What did you buy today? Post your latest purchase!

[TopLoser]

Well I can't find it in the catalogue but UPS delivered this to me today, shipping label says it came from Farnell..

[nanofrog]

Well I can't find it in the catalogue but UPS delivered this to me today, shipping label says it came from Farnell..

Nice.  For some reason, I've got it in my head it's likely an appreciation gift from the sales dept. for doing lots of business with them. 

[Cubdriver]

Well I can't find it in the catalogue but UPS delivered this to me today, shipping label says it came from Farnell..

Wow - that's either a tiny bottle, or a HUGE Lichtenberg figure.  Sweet!  (the captured lightning, I mean - the vodka I could take or leave)

-Pat

[TopLoser]

Well I can't find it in the catalogue but UPS delivered this to me today, shipping label says it came from Farnell..

Wow - that's either a tiny bottle, or a HUGE Lichtenberg figure.  Sweet!  (the captured lightning, I mean - the vodka I could take or leave)

-Pat

Yes a HUGE Lichtenberg figure, I've had it for 25+ years and not seen another one for sale as big.

Another picture of it here:
https://www.eevblog.com/forum/blog/553-lichtenberg-figures/

[Cubdriver]

Yes a HUGE Lichtenberg figure, I've had it for 25+ years and not seen another one for sale as big.

Another picture of it here:
https://www.eevblog.com/forum/blog/553-lichtenberg-figures/

Beautiful.  It certainly dwarfs the few that I have.

-Pat

[SteveyG]

A Fluke 28 ii EX

[deadlylover]

Here's a mini teardown of the Takeda Riken TR6110B DC Voltage Standard, they're known as Advantest now.

I don't know if they made any other dedicated DC standards, this might have been their only one apart from their general purpose DC sources/SMU's.

So it's only fitting then for the unit to be calibrated by its much younger sister (Advantest's best multimeter, the R6581), ahh it brings a tear to the eye....

[McBryce]

Well I can't find it in the catalogue but UPS delivered this to me today, shipping label says it came from Farnell..

They've sent it to the wrong address, can you forward it to me?

McBryce.

[Addicted2AnalogTek]

Tektronix 067-0532-01
Tektronix 2901 Time mark gen
Various Tek attenuators and terminations
(Arrived)

Tektronix 454A Scope
Tektronix 067-0625-00 Peak to Peak detector (ended up buying two...)
Huge Mouser order of parts for Tek 485, 468, 184, 106, 067-0532-00, 2901, & Wavetek 166
(Waiting)

[tautech]

Tektronix 2901 Time mark gen
(Arrived)

Huge Mouser order of parts for Tek 485, 468, 184, 106, 067-0532-00, 2901, & Wavetek 166
(Waiting)

Nice. 

Repair thread coming?
Teardown?

[Vgkid]

Here's a mini teardown of the Takeda Riken TR6110B DC Voltage Standard, they're known as Advantest now.

I don't know if they made any other dedicated DC standards, this might have been their only one apart from their general purpose DC sources/SMU's.

So it's only fitting then for the unit to be calibrated by its much younger sister (Advantest's best multimeter, the R6581), ahh it brings a tear to the eye....

thanks for the teardown, loving those precision wirewound resistors. Looks like a HP 735a.

[deadlylover]

thanks for the teardown, loving those precision wirewound resistors. Looks like a HP 735a.

Wow very interesting, it looks like a functional copy! Thanks for the tip. ^^

The 1mV control pot is damaged on mine, it doesn't seem to work at all except give a 1mV jump all at once, I think I should bypass it incase it is affecting stability. On first impressions it looks like it has a tempco of about 2ppm, on cold it reads 50 ppm low and it warms up in a couple of hours. It's short term stability is about 0.1ppm, though thermal emfs are a real pain for a 1V reference.

The temperature on the outer shell of the oven was about 40C.

I think just a simple LM399 surpasses it, let alone a LTZ1000. I have no use for a 1V reference and I much prefer a 10V one, I wonder if I can fit a 10V reference inside and substitute the 1.019V setting for it...

[HighVoltage]

Here's a mini teardown of the Takeda Riken TR6110B DC Voltage Standard, they're known as Advantest now.

I don't know if they made any other dedicated DC standards, this might have been their only one apart from their general purpose DC sources/SMU's.

So it's only fitting then for the unit to be calibrated by its much younger sister (Advantest's best multimeter, the R6581), ahh it brings a tear to the eye....

I had no idea that such a DC standard existed from them.
Very interesting.
Where did you buy it and how much was it?

[deadlylover]

I had no idea that such a DC standard existed from them.
Very interesting.
Where did you buy it and how much was it?

It was on Yahoo Auctions (basically Japanese eBay), and I paid JPY3100 or about USD26 or so.

Even if it didn't work at all, I *really* wanted to see inside it and I figure I could at least salvage the case or resistors for other projects. Those binding posts are still silky smooth to operate, I like it very much.

Literally the only info I have on it is that it is "2 ppm". I don't know what timeframe that is, probably 90 days? 

