Vaisala HMW90 User Manual download pdf (Page 73)

Chapter 5 _______________________________________________________________ Maintenance

VAISALA ________________________________________________________________________ 71

Adjustment Using a PC

For more detailed instructions on using the Vaisala USB cable and a

terminal application, see section Connecting With a PC on page 38.

For a description of the serial commands, see section Calibration and

Adjustment Commands on page 58.

1. Connect the HMW90 series transmitter to your PC using the

Vaisala USB cable (order code 219690).

2. Start a terminal application and open a new session to the service

port of the transmitter. The serial line settings are 19200, N, 8, 1.

3. Before changing the adjustment, issue the following commands to

see the transmitter’s current adjustment information:

pass 9000

crh

ctext

cdate

4. Place the entire transmitter in the desired reference condition and

allow the measurement to stabilize. Follow the stabilization from

the serial line (output from the R command) or the display.

5. You can now use the CRH and CT commands to adjust the

transmitter’s RH and T measurement. Refer to the command

descriptions for the available options.

6. After performing the adjustment, verify from the serial line or the

display that the measurement has been corrected.

7. After completing the adjustments, you can enter a descriptive text

string in the transmitter’s memory using the CTEXT command,

and note the adjustment date using the CDATE command.

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 109 110

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Vaisala HMW90 User Manual Page 73