Re: SG503 amplitude precision
I'm new here and I'm looking for someone to help me with my Tektronix 2465
DNS (aslo known as 2465 CTS )
I made few videos here:
about my sick scope.
Can anyone tell me where is a special group for my scope?
Thank you all for helping me and each others!
Have a great day!
Tony
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On Thu, Apr 25, 2019 at 9:17 PM Rick <rpbale@...> wrote: I may be a little late to the game but I posted this question to a Tek
expert on Youtube:
This comment/request might be a little out of scope, to calibrate a Tek
SG503 Tek says a special cable is required, Tek part 012-0482-00. This is
an extremely expensive 3 foot 50 ohm BNC cable, $200+ on ebay. There's a
discussion going on at TekScopes@... about the need for this cable
and thought this was right up your alley for a video. How do you make a
precision application cable in the home workshop? What is this cable doing
that another 3 foot 50 ohm terminated cable can't do? I'm a m addicted to
collecting Tek 500 series plugins for my home lab and have a SG503 and
would love to make one. Thanks and love your videos.
His reply:
w2aew
I looked up the engineering specs for that cable - doesn't look like
anything super special. 012-0482-00 refers to a 36" +/-0.5" long RG-58C/U
cable with BNC connectors and strain reliefs. The BNC connectors are to be
per MIL-C-39012 spec, which basically applies to most high-quality
(reputable manufacturer) connectors, rated to 4GHz, max insertion loss of
0.2dB at 3GHz, VSWR of 1.3:1 max with TFE insulation. Nothing super
special, just a 3' 50ohm coax made with quality materials.
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Re: [Test-Equipment] Suggestions for going through Tek2465DVS/DMM?
I have the same oscilloscope. It is also listed under (at least that is what I found today) as Tektronix 2465CTS (or 2465 CTS) .
Mine has some problems, sometimes I loose the text on top and bottom of the display and also the FIND BEAM gets stuck, so I don't know exactly where to find the solution.
Anyway, I hope your scope is working.
Tony Fleming
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Re: SG503 amplitude precision
Hello Jared and Rick,
Before you make an investment in this enterprise you are considering, you may want to go back to the beginning of these posts from 2015. It was categorically stated the the real 012-0480-00 is made from RG 223 although some discussion was given to improving it using RG 400. I own a genuine 012-0480-00 and it is stiffer than RG 58 (presumably because of the double shield in RG 223) and slightly larger in diameter .210 vs .200 for RG 58. Having made some cables from RG 223, I can also tell you that RG 223 takes a different BNC connector than RG 58 to do a workmanlike job. I am not trying to discourage you, simply to help you to avoid some missteps. I might even get one myself. By the way, the Tek cable is also very well made as you would expect with molded on plastic strain reliefs at either end.
Jack Reynolds
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Re: SG503 amplitude precision
Hmmm,
If that's the case, I have a crimper and dies for the high quality Canare brand 50ohm BNC.
I wonder if it's worth me making a batch of cables to send out for the cost of parts and shipping if there are enough people interested?
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Re: SG503 amplitude precision
I may be a little late to the game but I posted this question to a Tek expert on Youtube:
This comment/request might be a little out of scope, to calibrate a Tek SG503 Tek says a special cable is required, Tek part 012-0482-00. This is an extremely expensive 3 foot 50 ohm BNC cable, $200+ on ebay. There's a discussion going on at TekScopes@... about the need for this cable and thought this was right up your alley for a video. How do you make a precision application cable in the home workshop? What is this cable doing that another 3 foot 50 ohm terminated cable can't do? I'm a m addicted to collecting Tek 500 series plugins for my home lab and have a SG503 and would love to make one. Thanks and love your videos.
His reply:
w2aew
I looked up the engineering specs for that cable - doesn't look like anything super special. 012-0482-00 refers to a 36" +/-0.5" long RG-58C/U cable with BNC connectors and strain reliefs. The BNC connectors are to be per MIL-C-39012 spec, which basically applies to most high-quality (reputable manufacturer) connectors, rated to 4GHz, max insertion loss of 0.2dB at 3GHz, VSWR of 1.3:1 max with TFE insulation. Nothing super special, just a 3' 50ohm coax made with quality materials.
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Re: I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series
Nearly all of the Tektronix products from the 1960's were a marvel of
superb designs. I actually prefer the older scopes as long as high
bandwidth is not an issue. These old scopes are generally very reliable
and well-behaved. Many newer scopes are overly complex and almost
guarantee problems since the parts count has gone up so much.
