2-6 Measurement Concepts and Connections Model 6487 Reference Manual
Voltage source connections
Basic connections for using the voltage source independently are shown in Figure 2-5; the
DUT is the load for the voltage source. DUT high is connected to V-SOURCE OUTPUT
HI and DUT LO is connected to V-SOURCE OUTPUT LO.
`^rqflk Do not connect external sources to the 6487 voltage source. External
sources may damage the 6487 voltage source.
Figure 2-5
Basic voltage source connections
Voltages greater than 505V
Occasionally, when making very high resistance measurements, it may be necessary to use
an external voltage source with voltages greater than the maximum tolerable input voltage
of 505V. In the event that the resistance to be measured becomes shorted or an incorrect
value of resistance is inserted in the test setup, the voltage source can permanently damage
the Model 6487. To prevent this damage, the following steps should be taken as a protec-
tion precaution.
To prevent accidental damage, a series resistor should be added to the test setup. The min-
imum value of this series resistor depends on the lowest current range to be used in the
measurement. If it will not be necessary to use the lower measurement ranges, a smaller
series resistor can be used, reducing the effect it will have on measurement accuracy. The
lowest necessary measurement range can be determined from the measurement range
accuracy specs, the applied voltage, and largest resistance desired to measure. If using
auto range, program the Model 6487 to not use its lowest ranges when autoranging.
HI
LO
DUT
LO
HI
V-Source
Output
6487
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