Date   

Re: Fixing a 7603 Power Supply

 

SUCCESS!

The 7603 "works" after a fashion. The reason that I don't see anything on screen is that the INTENSITY pot is very, very dirty and not making contact through most of its range of motion. If I rotate the knob rapidly back and forth I am able to get the CRT to show a trace in fits and flashes, enough that I can see that I'm getting signal and that the sweep is working.

When I went to unmount the pot from the panel, after I removed the knobs, I found that there was some kind of grease leaking around the outer shaft. The inner shaft also appears to have been straightened. This is a standard Bournes modular pot with three elements. My understanding is that these should be well sealed, and I do not expect to find grease leaking around the shafts, so I'm guessing a previous owner tried to recondition the pot. I might simply have to order a replacement.

-- Jeff Dutky


Re: Dennis Tillman

Jim Ford
 

I second that, Michael and Bob!  A friend called the local police about 15 years ago after receiving a bogus text that I was going to kill myself (long story; I  wasn't).  Cops were very helpful and understanding and we all appreciated my good friend's concern.      Dennis I'm sure will explain in due time.         Jim Ford in Southern California, USASent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: "Michael A. Terrell" <terrell.michael.a@gmail.com> Date: 7/11/21 3:29 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Dennis Tillman I'm 100% disabled, and I've had it happen several times with no problems.There is no reliable cell service where I live, so my phone service wasVOIP, which only worked when Spectrum was actually working.  You must havesome really shitty police where  you live.On Sun, Jul 11, 2021 at 3:27 PM redarlington <rdarlington@gmail.com> wrote:> No, don't do that.  That's a major vector for increasing their annual> number of citizens killed.  Sometimes it's just super annoying to the> person being checked, and sometimes the cops use their firearms because,> "RESPECT MAH AUTHORITAH".   Really, this is a very bad idea pretty much> ever.>> -Bob N3XKB>> On Sun, Jul 11, 2021 at 11:45 AM Michael A. Terrell <> terrell.michael.a@gmail.com> wrote:>> > You could call the local police, and request a wellness check.> >> >>>> >>>


Re: TM500 series - no SA

Vince Vielhaber
 

I guess that explains why the tekwiki page for the 1401 didn't mention the TM500. Those pics from the TM515 were from a unit I had. Back in the day I also had a 1L20 in a 545B.

Vince.

On 07/11/2021 08:58 PM, Jeff Kruth via groups.io wrote:
The 1401 was a standalone box that hooked to a scope. It was not a TM-500 module. Someone hacked one into a 500 frame according to the pics shown. I had several of these standalone 1401's in the 1980's when they were quite a "thing". Most SA's for hobbyist use were HUGE. Like a 1L20 in a 545. Or an HP 851-8551. (before the 141T stuff)Regards,Jeff Kruth In a message dated 7/11/2021 7:49:13 PM Eastern Standard Time, vev@michvhf.com writes:
The Tektronix 1401 was an SA that used the TM500 as was this item that
was an all in one that fit in a TM515:

https://w140.com/tekwiki/wiki/CCS_A-7

There's a link there to the 1401.

Vince.

On 07/11/2021 07:40 PM, EJP wrote:
I was musing on the very extensive TM500 series plugin and I noticed that everything I could think of and quite a few I couldn't think of was covered except a spectrum analyzer. I wonder if there is any history about this?

EJP




--
Michigan VHF Corporation -- nobucks dot net
K8ZW - http://www.hamradio.fun


Re: TM500 series - no SA

Jeff Kruth
 

The 1401 was a standalone box that hooked to a scope. It was not a TM-500 module. Someone hacked one into a 500 frame according to the pics shown. I had several of these standalone 1401's in the 1980's when they were quite a "thing". Most SA's for hobbyist use were HUGE. Like a 1L20 in a 545. Or an HP 851-8551. (before the 141T stuff)Regards,Jeff Kruth In a message dated 7/11/2021 7:49:13 PM Eastern Standard Time, vev@michvhf.com writes: 
The Tektronix 1401 was an SA that used the TM500 as was this item that
was an all in one that fit in a TM515:

https://w140.com/tekwiki/wiki/CCS_A-7

There's a link there to the 1401.

Vince.

On 07/11/2021 07:40 PM, EJP wrote:
I was musing on the very extensive TM500 series plugin and I noticed that everything I could think of and quite a few I couldn't think of was covered except a spectrum analyzer. I wonder if there is any history about this?

