I repeat...
Why do you want to see results from out-of-calibration equipment?
What value would it add to your claims and/or your device?
QuoteI repeat...
Why do you want to see results from out-of-calibration equipment?
Such equipment might have rich experience, that's why I want to learn from it.
QuoteWhat value would it add to your claims and/or your device?
NOTHING for my claims & device. Instead, I might adding one gentleman‘s name to my friends' list.
How's that for a solution ?
- your are not hiding anything
- what i request is what i get at the terminals
- if the residual drifts it can be calibrated away.
- no user calculations needed.
I set a value on the device, it tries to set the output as close as possible and tells me the actual (calibrated) output value. I don't have to care about residual resistance. IMHO everything is fine.
The only thing that matters for me is the TC, aging of the resistors and if the relays degrade over time. TC is stated, I don't know if resistors normally change their values over time. Maybe humidity might be a problem?
If I understand it correctly, to get the lowest resistance all relays need to be closed. Is it possible to close all relays manually and just measure the resistance? That would be an easy way to see if the contact resistance of the relays changes as an indication for recalibration / relay maintenance.
Hi,QuoteI set a value on the device, it tries to set the output as close as possible and tells me the actual (calibrated) output value. I don't have to care about residual resistance. IMHO everything is fine.Great.QuoteThe only thing that matters for me is the TC, aging of the resistors and if the relays degrade over time. TC is stated, I don't know if resistors normally change their values over time. Maybe humidity might be a problem?1) TC is ok, in general it's much lower for most points (since different base resistors that with opposite slope can cancel each other on TC).
2) Aging is depending on your actual application. If only for light load application, Vishay 0204 MELF resistor is not that ”fragile“, especially for <=25 ppm grade.
For resistor, in general, the longer you use, the more stable it will be.
Anyway, NEVER overestimate such "general purpose" tool as "resistance standard", since they major in different fields.
3) As for humidity influence, to my experience it can be ignored since QR10 is almost sealed
(Just remember don't let water/dews in).
I will give it a try. So I can check it out and don't have to speculate how it performs.
Now I just have to wait until December...
I will give it a try. So I can check it out and don't have to speculate how it performs.
Now I just have to wait until December...
During the video the device seems to be making bursts of clicking sounds - probably from relays.
I received my unit today and doing a quick manual test all seems to work well. I also got a nice calibration/test report via email.
One thing that confused me was is you can switch between different display modes which seem to work differently with value entry and it wasn't accepting my input. It is hard to read the tiny display even with my reading glasses, so using PC control might be the way to go - that is really my intended use.
At least lots of button pressing eventually got me back to an entry mode that worked. Maybe I will real the manual properly now I have it in front of me.