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1620A "DewK" Thermo-hygrometer
User's Guide
136
[
ΔHSL
= −
×
25
%
' =
+ Δ
HSL
HSL
HSL
5. Calculate the slope-adjusted humidity errors:
' =
RHerror RHn
(
)
6. Calculate the median slope-adjusted humidity error, the adjustment
ΔHOS to the humidity offset parameter HOS, and the new humidity off-
set parameter:
[
RHerror RH
' =
RHmedian
ΔHOS
= −
RHmedian
' =
+ Δ
HOS
HOS
HOS
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.
−
RHerror RH
(
3
)
RHerror RH
−
(
RH
3
RH
1
)
+
Δ
RHerror RHn
(
)
HSL
'+
(
3
)
RHerror RH
2
'
(
1
)]
−
(
RHn
45
%)
×
25
%
'
(
2
) ]
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