27-06-2008, 03:31 PM
Hej ærede forum
Jeg har lånt en Chronograf Shooting Chrono M1 og målte bla noget 30.06 ammunition.
30.06
1 808,7
2 810,8
3 799,8
Jeg læste så i manualen angående præcisionen for at vide lidt om hvad er måleusikkerhed og hvad er pga unøjagtighed i krudt eller seating ?
Der stod så følgende :
Accuracy: 99.5% or better. Displayed velocity will not differ from actual velocity by more than 1 part in 200, i.e., ±10 fps on a velocity reading of 2000 fps. Typical performance is generally better, and shot-to-shot repeatability is always more accurate, i.e., Reported Mean Instrumental Velocity may differ by as much as 0.5% from actual mean instrumental velocity, but Standard Deviation calculated from data gathered with a Chrony will always be closer than 0.5% to actual Standard Deviation for a string. This is an important fact because an accurate measurement of a load’s uniformity is of considerably more importance than is an exact measure of its average velocity.
Målenøjagtihed på 0,5% tro jeg jeg har fanget !
Men hvad F..... betyder resten ?
Er der en med forstand på statistik der kan forklare og evt vise ud fra de tre 30.06 målinger?
JBN
Have been there, have done it and have got the T-shirt.
Jeg har lånt en Chronograf Shooting Chrono M1 og målte bla noget 30.06 ammunition.
30.06
1 808,7
2 810,8
3 799,8
Jeg læste så i manualen angående præcisionen for at vide lidt om hvad er måleusikkerhed og hvad er pga unøjagtighed i krudt eller seating ?
Der stod så følgende :
Accuracy: 99.5% or better. Displayed velocity will not differ from actual velocity by more than 1 part in 200, i.e., ±10 fps on a velocity reading of 2000 fps. Typical performance is generally better, and shot-to-shot repeatability is always more accurate, i.e., Reported Mean Instrumental Velocity may differ by as much as 0.5% from actual mean instrumental velocity, but Standard Deviation calculated from data gathered with a Chrony will always be closer than 0.5% to actual Standard Deviation for a string. This is an important fact because an accurate measurement of a load’s uniformity is of considerably more importance than is an exact measure of its average velocity.
Målenøjagtihed på 0,5% tro jeg jeg har fanget !
Men hvad F..... betyder resten ?
Er der en med forstand på statistik der kan forklare og evt vise ud fra de tre 30.06 målinger?
JBN
Have been there, have done it and have got the T-shirt.