Vaisala HUMICAP MMT162 Uživatelská příručka stáhnout pdf (Strana 61)

Chapter 6 ___________________________________________________ Calibration and Adjustment

VAISALA ________________________________________________________________________ 59

8. The adjustment mode starts. Automatic power off is disabled while

in adjustmend mode; press OK to acknowledge the message.

9. Select the parameter to calibrate and adjust (RH or T) from the list

and press Select. This procedure is applicable for both parameters,

but the following steps will assume you selected RH.

10. The adjustment mode should now show a stable, unchanging RH

value. The difference between the measured value and the

reference humidity should be no greater than the combined

measurement uncertainty of the MMT162 transmitter and the

reference environment. Depending on the result, proceed as

follows:

- If the MMT162 transmitter is within its accuracy

specification, there is no need to proceed with the adjustment.

Select Back and Exit to leave the adjustment mode.

- If adjustment is required, continue with the next step.

11. Press Adjust and select 1-point adjustment or 2-point

adjustment.

12. Press Ready and enter the correct value (the reference value) for

the parameter you are adjusting. Press OK when done, and YES

when asked if you really want to adjust.

13. You have now entered the first adjustment point. If you selected 1-

point adjustment, you will see the text Adjustment done. You

have now completed the 1-point adjustment. Select Back and Exit

to leave the adjustment mode.

If you are doing a 2-point adjustment, the indicator shows the

screen for the second reference point. Continue with the next step.

If something went wrong with the adjustment, check that your

reference environment fulfills the requirements listed in section

Adjustment Points on page 55, and that the measurement had

properly stabilized. Retry the adjustment after checking.

14. Transfer the MMT162 to the second reference environment (for

example, the NaCl (75 %RH) salt chamber).

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Vaisala HUMICAP MMT162 Uživatelská příručka Strana 61