Agilent Technologies G8610A Operation Manual page 56

Hold
Digital Leak Rate
Test Port Pressure
Leak Detector Status
Leak Detector
Condition
Setpoints Status Box
Zero
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Agilent Technologies Helium Leak Detector
Places the system in Hold (while in Test, press Test again to starts
Hold); keeps the test port under vacuum and does not vent. Use
Hold to keep the system under vacuum, while taking the leak
detector out of test. This is useful if you want to let the leak detector
clean up the helium background, while keeping the system under
vacuum.
Since the test port pressure gauge is located on the test port side of
the isolation valve, a subsequent rise in test pressure can be
observed while in this mode.
Correlates directly with the log and linear bar graph leak rate dis-
play. The units for the measurements are selected in the Settings >
Main Settings menu (see Section 6.1 "Settings Menu" on page 103).
Appears on the Home screen and represents the test port pressure
as measured by a thermocouple device mounted on the valve
block just below the test port. The pressure transducer and
associated electronics are intended to protect the leak detector
from damage due to over-pressure conditions. Use an external
pressure transducer if the test process requires a more accurate
monitoring of the test object pressure.
Appears below the test port pressure reading and indicates the cur-
rent leak detector operating state. The normal operating states are
detailed in Table 3-1 on page 58.
Appears below the Leak Detector Status and indicates the current
leak detector condition during abnormal conditions. See Table 3-2
on page 58 for a list of leak detector conditions.
Appears below the Leak Detector Condition on the left-hand center
of the Home screen when any of the four independent set points
are enabled and activated or de-activated.
Zeroes out the helium leak indicated on the display. The Zero but-
ton darkens while zeroing is taking place. The leak rate must be
less than 4.0E-7, while in Test, to allow a cross over to Fine Test.
The Zero button is only active while the leak detector is in the Test
and Fine Test states of operation.
The leak detector automatically subtracts the recorded background
signal to display only the real leak rate.