Table of Contents
Advertisement
Technical Information
Auto-Zero<0 Active
Auto-Zero < 0 Inactive
For High Pressure Test/Sniffing mode, de-activation (Inactive AZ<0) is highly
NOTE
recommended. Manual Zeroing produces a more desirable performance, thus
eliminating false leaks due to fluctuations in test port pressure while in test.
Agilent Helium Leak Detector User Manual
Adjusts the zero reference point automatically and
continually to the correct zero value when the helium
background level drops below the previously set zero
reference point. This feature ensures that the leak
detector maintains a correct balance value after a
previously zeroed background signal naturally cleans
up (background helium is pumped away).
When the Auto-Zero < 0 feature is in the process of re-
adjusting the zero reference point, the arrows located
on the left end of the bar graph illuminate. These
arrows indicate that the measured helium leak rate is
currently less than the minimum displayable value. The
arrows may flash briefly as the system recovers from a
leak indication and the displayable leak rate
approaches zero. If the Auto-Zero < 0 is turned on, the
arrows may also flash briefly as the system resets the
zero point to a lower value. The leak detector does not
display a leak rate while the arrows are on. If the
arrows remain on for more than a few seconds, press
Zero to set operating parameters to the correct zero
value. This situation can occur if the leak detector had
not been fully warmed up when a previous calibration
was initiated.
When Auto-Zero < 0 is inactive, the leak detector does
not automatically adjust the zero reference point when
the helium background level drops below the previously
set zero reference point. In this condition, a leak less
than the previously set zero value is not indicated by
the system. Instead, the arrows remain lit, indicating
that the background level is below the previously set
zero reference point. Press Zero on the front panel to
readjust the zero reference point manually. This clears
the lights.
81
Advertisement
Table of Contents
