7404-10 Operations Manual
Rev A 7/25/2014
Page 51 of 82
Temperature calibration (example)
If the chamber temperature display reads 40.0
C and the calibrated independent sensor
shows 40.3
C, set the temperature offset value to 0.3
C. If the calibrated independent
sensor shows 39.6
C, then the entered offset should be negative. In this example the
required offset to temperature would be -0.4
C.
Calibrating the Humidity
If humidity calibration is needed, the following steps can be taken:
Locate the reference instrument’s humidity sensor in close proximity to the cabinet’s
geometric center. Be sure that the stabilization times described earlier have been
satisfied prior to performing this calibration.
A positive value will move the humidity ‘up’ and a negative value ‘down’. Press the
‘home’ button and verify the proper humidity is displayed.
Humidity calibration (example)
If the chamber temperature display reads 80% and the calibrated independent sensor
shows 83%, set the humidity offset value to 3.0%. If the calibrated independent sensor
shows 74
C, then the entered offset should be negative. In this example the required
offset to humidity would be -6.0%.
Calibrating CO
2
If CO
2
calibration is needed, the following steps can be taken:
Locate the reference instrument’s CO
2 s
ensor in close proximity to the cabinet’s
geometric center. Be sure that the stabilization times described earlier have been
satisfied prior to performing this calibration.
A positive value will move the humidity ‘up’ and a negative value ‘down’. Press the
‘home’ button and verify the proper humidity is displayed.