EJP




--
        Michigan VHF Corporation -- nobucks dot net
              K8ZW - http://www.hamradio.fun


Re: Calibrate the time base, or horizontal amplifier?

Harvey White
 

I'm not sure how well I can hear you, your voice is a bit echo-y from the bottom of that rabbit hole.

IMHO, what most people seem to worry about is horizontal and vertical accuracy, time and amplitude.  You're quite correct that checking out the frequency response is difficult.  The SG502 and SG503 are constant amplitude generators (at least the SG503 and SG504), and those can be used for frequency calibration.  There are workarounds for fast risetime squarewave generators, which can be built easily.  How much is a Fluke 5200?  Thought they needed an amplifier for the high voltage output on AC.  I personally can do DC 0-2 amps and 0-1KV.  AC is a problem.

I do wonder how many people will calibrate a scope to that extent, unless the scope simply won't work without those sources. (the DM5101 *needs* a 600 volt measured AC source, but it's not a scope).

Harvey

On 7/11/2021 6:26 PM, Zentronics42@gmail.com wrote:
Harvey,
One of the main calibration issues that requires "exotic" signals Is the frequency calibration of the amplifiers. Having these be off can nuke the bandwidth of the scope. 465B 3db down 75-80 Mhz instead of 135 Mhz. (Yes I know 135 is above the 100 Mhz rating of the scope but that is what mine caled up to when properly adjusted.) These are done with fast edge square waves. 1ns rise time for 465 and under, ps rise time for 485's and faster for even further up the BW scale. But in terms of an AC calibrator a fluke 5200A would not be bad with its amp 5205A can go to I"1500 Vac. Which is a bit spicey. If using a meter something that needs to be taken in to account most good meters work in AC RMS scopes work in PK-PK so appropriate calculations need to be taken in to account when setting up the signal source. In terms of calibration a functioning and calibrated TG501, PG506, and SG503 will cover 99% of the scopes up to 100 Mhz. Over that will need "exotic" signal sources tunnel diode pulsers and such. I will admit I have seen the bottom of that rabbit hole it is kind of on the deep side.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Harvey White
Sent: Sunday, July 11, 2021 6:14 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Calibrate the time base, or horizontal amplifier?

Not sure that they ever made one for the 5000 series, but an input standardizer would give you direct access to the frame, which would be fine if you had a known AC amplitude to calibrate the frame.

You'll only be able to get close, but remember that a scope is good to 3 to 5% anyway.

I'd be tempted to find an accurate AC source. A good meter would help, square waves would be best, but you'd need to adjust for the waveform if you're using a meter.

If you could feed a signal directly into the frame, then that allows you to calibrate both the H and V amplifiers.

If you have only the one frame, or only the one plugin, then I'd be tempted to take the mainframe's calibration on the Y channel as valid (arbitrary, I know), then adjust the vertical plugin to read the appropriate p-p value on the scope.

Then swap the H and V plugins (should be allowed, please check), but then adjust the H frame gain to the same deflection.

Then swap the plugins back to H and V. Adjust the H timebase for the appropriate scale.

that ought to get you close.

That's what I'd do. Adjusting the power supplies pretty much requires a recalibration.

A time mark generator can be made with some TTL logic and a TTL oscillator chip.

There are some amplitude calibrators used for a DMM that would give you at least a good 10 volt reference, so that range would be ok, but you'd find it difficult to check the other ranges.

Harvey


On 7/11/2021 5:28 PM, emissionlabs wrote:
Hello,

I need a little guidance, and don't want to make misakes while fixing a 5113 Dual Beam Scope. The 3400V high voltage was gone, and when I fixed that, the chopper circuit appeared bad, and when then was fixed, there was only one beam. Not mentioning a few smaller defects. But I have it all fixed now, and it works very good. Sharp traces, and very nice geometry.

I have adjusted the high voltage nicely at 3400V. +/-30V is as good as the single turn pot meter can do. +/-170V is allowed. Probably the HV is not exactly the same as it was before, and this affects the picture size, and if so, horizontal and vertical gain calibration needs to be done. I have two time base modules with it, which do not show the same result on the calibrator of the scope itself. So at least one of them is out of calibration. The horizontal trace is a tiny bit too slow, which can be caused by the horizontal amplifier being set wrong, or the time base being set wrong. I do not have a time mark generator, but I have an accurate hewlett packard pulse generator, which probably can do the same. And also we have 50 Hz here, and the internal calibrator shows exactly 100Hz. So a good reference is not the problem.

