Agilent Technologies PHD-4 User Manual page 52

5 Technical Information
User Interface
The functions of the 4 soft-keys during the operating phases
(measurement screen page ) are as follows:
Key 1: (ZERO)
Key 2: ( ).
Key 3: (OFF)
Key 4: (MENU)
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Fixed /automatic zero
Backlight ON/OFF
PHD-4 OFF
Link to the “Desktop menu”.
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PHD-4 Portable Helium Detector User Manual / 87-900-120-01 (F )
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