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(3)
Common side of the measurement input
DC
OUTPUT
MONITOR
(Rear)
OUTPUT
When a very low level or distortion is measured,
a problem caused
by a ground loop can occur due to device interconnection.
To
avoid the problem, the common sides
( ^
)
are connected together,
and they are connected to the chassis
( 7J7-)
through a 10-ohm
resistor
(see Fig.
4-8).
So the common side
(
^
)
cannot be
voltage floated.
If an output terminal of a device with floating
voltage is connected to the INPUT A or B BNC connector directly,
the floating side of the device will be short-circuited to the
chassis through the 10-ohm resistor and may cause either damage to
the device under measurement or burning out of the 10-ohm resistor,
A11R25.
The floating connection is described in the following paragraph (4)
(4)
Connection between a device under test and the input connectors.
The measurement section of the VP-7721A provides two input BNC
connectors and a switch to select either floating or non-floating
input connection
(see Fig.
4-7).
The input signal path is changed
uy,
by the operation of the switch as illustrated in Fig.
4-9.
Cl
o
CM
O
I
CO
CO
o
4-23
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