Author Topic: Project KX : DIY calibrator / reference source/meter  (Read 176893 times)

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Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #75 on: April 30, 2014, 08:18:52 pm »
LN2 overclocking (cooling CPUs/GPUs for higher performance). Kinda like a sport thing.


:)

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Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #76 on: May 01, 2014, 11:00:19 am »
Also regarding question about VPG foils.

Their foil resistor elements are mounted on substrate via thick adhesive, which reduces stress from thermal expansion/contraction forces from substrate.
Something similar to approach used in LTZ1000 die mount, I guess.
They provide service for accelerated aging and can ship resistors which are already pass initial aging/drift effects, with little cost adder to final price (I heard it's
around few USDs, but don't have exact data on this).

I just ordered resistors without special aging procedures, as I'm interested to perform various tests on some of units,
while keep others in different conditions, so I could see effects on aging myself.

I hope this answers a question.
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Offline CaptnYellowShirt

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #77 on: May 01, 2014, 03:47:19 pm »
LN2 overclocking (cooling CPUs/GPUs for higher performance).


Heh. The sport of kings!

Were you one of the guys that got high-fived at the end of the video?
 

Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #78 on: May 03, 2014, 11:39:41 am »
No, but you can just google my nickname.

This will be a host for VREFs.
LTC1043 for voltage conversions, differential signaling,
onboard LDO and buffers. All three VREFs will have own power monitoring
and cutoff.

Little AVR in corner will handle control and health monitoring.

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Offline BravoV

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #79 on: May 03, 2014, 11:50:55 am »
No, but you can just google my nickname.
Hmm... Googled and 1st entry I got this ? -> TiN  :-DD

Offline CaptnYellowShirt

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #80 on: May 03, 2014, 03:19:28 pm »
No, but you can just google my nickname.


Pretty damn impressive.
 

Online Andreas

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #81 on: May 03, 2014, 06:33:07 pm »

LTC1043 for voltage conversions, differential signaling,


7V * 4 will be too much for the tortured LTC1043.
Or how do I have to understand the *4 section?

With best regards

Andreas
 

Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #82 on: May 09, 2014, 12:27:26 pm »
*4 domain will be not based on LTC1043.
I'm still study best way to do all ratios.

Meanwhile some more supply arrived, this time medical-grade triax cable.



Got greedy, and aquired 3 pieces 9m each.

Specs:

0.12 OD
38 AWG silver-plated copper outer shield, 0.02 ohms resistance per ft.
40 AWG tin-plated copper inner shield, 0.02 ohms resistance per ft.
29 AWG steel, copper silver-plated inner conductor, 0.25 ohms resistance per ft.
TFE inner dielectric
TTFE outer dielectric
PVC jacket
Signal leakage rate - 1 x 10(-14) Amps

Operating Frequency : ? 1 GHz
Impendance : 55 ± ?
Capacitance : 100 pF/m
Insulation resist : > 1000000 M?m
Test Voltage : 2 kVrms
Operating Voltage at sea level : 1 kVrms
Inner Cond Res DC typical : 1728 ?/km





Don't have triax connectors, price for those is scary...
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Offline Zucca

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #83 on: May 09, 2014, 01:45:29 pm »
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 

Offline CaptnYellowShirt

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #84 on: May 09, 2014, 04:48:43 pm »
For the bulkhead connector side (female?), take a look on ebay at devices listed under "North Hills Data Bus"

For the older versions* of these hubs, you can cut the box open, dig out the potting material and recover the triax connectors. I've gotten a few this way and they're way cheaper than the $22/ea digikey charges.




*The older versions can be identified because the box is soldered or welded closed while the newer versions have a screw-on top or bottom.
 

Offline facumedica

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #85 on: May 09, 2014, 10:12:31 pm »
I'm really impress! I didn't know there was a name for my "crazyness" (volt-nuts).  :-DD I am getting into measurement instruments too, but not that deep into it, 'cause I'm just a student  :-/O
Imagine a 8 1/2 digits multimeter/power supply/oscilloscope that runs it's own Linux, that would be kickass  :box:
I really enjoy reading, keep posting please!!!  :clap:
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The youth gets together his materials to build a bridge to the moon, or, perchance, a palace or temple on the earth, and, at length, the middle-aged man concludes to build a woodshed with them.

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Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #86 on: May 27, 2014, 12:35:42 pm »
Some more candies arrive today...





These will be used for LTC1043's and switching. Big capacitance polypropylene are too bulky and expensive at a moment, so decided to try worse polyester ones.

Still waiting for Vishay foils...
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Offline nack

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #87 on: May 27, 2014, 12:58:09 pm »
Nice project to follow ;)
 

Offline krivx

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #88 on: May 27, 2014, 02:34:54 pm »
No, but you can just google my nickname.


Pretty damn impressive.

Am I missing something?
 

Offline scimitar

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #89 on: May 27, 2014, 03:22:37 pm »
what can i do in matter of voltage/curent reference with some 0,01% vishay rezistors?
 

Offline peter.mitchell

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #90 on: May 27, 2014, 03:33:21 pm »

Am I missing something?


TiN is a professional overclocker/hardware engineer (i guess you could say?) from Ukraine who works at EVGA in Taiwan (i think), by himself he has set a number of overclocking records, and with others has set many many more.
TiN is a prominent member of the extreme overclocking community (but tends to avoid big-noting himself, hence his above comment), helping people with modifying hardware to get the best possible overclock, he has built a massive programmable loads to test power supplies and much much more.


