Campbell CR800 Spezifikationen PDF herunterladen (Seite 230)

Section 8. Processing and Math Instructions

To produce random integers in a given range, use this formula:

INT( ( upperbound - lowerbound + 1 ) * RND + lowerbound )

Here, upperbound is the highest number in the range, and lowerbound is the

lowest number in the range.

SatVP (Dest, Temp)

SatVP calculates saturation vapor pressure (over water Svpw) in kilopascals

from the air temperature (°C) and places it in the destination variable. The

algorithm for obtaining Svpw from air temperature (°C) is taken from: Lowe,

Paul R.: 1977, “An approximating polynomial for computation of saturation

vapor pressure,” J. Appl. Meteor, 16, 100-103.

Saturation vapor pressure over ice (Svpi) in kilopascals for a 0°C to -50°C

range can be obtained using SatVP and the relationship

Svpi = -.00486 + .85471 Svp + .2441 Svp

where Svpw is derived by SatVP. This relationship was derived by Campbell

Scientific from the equations for the Svpw and the Svpi given in Lowe’s paper.

Parameter

& Data Type

Enter

Dest

Variable in which to store saturation vapor pressure (kPa).

Temp

Variable containing air temperature (°C).

StrainCalc (Dest, Reps, Source, BrZero, BrConfig, GF, v)

Converts the output of a bridge measurement instruction to microstrain.

Syntax

StrainCalc (Dest, Reps, Source, BrZero, BrConfig, GF, v)

Remarks

Calculates microstrain, µ∈, from the appropriate formula for the bridge

configuration. All are electrically full bridges, the quarter bridge, half bridge

and full bridge strain gages refer to the number of active elements (i.e., strain

gages), 1,2, or 4 respectively.

Parameter

& Data Type

Enter

Dest

Variable in which to store the results from the strain.

Reps

Number of strains to calculate, Destination, source, and zero variables must

be dimensioned accordingly.

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Campbell CR800 Spezifikationen Seite 230