[HighVoltage]

It is a very impressive DC standard and the price you paid is unbelievable.
How much did you pay for your 8 1/2 digit Advantest multimeter, if I may ask.
Advantest makes some real nice gear.

[deadlylover]

It is a very impressive DC standard and the price you paid is unbelievable.
How much did you pay for your 8 1/2 digit Advantest multimeter, if I may ask.
Advantest makes some real nice gear.

Thanks! 

They really do make great gear, especially for hobbyists because you can get some fantastic deals as they don't carry the name of Tektronix or HP/Agilent.

The R6581 cost a measly JPY50k or about USD420, no joke.

So basically the R6581 was Advantest's answer to the HP3458A, it also has 2 source artifact calibration and auto calibration. More importantly, the R6581 actually stores the auto cal constants in battery backed up memory, and I bet you can guess why it was sold for so cheap after 17 years of use. The meter was autoranging like a madman and it refused to show a reading because it lost its auto cal constants.

$10 later for a replacement battery and I'm still smiling...  Maybe it is the deal of the century for volt-nuts.

[HighVoltage]

It seems like you know to get Advantest equipment for a really low cost.
I have never seen the R6581 for under $ 3000

So, you probably got the R6161 really cheap as well.

[TerraHertz]

Tektronix 067-0532-01

Interesting thing. Looks in very good condition.
The http://w140.com/tekwiki/wiki/067-0532-00  (also the -01) page hasn't had any photos posted yet. Hint hint.

[MrSlack]

Cheapest 13.8v PSU I could find:

http://www.rapidonline.com/Electrical-Power/Voltcraft-FSP-1132-Fixed-Voltage-Power-Supply-51-7496

Just want the case, transformer, meter, switches and binding posts. Going to eviscerate it and stick an LM1084 regulator in rather than the supplied gubbins so I have a drill speed controller for my PCB drill that doubles as another variable power supply, just in case I run out of them (already have 2)

[Addicted2AnalogTek]

Tektronix 2901 Time mark gen
(Arrived)

Huge Mouser order of parts for Tek 485, 468, 184, 106, 067-0532-00, 2901, & Wavetek 166
(Waiting)

Nice. 

Repair thread coming?
Teardown?

Sorry for the late reply, I keep getting a "502 bad gateway" error when I try to get onto the current page of this thread.  There seem to be a few tricks to getting around it, though.... such as clicking directly on the page number from the "replies to your posts" page.


Is there really no teardown of a 2901 on the forum already?!   huh...
Well then, yeah, I sure will!!    All that I've done thus far is cleaned the case & face up a bit and poke around inside + test it out. Bad switch, few out of tolerance resistors in the 3.6V power supply rail, faulty 2ns circuit.... (the diode is good, THANK GOD!)  so I suppose a teardown/repair is in order!

[Addicted2AnalogTek]

Tektronix 067-0532-01

Interesting thing. Looks in very good condition.
The http://w140.com/tekwiki/wiki/067-0532-00  (also the -01) page hasn't had any photos posted yet. Hint hint.

I'll be making a nice list of things to do, and that will certainly be one of them. Both the 067-0532-00 and 067-0532-01 TekWiki pages will soon have photos/info. 

[TerraHertz]

Is there really no teardown of a 2901 on the forum already?!   huh...
Well then, yeah, I sure will!!    All that I've done thus far is cleaned the case & face up a bit and poke around inside + test it out. Bad switch, few out of tolerance resistors in the 3.6V power supply rail, faulty 2ns circuit.... (the diode is good, THANK GOD!)  so I suppose a teardown/repair is in order!

https://www.eevblog.com/forum/reviews/tektronix-2901-time-mark-generator-tear-down-inspection/
http://everist.org/NobLog/20141220_Tek_2901_teardown.htm   (my one)

I did eventually end up getting a copy of the Motorola Microelectronics Data Book, 1969 Second Edition, with data for all the RTL ICs. If you need any info on particular chips I can scan them.

[Addicted2AnalogTek]

https://www.eevblog.com/forum/reviews/tektronix-2901-time-mark-generator-tear-down-inspection/
http://everist.org/NobLog/20141220_Tek_2901_teardown.htm   (my one)

I did eventually end up getting a copy of the Motorola Microelectronics Data Book, 1969 Second Edition, with data for all the RTL ICs. If you need any info on particular chips I can scan them.

That's some great info to have!  Thank you for offering, I will certainly take you up on that if the need arises.   From what I can tell thus far though, it appears the only real issue this 2901 has is the 3.6V rail being .5V low.  I already checked and the 10K's, 15K, and the precision resistors are all a good bit out of tolerance.  After that and possibly a few others off the rails into the timing circuits and it should be good to go again. 

[Addicted2AnalogTek]

I almost forgot - here's another addition to my collection ... and the reason why I always ask the seller to add extra protection to the front panel....

[Cubdriver]

Wow!  That could have gotten ugly!  Good thing they listened and put the styrofoam there.  Did THEY put the holes in for the knobs, or did the knobs chew through during shipment?  Either way, from the photos it appears that it made it with controls undamaged, so that's good.

-Pat