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What does the symbol mean?

Hi,

I have a function generator Agilent 33250A,
upload_2015-3-27_15-27-14.png
On it output port, it has a symbol like shown below.
upload_2015-3-27_15-27-54.png
What does it mean?
The function generator has an inner circuit like
upload_2015-3-27_15-29-57.png,
The shield is connected to the ground through a resistor and a capacitor, but I really don't see there is any relation with 42Vpk.
Also in my Agilent 6614C
upload_2015-3-27_15-32-33.png
there is a symbol
upload_2015-3-27_15-33-25.png
Could anyone tell me what does it mean?

Thanks.
 

hevans1944

Hop - AC8NS
The symbol on the 33250A means the shield of the BNC is not connected to Earth ground, but will tolerate up to 42 V peak voltage between the shield and Earth ground.
The symbol on the 6614C means the power supply outputs are not connected to Earth ground, but can be "floated" ±240 VDC with respect to Earth ground without damage to the power supply. Handy for stacking multiple power supply outputs.
 
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