Author Topic: ESI SR104 leaking oil  (Read 3404 times)

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Online Dr. Frank

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Re: ESI SR104 leaking oil
« Reply #25 on: March 30, 2018, 10:19:29 pm »
Illya, very nice SR-104 standard, congrats.
I assume, there will be not much further change in resistance value, as it's already within 0.5°C from the recent calibration temperature.

Isn't the actual weight written on that yellow sticker on the vertical wall of the box?

Frank
 

Online TiN

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Re: ESI SR104 leaking oil
« Reply #26 on: March 30, 2018, 10:26:02 pm »
Dr.Frank
Ah, yes, that's sticker from seller, says 5.7kg with unknown uncertainty, for what it's worth.  :-DD

My FSL935 now going for second calibration to establish 6 month temporal stability and then will be shipped to me, so I can use it to compare with this SR104 and measure tempco of SR104 and my meters TCR more accurately, since FSL935 have 4 times less tempco then this SR104 lid passport.

I'll also have access to lab with magical 8508A-001 to try bridge transfer FSL935-SR104 in following months. That will be interesting test, if all that hype of 8508A performance worth the money  :-DMM.
« Last Edit: March 30, 2018, 10:28:07 pm by TiN »
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Offline dl1640

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Re: ESI SR104 leaking oil
« Reply #27 on: March 30, 2018, 10:37:30 pm »
So good. You are able to calibrate your 5700 at any time. My standard resistor is 50ppm rating wire wound type, that's the best I have.

 

Offline nikonoid

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Re: ESI SR104 leaking oil
« Reply #28 on: March 30, 2018, 11:43:54 pm »
Illya, congratulations on a great pickup. Mine also came from Australia. 5.7kg seems consistent with newer design Sr104. Mine in older and for some reason is quite a bit heavier.

With sounds of the oil: I had to tilt it a lot, like at almost 70 degrees to hear any sloshing.

I am really interested in seeing your tempco curve for, when you get to it.
 

Offline ramon

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Re: ESI SR104 leaking oil
« Reply #29 on: March 31, 2018, 12:31:59 am »
I don't have a scale to measure weight.  :)
Every post office in taiwan has a really nice Mettler Toledo scale   :-DD

Quote
only -1.0 ppm off the value in 2016 calibration report (10000.0011 Ohm +/-1ppm at +23.34 C well temperature).  :-+
And how do you know if it is actually your NTC that is off spec instead of SR104?
 

Offline ManateeMafia

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Re: ESI SR104 leaking oil
« Reply #30 on: March 31, 2018, 12:35:14 am »
ramon,

Good point on NTC. TiN buy that Fluke probe and thermometer already!   :-DD
 

Online TiN

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Re: ESI SR104 leaking oil
« Reply #31 on: March 31, 2018, 12:42:30 am »
And how do you know if it is actually your NTC that is off spec instead of SR104?
NTC on graph is the one inside SR104 oil tank, it's part of the standard. Measured by second 3458A, so I have no doubts about that :).
Sorry it wasn't obvious that -1.0 ppm is great result, as 3458A-HFL annual spec for 10 kOhm is 8 ppm, 24 hour spec is 2.2 ppm.
Standard 3458A is even worse (granted, as specification reflect old non-updated units).
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Offline ramon

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Re: ESI SR104 leaking oil
« Reply #32 on: March 31, 2018, 01:01:00 am »
And how do you know if it is actually your NTC that is off spec instead of SR104?
NTC on graph is the one inside SR104 oil tank, it's part of the standard. Measured by second 3458A, so I have no doubts about that :).
::)  Well, the next question is ... ( >:D ) : how can you be so sure that the NTC resistor didn't drifted at all but the 'standard' resistor indeed did?   :o
 

Online TiN

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Re: ESI SR104 leaking oil
« Reply #33 on: March 31, 2018, 01:03:36 am »
I don't follow, so far there is nothing wrong at all with either.  :-//
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Offline ramon

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Re: ESI SR104 leaking oil
« Reply #34 on: March 31, 2018, 02:03:48 am »
The man with two resistors problem.

Which one is the reference? It is the NTC resistor, and then the 10K 'standard' drifted -1 ppm?
Or it is the 10K standard the reference resistor and then it is the NTC resistor which has drifted?

Or did actually both 10K and NTC resistors drifted? And then, which one is expected to drift more?
In other words ... Is that ESI SR104 a big case for an NTC resistor worth US $9,000 plus a 10K 'standard' resistor besides given as gift. Or the other way around?

You will definitely need that Fluke probe and thermometer !  :-DD
 

Online TiN

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Re: ESI SR104 leaking oil
« Reply #35 on: March 31, 2018, 05:05:00 am »
3458A alone is not suitable instrument to establish a drift of primary resistance standard like ESI SR104.
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