We are in the process of evaluating different manufacturers equipment that will perform the above measurements. So far the units that we have reviewed were a bit excessive for our needs. 

We currently have a Tektronic Model 1502C which we are using for controlled impedance measurements and like how this unit operates 
(user friendly).

We are hoping to find a piece of equipment that performs differential impedance measurements that is equally easy to use and are curious on what other shops are using and/or what they may reccomend.

Any suggestions ?

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