29 Adjustment and Calibration
Pressure
The pressure transducer has no nonlinear drift so an adjustment is normally not necessary.
Use the tare function to balance the pressure transducers environmental pressure change drift.
The pressure channel is adjusted using 7 sampling points. This improves the accuracy of the pressure
measurement, because it recalculates slightly nonlinearities of the pressure transducer. The order of the
adjustment points starts with point 1 and is preassigned. The value range of each point is restricted by
boundaries.
Apply the pressure values to the instruments pressure transducer inlet as shown in the table below. Adjust the
value of your reference or standard to the HDM using the navigation keys and . It is mandatory
to wait until the measuring value becomes stable. After the measuring value finally becomes stable the
adjustment point can be applied using the navigation key . The instrument jumps immediately to the
next adjustment point, so the procedure can be repeated. After the last adjustment point has been applied the
instrument displays "ADJ OK" in the upper line of its display. If the adjustment is not correct, the instrument
displays "ADJ ERR" in the display along with a long warning beep. In this case the adjustment values will be
discarded and the procedure has to be started from the beginning. A failed adjustment can also be an
outcome of a defective instrument.
All HDM97 versions except BH.
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