Campbell AVW1 Instrukcja Użytkownika Pobierz pdf (Strona 4)

CR10 and VW Sensors, 2002/12/18 2

Instruction 28

with AVW1 Interface

Instruction 28 1. Use instruction 28 to excite the sensor. It returns (kHz)

04 - Starting Freq (units = 100 Hz): Enter a frequency below

the lowest frequency in the test data on the calibration sheet

(e.g. 14 for 1400 Hz). See Sensors and Sweeps, page 5.

05 - End Freq (units = 100 Hz): Enter a frequency higher than

the highest frequency in the test data on the calibration sheet

(e.g. 35 for 3500 Hz). See Sensors and Sweeps, page 5.

06 - No. of Cycles: Enter 250 (typical). See Sensors and

Sweeps, page 5.

09 - Mult: Enter 1.0

10 - Offset: Enter 0

2. Use instruction 39 to obtain the square root of the reading

obtained with instruction 28. The value will now be kHz.

3. (Optional) Use instruction 55 to apply polynomial factors to

convert the readings to engineering units. The “manual ABC”

listed on the sensor calibration record are intended to operate

on Hz readings, so they must be adjusted for the kHz value

returned by instruction 39 above. See below.

04 - C0: Enter the C factor listed in the calibration record for

the C0 parameter. Do not modify this value.

05 - C1: Multiply the B factor by 1,000 (move the decimal

three places to the right) and enter the resulting value for the

C1 parameter.

06 - C2: Multiply the A factor by 1,000,000 (move the decimal

six places to the right) and enter the resulting value for the C2

parameter.

07 - C3: Enter 0.

08 - C4: Enter 0.

08 - C5: Enter 0.

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Campbell AVW1 Instrukcja Użytkownika Strona 4