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Re: Tek P6xxx probe reference question
Hi Dennis,
What I found in an accurate dimension for the probes is the diameter of the metal on the removable (replaceable) probe tip. Example - the P6137 (p/n 206-0378-00) is an accurate 3.5mm diameter. I won't put good money on it but any other dimensions of the probe plastic parts is far too large. I did come across a current link at the Tek site that covers probe replacement parts. It is at (selections at far right side of page). It seems to cover a fair cross-reference between probe models and diameters. You can also click on the scrunched diagram of the probe parts to expand to a readable size. I saved the enlarged diagrams to a "Tek Probes" folder and PDF'd each page as well. You can never tell when things like this will disappear. Part numbers and such for those items (i.e. probe tips, cables comp boxes) not called out on the probe-size-specific pages can be found on the first page by clicking on the link "Passive & Active Probe General Replacement Parts." It cross-references parts by each probe model number. In all this brings all of the data on the probes together. I think I have all of my questions answered. Thanks, Greg |
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Re: Tek P6xxx probe reference question
The full set of Tektronix catalogs are available in PDF form online at the TekWiki and other sites
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They are very useful for determining specs, prices and when the various instruments were offered. Dave Sent from a small flat thingy On Aug 26, 2019, at 09:30, Richard Tyner <shawneesdad@...> wrote: |
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Re: Tek P6xxx probe reference question
Hi,
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Perchance a Probewiki on the Tekwiki page? larry On Aug 26, 2019, at 9:30 AM, Richard Tyner <shawneesdad@...> wrote: |
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Re: FG502 Troubleshooting Help Requested
The charging and discharging currents for the timing capacitor have to pass through the switching circuitry of S155 so bad contacts there will stop the triangle generator working and the other waveforms all depend on the triangle generator. Measure the voltage drops across each of R140 and R175, this would show that the constant current sources are OK. Try this on different ranges since the current varies with the frequency range. The two voltage drops should be very similar. Measure the voltage at the junction of CR140/CR170 and at CR145/CR175, this shows whether the timing capacitor should be charging or discharging. Check that when you change the frequency dial the voltages at the outputs of U140 and U175 vary smoothly and approximately mirror each other, that should rule out a problem with the op-amps.
It sounds like you have a scope so monitor the emitter of Q210 while changing the frequency multiplier knob back and fore, you might see the occasional burst of activity even with poor contacts on S155. There could also be a problem with the circuitry for externally gating the triangle generator, if Q315 is socketed you could remove it since it should be non-conducting in normal non-gated operation. Roger |
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Re: 11801C and the T1331 error: lost factory TB calibration data.
Reg,
If you are out for exotic toys, try finding 1180x or CSA803x with fast calibrator. You can tell it apart visually by the calibrator jack being gold 3.5mm type instead of Nickel plated SMA. It's basically a TDR part of SD-24 in a separate enclosure used instead of regular calibrator. They are rare but not unique. Here's random example I have never found who and why did this and why this is not documented anywhere. Leo |
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Re: Tek 576 Curve Tracer HV Transformer winding
Chuck Harris
7934? That's like asking a cupcake baker to whip up a 20 layer wedding cake...