Gary
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On Thu, Apr 25, 2019 at 12:39 PM Roy Morgan <k1lky68@...> wrote: John and others,
I have a 547 and a 545B that I plan to run for a long time. One of the
two late 1A1 plugins I have has low gain in one chancel. Not diagnosed
yet.
Have had other scopes of that era and earlier but only these reman now.
I am puzzling out how to use the 1A5 differential plugin: it is a marvel
of switching and design.
Roy
On Wed, 3/27/19, John Williams <books4you@...> wrote:
Subject: [TekScopes] I wonder if there is much interest in vacuum tube
oscilloscopes such as the 500 series
To: [email protected]
Date: Wednesday, March 27, 2019, 6:07 PM
Hi folks. I have been observing ...I am not seeing much on
older scopes ie before the 7000 series.
Roy Morgan
K1LKY since 1958
k1lky68@...
--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247
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Re: I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series
John and others, I have a 547 and a 545B that I plan to run for a long time. One of the two late 1A1 plugins I have has low gain in one chancel. Not diagnosed yet. Have had other scopes of that era and earlier but only these reman now. I am puzzling out how to use the 1A5 differential plugin: it is a marvel of switching and design. Roy
On Wed, 3/27/19, John Williams <books4you@...> wrote:
Subject: [TekScopes] I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series
To: [email protected]
Date: Wednesday, March 27, 2019, 6:07 PM
Hi folks. I have been observing ...I am not seeing much on
older scopes ie before the 7000 series.
Roy Morgan K1LKY since 1958 k1lky68@...
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Re: Tek485 - a quick question on disabling/bypassing power supply protection
In one of your earlier posts you said you had seen spiking behaviour on pin 3 of U1624. This will drive larger spikes from the output pin via Q1614 and C1602 into the protection circuitry and can very probably trigger the balance node of U1910 into fault mode. The manual states that in normal operation CR1958 is not conducting so if you have another scope available you can measure across CR1958 during the power up transient. It is not clear if you have done any tests with comb/pin U3 removed, and no -3kV cathode supply, since your first round of capacitor failures.
Again, if you have a scope, what do you see on the -5V rail during the power up?
The manual quotes 600mA current draw on the -5V line, the semiconductors and ICs will very probably draw different amounts of current when the other low voltage supplies are active so 333mA is not indicative of any problem.
Roger
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Re: Tek485 - a quick question on disabling/bypassing power supply protection
Took up Fred's suggestion and connected -5V to the power supply board. Didn't crank the supply up high - tried 0.2A and then 0.4A current limit. Max draw was 333mA with all combs in and P1560/1570 attached (I've already removed the vertical attenuators to take them out of the eqn). Removing Z comb dropped draw by 110mA. As the previous intermittent short/problem was definitely affected by the P comb, I focused on that, leaving Z-comb out. With Pin and Zout draw was 220mA and rock solid as I removed most of the combs (one at a time). The only combs that affected the current draw at all were P (of course) that dropped it to 3mA (just serving the power supply board) and comb C which dropped the draw to 150mA. Schematic 17 shows comb pin C5 supplying -5V to various parts of the horizontal amplifier board, including the cathode regulator. So I found only 70mA drain despite allowing up to 400, which is well clear of a direct short, but it's at least pointing in the same direction as my previous debug sessions and may be meaningful. I can't see that 70mA creating any great heating effect - but perhaps next step is to pour on some IPA and see if I get any hot spots. Don't have a thermal camera. Any thoughts on whether that's a bad idea? That board has some pretty tailored components and I'd prefer not to damage them. Thanks for the suggested approach, which I'd not tried before.
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Actually, nothing wrong with the touch panel, as far as I know it is working. It is a spare I acquired when I bought some other equipment. Thanks all for the help.
73 Bill
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Re: Tek 1480C waveform monitor FREE
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Re: Tek 1480C waveform monitor FREE
Thanks to all that replied on this subject. I've decided to make this Tek 1480C waveform monitor free to anyone in the chicagoland area.
The only testing I've done on it is to verify the current draw is below the fuse rating. So its safe to plug in the wall and switch on.
