Date   

Re: Type 184

Stephen
 

On Fri, Jul 31, 2020 at 04:43 AM, n4buq wrote:


Is your Hameg counter in calibration and, if so, for what accuracy is is
spec'd?

Thanks,
Barry - N4BUQ
It should be, yes.

Translated from the manual:
Time lapse between 2 measures: >= 0.3s
Precision? +/- CMS +/- trigger error/N to the 3rd, + Time Base Error x Period.


Re: Type 184

Tom Gardner
 

On 31/07/20 17:05, Stephen wrote:
On Fri, Jul 31, 2020 at 04:40 AM, Tom Gardner wrote:

There are two possible answers:

* is it with the published specification?
* does it do what you need it to do?>
Yes and yes.
In that case the question becomes "what have I got to gain by fiddling with it?". That can be balanced against what you might have to lose. The balance seems easy :)

That presumes all the outputs work as expected, but that is very different to the frequency accuracy.


Re: Type 184

Stephen
 

On Fri, Jul 31, 2020 at 04:40 AM, Tom Gardner wrote:

There are two possible answers:

* is it with the published specification?
* does it do what you need it to do?>
Yes and yes.


Re: Type 184

Ken Eckert
 

From the manual:

2. Check Crystal Oscillator Frequency
a. Requirement-Frequency 1 0 MHz ± 1 00 Hz at ambient
room temperature. Crystal oven stabil ized. (Two hours
warm-up time after power is appl ied before crystal oven is
stabilized.)

On Fri, Jul 31, 2020 at 8:41 AM Tom Gardner <tggzzz@...> wrote:

On 31/07/20 16:26, Stephen wrote:
I have this Type 184 that I acquired a few months back from EBay.
After cleaning all the contacts and switches, it works fine. However,
the last calibration stickers dates from 1982. So I assume it hasn’t been
calibrated since.
Yesterday I checked the 10Mhz base frequency and found this:

https://groups.io/g/TekScopes/photo/251419/0?p=Created,,,20,2,0,0

Is it acceptable? It oscillates between 10000.024 to 10000.030 kHz
There are two possible answers:

* is it with the published specification?
* does it do what you need it to do?


I don’t feel confident nor confortable touching it. Would you?
Yes I would, but I'm not you.

I have been /very careful/ not to physically touch some of the internal
metalwork when plugged in, and only to bend some of the exposed wires
after it
has been /unplugged/ for at least a minute.

My attitude? If you are happy with it, then touching it can only make you
less
happy with it.




Re: Type 184

Mlynch001
 

On Fri, Jul 31, 2020 at 10:26 AM, Stephen wrote:


s it acceptable? It oscillates between 10000.024 to 10000.030 kHz

I don’t feel confident nor confortable touching it. Would you?
In my opinion, Your counter could just as easily have an error and be reading slightly high. Without a verifiable standard to compare either instrument with, it is impossible to determine, I would leave it as is until you can find a reliable standard source.


--
Michael Lynch
Dardanelle, AR


Re: Type 184

n4buq
 

Is your Hameg counter in calibration and, if so, for what accuracy is is spec'd?

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Stephen" <stephen.nabet@...>
To: TekScopes@groups.io
Sent: Friday, July 31, 2020 10:26:01 AM
Subject: [TekScopes] Type 184

I have this Type 184 that I acquired a few months back from EBay.
After cleaning all the contacts and switches, it works fine. However, the
last calibration stickers dates from 1982. So I assume it hasn’t been
calibrated since.
Yesterday I checked the 10Mhz base frequency and found this:

https://groups.io/g/TekScopes/photo/251419/0?p=Created,,,20,2,0,0

Is it acceptable? It oscillates between 10000.024 to 10000.030 kHz

I don’t feel confident nor confortable touching it. Would you?




Re: Type 184

Tom Gardner
 

On 31/07/20 16:26, Stephen wrote:
I have this Type 184 that I acquired a few months back from EBay.
After cleaning all the contacts and switches, it works fine. However, the last calibration stickers dates from 1982. So I assume it hasn’t been calibrated since.
Yesterday I checked the 10Mhz base frequency and found this:

https://groups.io/g/TekScopes/photo/251419/0?p=Created,,,20,2,0,0

Is it acceptable? It oscillates between 10000.024 to 10000.030 kHz
There are two possible answers:

* is it with the published specification?
* does it do what you need it to do?


