Campbell-scientific CS11-L Current Transformer Manual do Utilizador descarregar pdf (Página 19)

CS11-L Current Transformer

samples 25 times, and the second CR200X example program has a loop that

samples 30 times. A 25-sample loop produces almost two cycles of a 60 Hz

waveform, and a 30-sample loop produces almost two cycles of a 50 Hz

waveform (see FIGURE 6-1). The average energy under the curve is

calculated using the RMSSpa instruction. A multiplier of 0.2 is applied to the

rms value; see Appendix A.4, Multiplier, for more information.

25 Samples of Amperage on CR200X Datalogger (60 Hz)

or 30 Samples of Amperage on CR200X Datalogger (50 Hz)

25 samples of Amperage on CR200 datalogge

-80

-60

-40

-20

135

7 9 11 13 15 17 19 21 23 25

Instanteneous Amps

CS11-L waveform

FIGURE 6-1. Graph of a CS11-L waveform

6.2.1 CR200(X) Program for 60 Hz

'CR200 Series Datalogger

' Program name: CS11-LManual60Hz.cr2

'date: Jun 2013

Const Samples = 25 ' 25 samples for 2 waves of 60 Hz.

'Const Samples = 30 ' 30 samples for 2 waves of 50 Hz.

Public Crnt_A

Public mV(Samples)

Dim Counter

DataTable (Amp,1,-1)

DataInterval (0,1,min)

Average (1,Crnt_A,False)

Maximum (1,Crnt_A,False,0)

EndTable

BeginProg

Scan (1,Sec)

ExciteV (Ex1,mV2500)

For Counter = 1 To Samples

VoltSe (mV(Counter),1,1,1.0,-1250)

ExciteV (Ex1,mV0)

RMSSpa (Crnt_A,(Samples-0),mV(1))

Crnt_A=Crnt_A*0.2 ' Multiplier for sensor

If Crnt_A<0.15 Then ' Eliminate noise below 0.15 amps.

Crnt_A = 0

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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