Front Panel Operation
2-14
The V-Source of the Model 6517A can also be operated
above earth ground as shown in Figure 2-15. In this circuit,
the V-Source is floating 100V above ground. Thus, a shock
hazard (100V) exists between V-Source LO and chassis
ground. A shock hazard exists at a voltage level equal to or
greater than 30V rms. To avoid possible shock hazards, al-
ways surround exposed floating circuits and shields with a
safety shield as explained in paragraph 2.4.4 (Safety Shield).
200V
(R
1
= R
2
)
R
1
HI
100V
V
LO
+
-
R
2
6517A
Voltmeter
200V
R
1
200V
A
+
-
R
2
6517A
Ammeter
R
3
A. Voltage measurement
B. Current measurement
Figure 2-14
Floating measurements
WARNING
The maximum voltage (common-mode)
between electrometer LO and chassis
ground is 500V. The maximum voltage
between V-Source LO and earth (chas-
sis) ground is 750V. Exceeding these val-
ues may create a shock hazard.
WARNING
When floating input LO above 30V from
earth (chassis) ground, hazardous volt-
age will be present at the analog outputs
(PREAMP OUTPUT and 2V ANALOG
OUTPUT). Hazardous voltage may also
be present when the input voltage ex-
ceeds 30V in the volts function.
CAUTION
Connecting PREAMP OUTPUT, COM-
MON or 2V ANALOG OUTPUT to
earth (chassis) ground while floating the
input may damage the instrument.
100V
100k
Ω
6517A
V-Source
200V
HI
LO
100k
Ω
Figure 2-15
Floating V-source