At this point I get stuck a little bit because I could set the horizontal gain a little bit higher, or set the time base a little bit faster. Both would "cure" the problem. But it feels wrong to set the time base faster, while in fact the horizontal amplifier would be out of calibration, or vice versa.

I have neve done this before, and I don't want to mess it up. It is such a crispy sharp CRT for the rest if it, I would like to get this scope in good condition. Perhaps someone has good advice for me. Thanks in advance!















Re: Dennis Tillman

redarlington
 

They're real nice here, but police are not equipped in any useful way to
check on the welfare of citizens, but that's who gets sent out. And it
ends badly sometimes. If they sent a medic or firefighter, there's a
whole lot smaller chance of them shooting somebody. But nobody seems to
think to do that. Anyway, I'm sick of the thousand citizens a year they
kill, but this is off topic and a moot point. Somebody on the list already
talked to Dennis and relayed back that things are ok.

-Bob

On Sun, Jul 11, 2021, 4:30 PM Michael A. Terrell <
terrell.michael.a@gmail.com> wrote:

I'm 100% disabled, and I've had it happen several times with no problems.
There is no reliable cell service where I live, so my phone service was
VOIP, which only worked when Spectrum was actually working. You must have
some really shitty police where you live.

On Sun, Jul 11, 2021 at 3:27 PM redarlington <rdarlington@gmail.com>
wrote:

No, don't do that. That's a major vector for increasing their annual
number of citizens killed. Sometimes it's just super annoying to the
person being checked, and sometimes the cops use their firearms because,
"RESPECT MAH AUTHORITAH". Really, this is a very bad idea pretty much
ever.

-Bob N3XKB

On Sun, Jul 11, 2021 at 11:45 AM Michael A. Terrell <
terrell.michael.a@gmail.com> wrote:

You could call the local police, and request a wellness check.










Re: TM500 series - no SA

Vince Vielhaber
 

The Tektronix 1401 was an SA that used the TM500 as was this item that was an all in one that fit in a TM515:

https://w140.com/tekwiki/wiki/CCS_A-7

There's a link there to the 1401.

Vince.

On 07/11/2021 07:40 PM, EJP wrote:
I was musing on the very extensive TM500 series plugin and I noticed that everything I could think of and quite a few I couldn't think of was covered except a spectrum analyzer. I wonder if there is any history about this?

EJP



--
Michigan VHF Corporation -- nobucks dot net
K8ZW - http://www.hamradio.fun


TM500 series - no SA

EJP
 

I was musing on the very extensive TM500 series plugin and I noticed that everything I could think of and quite a few I couldn't think of was covered except a spectrum analyzer. I wonder if there is any history about this?

EJP


Re: Members in Australia

EJP
 

Another Aussie here, Melbourne 3182 (St Kilda West). 7000 series and TM500 series.

Quite a den of us here in Melbourne.

Esmond Pitt.


Re: Dennis Tillman

Michael A. Terrell
 

I'm 100% disabled, and I've had it happen several times with no problems.
There is no reliable cell service where I live, so my phone service was
VOIP, which only worked when Spectrum was actually working. You must have
some really shitty police where you live.

On Sun, Jul 11, 2021 at 3:27 PM redarlington <rdarlington@gmail.com> wrote:

No, don't do that. That's a major vector for increasing their annual
number of citizens killed. Sometimes it's just super annoying to the
person being checked, and sometimes the cops use their firearms because,
"RESPECT MAH AUTHORITAH". Really, this is a very bad idea pretty much
ever.

-Bob N3XKB

On Sun, Jul 11, 2021 at 11:45 AM Michael A. Terrell <
terrell.michael.a@gmail.com> wrote:

You could call the local police, and request a wellness check.






Re: Calibrate the time base, or horizontal amplifier?

Zentronics42@...
 

