F-2 Measurement Considerations
NOTE This appendix summarizes considerations to make safe, accurate measurements
using the Model 6430. For comprehensive information on these and additional mea-
surement considerations, refer to the Low Level Measurements handbook, which is
available from Keithley.
Floating measurement safety concerns
The Model 6430 can perform floating measurements up to 42V above chassis ground. Even
though 42V is not considered a lethal level, it is high enough to cause a shock.
Figure F-1 shows two examples where the Model 6430 floats at 40V above chassis ground.
Keep in mind the outer shells of the triax connectors on the Remote PreAmp are connected to
input/output LO. Therefore, 40V is present on those shells as well as the outer casings of the
triax cable(s). If meter LO is connected to a noise shield, then 40V will also be present on that
shield. Typically, a test circuit is enclosed in a test fixture that is connected to a safety earth
ground. The test connection drawings in Section 2 show how a test fixture should be used.
WARNING To prevent a shock hazard and possible damage to the Model 6430, never
exceed 42V peak between input/output LO and chassis ground.
WARNING To prevent injury from electric shock, DO NOT touch the triax cables (or
connectors) of the Remote PreAmp while the SourceMeter is turned on or
any external source is turned on.
80V
(R
1
= R
2
)
R
1
HI
40V
V
LO
+
-
R
2
6430
Voltmeter
40V
R
1
40V
A
+
-
R
2
6430
Ammeter
R
3
A. Voltage measurement
B. Current measurement
Figure F-1
Floating measurements
To Next Page
Loading...
Need help?
General
