I am a junior engineer who works with testing and designing inverters for motors. I have been looking at a new oscilloscope since the one I had gave up. There are a lot of Tektronix TPS2024b being used since it has dedicated isolated channels on it. I was not sure how isolated channels worked to begin with but I now understand their usefulness. It is very handy to have a scope being able to do the same measurements as a multimeter without making mistakes, but also very nice to be able to avoid long paths to ground for more precise measurements.
So I decided an isolated scope that can measure high and low voltages well would be a a good choice for me, especially since differential probes sometimes can cost quite a bit, and adding that to the cost of the oscilloscope it quickly takes off.
So I started looking and it seems it is quite unusual, very unusual in fact. So I thought it would be a good idea to ask here to see if you can tell me what I am missing. I have noticed that the bandwidth seems lower on the isolated scopes, but it is hard to draw any conclusions with so few alternatives to compare.
- Why are there so few bench oscilloscopes with dedicated isolated channels?
- Is it a design issue, a cost issue, a business issue or is it just better with differential probes?
Oscilloscopes I have found:
- Tektronix TPS2000 series (~15 year old design)
- Cleverscope CS448
- Handyscope HS6 DIFF
There are also some hand-held isolated oscilloscopes that I could add to the list but I have not written them down since I was not looking for a hand-held scope. USB scopes seem to me very good and like a no-brainer, if it is possible to get one.