help on measure consideration of hysteresis comparator

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sunjiao3

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Dear all,
I encounter a problem now. Well, I designed a hysteresis comparator with the width of the hysteresis window being 84mv. And now, I wonder how I could measure it with enough precision, like 1 mv or so. While in fact, it is quite difficult.
Usually, rheostat is used to control the amplitude of input voltage. And the precisioin of rheostat and our feeling will vary a lot.
So, could any one of you give me some suggestions on the measure of such kind of comparator with so tiny width of hysteresis window?
Thank you in advance.
 

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