Thermoworks 9009-B INDUSTRIAL DUAL-BLOCK CALIBRATOR Manual do Utilizador descarregar pdf (Página 42)

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100

beta

apha x y

delta

rzero

alph

=+−−

( )()()()() ( ax y)( )( )

Where:

t and r are the measured resistance at –15°C.

alpha, rzero, and delta are the new values of ALPHA, R0, and DELTA calcu

lated above.

Program the new values for DELTA (delta), R0 (rzero), ALPHA (alpha) and

BETA (cold side only) into the calibrator with the following steps.

1. Press the “SET” and “EXIT” keys at the same time and then press

“SET” until R0 is displayed.

2. Press “SET” then use the “UP” or “DOWN” keys until the correct nu-

merical setting is displayed. Press “SET” to accept the new value.

3. Repeat step 2 for ALPHA, DELTA, and BETA (cold side only).

10.2.4 Accuracy & Repeatability

Check the accuracy of the calibrator at various points over the calibrated range.

If instrument does not pass specification at all set-points, repeat the Calibration

Procedure.

10 Calibration Procedure

Calibration Procedure

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Thermoworks 9009-B INDUSTRIAL DUAL-BLOCK CALIBRATOR Manual do Utilizador Página 42