Hum. you need to make things right. That jpg probably won't work.
A low resolution does not work becouse depening on the size it can have some pattern, and you do not want that.
The barcode needs to be vector. The only alternative is to have a pure monocromatic file. But in my opinion at 600-1200ppi.
It is quite easy to have a vector barcode. Download Corel Draw free for 30 days and generate one. It needs to be on a plain ink, for example c0m0y0k100
The one that should run a test is not the printer. It is you or your client with the same type of scanner you need in real life. Is it a hand held device for inventory and logistics? or is it for a retail store? etc.
A barcode needs to be of specific measures depending of the package and orientation. Yes, it can be smaller on a farmaceutical flask than on a refrigerator's box. So you need to consult a documentation for the case.