Agilent Technologies G8610A Operation Manual page 90

❑
At the main screen, the system blinks the split flow symbol
ON.
❑
When split flow is turned ON, it displays the corrected leak rate but it knows the
real leak rate value.
❑
When ZERO is pressed with when split flow ON, the system zeros out background
up to a limit equal to the maximum split flow value.
To activate split flow:
1. Place the system into TEST mode and let the leak rate stabilize. Calibrate the system.
2. Press the Split Flow blue check button. The leak detector prompts you to enter the leak
rate for the customer's calibrated standard leak (what the leak rate should be).
The leak detector displays the corrected leak rate, essentially calculating a split flow
gain value. The leak detector automatically calculates the split flow factor, turns on and
calculates the range stop, based on the split flow factor.
When Split Flow is turned OFF, the system reverts back to the uncorrected leak rate.
This process must be repeated when reactivating split flow.
To setup:
1. Connect the leak detector and secondary rough pump to the test chamber as seen in
Figure 5-12.
2. Install the External Calibrated Leak on the test chamber.
3. Press Test on the leak detector.
4. Open valve on secondary rough pump to evacuate test chamber.
5. Select Test Configurations > Applications Setup and Figure 5-13 appears.
6. Select Split Flow and press Setup and Figure 5-13 appears.
90
Agilent Technologies Helium Leak Detector
The information icon provides the necessary directions for a suc-
cessful external calibration.
when split flow is