etc) You may have had your computer / browser set up to auto log in the Yahoo groups and since it has been so long since you set it up the log in on yahoo groups was transparent to you ... The same can be the case with group .io if you allow save password in your browser
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Dave manuals@...
On 12/19/2017 1:08 PM, n4buq wrote:
BTW, if I go to the home page, it displays a message stating I'm not subscribed to this group (or any groups for that matter). Odd since I get the messages to my inbox... --
Dave Manuals@... www.ArtekManuals.com
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Re: 7603 with noise in traces
Hi Chris,
Thanks for the information. Glad to hear that, for the most part, what I am seeing is normal. The jumpiness in the image is constant, like a jitter. It is not bad, but I notice it and wonder if it is normal, too. I realize that this a an old scope, but IMO one of the best, and certainly the best I have even owned... If I only had a crane to pick it up. ;) I am going to trade out the scope plugins for a 7L13 analyzer plugin and see if it is jittery too. Again, thanks for your input! Phil
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Re: Questions regarding new group
Artekmedia <manuals@...>
On 12/19/2017 1:04 PM, n4buq wrote:
I went to the group.io homepage and can see the tekscopes messages, but am not seeing anything for photos or other files. Are those linked from the homepage?Yes they are linked to the home page Because you are a member of the Tekscopes.io community does not automatically make you a member of groups .io YES you need to create a groups.io membership this is not the same as being a Tekscopes member. I know it seems a bit out of sequence but that is because an existing group and it's membership were transferred from Yahoo. If you were a newbie seeking membership you would first join groups .io and then petition for acceptance to Tekscopes ( Yahoo was no different by the way) Once you are logged in to groups .IO then reopen the Tekscopes home page Group Home: https://groups.io/g/TekScopes Dave -- Dave Manuals@... www.ArtekManuals.com
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Re: Questions regarding new group
Vince Vielhaber
Don't log in as a google account. You've been here long enough that when
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Dennis originally set things up we all got an email with account setup info. Just click a link as I recall. Otherwise, set up an account using your email address, not a google, facebook, etc. login and things should happen for you. Until you've set up an account and you're a member, you won't see much. Vince.
BTW, if I go to the home page, it displays a message stating I'm not
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Re: Questions regarding new group
n4buq
BTW, if I go to the home page, it displays a message stating I'm not subscribed to this group (or any groups for that matter). Odd since I get the messages to my inbox...
toggle quoted messageShow quoted text
Thanks, Barry - N4BUQ
----- Original Message -----
From: "n4buq" <n4buq@...>
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Questions regarding new group
n4buq
Glad to see this is moving to a better platform.
I do, however, have a couple of questions about this. I went to the group.io homepage and can see the tekscopes messages, but am not seeing anything for photos or other files. Are those linked from the homepage? At the homepage, it has a login link. Do I need to create a groups.io membership? I tried logging in as a Google account, but that didn't seem to take me back to the tekscopes homepage and clicking back there didn't expose any new functionality that I saw so am curious what/if I need to do anything else. Thanks to all who made this possible! I'm sure I'll get the hang of it. Barry - N4BUQ
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Re: Protect your 575 curve tracer
bobkrassa
You can start to check if you have the fuses by removing the filter on the back of the scope, removing the little screws that hold the fan and moving the fan aside - no need to disconnect it. The fuses are short Buss fuses - the top two items on the diode board. You can't easily see this from the sides.
The fuses were provided with the diode board with mod kit 040-0223-00. There was another mod kit to just install the fuses, using a short ceramic strip on the underside of the chassis. I wonder if the transformer killing shorts were more common with the selenium rectifiers as that is a known failure mode. Still good to have as this is a high current 15 volt circuit. Bob Krassa ACØJL
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Re: 7904A readout bounce
NigelP
So, further investigation demonstrates more of what I've already noted. Scenario: 7904A loaded with 2x 7A26, 7B92A, 7D15 and ALT set on both vertical PIs and mainframe set to ALT...... if I overlay all four traces on top of each other there is NO bouncing of the readout . As you increment any trace position towards top/bottom of the screen the bounce gets increasingly larger reaching around 0.1 major division (therefore readout bounce magnitude is a direct function of trace vertical position). Sweep speed in the region of 50mS/Div +/- some shows up nicely, but any variation of sweep speed simply varies the level of visual annoyance. Any combination of ALT setting produces the same result.
Similarly, substituting a 0587 Signal Standardiser into either PI slot and set up to perform the handbook "Thermal Comp" procedure, as mooted earlier in the thread, the readout bounces away merrily to the step waveform rising/falling. Also using for example a single 7A26 set to CH1 and mainframe set to LEFT (so no ALT settings) the readout shifts up and down according to PI vertical position setting.... a direct and linear relationship between SHIFT potentiometer setting and readout vertical screen position. Readout movement is in anti-phase to trace shift movement.
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Re: c-12 camera
Hi , I saw those types but the ones I used and I am not sure if the first is a bona-fide 600 type --- 665 B/W with negative -- cant supply . Also the one really needed for fast work type 47 3000asa roll film ( can push to 10,000asa ) cant supply
From: Chuck Harris <cfharris@...> To: TekScopes@groups.io Sent: Tuesday, 19 December 2017, 16:12 Subject: Re: [TekScopes] Re: c-12 camera What exactly did you ask them? They seem to have: i-type in both color and B&W 600 in both color and B&W SX70 in color and B&W Spectra, though currently sold out 8x10, B&W, color sold out. I didn't see any sign of the old roll type of film, which would leave out any of the camera backs that used that film. 600 and SX70 were used in lots of scope and microscope camera backs. -Chuck Harris Brian via Groups.Io wrote: For the groups benefit , I have been in contact with Polaroid . Their reply is as follows :--- | | Virus-free. www.avg.com |
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