Harvey,
One of the main calibration issues that requires "exotic" signals Is the frequency calibration of the amplifiers. Having these be off can nuke the bandwidth of the scope. 465B 3db down 75-80 Mhz instead of 135 Mhz. (Yes I know 135 is above the 100 Mhz rating of the scope but that is what mine caled up to when properly adjusted.) These are done with fast edge square waves. 1ns rise time for 465 and under, ps rise time for 485's and faster for even further up the BW scale. But in terms of an AC calibrator a fluke 5200A would not be bad with its amp 5205A can go to 1500 Vac. Which is a bit spicey. If using a meter something that needs to be taken in to account most good meters work in AC RMS scopes work in PK-PK so appropriate calculations need to be taken in to account when setting up the signal source. In terms of calibration a functioning and calibrated TG501, PG506, and SG503 will cover 99% of the scopes up to 100 Mhz. Over that will need "exotic" signal sources tunnel diode pulsers and such. I will admit I have seen the bottom of that rabbit hole it is kind of on the deep side.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Harvey White
Sent: Sunday, July 11, 2021 6:14 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Calibrate the time base, or horizontal amplifier?

Not sure that they ever made one for the 5000 series, but an input standardizer would give you direct access to the frame, which would be fine if you had a known AC amplitude to calibrate the frame.

You'll only be able to get close, but remember that a scope is good to 3 to 5% anyway.

I'd be tempted to find an accurate AC source. A good meter would help, square waves would be best, but you'd need to adjust for the waveform if you're using a meter.

If you could feed a signal directly into the frame, then that allows you to calibrate both the H and V amplifiers.

If you have only the one frame, or only the one plugin, then I'd be tempted to take the mainframe's calibration on the Y channel as valid (arbitrary, I know), then adjust the vertical plugin to read the appropriate p-p value on the scope.

Then swap the H and V plugins (should be allowed, please check), but then adjust the H frame gain to the same deflection.

Then swap the plugins back to H and V. Adjust the H timebase for the appropriate scale.

that ought to get you close.

That's what I'd do. Adjusting the power supplies pretty much requires a recalibration.

A time mark generator can be made with some TTL logic and a TTL oscillator chip.

There are some amplitude calibrators used for a DMM that would give you at least a good 10 volt reference, so that range would be ok, but you'd find it difficult to check the other ranges.

Harvey


On 7/11/2021 5:28 PM, emissionlabs wrote:
Hello,

I need a little guidance, and don't want to make misakes while fixing a 5113 Dual Beam Scope. The 3400V high voltage was gone, and when I fixed that, the chopper circuit appeared bad, and when then was fixed, there was only one beam. Not mentioning a few smaller defects. But I have it all fixed now, and it works very good. Sharp traces, and very nice geometry.

I have adjusted the high voltage nicely at 3400V. +/-30V is as good as the single turn pot meter can do. +/-170V is allowed. Probably the HV is not exactly the same as it was before, and this affects the picture size, and if so, horizontal and vertical gain calibration needs to be done. I have two time base modules with it, which do not show the same result on the calibrator of the scope itself. So at least one of them is out of calibration. The horizontal trace is a tiny bit too slow, which can be caused by the horizontal amplifier being set wrong, or the time base being set wrong. I do not have a time mark generator, but I have an accurate hewlett packard pulse generator, which probably can do the same. And also we have 50 Hz here, and the internal calibrator shows exactly 100Hz. So a good reference is not the problem.

At this point I get stuck a little bit because I could set the horizontal gain a little bit higher, or set the time base a little bit faster. Both would "cure" the problem. But it feels wrong to set the time base faster, while in fact the horizontal amplifier would be out of calibration, or vice versa.

I have neve done this before, and I don't want to mess it up. It is such a crispy sharp CRT for the rest if it, I would like to get this scope in good condition. Perhaps someone has good advice for me. Thanks in advance!







Re: Calibrate the time base, or horizontal amplifier?

Harvey White
 

Not sure that they ever made one for the 5000 series, but an input standardizer would give you direct access to the frame, which would be fine if you had a known AC amplitude to calibrate the frame.

You'll only be able to get close, but remember that a scope is good to 3 to 5% anyway.

I'd be tempted to find an accurate AC source.  A good meter would help, square waves would be best, but you'd need to adjust for the waveform if you're using a meter.

If you could feed a signal directly into the frame, then  that allows you to calibrate both the H and V amplifiers.

If you have only the one frame, or only the one plugin, then I'd be tempted to take the mainframe's calibration on the Y channel as valid (arbitrary, I know), then adjust the vertical plugin to read the appropriate p-p value on the scope.

Then swap the H and V plugins (should be allowed, please check), but then adjust the H frame gain to the same deflection.

