Products > Test Equipment
Siglent SPD3303X-E Hi-Resolution Output Unlock?
tv84:
--- Quote from: blurpy on July 01, 2021, 06:58:11 pm ---Just wondering what the accuracy is like after an upgrade like that? I guess it's calibrated as a 10mV/10mA device even though it can do 1mV/1mA. In that case it's probably random how accurate it is on the 1mV/1mA range?
--- End quote ---
What is the probability of something that is random in between 1-9 tenths and then, when you reach the full tenth (10, 20, 30 etc.), it gets accurate? :-// ???
tautech:
--- Quote from: blurpy on July 01, 2021, 06:58:11 pm ---Just wondering what the accuracy is like after an upgrade like that? I guess it's calibrated as a 10mV/10mA device even though it can do 1mV/1mA. In that case it's probably random how accurate it is on the 1mV/1mA range?
--- End quote ---
Precision can be trimmed.
See Chapter 3 Calibration instructions in the Service manual:
https://www.siglenteu.com/wp-content/uploads/dlm_uploads/2019/07/SPD3000X-Series-Service-Manual.pdf
blurpy:
--- Quote from: tv84 on July 01, 2021, 07:06:44 pm ---What is the probability of something that is random in between 1-9 tenths and then, when you reach the full tenth (10, 20, 30 etc.), it gets accurate? :-// ???
--- End quote ---
What is the probability of it being accurate on the full tenth if you only test in increments of 10?
Lets say Siglent tests it with a load of 10mA and it displays 0.01A, and with a 20mA load it displays 0.02A. That looks perfect. Then a user upgrades and gets an extra digit. With a 10mA load, what does it display? Perhaps 0.010A? Perhaps 0.019A? It could be perfectly spot on, or up to 9mA off.
But I have no clue how they do this, so they might also do calibration in a way that the tens are verified to be accurate.
--- Quote from: tautech on July 01, 2021, 08:37:15 pm ---Precision can be trimmed.
See Chapter 3 Calibration instructions in the Service manual:
https://www.siglenteu.com/wp-content/uploads/dlm_uploads/2019/07/SPD3000X-Series-Service-Manual.pdf
--- End quote ---
Thanks!
2N3055:
I would presume calibration is automated, so all readouts and writes to PSU are over SCPI. Which might have full resolution. There are many instruments that return additional digits (more than on screen) over SCPI.. So it might be as well that it is calibrated in full precision despite display not showing last few digits..
mawyatt:
--- Quote from: tautech on July 01, 2021, 08:37:15 pm ---
--- Quote from: blurpy on July 01, 2021, 06:58:11 pm ---Just wondering what the accuracy is like after an upgrade like that? I guess it's calibrated as a 10mV/10mA device even though it can do 1mV/1mA. In that case it's probably random how accurate it is on the 1mV/1mA range?
--- End quote ---
Precision can be trimmed.
See Chapter 3 Calibration instructions in the Service manual:
https://www.siglenteu.com/wp-content/uploads/dlm_uploads/2019/07/SPD3000X-Series-Service-Manual.pdf
--- End quote ---
Recall following this cal procedure when we got our first SPD3303, results were OK. Now need to do same on the one we just received, but it's already involved in a setup {need +- 12V, +5V (variable), +1V (variable), +2.5V (variable), +5V, +6V and +-100V :o } along with the first, so this cal procedure will have to wait.
Best,
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