Hpa And Mmhg Conversion Table; Error When No Atmospheric Correction Is Made - Pentax R-200 Series Instruction Manual

designed to correct for weather conditions automatically if the temperature and pressure are
input. Correction is then carried out based on the following formula.
K: Atmospheric Correction Constant
P: Atmospheric pressure (hPa)
t: Temperature(°C)
Distance after Atmospheric Correction D = Ds (1+K)
Ds: Measured distance when no Atmospheric Correction is used.

13.3 hPa and mmHg Conversion Table

Converting from hPa to mmHg
hPa 0 10
mmHg mmHg
500 375 383
600 450 458
700 525 533
800 600 608
900 675 683
1000 750 758
1100 825 833
1200 900 908
Converting from mmHg to hPa
mmHg 0 10
hPa
400 533 547
500 667 680
600 800 813
700 933 947
800 1067 1080
900 1200 1213

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 1013 hPa or 760 mmHg), the Error per
100 meters in temperature and pressure will be shown in the tables below.
●When the actual pressure is 1013 hPa (760 mmHg) and the temperature is 25°C,
conducting the measurement with the temperature left at 15°C will result in the
measurement being short by 0.9 mm per 100 meters.
20 30
mmHg mmHg
390 398
465 473
540 548
615 623
690 698
765 773
840 848
915 923
20 30
hPa hPa hPa
560 573
693 707
827 840
960 973
1093 1107
1227 1240
40 50 60
mmHg mmHg mmHg
405 413 420
480 488 495
555 563 570
630 638 645
705 713 720
780 788 795
855 863 870
930 938 945
40 50 60
hPa hPa hPa
587 600 613
720 733 747
853 867 880
987 1000 1013
1120 1133 1147
1253 1267 1280
70 80 90
mmHg mmHg mmHg
428 435 443
503 510 518
578 585 593
653 660 668
728 735 743
803 810 818
878 885 893
953 960 968
70 80 90
hPa hPa hPa
627 640 653
760 773 787
893 907 920
1027 1040 1053
1160 1173 1187
1293 1307 1320
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