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CR10 and VW Sensors, 2002/12/18 3

Instruction 131

with AVW1 Interface

Instruction P131

Instruction 131 returns two values, a reading in Hz, and a

second value that can be used by the monitoring program to test

the quality of the reading. The instruction has 14 parameters.

Reps: Enter a 1. Do not use this instruction to obtain a second

reading. Instead, call instruction 131 a second time, after an

appropriate delay.

Range Option: Enter a 2 (or 1).

SE Channel: Choose an input channel.

Ex Channel: Choose an excitation channel.

Starting Freq (Hz): Enter a starting frequency for the excitation

sweep. See Sensors and Sweeps on page 5.

Ending Freq (Hz): Enter an ending frequency for the excitation

sweep. See Sensors and Sweeps on page 5.

T (Sweep, Units=ms): Enter the duration of the sweep in milli-

seconds. See Sensors and Sweeps on page 5.

N (no. of Steps): Enter the number of steps in the sweep fre-

quency. See the Sensor Table and Sweep Table for a value.

Delay after Excit. (Units=ms): Enter a delay of 25 milliseconds.

Cycles to Measure: Enter the number of cycles. See the Sensor

Table and Sweep Table for a value.

Rep Delay (Units = 0.01 sec): Enter zero.

Loc: Enter a label up to 9 characters long. PC208W then assigns

an input location. Behind the scenes, PC208 actually assigns two

input locations, one for the reading and the other for the com-

parison reading. Both readings are in Hz. The sample program

uses the label “Freq_1,” so PC208W automatically generates a

second label, “Freq_2.”

Mult: Enter 1.

Offset: Enter zero.

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Campbell AVW1 Manuale Utente Pagina 5