2-12
Measurement Concepts
Figure 2-9 shows two examples where Model 6514 floats at a hazardous voltage level. In Fig-
ure 2-9A, a shock hazard (100V) exists between meter input LO and chassis ground. If meter
input LO is connected to a noise shield, then the shock hazard will also be present on that shield.
In Figure 2-9B, a shock hazard (200V) exists between the meter input (HI and LO) and chas-
sis ground. If meter LO is connected to a shield, then the shock hazard will also be present on
that shield.
WARNING
The maximum voltage (common-mode) between electrometer LO and chas-
sis ground is 500V. Exceeding this value may create a shock hazard.
WARNING
When floating input LO above 30V from earth (chassis) ground, hazardous
voltage will be present at the analog outputs (PREAMP OUT and 2V
ANALOG OUTPUT). Hazardous voltage may also be present when the
input voltage exceeds 30V in the Volts function.
CAUTION
Connecting PREAMP OUT, COMMON or 2V ANALOG OUTPUT to
earth (chassis) ground while floating the input may damage the instrument.
200V
(R
1
= R
2
)
R
1
HI
100V
V
LO
+
-
R
2
6514
Voltmeter
200V
R
1
200V
A
+
-
R
2
6514
Ammeter
R
3
A. Voltage measurement
B. Current measurement
HI
LO
Figure 2-9
Floating measurements
Summary of Contents for 6514
Page 203: ...14 CommonCommands...
Page 207: ...15 SCPISignalOriented MeasurementCommands...
Page 235: ...18 PerformanceVerification...
Page 254: ...19 Calibration...
Page 274: ...20 RoutineMaintenance...
Page 278: ...A Specifications...
Page 282: ...B StatusandErrorMessages...
Page 288: ...C GeneralMeasurement Considerations...
Page 294: ...D DDCEmulationCommands...
Page 299: ...E ExamplePrograms...
Page 306: ...F IEEE 488BusOverview...
Page 320: ...G IEEE 488andSCPI ConformanceInformation...
Page 324: ...H CalibrationOptions...