User manual

Model 6485 and 6487 User’s Manual Connections 2-7
Figure 2-7
Basic Model 6487 current measurement connections
t^okfkd If it is possible for the DUT or external supply to present more than 505V
to the input HI, it is imperative that the connection between input LO and
the external voltage source be sufficiently low impedance and capable of
carrying the short-circuit current of the source, in order that the LO not
exceed 505V.
`^rqflk Current limiting resistors are required for DUTs capable of forcing volt-
ages 505V or greater. Damage to the instrument may result if voltages
greater than 505V are forced on the Model 6487 INPUT HI.
Ohms measurement connections
Basic connections for ohms measurements are shown in Figure 2-8; the DUT is the resis-
tance to be measured. Circuit high is connected to the center conductor of the INPUT con-
nector and circuit low is connected to the V-SOURCE OUTPUT HI terminal. Note that
INPUT LO and V-SOURCE OUTPUT LO are connected together externally.
HI
LO
DUT
INPUT*
6487
* Maximum Continuous Input: 505V Peak