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CAUTION
1
"""
1
Non-floating connection as shown in Fig.
4-11 has a possibility of hazard.
Fig.
4-14 illustrates the interconnection between an amplifier and the
VP-7721A in non-floating arrangement.
Fig.
4-14
Non-floating interconnection
If the "Common" lead shown by dotted line in Fig.
4-14 is disconnect under
the condition that the amplifier gain A is large and the load RL is small
enough compared with 10 kilohms, the voltage appearing across 10 kQ
ti.e.
the voltage between the common side of the oscillator and the chassis)
will
have the value of Aeo.
Aeo can reach up to approximately power supply voltage of the amplifier
under measurement.
If it exceeds 10 volts,
the protective diodes are
activated and the current begins to flow through the fuses AlF_2 and A1F3.
The current exceeding 1 ampere will blow out the fuse
(s).
If the "Common" lead is connected correctly but the input common side is
connected to the chassis . (7J7-)
instead of BNC metal shell
^'^7 ^
-*-s
applied across RL and 10Q in series.
When Aeo.10/(RL+10)
exceeds 1.2 volts,
the 10S7 resistor, A11R25 will burn out.
Accordingly the following precautions should be observed for non-floating
input arrangement.
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