Campbell CR800 Especificações descarregar pdf (Página 213)

Section 8. Processing and Math Instructions

FIGURE 8-2. Effect of RH Errors on Calculated Dew Point (

5 RH Unit Error at Three Air

Temperatures)

Exp (Numeric Expression)

Returns e (the base of natural logarithms) raised to a power.

Syntax

x = Exp (source)

Remarks

If the value of the source exceeds 709.782712893, an Overflow error occurs.

The constant e is approximately 2.718282.

The Exp function complements the action of the Log function

and is sometimes referred to as the antilogarithm.

NOTE

Exp FunctionExample

The example uses Exp to calculate the value of e. Exp(1) is e raised to the

power of 1.

'Exp(x) is e ^x so Exp(1) is e ^1 or e.

Dim ValueOfE 'Declare variables.

BeginProg

ValueOfE = Exp(1) 'Calculate value of e.

EndProg

FFTSpa (Dest, N, Source, Tau, Units, Option)

The FFTSpa performs a Fast Fourier Transform on a time series of

measurements stored in an array and places the results in an array. It can also

perform an inverse FFT, generating a time series from the results of an FFT.

Depending on the output option chosen, the output can be: 0) The real and

imaginary parts of the FFT; 1) Amplitude spectrum. 2) Amplitude and Phase

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Campbell CR800 Especificações Página 213