Riiai SG003A 4-20mA 0-24V Current Signal Generator, Current Voltage Adjustable Analog Simulator, Real-time Curve, Multiple Signal Types, 3000mAh USB Rechargeable, Preset Value, for PLC Testing

Works easy enough and at a great price. Good portability and good battery life. Good quality.

This little thing is absolutely incredible. If I can find a use for it will be buying the higher end one too that can emulate thermocouples. The manual is helpful if you are REALLY good at reading manuals. Otherwise, there are loads of YouTube videos online. I really realized how good this thing is when I was using a $4k fluke process meter to calibrate it. I could only get the calibration to 0.005, but I’m fine with that. The big thing is this can put out an actual 24vdc (even up to 25vdc!) and the $4k process meter can only do ~20vdc. I had to set up a 24v power supply (measured to 24v exact) to calibrate that input. The 0-20mA is just as good!

Overall a very useful piece of test equipment with a few minor issues. Readings for analog inputs and outputs were very close to much more expensive test equipment we have at work. Good enough for my purposes. I love the rechargeable battery vs swapping alkalines, it charges fast and lasts a long time. The documentation isn't great so it takes a minute to figure out how to wire it. Same goes for the menu system. My unit had a couple of typos in the on screen text. I also couldn't figure out how to update the firmware. I'm not counting on a lot of support for something like this and it works fine as is, so I'm not worried about it.

When it comes to testing electronic circuits or troubleshooting electrical systems, having a reliable and precise current signal generator is essential. Enter the Current Signal Generator—an indispensable tool that met my expectations. This unit allows you to supply a signal and test a sensor simultaneously.

Got this for work.. Took a few to figure out the settings, but once that hurdle was crossed it works good.

When I first looked at the Signal Generator, I was amazed how small it was, I’m used to working with much larger units. But the number of features and functionality was amazing. So don’t let the size fool you. Took a bit getting use to, like any fine instrument, but with the help of a well-defined manual, all worked out fine. I can go on about this product how impressed I am with features, just look at the vendors description, it’s spot on.

Returned. It was not worth the effort to figure it out, and I make my living figuring things like this out. I have used many simulators over my career, and when I had given up on this one, I borrowed one that was another brand, which I had never used before, and it worked intuitively. Might just be a poor translation of the buttons labels and manuals from whatever language was used to develop it. I really wanted it to work.

I could not be happier with this wonderful little gadget. It's quite a comicated little thing with more functions than you realize. It's fantastic and helped me get down to the cause of my problem very quickly. Buy it, you will be happy you did