Tektronix Keithley 6517B, Руководство пользователя

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Model 6517B Electrometer User's Manual Section 3: Connections
6517B-900-01 Rev. B August 2022 3-11
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 21: Floating measurements - current measurement
Floating voltage source
The voltage source of the 6517B can be operated above earth ground, as shown in the following
figure. In this circuit, the voltage source is floating 100 V above ground. Therefore, a shock hazard
(100 V) exists between voltage 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 common-mode voltage 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 that could cause injury or death. When floating input
LO above 30 V from earth ground, hazardous voltage is present at the analog outputs
(PREAMP OUT and 2V OUT). Hazardous voltage may also be present when the input voltage
exceeds 30 V when the voltage function is active.
Connecting PREAMP OUTPUT, COMMON, or 2V ANALOG OUTPUT to earth (chassis) ground
while floating the input may damage the instrument.