Pressure Systems 9022 Instrukcja Użytkownika Pobierz pdf (Strona 127)

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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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4.5.2 Calibration Procedure

The calibration procedures may be summarized as follows:

1. Set all 9021/9022 channels for the desired gain (1, 20, 45, or 90).

(9022 temperature voltage input gain is fixed at gain = 1)

2. Apply a known upscale or full scale voltage to the 9021/9022.

3. Measure the applied voltage through the 9021/9022.

4. Calculate the 9021/9022 measurement error as a ratio of applied voltage.

5. Adjust the current reference network coefficient by the observed measurement error ratio.

6. Store the new coefficients to non-volatile 9021/9022 memory.

The above process is repeated for each of the four (4) 9021/9022 gain settings (or selected gain

settings as needed for your application).

Calculation of the new reference coefficient is performed as follows:

CoefOld = current reference coefficient value

CoefNew = new/corrected coefficient value

Vapplied = actual applied test voltage

V9021 = reported voltage measured by the 9021/9022

CoefNew = CoefOld * [1 + (Vapplied - V9021) ÷ Vapplied]

Example:

CoefOld: 9021/9022 Gain=1 current reference coefficient is 0.9800

Vapplied: 4.004 VDC is applied to 9021/9022 channel 1 from a precision voltage

source

V9021: 9021/9022 reports 3.965 V measured at channel 1

CoefNew = 0.9800 * [1 + 4.004 - 3.965) ÷ 4.004]

CoefNew = 0.98955

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Pressure Systems 9022 Instrukcja Użytkownika Strona 127