Vaisala PTB210 SERIES Manuel d'instructions télécharger pdf (Page 47)

4.5.1 Instructions

In addition to BASIC syntax, additional intructions are included in CRBASIC to

facilitate measurements and store data like shown in in the previous example. The

following notes give an outline of the use of some instructions for operating the

instrumentation of the automatic weather station.

Port-Conﬁguration and Measurement Processing

First of all it is of great importance to deﬁne the ports on which the sensors should

work. A distinction is drawn between the analog sensors, whose signals are picked

oﬀ at the SE- and DIFF-Ports and the serial sensors whose data comes in at the

COM- and C-Ports of the data logger.

The analog sensors featuring diﬀerential measuremnts are picked oﬀ as following:

VoltDiff(Temp(1),2,mV2500,7,True,0,_50Hz,temp_multiplier,temp_offset)

This instruction measures the voltage diﬀerence between the high and low inputs of

a diﬀerential channel, starting at DIFF-Port 7, ending at DIFF-Port 8 because of

temperature array which includes two temperature measurements of two diﬀerernt

sensors. Both the high and low inputs must be within +/- 5 V of the data loggers

common range. By including its multiplier and oﬀset, the voltage output is converted

into the engineering unit °C at the same time.

However, there are also predeﬁned intructions for frequently used sensors with analog

output as for example Campbell Scientiﬁcs T107.

Therm107(T107_C(1),2,1,Vx1,0,_50Hz,1,0)

In this case two temperature readings at SE-Port 1 and 2 are done with an output

in °C.

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Vaisala PTB210 SERIES Manuel d'instructions Page 47