Then swap the plugins back to H and V.  Adjust the H timebase for the appropriate scale.

that ought to get you close.

That's what I'd do.  Adjusting the power supplies pretty much requires a recalibration.

A time mark generator can be made with some TTL logic and a TTL oscillator chip.

There are some amplitude calibrators used for a DMM that would give you at least a good 10 volt reference, so that range would be ok, but you'd find it difficult to check the other ranges.

Harvey

On 7/11/2021 5:28 PM, emissionlabs wrote:
Hello,

I need a little guidance, and don't want to make misakes while fixing a 5113 Dual Beam Scope. The 3400V high voltage was gone, and when I fixed that, the chopper circuit appeared bad, and when then was fixed, there was only one beam. Not mentioning a few smaller defects. But I have it all fixed now, and it works very good. Sharp traces, and very nice geometry.

I have adjusted the high voltage nicely at 3400V. +/-30V is as good as the single turn pot meter can do. +/-170V is allowed. Probably the HV is not exactly the same as it was before, and this affects the picture size, and if so, horizontal and vertical gain calibration needs to be done. I have two time base modules with it, which do not show the same result on the calibrator of the scope itself. So at least one of them is out of calibration. The horizontal trace is a tiny bit too slow, which can be caused by the horizontal amplifier being set wrong, or the time base being set wrong. I do not have a time mark generator, but I have an accurate hewlett packard pulse generator, which probably can do the same. And also we have 50 Hz here, and the internal calibrator shows exactly 100Hz. So a good reference is not the problem.

At this point I get stuck a little bit because I could set the horizontal gain a little bit higher, or set the time base a little bit faster. Both would "cure" the problem. But it feels wrong to set the time base faster, while in fact the horizontal amplifier would be out of calibration, or vice versa.

I have neve done this before, and I don't want to mess it up. It is such a crispy sharp CRT for the rest if it, I would like to get this scope in good condition. Perhaps someone has good advice for me. Thanks in advance!





Re: Calibrate the time base, or horizontal amplifier?

Zentronics42@...
 

No need to tweak the pots!! If you just repaired the HV supply this would only effect brightness in the scope it should not really mess with the time base at all or vert amp at all. Now this goes with out saying that adjusting the reference in the power supply with cause the need for a FULL recalibration / adjustment of the scope. This can be a very deep rabbit hole. I have made a few videos on You Tube about this topic. Mainly the 7000 scopes. I am currently working on a 400 series. I can post a link if there is any interest. Remember on a 400 series spec is 3%. Not sure what it is on a 5000 but it might still be "in spec"

The type 184 time base crystal is not the most accurate thing on the planet. The type 184 or TG501 would be around the time frame for a 5000 series scope. I have only seen one of the older time base unit ever. So they are even more rare. However The reference crystal in the time base 184 has about a 50 Hz swing on 10 Mhz. +25 to -25 Hz. This is mainly caused by the ovenized crystal heating and cooling as the oven is cycling. (REALLY annoying to adjust.) The tg501 is not near as bad to adjust.

If I can be of help let me know.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of redarlington
Sent: Sunday, July 11, 2021 5:49 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Calibrate the time base, or horizontal amplifier?

You'll need a time mark generator like a Tek 2901. But be very careful with this. At the last second before adjusting the time base, you may
start to wonder how accurate the oscillator in the generator is. Then you
might fall down that slippery slope of time nuttery. It's a curse or a
blessing depending on your personality. Sometimes it's both.

-Bob N3XKB

On Sun, Jul 11, 2021, 3:29 PM emissionlabs <jac@406777.de> wrote:

Hello,

I need a little guidance, and don't want to make misakes while fixing
a
5113 Dual Beam Scope. The 3400V high voltage was gone, and when I
fixed that, the chopper circuit appeared bad, and when then was
fixed, there was only one beam. Not mentioning a few smaller defects. But I have it all
fixed now, and it works very good. Sharp traces, and very nice geometry.

I have adjusted the high voltage nicely at 3400V. +/-30V is as good
as the single turn pot meter can do. +/-170V is allowed. Probably
the HV is not exactly the same as it was before, and this affects the picture size,
and if so, horizontal and vertical gain calibration needs to be done. I
have two time base modules with it, which do not show the same result on
the calibrator of the scope itself. So at least one of them is out of
calibration. The horizontal trace is a tiny bit too slow, which can
be caused by the horizontal amplifier being set wrong, or the time base being
set wrong. I do not have a time mark generator, but I have an accurate
hewlett packard pulse generator, which probably can do the same. And
also we have 50 Hz here, and the internal calibrator shows exactly 100Hz.
So a good reference is not the problem.

