[FT] xDevs.com KX LTZ1000A fairy-tale, or the story of little jumper.

[HighVoltage]

Dr.Frank,
My plan is to have my 3458A adjusted and calibrated to the higher specs and I want the multi page calibration report. But I have not even started to talk to KS. May be I will visit KS Boeblingen first to see their capabilities and then make my mind up. On the other side, I can also have it calibrated in Hamburg against a calibrated 732A. But first I will have the instrument running for a few more month to get it stable.

[Dr. Frank]

Hi Frank,

Here is a page from the certificate. I hope it answers your question.

Cheers

Alex

Alex, definitely.. your 10VDC uncertainty will be around 3ppm, probably better, as the 10Vdc reading of your instrument is given to < 1ppm resolution, and the "Golden 3458A", which defined the limits, may have been less uncertain than 1ppm.

For sure, this calibration did cost a fortune. 

Frank

[plesa]

Alex, definitely.. your 10VDC uncertainty will be around 3ppm, probably better, as the 10Vdc reading of your instrument is given to < 1ppm resolution, and the "Golden 3458A", which defined the limits, may have been less uncertain than 1ppm.

I have same uncertainties like Alex, because we are sharing calibration lab

[mimmus78]

At the end I ordered 2 more sets of resistors (the one DR. Frank used) ... unfortunately there was no stock of 1K value up to the end of this month. So it's still waiting time ...

I'll build a couple of pieces with TiN PCB and use this as reference. After this I will build a couple with my "new" design.

In this new design, I'd like to experiment a little new gimmick with a "new" schematics that is my interpretation of years of post of the old LTZ1000 thread.

It will be not an extreme design, just take the best ideas of the old thread and put all together (some Andreas's noise reduction caps, Solartron's caps on the heater and the new op-amp TiN used in his last build, but I still have to decide final op-amp).

I'd like to add also a buffer for the 7V output to prevent problems with shorting the zener. Maybe also revive the 7.X to 7 and 7 to 10 ratio scaling used by Dr. Frank.

Hope I have time and skills to complete the design with some good result (I have not such experience with analogue stuff).

Inviato dal mio Nexus 6P utilizzando Tapatalk

[Zucca]

mimmus78 please consider to do more boards when you are ready. I would like to buy one... may I?

[TiN]

Zucca, where is the one assembled one you have already?

[mimmus78]

mimmus78 please consider to do more boards when you are ready. I would like to buy one... may I?

Added you to overbooking list.

I still have 8 spare from some users here they didn't confirmed, I will wait up to the end of the day and than offer to the one that are on queue on the overbooking list ... anyway another lot is going to be fabricated.

D.

UPDATED:

Packaging and shipping on Friday:

 - Nuno_pt             3pcs       -      PM SENT - Portugal zone 1 - priority mail 3.50 EUR - registered 7.90 EUR

Shipped:

 - VK5RC              3pcs       -      PM SENT - Paid - Registered
 - t2kv                    2pcs       -      PM SENT - Paid - Registered
 - klaus11              2pcs       -      PM SENT - Paid - Priority
 - HighVoltage       2pcs       -      PM SENT - Paid  - Registered - overbooking list
- pelule               3pcs       -        PM SENT - Germany zone 1 - priority mail 3.50 EUR - registered 7.90 EUR
 - Mimmus78         3pcs       -      that's me

Confirmed waiting for payment:
 
 - msliva               3pcs       -        PM SENT - Czech Republic  - zone 1 - priority mail 3.50 EUR  - registered 7.90 EUR

Confirmed but in overbooking list (do not pay - wait I receive second lot):

 - SvanGool         2pcs        -     Netherlands  zone 1 - priority mail 3.50 EUR  - registered 7.90 EUR - overbooking list
 - fanOfeeDIY      2pcs       -       Japan - priority mail 5.50 EUR  - registered 9.95 EUR - overbooking list
 - kutte                2pcs.    -       Germany  zone 1 - priority mail 3.50 EUR  - registered 7.90 EUR - overbooking list

=============================
TOTAL                                  22 pcs
wait list (overbooking)          4  pcs

[Zucca]

Thx mimmus just one thing I am in Germany not in Italy...  ma sono italiano...

TiN... the one I have is just ready for testing my K2001. Later I plant to put it in the K2001 ADC replacing the VR801 6.4 V Zener...  just curious to see what will happen

[Zucca]

Ohh I got a PM from Mimmus confirming that the boards in discussion is the TiN one... but I meant the Mimmus new design one, which is not ready yet. Soo please take me out from the list and put me in he new one of your design.

