Agilent Technologies Helium Leak Detector
DRAFT 12/11/17
119
Filament Switches between Filament 1 and 2. The filament selection can be
performed manually, but occurs automatically if the current operat
-
ing filament burns out. A calibration routine is recommended every
time the operating filament is changed.
The change appears on the Home and System Information screens
and C flashes on the Home screen to indicate that calibration is
required.
Gain Displays the current value of the Gain of the system. Gain is used
to scale the indicated value of a known leak to agree with a known
correct value. The gain parameter is adjusted after the leak detector
has been tuned to helium. It is automatically set by the Calibrate
Procedure.
NOTE Changing Gain changes Zero by the same percentage, which
can affect system transfer points.
Typical gain values range from 0.5 to 3.0. The higher the gain,
the more noise shows up in the least sensitive range.
To change a Gain parameter:
1. Press the numerical Gain value.
The numerical value has a grayed out/dimmed appearance.
NOTE For all tuning parameters, press Cancel to revert back to the
original value or press Done to initiate/store the desired value.
2. Press the Up or Down arrow to peak the helium signal.
3. Press Done to accept the changes and to store the new parameter value in the leak
detector memory.
4. Press OK to exit the screen and return to the Home screen.
To manually tune the leak detector:
1. Place the system in TEST mode.
2. Navigate to the Calibration and turn the Read Internal Leak - On.
3. Write down the INTERNAL CALIBRATED LEAK value. This value is temperature
compensated.
4. Navigate to the Manual Tuning Menu and:
❑ Set the GAIN to 1.0.
❑ Set the EMISSION to between 0.600 and 0.6500.
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