At this point I get stuck a little bit because I could set the
horizontal gain a little bit higher, or set the time base a little bit faster. Both
would "cure" the problem. But it feels wrong to set the time base
faster, while in fact the horizontal amplifier would be out of
calibration, or vice versa.

I have neve done this before, and I don't want to mess it up. It is
such a crispy sharp CRT for the rest if it, I would like to get this scope in
good condition. Perhaps someone has good advice for me. Thanks in
advance!







Re: Calibrate the time base, or horizontal amplifier?

redarlington
 

You'll need a time mark generator like a Tek 2901. But be very careful
with this. At the last second before adjusting the time base, you may
start to wonder how accurate the oscillator in the generator is. Then you
might fall down that slippery slope of time nuttery. It's a curse or a
blessing depending on your personality. Sometimes it's both.

-Bob N3XKB

On Sun, Jul 11, 2021, 3:29 PM emissionlabs <jac@406777.de> wrote:

Hello,

I need a little guidance, and don't want to make misakes while fixing a
5113 Dual Beam Scope. The 3400V high voltage was gone, and when I fixed
that, the chopper circuit appeared bad, and when then was fixed, there
was only one beam. Not mentioning a few smaller defects. But I have it all
fixed now, and it works very good. Sharp traces, and very nice geometry.

I have adjusted the high voltage nicely at 3400V. +/-30V is as good as
the single turn pot meter can do. +/-170V is allowed. Probably the HV is
not exactly the same as it was before, and this affects the picture size,
and if so, horizontal and vertical gain calibration needs to be done. I
have two time base modules with it, which do not show the same result on
the calibrator of the scope itself. So at least one of them is out of
calibration. The horizontal trace is a tiny bit too slow, which can be
caused by the horizontal amplifier being set wrong, or the time base being
set wrong. I do not have a time mark generator, but I have an accurate
hewlett packard pulse generator, which probably can do the same. And
also we have 50 Hz here, and the internal calibrator shows exactly 100Hz.
So a good reference is not the problem.

At this point I get stuck a little bit because I could set the horizontal
gain a little bit higher, or set the time base a little bit faster. Both
would "cure" the problem. But it feels wrong to set the time base
faster, while in fact the horizontal amplifier would be out of
calibration, or vice versa.

I have neve done this before, and I don't want to mess it up. It is such
a crispy sharp CRT for the rest if it, I would like to get this scope in
good condition. Perhaps someone has good advice for me. Thanks in
advance!







Calibrate the time base, or horizontal amplifier?

emissionlabs
 

Hello,

I need a little guidance, and don't want to make misakes while fixing a 5113 Dual Beam Scope. The 3400V high voltage was gone, and when I fixed that, the chopper circuit appeared bad, and when then was fixed, there was only one beam. Not mentioning a few smaller defects. But I have it all fixed now, and it works very good. Sharp traces, and very nice geometry.

I have adjusted the high voltage nicely at 3400V. +/-30V is as good as the single turn pot meter can do. +/-170V is allowed. Probably the HV is not exactly the same as it was before, and this affects the picture size, and if so, horizontal and vertical gain calibration needs to be done. I have two time base modules with it, which do not show the same result on the calibrator of the scope itself. So at least one of them is out of calibration. The horizontal trace is a tiny bit too slow, which can be caused by the horizontal amplifier being set wrong, or the time base being set wrong. I do not have a time mark generator, but I have an accurate hewlett packard pulse generator, which probably can do the same. And also we have 50 Hz here, and the internal calibrator shows exactly 100Hz. So a good reference is not the problem.

At this point I get stuck a little bit because I could set the horizontal gain a little bit higher, or set the time base a little bit faster. Both would "cure" the problem. But it feels wrong to set the time base faster, while in fact the horizontal amplifier would be out of calibration, or vice versa.

I have neve done this before, and I don't want to mess it up. It is such a crispy sharp CRT for the rest if it, I would like to get this scope in good condition. Perhaps someone has good advice for me. Thanks in advance!