Thanks TiN again for sending me his wonderful KX LTZ1000A board.

[mimmus78]

@zucca no problem ... I'll keep you posted if I manage to finish my design in next weeks.
@Nuno_pt I will ship your package on Friday.

As in not hearing from msliva in days I will send PM for payment instruction also to the overbooking list ...

[mimmus78]

I don't understand why use VR801 as integrator reference? Any reason why not route LM399 ref signal there?

[SvanGool]

@mimmus78, as you requested to report on the forum:
I sent you the money for: - SvanGool         2pcs        -     Netherlands  zone 1 - priority mail 3.50 EUR - overbooking list

Thanks !

[mimmus78]

3 more PCB to go.

[kutte]

20,00 Euro for 2 boards via priority mail sent from kutte

[mimmus78]

Thanks Guys, PCB are over.
I didn't hear from the fab for the "fixed" batch, I will let you know when then new batch will arrive.
Anyway let me know if someone else is interested.

[dr.diesel]

Anyway let me know if someone else is interested.

If you end up ordering another batch, I'll take 5 to the USA.

[fanOfeeDIY]

Hi mimmus78,

Thank you for your message. I am in the overbooking list.
I missed reading it last night, but it is fine. I will wait for the next batch.

[mimmus78]

UPDATED:

Packaging and shipping on Friday:

Shipped 18/11/2016:

 - Nuno_pt             3pcs      -     PM SENT - Paid - Priority
 - SvanGool           2pcs      -     PM SENT - Paid - Priority
 - kutte                   2pcs      -     PM SENT - Paid - Priority

Shipped 11/11/2016:

 - VK5RC              3pcs       -      PM SENT - Paid - Registered
 - t2kv                    2pcs       -      PM SENT - Paid - Registered
 - klaus11              2pcs       -      PM SENT - Paid - Priority
 - HighVoltage       2pcs       -      PM SENT - Paid  - Registered - overbooking list
- pelule               3pcs       -        PM SENT - Germany zone 1 - priority mail 3.50 EUR - registered 7.90 EUR
 - Mimmus78         3pcs       -      that's me

Confirmed:
 
 - msliva               3pcs       -        PM SENT
 - fanOfeeDIY      2pcs       -       PM SENT
 -  dr.diesel           5pcs       -       PM SENT
 - z01z                  3pcs       -       PM SENT

[mimmus78]

So this is what I elaborated. This is based mainly on last revision of battery powered reference from "andreas".

I added reverse polarity power protection.
Removed some caps that Dr. Frank defined as "fear" caps.
I removed the MOS that drive current to the zener.
Using LTZ1000 (not A version)

I was thinking to add some basic output protection to the REF ... what you think to add something like this (with opportune op-amp):



 just after the buffered output of the LTZ1000A?



As usual care to thermal EMF is a must. Hope it will not upset much the output.

[Zucca]

Mimmus can you put some 0R jumpers or somenthing to separate the heater power supply path from the rest? See TiN article here:

Solder coax wire to +18.5V and power GND to provide separate current path for LTZ’s heater, so it would not upset reference output

[Zucca]

I don't understand why use VR801 as integrator reference? Any reason why not route LM399 ref signal there?

+1 I really don´t know why...

[mimmus78]

Mimmus can you put some 0R jumpers or somenthing to separate the heater power supply path from the rest? See TiN article here:

Solder coax wire to +18.5V and power GND to provide separate current path for LTZ’s heater, so it would not upset reference output

I added R10 just before the heater transistor, this can be 0R or used also to split VCC.
I don't know if is good to add also on the GND side.

[mimmus78]

Hi guys, I got called from DHL because there is a new parcel for me (and I wasn't home) ... so guess what it will be?
I will let you know when back in home if it's some gift from unknown or if it's the new KX pcb batch.

[mimmus78]

New pcb lot arrived. This new lot has no missing part on the guard ring around LTZ1000.

I will ship this new lot in parcels shipping tomorrow, and it seems we will have enough pieces also for how was in the overbooking list.

If someone that get the old PCB cannot sleep with the mistaken one I can ship the new corrected PCB for free (you just pay postage). This offer is valid just for few days.

I will send pm later to the ones that where in overbooking list.





Inviato dal mio Nexus 6P utilizzando Tapatalk

[Andreas]

So this is what I elaborated. This is based mainly on last revision of battery powered reference from "andreas".

Hello,

are you shure that C10 is on the "right" side of the resistors?

With best regards

Andreas