Burden Resistance/Measuring Resistance

Hello, I want to use a voltage sensors for a closed loop operation of a dc/dc converter. The sensed voltage will be given to the ADC of a micro-controller. The output of the sensor will be a current (10mA- 25mA), so in order to convert to voltage I will have to put a burden resistor/measurement rersistor. Now the range of this resistor as mentioned in datasheet of the voltage sensor is given as 100 ohms to 300 ohms.
SO I have two options, either I can put a fixed resistance or a trimmer resistance(variable resistance). Trimmer resistance is better because I can adjust it later to get optimum value. But the problem is the available Trimmer resistance have higher tolerance values of around 10% compared to 0.5%-1% of that of fixed one. Will the tolearnce be a proble. Please explain.
Here is the schematic of closed loop (not exactly my project)




Here is the functional diagram of voltage sensor:


Also, see the attached datasheet of the voltage sensors.

As it's adjustable why would you imagine tolerance would be a problem?.

However, with a fixed resistor you simply adjust in the software.

Nigel Goodwin said:

However, with a fixed resistor you simply adjust in the software.

Click to expand...

Thankyou. This is what I thought.