INFICON Cube CDGsci User Manual
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tina88e1-b (2014-09)
The
• the signal output is negative (< -20 mV) when the final pres-
sure has been attained
• the zero adjustment has failed.
4.4.2
<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.
Zero adjustment using the ramp function can be
performed via
• the
• the diagnostic port (→ [3]),
• the RS232 interface (→ [2], [3]),
• the Ethernet interface (→ [1], [4]),
• the wireless network (→ [1], [4]).
Operate the gauge for at least 90 minutes under constant
ambient conditions (until the signal is stable).
Push the
keep it depressed. The
After 5 s, the zero adjustment value, starting at the current
output value, keeps continually changing (ramp) until the
button is released or until the setting limit (max. 25% F.S.)
is reached. The corresponding output signal is delayed by
about 1 s.