What is the null point for calibrating an instrument in deep space?

[wolram]

How would one calibrate an instrument in deep space, the instrument must be set to a zero point and the instrument could be effected by any force.

 

[f95toli]

I think the question is a bit too general. You need to specify what type of instrument it is, what "any force" means and the desired accuracy.
There are two ways to calibrate an instrument: Measuring a known quantity (usually a secondary standard) or by directly comparing it to a primary standard.
Time, temperature, voltage and resistance are examples of quantities where you can quite easily make and measure a primary standard with reasonable accuracy. Calibrating a scale (weight) is much harder since you need an artifact.

 

[wolram]

I think the question is a bit too general. You need to specify what type of instrument it is, what "any force" means and the desired accuracy.
There are two ways to calibrate an instrument: Measuring a known quantity (usually a secondary standard) or by directly comparing it to a primary standard.
Time, temperature, voltage and resistance are examples of quantities where you can quite easily make and measure a primary standard with reasonable accuracy. Calibrating a scale (weight) is much harder since you need an artifact.

This harder than i thought, is there a way to find zero energy level, given that any of a range of instuments would be in deep space?

 

[wolram]

May be if i ask ,what is deemed to be a zero energy energy point?

Edit

Given that (i think some gravity will exisit).

 

[wolram]

If it was possible to screen off a volume of space from all outside influences, i guess there would still be energy in that volume, and as energy can be positive as well as negative (what would be the null point)?