How to read an analog instrument during calibration

A

albna

#1
Hi everyone.

I have following questions regarding reading in an analog scale:
We have a high precision Dead weight tester that we can use as reference to calibrate our own pressure gauges in our lab. I want to calibrate a pressure gauge 0-200bar with a scale division of 10bar.

Supose I put weights in the tester to obtain a pressure of 50bar and the pointer at the gauge coincides very well with its mark for 50bar. I repeat the steps and the pointer comes again over the mark for 50bar just with differences equal or smaller than the width of the pointer. How should I report the readings: 50bar? (zero error ?).

The second case: If I repeat the reading and I can interpolate with my eyes following values: 52, 48, 50, 54, what I have to report as reading: 52, 48, 50, 54, or just 55, 45, 50, 55 according to the resolution of a half of division of the gauge?
 
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