Section 3: Connections Model 6517B Electrometer Reference Manual
3-10 6517B-901-01 Rev. C / August 2015
Floating measurements
The figures below show two examples where the Model 6517B floats at a hazardous voltage level.
In the following figure, a shock hazard (100 V) exists between meter input LO and chassis ground. If
meter input LO is connected to a noise shield, the shock hazard is also present on that shield.
Figure 21: Floating measurements - voltage measurement
In the following figure, a shock hazard (200 V) exists between the meter input (HI and LO) and
chassis ground. If meter input LO is connected to a noise or guard shield, the shock hazard is also
present on that shield.
Figure 22: Floating measurements - current measurement
Floating voltage source
The V-source of the Model 6517B can also be operated above earth ground, as shown in the figure
below. In this circuit, the V-source is floating 100 V above ground. Therefore, a shock hazard (100 V)
exists between V-source LO and chassis ground. A shock hazard exists at a voltage level equal to or
greater than 30 V RMS. To avoid possible shock hazards, always surround exposed floating circuits
and shields with a safety shield (see Safety shield (on page 3-9) for more information).
The maximum voltage (common-mode) between electrometer LO and chassis ground is 500
V. The maximum voltage between V-source LO and earth (chassis) ground is 750 V.
Exceeding these values may create a shock hazard. When floating input LO above 30 V from
earth (chassis) ground, hazardous voltage is present at the analog outputs (PREAMP
OUTPUT and 2 V ANALOG OUTPUT). Hazardous voltage may also be present when the input
voltage exceeds 30 V in the volts function.
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