Products > Test Equipment
60W Electronic Load in 2022
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DavidDLC:
When I got mine, I got it because a review somebody did on it, the person mentioned it was very accurate. Then I got mine and yes it was very accurate. Unfortunately I cannot find that review anymore. Another person posted here that his was also, so somehow these units were adjusted/calibrated (maybe I should not use the word calibrated). Let's use adjusted from now on.

"If you don't have the time to screw around with cheap tools for your business, then don't buy them." I never mentioned I don't have time, I just don't like when people post comments that not help with the topic. I mentioned I don't have a business case to get an expensive one, and my comment is pretty valid. I can deal with cheap tools and I have time to get one.

There is nothing wrong with me trying to get this little tool that fits my purpose. Even if it is $20.00. Now if I don't get one I already have a plan, but still can look for recommendations.

I know still people will post negative comments after this, instead of doing that, try to help. My question was very specific:

If you lately bought this model and it is accurate let me know.

If you have not, try not to respond. How hard is this ?

David DLC
janoc:

--- Quote from: macboy on December 06, 2022, 01:48:36 am ---The one by janoc, and yours.
In a specific context, "calibration" means verified against a traceable standard. This is very clearly not that context. In this context, the OP very clearly used calibrated meaning adjusted to be accurate. Very clearly. To anyone. Even you.

--- End quote ---

And before you lecture someone on sarcasm I suggest you actually read what I wrote. I have clearly indicated/asked the OP whether they didn't mean accuracy instead of calibration, so that point wasn't lost on me.

However, the rest still stands. If someone expects any sort of accuracy from such cheap device where you get whatever parts were left over this week in Shenzen, I don't know what to say to that. There are no precision components in that, so that large tolerances and offsets are to be expected as is drift with temperature. The OP never said how was that 20mA offset measured, at what load, how hot the thing got (esp. the Zener diode which seems to be the only reference there). And if they really do need it to be that accurate, it shouldn't difficult to adjust some of the resistors on the opamp measuring the voltage drop on the shunt to bring it in spec. Even though I am not sure why anyone would need/want to do that given that it is practically guaranteed it will drift again pretty soon.
tunk:
See if the main PCB says "ZHIYU ZPB30A1". If not, then you may have
a lower quality clone. Is the offset constant through the current range?
If not, then you may be able to adjust it:
- if showing too high current, file a little bit off the shunt.
- if too much, add a bit of solder.

Review by member HJK:
https://lygte-info.dk/review/Review%20Electronic%20load%2060W%20UK.html
BillyO:
You really do not have to have it "adjusted' to perfection for it to be calibrated.  You just need to document it's differences WRT to something of known accuracy.

Go buy one of these, get a hold of the good DMM that is known to be accurate (a recent "calibration to standards" certificate) then document any errors over the range it will be used.  Your document is now the calibration for your load even if it cannot be adjusted to match.

For example, if it is off by 20% high throughout the range of interest, then all you need to do is adjust it's readings by (100/120)=0.8333333 to get accurate results.
Mechatrommer:

--- Quote from: macboy on December 06, 2022, 01:48:36 am ---
--- Quote from: Mechatrommer on December 06, 2022, 12:54:27 am ---
--- Quote from: DavidDLC on December 06, 2022, 12:27:27 am ---I don't want to be dis-respectful to anybody but if you don't have any positive comments just don't waste the time here. I didn't make this post for entertainment, I'm looking for help here
When I get a notification on my email with a response to this comment, I'm hoping to get help, I'm not hoping to get sarcastic comments

--- End quote ---
which one earlier posts is sarcarstic? if you think $20 is worth the hardware and traceable calibration included and all the works involved, then you are making an insult to the manufacturer... and anyone here with experience.

--- End quote ---
The one by janoc, and yours.
In a specific context, "calibration" means verified against a traceable standard. This is very clearly not that context. In this context, the OP very clearly used calibrated meaning adjusted to be accurate. Very clearly. To anyone. Even you.

--- End quote ---
if trying to explain the situation the OP is not aware of is being sarcastic, your post is also sarcastic... let me explain what you are not aware of... politely... traceable calibration was first mentioned here by alm, so is he being sarcastic too?.. and thats what understood by most technical person... and OP clearly mentioned calibration, not accuracy. but then both are related, to make one device accurate, you have to compare with another more accurate device, thats what we call calibration and tracability. and we are not aware of cheap device to make another device calibrated (properly according to eevblog community's norm). ask OP what he is using to comfirm his $20 dummy load is off? so i guess you have sort of attention disorder, or a disorder where people only want to hear what they want to hear, truth is not one of it... congratulation you are now one of people in my "most honorable" list (if you really can feel me of what being sarcastic)
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