Vaisala PTU300 Uživatelská příručka stáhnout pdf (Strana 153)

Chapter 6 ___________________________________________________Calibration and adjustment

VAISALA ______________________________________________________________________ 151

CTA

4. Type C and press ENTER a few times to check if the reading is

stabilized. Let the reading stabilize, give the reference temperature

after the question mark and press ENTER three times.

When having another reference temperature (2-point calibration)

press ENTER only twice and insert the probe to the second

reference. When the reading is stabilized, give the second reference

temperature after the question mark and press ENTER. Please,

note that the difference between the two temperature references

must be at least 30 ºC.

Example (1-point adjustment):

>ct

T : 16.06 Ref1 ? c

T : 16.06 Ref1 ? 16.0

Press any key when ready ...

T : 16.06 Ref2 ?

5. OK indicates that the calibration has succeeded.Give the

calibration information (date and text) to the transmitter's memory,

see the serial commands CTEXT and CDATE.

6. Press the ADJ button on the motherboard to close the adjustment

mode.

7. Take the probe out of the reference conditions and replace the

filter.

Analog Output Adjustment (Ch1 and Ch2)

In the analog output calibration the analog output is forced to the

following values:

- current output: 2 mA and 18 mA

- voltage output: 10 % and 90 % of the range

Connect PTU300 to a calibrated current/voltage meter in order to

measure either current or voltage depending on the selected output type.

NOTE

Normally, analog output Ch3 does not need to be adjusted once it has

left from the factory. However, if accuracy of the unit is suspected, it is

advisable to return the unit to Vaisala for re-adjustment/calibration.

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Vaisala PTU300 Uživatelská příručka Strana 153