Vaisala HUMICAP MMT162 Guía de usuario descargar pdf (Pagina 59)

Chapter 6 ___________________________________________________ Calibration and Adjustment

VAISALA ________________________________________________________________________ 57

4. Wait for 30 minutes for temperature and humidity to stabilize.

5. Turn on the MI70.

6. Select Display → Quantities and units from the menu of the

MI70, and verify that measurements from both ports (I and II)

are available. If the MMT162 is not detected, it may be because it

is already powered up and using non-default serial line settings.

Try the following steps:

a. Turn off the MI70.

b. Disconnect the cable from port I of the MMT162.

c. Turn on the MI70.

7. Select Functions → Adjustments (II) from the menu of the MI70

and press Start. Make sure the symbol for port II is shown after the

word "Adjustments", as your reference probe may also be

adjustable using the MI70.

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. Check and adjust the environment settings of the reference probe if

prompted by the MI70.

11. The adjustment mode now shows the value of the selected

parameter from both instruments, and a delta parameter (for

example, ΔRH) that shows the difference between the two. The

difference should be no greater than the combined measurement

uncertainty of the MMT162 transmitter and the reference probe.

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.

12. Select Adjust, and then select To same as RH (I).

13. The MI70 will ask Do you really want to adjust? Select Yes.

MI70 shows the text Adjustment done and returns to the

adjustment mode after a few seconds. Check the value of the delta

parameter to verify that the adjustment has taken effect.

14. Select Back to return to the parameter selection screen.

15. Select a new parameter for adjustment and proceed as instructed

above, or select Exit to leave the adjustment mode.

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Vaisala HUMICAP MMT162 Guía de usuario Pagina 59