Vaisala PTB220 Series Guide de l'utilisateur télécharger pdf (Page 95)

APPENDIX E ___________________________________________________________ ANALOG OUTPUT

VAISALA _________________________________________________________________________ 89

1. Open the cover of the barometer and set the dip switch SW4 to

upward position (ON).

2. Use the serial line to give the command LC OFF, which deactivate

the linear correction.

3. Give the command ITEST X

and measure the output current /

voltage. X

is a value close to the lower end of full range, for

example, 0.5 in voltage or 5 in current output mode.

4. Give the command ITEST X

and measure the output

current/voltage. X

is a value close to the upper end of full range,

for example, 4.5 in voltage or 19 in current output mode.

5. Calculate the gain and offset corrections using following

equations. The parameters are in milliamperes or volts.

eas

ItestXItesX

Gain

−

(E-1)

11 MeasXGainItestXOffset ⋅−= (E-2)

6. The corrections are given with the command DLCI. Please note that

the programme requests the corrections for both analog modes.

Give the calculated factors only and acknowledge the values with

enter (<cr>). The parameters not to be changed can be passed with

enter (<cr>).

Example of calculating and giving the linear an offset/gain

corrections:

ItestX

= 0.5 V MeasX

= 0.502 V

ItestX

= 4.5 V MeasX

= 4.506 V

Offset = -0.001499

Gain = 0.999001

>dlci

U offset : ? -0.001499<cr>

U gain : ? 0.999001<cr>

I offset : ? <cr>

I gain : ? <cr>

CORRECTIONS SAVED

7. Activate the linear correction with the command LC ON and reset

the barometer.

8. The correction can be checked with command ITEST x, where x is

0...5V or 4...20mA.

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 112 113

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Vaisala PTB220 Series Guide de l'utilisateur Page 95

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