Pentax R-2500DN Series - Error When no Atmospheric Correction Is Made

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[Converting from mmHg to hPa]
Unit:hPa
mmHg 0 10 20 30 40 50 60 70 80 90
400 533 547 560 573 587 600 613 627 640 653
500 667 680 693 707 720 733 747 760 773 787
600 800 813 827 840 853 867 880 893 907 920
700 933 947 960 973 987 1000 1013 1027 1040 1053
800 1067 1080 1093 1107 1120 1133 1147 1160 1173 1187
900 1200 1213 1227 1240 1253 1267 1280 1293 1307 1320
13.4 Error when no atmospheric correction is made
When measurement is carried out with no atmospheric correction (with the settings fixed at a
temperature of 15°C and an atmospheric pressure of 1013hPa or 760mmHg), the error per 100
meters in temperature and pressure will be shown in the tables below.
• When the actual pressure is 1013hPa (760mmHg) and the temperature is 25°C, conducting
the measurement with the temperature left at 15°C will result in the measurement being
short by 0.9mm per 100 meters.
[Error table: When hPa (15°C, 1013hPa as standard)]
Unit:mm
C°

hPa
 1200 1100 1013 900 800 700 600 500
45 2.0 -0.5 -2.6 -5.5 -8.0 -10.5 -13.0 -15.5
35 3.0 0.4 -1.8 -4.7 -7.3 -9.9 -12.5 -15.1
25 4.0 1.4 -0.9 -4.0 -6.6 -9.3 -12.0 -14.6
15 5.2 2.4 -0.0 -3.1 -5.9 -8.6 -11.4 -14.2
5 6.3 3.5 1.0 -2.2 -5.1 -8.0 -10.8 -13.7
-5 7.6 4.7 2.1 -1.3 -4.2 -7.2 -10.2 -13.1
-15 9.0 5.9 3.2 -0.2 -3.3 -6.4 -9.5 -12.6
[Error table: With mmHg (15°C, 760mmHg as standard)]
Unit:mm
C° 
mmHg
 900 800 760 700 600 500 400
45 2.0 -1.3 -2.6 -4.6 -8.0 -11.3 -14.6
35 3.0 -0.4 -1.8 -3.9 -7.3 -10.8 -14.2
25 4.0 0.5 -0.9 -3.1 -6.6 -10.2 -13.7
15 5.2 1.5 0.0 -2.2 -5.9 -9.6 -13.3
5 6.3 2.5 1.0 -1.3 -5.1 -8.9 -12.7
-5 7.6 3.7 2.1 -0.3 -4.2 -8.2 -12.2
-15 9.0 4.9 3.2 0.8 -3.3 -7.4 -11.5