Atmospheric Correction; Hpa And Mmhg Conversion Table - Pentax R-2500DN Series Instruction Manual

Error Message
EDM ERROR
04 -05, 34-39, 50-53
ETH ERROR 70-76
MEMORY ERROR 19
ERROR PS DATA of EDM
ERROR P DATA of EDM
ERROR ETH DATA
System unready
Please restart

13.2 Atmospheric correction

The speed at which light travels through the air varies depending on the temperature and
atmospheric pressure. The R-2500DN is designed to measure distances at the speed of light in
order to measure accurately, atmospheric correction needs to be used. The instrument is
designed to correct for weather conditions automatically if the temperature and pressure are
input. Correction is then carried out based on the following formula.
Calculation formula
K= (276.26713 ‒ 273.14941 + t )
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
500 375 383
600 450 458
700 525 533
800 600 608
900 675 683
1000 750 758
1100 825 833
1200 900 908
88
Meaning
Distance measurement
system problem
Angle measurement system problem
Memory problem
Problem of the internal EDM
parameters
Problem of the internal ETH
parameters
Problem of when activating the
camera
78.565271・P
10
X
273.14941 + t
20 30
390 398 405
465 473 480
540 548 555
615 623 630
690 698 705
765 773 780
840 848 855
915 923 930
-4
40 50 60
413 420
488 495
563 570
638 645
713 720
788 795
863 870
938 945
What to do
Turn the power off,
and then turn on
again
Repair is needed
when the message
appears
consistently.
Unit:mmHg
70 80 90
428 435 443
503 510 518
578 585 593
653 660 668
728 735 743
803 810 818
878 885 893
953 960 968