Annny wayyyyyy, wow, those are some impressive resistors back over on the previous page, however i would feel dirty/uneasy knowing they have been harvested from some poor piece of equipment.

The resistors that you fixed up, were they just broken at the terminations? If so, how did you fix them up? Remove the coating off the wire and crimp it in place or something?
 

Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #91 on: May 27, 2014, 05:11:37 pm »
what can i do in matter of voltage/curent reference with some 0,01% vishay rezistors?

Well, you can build some nice reference check device to use as a tester for multimeters/scopes etc, specially if you have access or friends who
can measure your resistors with good calibrated benchtop meter, so you will know actual value. Don't forget to record temperature as well, as
most of resistors drift by some amount with change of temperature.

Quote
The resistors that you fixed up, were they just broken at the terminations? If so, how did you fix them up? Remove the coating off the wire and crimp it in place or something?

I might need to record another video or timelapse covering that.  >:D Most of damaged resistors have damaged edge with dozen of windings broken (open).
And epoxy paint over the resistor wire is not high-temperature, it melts when soldering, so it's all not so easy to fix.
Specially considering that wire is really thin, in range 0.02-0.05mm diameter. So I have to use binocular microscope and sharpest tip.
Worst part that wire is barely solderable, as it's likely to made from manganin :) For few resistors I removed few turns, so resistance dropped (for example 40K -> 37K766 ohm), but since I will use them only as transfer points and I have enough meters to measure them accurately, I don't really care for exact value.

I fixed 3 or 4, and need to fix some more. Most still working perfectly, non-damaged, so I consider it's good score for money.

Quote
however i would feel dirty/uneasy knowing they have been harvested from some poor piece of equipment.

I don't care, 99% of my gear is bought second-hand / often broken, it's part of my hobby to repair good old gear and give it second life.
And as of Fluke resistors, i'm pretty sure they were from some hi-end gear, as little of devices use expensive big 5ppm/°C hand-made resistors :)
« Last Edit: May 27, 2014, 05:15:26 pm by TiN »
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Offline krivx

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #92 on: May 27, 2014, 06:08:37 pm »

Am I missing something?


TiN is a professional overclocker/hardware engineer (i guess you could say?) from Ukraine who works at EVGA in Taiwan (i think), by himself he has set a number of overclocking records, and with others has set many many more.
TiN is a prominent member of the extreme overclocking community (but tends to avoid big-noting himself, hence his above comment), helping people with modifying hardware to get the best possible overclock, he has built a massive programmable loads to test power supplies and much much more.


Ah OK. None of this came up when I googled him
 

Offline peter.mitchell

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #93 on: May 28, 2014, 06:45:14 am »
I don't care, 99% of my gear is bought second-hand / often broken, it's part of my hobby to repair good old gear and give it second life.
And as of Fluke resistors, i'm pretty sure they were from some hi-end gear, as little of devices use expensive big 5ppm/°C hand-made resistors :)

True, probably out of some old standard, though it is kinda odd to see such a variety - did they all come from the same source, or  a bit of shopping around?

Also, a video would be neat!
« Last Edit: May 28, 2014, 07:56:12 am by peter.mitchell »
 

Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #94 on: June 20, 2014, 11:35:04 am »
Got some VPG's today.
Took longer than expected and more higher specced parts are to come later in Aug/Sept.

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Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #95 on: June 20, 2014, 04:55:15 pm »
Goodies:



First arrival are plastic Z202T's for 120R,12K,10K,13K and 1K and hermetic VHP202ZT's (70K, 120R and 1K).



Individual packing, VHP's in plastic boxes, while Z202's just plastic bag, without even silicagel :)



1K0000 0.01% VHP202ZT



And with it's label and batch information. 35 $USD a pop...



And measurements..+26°C airtemp

Calibrated in february 2014, Kei 2001:



Calibrated in end of January 2014, SMU Kei 2400:



Keithley 2002, Last calibrated in 2007.



Now I can start testing my LTZ design, finally.
Also will do TC and stability measurements after I got some LabView coding with TEC module and setup building.
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Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #96 on: June 21, 2014, 12:49:10 pm »
For 70K there will be hermeticals, rest values will be Z202, except one unit, with all hermetical resistors.



Also will be one with "regular" RNC55's and one with Fluke wirewounds.

Time to buy some LTZs from Linear website and get busy.
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Offline facumedica

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #97 on: June 24, 2014, 02:27:45 pm »
I was waiting for an update like this!  :-+ Thanks for sharing!
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The youth gets together his materials to build a bridge to the moon, or, perchance, a palace or temple on the earth, and, at length, the middle-aged man concludes to build a woodshed with them.

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Offline quarks

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #98 on: June 24, 2014, 05:18:43 pm »
For 70K there will be hermeticals, rest values will be Z202, except one unit, with all hermetical resistors.

is this by purpose or accident?
The 70k resistors should not be as critical as the other 3 values, therefore, would it not be better to have it the other way arround if you need to save money?
 

Offline TiNTopic starter

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Re: Project KX : DIY calibrator / reference source/meter
« Reply #99 on: June 24, 2014, 07:34:30 pm »
It was on purpose, as Z202 single chip are not available in 70Kohm value (too big package), and cost difference was not that much, so I used VHP for 70K instead.
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