I don’t feel confident nor confortable touching it. Would you?
Yes I would, but I'm not you.

I have been /very careful/ not to physically touch some of the internal metalwork when plugged in, and only to bend some of the exposed wires after it has been /unplugged/ for at least a minute.

My attitude? If you are happy with it, then touching it can only make you less happy with it.


Type 184

Stephen
 

I have this Type 184 that I acquired a few months back from EBay.
After cleaning all the contacts and switches, it works fine. However, the last calibration stickers dates from 1982. So I assume it hasn’t been calibrated since.
Yesterday I checked the 10Mhz base frequency and found this:

https://groups.io/g/TekScopes/photo/251419/0?p=Created,,,20,2,0,0

Is it acceptable? It oscillates between 10000.024 to 10000.030 kHz

I don’t feel confident nor confortable touching it. Would you?


Photo 4DA70E16-CDEF-42C2-8220-679BCBA02FCA.jpeg uploaded #photo-notice

TekScopes@groups.io Notification <TekScopes@...>
 

The following photos have been uploaded to the Type 184 Base Frequency album of the TekScopes@groups.io group.

By: Stephen


Re: Stuck switches on 453

Abc Xyz
 

Richard,

I know a guy who told me he immerses Stuck Potentiometers/Switches in
Solution to free them up. I personally have not Witnessed the
Procedure...so take it for what its worth.
Also, I have Read where one Drills a Very Small Hole in the Body of the
Mechanism and Dribbles Solution in...again, I have never tried it or seen
it done.
I have tried turning the Scope where the Potentiometer Shaft is Vertical
and place a Few Drops of Deoxit on the Shaft itself thinking Gravity would
pull the Cleaner down into the Part...didn't work for me but it may be one
of those things where a Great Deal More Patience is Needed!

JR

On Thu, Jul 30, 2020, 10:46 PM Richard P via groups.io <wb5nen=
yahoo.com@groups.io> wrote:

I’ve used my Model 453 for years for basic audio but it has always had a
problem. The rotary switches on each of the variable sweep rate
potentiometers (one on the front panel, and one on the side) are frozen in
the uncalibrated positions. Therefore, the “Uncal A or B” light is forever
lit, and the sweep rate for either A or B is uncalibrated. These combined
switch/potentiometers are like a rotary volume control with an on/off
switch. But stuck. I’ve tried to loosen them up with DeOxit, contact
cleaner, even liquid wrench. But these guys are pretty-well sealed up, and
access to them in the 453 chassis is very challenging. I can see the shafts
moving a bit, so I believe the problem is inside the switch/pot assemblies,
not that shafts are stuck in bushings. Any thoughts on this one?

Richard




Re: Tektronix 2230

Saroj Pradhan
 

Hi
Satbeginner

Hope, every thing is fine with you.
I am ready with isolation transformer.
I had to build myself one. It was a tedious task, Because I do not have
proper winding machine. I will take the measurement tomorrow.
By the way, now the oscilloscope can be put on for more than 20 minutes. I
did not try for more than 20 minutes. What I noticed is the poor terminal
contact of C907. My question is :What happens if C907 terminal is open?
Right now, I have put irf830 for q9070 and ug2d(25ns recovery time)
Ug2d does not meet the specification for voltage requirement. Ug2d is rated
for 200v.
I am in much more difficult situation to acquire proper replacement part.
All option I have is either salvage the
component from old board or look in the local market. If I am lucky I can
find
some component in local market.
One thing more I have chacked the temperature at heatsink of q9070. In 20
minutes time it reached upto 70 degree Celsius.
Thanks
Saroj





On Fri, Jul 17, 2020, 10:28 AM Saroj Pradhan via groups.io
<sarojman.Pradhan=gmail.com@groups.io> wrote:

Hi Satbeginner
Right now I am looking for the transformer. I will get back when I find
one.
Thanks
Saroj

On Fri, Jul 17, 2020, 10:05 AM Saroj Pradhan via groups.io
<sarojman.Pradhan=gmail.com@groups.io> wrote:

Hi
Yes the transformer is not isolated its a tapped primary.
I need to find another one.
Thanks Harvey






Tektronix Calibration Fixture 067 0052 00

godleyfisher@...
 

