HP 5890 SERIES II Service Manual page 64

19. If the system is leak- free, replace the cover and panels and restore power to the instrument.
Check that the EFS is operational by displaying the flow rate for each channel (" A"and " B" ) on
the display board and also verify the value with a bubble flow meter. It is suggested that the
flow rate through each channel be different, in order to verify that the plumbing for the two
channels has not been " cross- connected."
20. If a flow rate value for either channel is displayed which does not correspond to the value ob-
tained using a bubble flow meter, leak- test the entire system. If the system is completely
leak- free, the EFS may require calibration.
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