31
Using the EARTH and EXGRD Keys
.
Chassis ground
Internal guard shield
NORMAL LO
signal ground
NORMAL LO
binding
post
Safety ground
through
ac line cord
Lit = open
Not lit = open
EARTH
EXGRD
GUARD
binding
post
oe15f.eps
Earth
The 5520A Calibrator front panel NORMAL LO
terminal is normally isolated from earth (chassis)
ground. When it is desired to make a connection
between the NORMAL LO terminal and earth
ground, press the Z key, lighting the key
indicator.
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