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I envision one 7934 tranny as taking a couple of days to make. -Chuck Harris Kyle Rhodes wrote: Hi Chuck, |
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Re: Tek P6xxx probe reference question
Hi Greg,
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Yes, for many years it was not clear what Tek was doing with their probes. I think the 3.5mm and 2.5mm probes were an attempt to make it clear from their description how big the probe diameter is rather than using less descriptive terms like "miniature" and "sub-miniature". I believe the 2.5mm and 3.5mm reference is to the probe's ground ring diameter. I am not near any probes that I can check at the moment so I might be wrong about this. I must admit I never checked this until now, but I can point you to much more information on their probes and how Tek ended up with so many different probes. Over the years there was a lot of pressure to: 1) Reduce the size (diameter mostly) of the probes so they could get into tighter spaces. 2) Reduce the circuit loading (capacitance mostly) from the probes. 3) Optimize the probe performance by designing some probes for specific scopes. 4) Create specialty probes for things like wafer probing, measuring digital signals with a logic analyzer. A more common example of these would be the P6015 High Voltage Probe or the P6021 current probe. 5) Provide enough accessories for each probe that the probes were very versatile. Things really got really complicated in the mid-1980s when there were so many different probes that it was hard to know which probes worked with which instruments. That is when Tek included a few pages in their catalogs that showed which probes were recommended for which instruments and which could be used (but were not optimal). Finally Tek had to do something better and towards the latter 1980s they added several pages to the probes section of their catalogs that explained the differences between the probes in a way that was helpful. What you should look for is in the Probes section of the later Tek catalogs. Not every Tek catalog has this information but by about 1989 and onward there was a page devoted to showing each probe size (miniature, subminiature, 3.5mm, 2.5mm, etc) and EVERY part and accessory for that probe and how they were all attached. It includes part numbers for each item in the drawings. I think the 3.5mm and 2.5mm probes were an attempt to make it clear from their description how big the probe diameter is rather than using less descriptive terms like "miniature" and "sub-miniature". I often have to refer to these pages myself when I am trying to figure out which accessory goes with which probe. Dennis Tillman W7PF -----Original Message-----
From: Greg Muir Sent: Saturday, August 24, 2019 5:26 PM I guess this is sort of an academic question about how Tek refers to their P6xxx probe series via a dimension. In several probe accessory references Tek Refers to some probes in the series as "2.5mm" and others as "3.5mm" probes. I am trying to figure out to what part of the probe these dimensions apply. i can't seem to find any dimension on the probe body that comes close to those referenced except possibly the length of the bare tip. Could this be it? Any ideas? Greg -- Dennis Tillman W7PF TekScopes Moderator |
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Re: Plug for 7CT1N captive lead?
Hi EJP,
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I can send you a new one for $15. Contact me OFF LIST if you want it at dennis at ridesoft dot com. Dennis Tillman W7PF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of EJP Sent: Saturday, August 24, 2019 11:21 PM To: [email protected] Subject: [TekScopes] Plug for 7CT1N captive lead? The plug has finally broken off the captive lead on my 7CT1N, the one that goes out to a vertical amp or time-base depending on which side you have it installed. I'm sure I'm not the first victim of this. I can obviously replace it with an ordinary BNC plug, and am doing so temporarily (I hope), but it rattles around etc., and it also has a redundant earth connection. I'm wondering if there is something more suitable, short of the unobtainium (I presume) entire 195-0095-00 assembly, that is maybe made of plastic and/or only has the inner connecting ring. Thanks in advance EJP -- Dennis Tillman W7PF TekScopes Moderator |
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Re: Tek 576 Curve Tracer HV Transformer winding
Hi Chuck,
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If you could wind a new HV transformer for the 7934 (as I understand it's the same one as the 7834), I'd gladly pay that for it. Thanks, Kyle -- KSR Amps / Rhodes Amplification, LLC Kyle Rhodes (513) 480-2677 kyle@... On Sun, Aug 25, 2019 at 10:45 AM Chuck Harris <cfharris@...> wrote:
If you guys are all willing to pay in the $200-300 range, like |
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Re: 11801C and the T1331 error: lost factory TB calibration data.
These are just toys for an old man. I bought my 11801 because of the CSA803A plots that you send out with your pulsers. I thought it was just *so* cool. I got lucky and picked up an 11801 with a bad NVRAM error for $145 delivered and a pair of SD-22s for $150 delivered. With some help from a UK member of the list I got the NVRAM replaced. To my delight it all works fine Except for the video display jitter I mentioned earlier.