Re: TDS5054B all LEDs lit, blank screen

David Kuhn
 

" It does look like a nice scope, if you like the fly-by-wire instruments."

It's not as easy to operate as a Siglent or Tektronix TDS3000 series. It
does have a very nice display. Even though it's Windows 2000, I've been
able to get it to see my network server so that screenshots can be saved to
a share folder to be used in a word document on my computer. It is very
fast operation, 500MHz, 5GS/S. If it was a little more intuitive, I may
have had it certified to use with calibrations I do and worked it into some
of my utility software. Right now, it impresses the heck of people seeing
it on the repair bench running. For what I use it for on the repair bench,
a cheap Siglent would work - lol. I do want to work it into my utility
software sometime. With fast 400volt pulses, it matches my TDS3054 almost
exactly voltage, Rise Time and Pulse Width. Some scope can not even match
themselves between channels.

I don't think Tek's OpenChoise software works with it for screen shots and
setup uploads. I don't know that Tek has a utility for it. If you are
looking for a more easily usable/capable scope, I can highly recommend the
TDS3000 series. I prefer the Pre-C versions of them. The TDS3000 s are so
easy just to twist knobs and use. Openchoice works well with them and they
are easy to control and get data from using VISA commands via GPIB or
NETWORK interface. The TDS5054B just has that cool factor and can make you
feel smart when you finally figure out how to tell it you are using a 100:1
probe (LOL) or just when you use it for that matter - heh heh.

I forget what I paid for them (Okay I found out $900 for one with four
brand new P5050 Scope Probes, and $540 for one with four used scope
probes). Both worked fine when I got them, but they are huge for a digital
scope.

So in summary: The cool factor is off the scale -lol, Ease of Use, below
average

On Sat, Jul 10, 2021 at 5:31 PM Jeff Dutky <jeff.dutky@gmail.com> wrote:

David,

For almost $1000 (including shipping) there are units that are much more
obviously functional on the auction site. I'm not sure why you would buy
this unit at that price.

It does look like a nice scope, if you like the fly-by-wire instruments.

-- Jeff Dutky






Re: Dennis Tillman

redarlington
 

No, don't do that. That's a major vector for increasing their annual
number of citizens killed. Sometimes it's just super annoying to the
person being checked, and sometimes the cops use their firearms because,
"RESPECT MAH AUTHORITAH". Really, this is a very bad idea pretty much
ever.

-Bob N3XKB

On Sun, Jul 11, 2021 at 11:45 AM Michael A. Terrell <
terrell.michael.a@gmail.com> wrote:

You could call the local police, and request a wellness check.


Re: Dennis Tillman

pdxareaid
 

good point.
i'm glad dennis is doing ok...here are some recent anecdotes to lighten the thread:

years ago i was communicating with someone 3000 miles away and he sent me an email that just stopped mid sentence. i replied and got no answer.
he was advanced in years (a common condition here) and i had visions of him having an attack while composing and hitting "send" as a cry for help. i only knew him virtually so i had to hunt down the details and called the police for a wellness check. they were not very helpful in florida and were taking their time. i eventually got a reply from him (he accidentally hit "send" prematurely) hours later so i called police and called off wellness check.
it is an option to keep in mind though.

another: a neighbor called the police for a wellness check on me when i did not put out my garbage a day earlier. another neighbor saw cops looking in windows and
told them i was unreachable at the coast for a few days. i have the calling neighbor on my whereabouts update list now :-)
he did have some reason to be concerned, however. just previously i confronted a burglar and knives and gunfire ensued. he is currently in prison. so much for lightening it up. :-(


Re: Tek 531A overhaul

Mark Vincent
 

Nicolas,

Yes, you will need to unsolder the leads of the parts. Only one end is necessary while bending the part up. That way you can easily tell where it goes back. The hardware to remove the cans will be easily reached. If you want to replace any of the resistors while one end is up, that is up to you.

Mark


Re: Dennis Tillman

Michael A. Terrell
 

You could call the local police, and request a wellness check.

On Sat, Jul 10, 2021 at 3:33 PM pdxareaid via groups.io <mousterious=
yahoo.com@groups.io> wrote:

a google search for him in bellevue will yield lots of info including his
call sign, home address, landline, email adr etc. even neighbors and
relatives.
the nuber link had lots of info for free. i don't know him (and he had
email problems in the past) so if someone can use this info to check on
him, please do.






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