Filter
Top Products
Calibration Procedure
Temperature and Humidity Adjustments 7
7-5
that the measurement errors first be obtained according to the procedure above in section
Temperature and Humidity Measurement Errors. After the Temperature and Humidity
Adjustments procedure is completed, perform the Temperature and Humidity
Measurement Errors procedure again to verify the calibration.
1. Calculate the adjustment ∆TSL to the temperature slope parameter TSL, and the
new temperature slope parameter:
[]
()
13
)1()3(
10
TT
TTerrorTTerror
CTSL
−
−
×°−=∆
TSLTSLLTS ∆+=
′
2. Calculate the slope-adjusted temperature errors:
()
C
CTn
TSLTnTerrorTnTerror
°
°−
×∆+=
′
10
25
)()(
3. Calculate the median slope-adjusted temperature error, the adjustment ∆TOS to
the temperature offset parameter TOS, and the new temperature offset parameter:
() ()
2
23
′
+
′
=
′
TTerrorTTerror
nTmedia
4. Calculate the adjustment ∆HSL to the humidity slope parameter HSL, and the
new humidity slope parameter:
() ()
[]
()
13
23
%25
RHRH
RHRHerrorRHRHerror
HSL
−
−
×−=
HSLHSLLHS ∆+=
′
5. Calculate the slope-adjusted humidity errors:
() ()
()
%25
%45
Re
−
×∆+=
′
RHn
HSLRHnrrorHRHnRHerror
6. Calculate the median slope-adjusted humidity error, the adjustment ∆HOS to the
humidity offset parameter ∆HOS, and the new humidity offset parameter:
() ()
2
23
′
+
′
=
′
RHTHerrorRHRHerror
nRHmedia
nRHmediaHOS
′
−=∆
HOSHOSSHO ∆+=
′
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 current 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.