NielsenTelecom
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On Wed, Apr 24, 2019 at 10:30 AM, Albert Otten wrote:
In 11401 it was 614-0727-00/01 A9 Touch Panel Circuit Board Assembly (the IR
diodes and sensors are on that board) . I feel quite sure that's the same as
in my CSA803
614-0727-00 was only used in 11401 11402 used 614-0785-00. CSA803 used 614-0864-00. 11403A used 614-0850-00 which was only used in 11403A. Since this is a complete assy including the front panel maybe the only difference is the text on the panel i.e. type number. /H?kan
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Re: Tek485 - a quick question on disabling/bypassing power supply protection
Squeezed in a bit of time to check for shorts to ground on all the -5V points. There's no sign from my previous scope traces and multimeter probing that any of the other supplies are faulty. Long list of junctions/components tested (won't list them here unless someone thinks it useful to cross-check detail) but everything looks fine with no power applied. All but one of some 30 test points had resistance to ground between 358 Ohm and 28 MOhm - but no sign of shorts (except on the hybrid resistor network R1642, where pin 2 is tied to ground. One side of CR1627 was at 74Ohm, the other at 317k - that was the lowest reading encountered. P1570 connector pins 4&5 read 359Ohm (pretty sure P1570 goes to the vertical attenuators. P4 and Z2 comb connector points read the same. Also tested Q1614 & Q1618 on the cathode reg circuit on my Octopus tester - they seem to behave fine and match spares I have of both.
I recall checking lots of caps and diodes in the LV and HV power supply some months ago and finding all of them good - though I did earlier have to change out a faulty HV diode and suspect cap on the HV board. I'll follow up your other suggestions when I have time to delve back into it properly. Great scope when it works - bit of a challenge when it plays up! At least I know what not to do now.
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Hi Bill,
In 11401 it was 614-0727-00/01 A9 Touch Panel Circuit Board Assembly (the IR diodes and sensors are on that board) . I feel quite sure that's the same as in my CSA803. No guarantee for your 11403A of course.
Now I'm curious what's wrong with the touch panel?
Albert
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Re: CRT Hood for 7000 series 'scopes?
Thanks, Dennis! I will keep my eye open for one of those.
Sean
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On Tue, Apr 23, 2019 at 10:31 AM, Dennis Tillman W7PF wrote:
Hi Sean,
I stand corrected. Tek did make a simple viewing hood . The 016-0260-00 was a
simple 3 sided folding viewing hood for the 577, 5000 series, and the 7000
series. I'm looking at a picture of one on page 196 of the 1975 catalog. Like
the other viewing hood it is listed in the Accessories section of the Tek
catalogs under Viewing Accessories (oddly enough). Viewing Accessories and
Viewing Hood are both listed in the catalog's index so it should be easy to
find in every catalog up until 1990. There are several variations to fit other
scopes.
Dennis Tillman W7PF
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Re: Pacific Measurements or Wavetek 1038 System
Hello Walter,
I removed all pushbutton switches from the frontpanel board. I measured them and all are in an open state. I expected some to be stuck in the closed state, which would explain the not properly starting of the N10. Measuring the resistance of the switches when pussed show major variance in resistance value in the on-state. Seems enough to prevent proper switching.
Unfortunately the previous owner of the instrumen had taken apart 2 of the switches.
I hope to be able to control the instrument from the interfacebus whithout using the frontpanel switches.
Do you know if the instument can be set to remote mode using the interface only or is it required to switch to remote mode using the front keyboard?
I tested the instrument stand-alone, without a sweepgenerator attached to the sweep-input. Could that be the problem?
I am also looking for control software for this instrument (prefer HP-basic or HT-basic), so I don't have to start all-over to write a control program.
Hope we get some interresting discussions on this instrument in this group.
Regards,
Hans Boon
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Re: Pacific Measurements or Wavetek 1038 System
Good history of Wavetek here.
John
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On 4/23/2019 10:30 AM, nonIonizing EMF wrote: I was wondering also if Gigatronics had inherited Wavetek since I read somewhere else regarding I think with the signal generators in a thread.
I was also wondering if some of the line went to Wandel & Goltermann and then to Fluke per this EEVblog comment ( (1970-1990-era)-shenanigans/msg1264368/#msg1264368 ) that clearly shows a Tektronix mainframe with the 1038 system:
"Meet the Pacific Measurements (later gobbled up by Wavetek, later gobbled up by Wandel & Goltermann, later gobbled up by Fluke) 1038 system, in this case configured as a dual port network analyzer."
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If anyone here has the service manual for the 11403A digitizing scope, can you do me a favor and dig up the part number for the faceplate/circuit board that surrounds the display? Much appreciate the help. Thanks, Bill
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Re: Again a 7854 power supply beast to be repaired...
Welcome in the hell of 7854 SMPS repairing GeorgeP!
Your contribution is more than welcome!
Can you post some relevant images of the signal present at various test points of board A12 and A23 when in tick (burst) mode?
Max
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Jared Cabot
Gary Robert Bosworth
bill K7WXW
zenith5106