Voltage Step Down Measurements Advice

[GreekoNiko]

I apologize if this question has been answered before but I cannot find any advice online.

My senior design group is trying to measure the voltage across a 3-phase electric motor that we expect to be around 48-50V. Our DAQ has a max operating voltage of 10.4V and after purchasing a cheap 100:1 transformer that did not work, we are not sure what the best method is for making this measurement. Most other transformers are more expensive than we think is necessary, and we don't want to waste any more money on cheap products that don't work. At most we are willing to spend ~$75 more of our budget on this measurement of possible. We do not have a very strong background in electrical engineering so we want avoid a system of resistors, capacitors, etc. 

We don't need much accuracy for the scope of this project +/- 5% is acceptable.  

[EnHernan]

Hi, can you give me more information about the device you are using? Also, what is the connection diagram you are using?

[GreekoNiko]

Thanks for the reply,

I am using a NI 9205 DAQ mounted on a CDAQ Chassis (but we might just switch to an Arduino if its easier since the DAQ is overkill anyways) 

There isn't really a wiring schematic we are simply connecting the test leads for a current transformer (outputs a small voltage) and would like to do the same for the voltage. 

The current transformer is working fine so far, but we do not know how to drop the ~50V down by a factor of at least 10 if not more. 

[EnHernan]

I think is best to make sure that you are getting the expected signal out of the transformer first. Once you are certain that you have the 10V output you can try to measure it on the DAQ. You have to take into account that if you are measuring an AC source that you have to use a differential input.  

[GreekoNiko]

I agree completely. Sorry if I wasn't clear, we have been able to test our current transformer and it outputs a voltage we can measure. However, we purchased a cheaper voltage transformer ( https://www.amazon.com/kuman-P4100-Universal-100-Oscilloscopes/dp/B019O9ACW8 ) and we found we could not get a reading from it when probed with a multimeter, so the transformer is definitely the issue. We're not sure if this is the wrong product for the job or if the 

Would you be able to recommend any products or suppliers that would be better? Or alternatives?