Instructions

ΔHSL
RHerror RH RHerror RH
RH RH
=− ×
−
−
25
31
31
%
[() ()]
()
HSL HSL HSL′= +Δ
5. Calculate the slope-adjusted humidity errors:
RHerror RHn RHerror RHn HSL
RHn
() ()
(%)
%
′= + ×
−
Δ
45
25
6. Calculate the median slope-adjusted humidity error, the adjustment
ΔHOS to the humidity offset parameter HOS, and the new humidity off
-
set parameter:
RHmedian
RHerror RH RHerror RH
′=
′+ ′[() ()]32
2
ΔHOS RHmedian=− ′
HOS HOS HOS′= +Δ
7. Enter the new values for TOS (TOS
′
), TSL (TSL
′
), HOS (HOS
′
), and
HSL (HSL
′
) into the thermo-hygrometer. Also set the DATE to the cur-
rent date and set the DUE date for the next calibration. If a power-on
warning message is desired when the DUE date expires, set ALERT to
ON. Do not change the serial number. Press ENTER when prompted to
write the new values to the sensor.
1620A “DewK” Thermo-hygrometer
User’s Guide
136