I bought 4x SD-26 heads for $200 each, one of which would not calibrate correctly. The seller replaced it. Thursday I got my SD-24 which eliminates the issues of impedance mismatch using a tee to pick off reflections. I bought the 4x SD-26s to measure timing skew for various DSP filter topologies implemented on a Zynq for use in a DSO. After spending some time with an MSOX3104T and RTM3104 I am quite underwhelmed by what you get for $20K. So rather than complain, I'm going to fix the issue by writing proper FW. I have a 2nd 11801 sitting in CA at my sister's with an SD-22 or 26 head. I'm told one channel is wonky. but won't know for sure until I get it. I know it has an NVRAM error. I primarily got it as a parts mule. About all I can think of right now to do with an SD-32 is check my Leo Bodnar pulsers ;-) If I do get an SD-32 I'll try to build a faster rise time pulser than yours. I've read a bunch on non-linear pulse generators. I have had more sheer fun fooling around doing completely insignificant experiments with this beast than any other piece of electronics I have ever owned. Partly this is because a transmission line is the EM analog to the 1D plane layered medium problem in reflection seismology. So it's *very* familiar. Being able to see on the screen things I have calculated in countless numerical simulations is just a blast. Have Fun! Reg |
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Re: Plug for 7CT1N captive lead?
You can grind off the crimp where the outer ring holds a washer and a
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spring in place. Some can be clipped with heavy diagonal cutters, since the crimp weakens the brass.A cutoff wheel in a Dremel or similar Roto-tool works OK, as well.stick it on a BNC jack to hold it in place. A jack with a square flange can be rotated as you cut each 90 degrees. A small drill press vice is handy for tasks like this. I've used one to make cables for decades. :) On Sun, Aug 25, 2019 at 6:17 PM EJP <esmond.pitt@...> wrote:
'Gaffer tape' was a joke actually. I will use heatshrink tubing on it. |
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Re: Plug for 7CT1N captive lead?
Brute force helps! I have a memory of doing it many years ago by turning off the peaned over bit at the back of the locking ring but without a lathe you can just start filing and/or cutting the ring till you can split it off. It¡¯s loose and made of brass so it should give up without too much of a fight!
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Adrian Sent from an I-thingy On 25 Aug 2019, at 23:17, EJP <esmond.pitt@...> wrote: |
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Re: Plug for 7CT1N captive lead?
Roy Morgan
Roy sends.
On Aug 25, 2019, at 3:16 PM, Dave Seiter <d.seiter@...> wrote:In filmmaking, the ¡°gaffer¡± is the head electrician and/or lighting designer. I somewhat reluctantly add: If it should move and doesn¡¯t, use WD-40 If it moves and shouldn¡¯t, use duct tape |
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Re: Tek 576 Curve Tracer HV Transformer winding
Am I the "gentleman" in the 576 thread?
I asked a few questions, got the information and went along asking a friend if he could print the bobbin. Then out of scrapped stuff made a little manual winding machine and used soft rubber grommets to keep the bobbin in place. This was a very low-level thing IMHO not worth any detailed description. "Quick and dirty" No counting mechanism. I had to keep track of every turn I made. I counted the number of turns on each layer and wrote it down, adding up to the 1000 or so turns for the HV-winding. Simple but time consuming. I described how I separated the two core halfs. The winding diagram was uploaded to KO4BB. I described the special High Voltage winding process carefully and I have seen this procedure quoted by others. I might have some pictures of the bobbin but anyone with a ruler can determine the proper size for it. Sorry if I have offended anyone. Not my intention. Cheers Ulf Kylenfall SM6GXV |
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Q: covers for 555 power supply?
Hi all
At the last swap fest I got a 555 scope power supply without covers. Does anybody have covers for this, or for any unit with comparably sized covers? I can provide dimensions for the covers. I can used slightly distressed covers and I don't need a complete set -- I was just hoping to get close to a complete top and side cover set. Also I would accept suggestions for pieces I could modify to work, as I can do some sheetmetal work. My goal is to make an external power supply for a radio amplifier. Thanks and 73 Jim PS, and completely unrelated -- my sister gifted me an old Amana microwave oven, aid it looks like it would make a delightful chassis for an HF amp utilizing a glass-envelope tube so you could see through the door and watch the tube plate get red. Just a thought ... |
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