UK based.
Tektronix Calibration Fixture 067 0052 00 Step Up Transformer dated 1967. Genuinely ‘untested’
Spares or Repair. Any value?
Collection only - it weighs a tonne!


Stuck switches on 453

Richard P
 

I’ve used my Model 453 for years for basic audio but it has always had a problem. The rotary switches on each of the variable sweep rate potentiometers (one on the front panel, and one on the side) are frozen in the uncalibrated positions. Therefore, the “Uncal A or B” light is forever lit, and the sweep rate for either A or B is uncalibrated. These combined switch/potentiometers are like a rotary volume control with an on/off switch. But stuck. I’ve tried to loosen them up with DeOxit, contact cleaner, even liquid wrench. But these guys are pretty-well sealed up, and access to them in the 453 chassis is very challenging. I can see the shafts moving a bit, so I believe the problem is inside the switch/pot assemblies, not that shafts are stuck in bushings. Any thoughts on this one?

Richard


Re: 4-pin plug on end of PD keyboard cable for 4041

J Mcvein
 

I have here a tek cable assy p/n 012-0450-00 with 2 Lemo connectors.
The plug OD is 9mm, there are 4 pins 2-M/2-F with a half-round
insulator for the male pin side. The Lemo catalog was available online
somewhere, one of the US distys maybe.. I always figured this cable
went to a power supply or something as the plug is a larger style
of the ones used on the FET probe. -J-

-----Original Message-----
From: "Gary Robert Bosworth" <@grbosworth>
Sent: Thursday, July 30, 2020 11:58pm
To: TekScopes@groups.io
Subject: [TekScopes] 4-pin plug on end of PD keyboard cable for 4041



Does anyone know the name of the manufacturer and part number for the 4-pin small round connector used on the end of the cord for the PD keyboard which plugs into the front of the 4041 GPIB Controller? The part is listed as P5003 and there is a very good schematic of the wiring, but no mention is made as to who made it or the manufacturer's part number. It looks like a miniature LEMO connector with a half shell inside to insure it is inserted correctly.


Re: Just got a 475, nothing showing on display

donald collie
 

Don`t keep us in suspence Jake, how are you going with your 475? [I have
one of these too]
Cheers!...................................................................Donald

On Fri, Jul 31, 2020 at 11:53 AM Steph L <stephlan@...> wrote:

Crt filament not open?




4-pin plug on end of PD keyboard cable for 4041

Gary Robert Bosworth
 

Does anyone know the name of the manufacturer and part number for the 4-pin small round connector used on the end of the cord for the PD keyboard which plugs into the front of the 4041 GPIB Controller? The part is listed as P5003 and there is a very good schematic of the wiring, but no mention is made as to who made it or the manufacturer's part number. It looks like a miniature LEMO connector with a half shell inside to insure it is inserted correctly.


The Tektronix Function Generator Teardown

Bill Perkins
 

Some might find this useful:

https://www.electronicdesign.com/technologies/test-measurement/article/21137778/the-tektronix-function-generator-teardown

I have three TM506s and three TM503s, all of which are long in tooth by now, so, along with the recent lengthy threads, I found the write up useful.



Bill


Configuration numbers

Dave Seiter
 

I just picked up a lot containing a 7A19 with a Tek Configuration tag.  The config number is WP2221/62, and it has it's own serial number.  I seem to recall that these were part of a "system" as opposed to modified plugin- is my memory correct?  
-Dave


DC505A weirdness

Dave Seiter
 

A while back, I picked up a DC505A cheap, and after a quick check that revealed no counting behavior, I consigned it to the projects pile.  Yesterday I pulled it out again to have another go and no joy, but then I accidentally knocked my 10MHz signal source off the bench and caught the counter display change.  After 45 minutes of really random behavior, I discovered that the center leads of both inputs were not soldered- they were just perfectly aligned to look like they were properly attached.  Also, both level pots had been rotated about 80º CCW. I can understand someone working on it and forgetting to resolder the leads, but why rotate both pots the same way?  The unit actually works well except for one dead segment of the LSD.  And the broken front plastic panel, of course- I've been playing with printing a new one, but it's challenging...
-Dave


Re: Just got a 475, nothing showing on display

Steph L
 

Crt filament not open?