Calibrable el cheapo sig gens - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: November 12, 2024, 11:54:34 am
content: hiis there some cheap signal generators who's their calibrations procedures are known in the wild ...I know we have Siglents Rigols Fluke Waveteks, Uni-t and others.. and can be sent to cal labsBut i 'm more curious about the low end ones, Juntek, Feeltech, the ones based on fpga / r2r technologymostly to calibrate their main osc / time base frequency if it is possibleIf you have some in minds do tell i'm all earsthks

author: Aldo22
author_rank: Super Contributor
timestamp: November 12, 2024, 12:27:35 pm
content: What exactly is the purpose?I have the super cheap FY3224s and the frequency can't get any more accurate than it is with this device.The amplitude settings are somewhat inaccurate.In the attached screenshot 500.000Hz.

author: nctnico
author_rank: Super Contributor
timestamp: November 12, 2024, 12:40:50 pm
content: Calibration is not about precission, it is about determining whether the device is still within specifications (tolerance limits). Having the calibration done by a certified lab, gives you a traceable calibration and thus some assurance that the measurements made using the device really are within tolerance limits.Things get hairy though when a device isn't within specs (=failed calibration) as this means that every measurement done between previous (good) calibration and the current (failed) calibration is suspect and needs to be re-done using a device which is within specs.I'm not sure whether it is worthwhile to send a $50 generator to a cal lab. The price for the calibration will likely be a multiple of the price of the generator itself.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 12, 2024, 01:09:30 pm
content: The purposes is : avoid sending or try sending theses cheapos to cal labAnd be extorted 160$ CAD for theses non calibrable Juntek jds2900 we have bought, we bought them just to help do things fast, under no certifications, field tests under no precision / certificationsBut we have intestinal fights, where i say: do not send theses !%% and they insist to make them certified, certified in whatNow we have bought few Rigols and lots of Siglent stuff, 3x sdg 1000x, 3x ssg3000x, scopes, spectrums, etc .... now more than enough to have certifiable equipment, and references ... if needed, They don't go in the fields.But the fight over theses 100$ "things" .... that's why i want to know cheap models who can be corrected in some ways if they are out of specsI know not to expect miracles out of theses things, mostly checkups (This is easy loll, and happy with this)thks

author: Aldo22
author_rank: Super Contributor
timestamp: November 12, 2024, 01:32:26 pm
content: I've had my FY3224s for 16 months now and the accuracy is better than the precision.I mean, I can adjust it in 10mHz steps, but it is accurate to 1mHz (says the oscilloscope).What do you want to calibrate here, what accuracy do you need?It's $50. if one day it's not accurate enough, I'll order a new one, because all the other options are probably more expensive.I'm not worried about that.

author: Aldo22
author_rank: Super Contributor
timestamp: November 12, 2024, 01:42:23 pm
content: I remember now, FY3200s has an option. See attachment.I've never used it.

author: MarkF
author_rank: Super Contributor
timestamp: November 12, 2024, 02:14:04 pm
content: Quote from: coromonadalix on November 12, 2024, 01:09:30 pmIt seems to me that if "Management" insists on all your test equipment being calibrated, it would be better off getting rid of all the cheap stuff and use the money saved on their calibration to buy more of your better equipment that has a defined calibration path.A perfect excuse to upgrade...

author: tszaboo
author_rank: Super Contributor
timestamp: November 12, 2024, 03:46:45 pm
content: Quote from: coromonadalix on November 12, 2024, 01:09:30 pmYou have a quality manager who wants to calibrate everything.I see two options, you can either slap an "Uncalibrated" label on them. Or a "Scrapped label" on them and take them home for a nominal fee. And try not buying equipment without a cal certificate in the future.I certainly prefer this situation over the situation where I have to fight to get essential test gear calibrated.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 12, 2024, 04:19:55 pm
content: thks i'm trying to get thoses ...... far awayyyyybut i was trying to find some for easy portability, and be able to certify themwitch sound at some point not plausiblei had in mind some of the uni-t models have to see if we can certifiy / calibrate them if neededthe Junteks jds2900 can not support shorts or very low impedance for long, smd in them burns, dont know for others low end onesthe TTi Rigols Siglent are okay, (half rack width) but portability

author: Aldo22
author_rank: Super Contributor
timestamp: November 12, 2024, 04:26:28 pm
content: Quote from: coromonadalix on November 12, 2024, 04:19:55 pmFY3200 manual says: "All channels can work more than 60 seconds when the load is short-circuited."