Campbell AVW1 Manual de usuario descargar pdf (Pagina 8)

CR10 and VW Sensors, 2002/12/18 6

Check for Reading Quality

Instruction 131 Only

Instruction 131 instruction returns two frequency values in

consecutive locations. The first value, Freq_1, is produced from

the full number of cycles. The second value, Freq_2, is produced

from the first 20% of the full number of cycles.

The deviation between the two frequencies is a measure of read-

ing quality. Deviation is defined as:

The maximum allowable deviation for each sweep range is

shown in the table below. If the deviation is less than the maxi-

mum, the Freq_1 value can be accepted as a good reading. If the

deviation is greater, the reading should be taken again. (Always

provide a delay of at least two seconds before repeating a read-

ing).

Sweep Range Maximum Allowable Deviation

10.008

20.008

30.0032

40.0016

Deviation ABS 1

Freq_2

Freq_1

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Campbell AVW1 Manual de usuario Pagina 8