[Converting from mmHg to hPa]
mmHg
0
10
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 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)]
hPa
1200
C°
45
2.0
35
3.0
25
4.0
15
5.2
5
6.3
-5
7.6
-15
9.0
[Error table: With mmHg (15°C, 760mmHg as standard)]
mmHg
C°
45
35
25
15
5
-5
-15
20
30
560
573
693
707
827
840
960
973
1093
1107
1227
1240
1100
1013
-0.5
-2.6
0.4
-1.8
1.4
-0.9
2.4
-0.0
3.5
1.0
4.7
2.1
5.9
3.2
900
800
760
2.0
-1.3
-2.6
3.0
-0.4
-1.8
4.0
0.5
-0.9
5.2
1.5
0.0
6.3
2.5
1.0
7.6
3.7
2.1
9.0
4.9
3.2
40
50
60
587
600
613
720
733
747
853
867
880
987
1000
1013
1120
1133
1147
1253
1267
1280
900
800
700
-5.5
-8.0
-10.5
-4.7
-7.3
-9.9
-4.0
-6.6
-9.3
-3.1
-5.9
-8.6
-2.2
-5.1
-8.0
-1.3
-4.2
-7.2
-0.2
-3.3
-6.4
700
600
-4.6
-8.0
-3.9
-7.3
-3.1
-6.6
-2.2
-5.9
-1.3
-5.1
-0.3
-4.2
0.8
-3.3
Unit:hPa
70
80
90
627
640
653
760
773
787
893
907
920
1027
1040
1053
1160
1173
1187
1293
1307
1320
Unit:mm
600
500
-13.0
-15.5
-12.5
-15.1
-12.0
-14.6
-11.4
-14.2
-10.8
-13.7
-10.2
-13.1
-9.5
-12.6
Unit:mm
500
400
-11.3
-14.6
-10.8
-14.2
-10.2
-13.7
-9.6
-13.3
-8.9
-12.7
-8.2
-12.2
-7.4
-11.5
89