AVE VCR 322 PLUS Bedienerhandbuch PDF herunterladen (Seite 22)

tqna49e1 (2010-05)

After zero adjustment the gauge automatically returns to

measurement mode. The <RUN> LED lits.

The zero can also be adjusted via the RS232C interface

(→  [2]).

The <RUN> LED flashes if

• the signal output is negative (< -20 mV) when the final pres-

sure has been attained

• the zero adjustment has failed.

4.2.2 <ZERO> Adjustment with Ramp Function

The ramp function allows to adjust the zero at a known reference

pressure within the measurement range of the gauge.

It also permits to adjust an offset of the characteristic curve in

order to

• compensate for the offset of the measuring system or

• obtain a slightly positive zero for a 0 … 10 V AD converter.

The offset should not exceed 2% of the F.S. (+200 mV). At a

higher positive offset, the upper limit of the measurement range

is exceeded.

Recommended procedure for adjusting the offset of a

measuring system: → Notice  20.

n Operate the gauge for at least ¼ hour (until the signal is

stable).

o Push the <ZERO> button with a pin (max. ø1.1 mm) and

keep it depressed. The <RUN> LED starts flashing. After

5 s, the zero adjustment value, starting at the current out-

put value, keeps continually changing (ramp) until the but-

ton is released or until the setting limit (max. 25% F.S.) is

reached. The corresponding output signal is delayed by

about 1 s.

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AVE VCR 322 PLUS Bedienerhandbuch Seite 22