Keysight E4990A Troubleshooting Manual page 11

Safety Symbols
10
General definitions of safety symbols used on the instrument or in
manuals are listed below.
Instruction Manual symbol: the product is marked with
this symbol when it is necessary for the user to refer to
the instrument manual.
Alternating current.
Direct current.
On (Supply).
Off (Supply).
In-position of push-button switch.
Out-position of push-button switch.
A chassis terminal; a connection to the instrument's
chassis, which includes all exposed metal structure.
Standby.
Impedance Analyzer