Keithley 6512, Instruction Manual, Page: 96 / 156

Performance Verification
5-6
11. For the remaining Model 6512 ranges, repeat steps 6
through 9 by sourcing the appropriate resistance to the
electrometer. Note that guard must be enabled on both
the Models 6512 and 263 when verifying the G
Ω
rang-
es. Also, note that COM of the Model 6512 must be con-
nected to COMMON of the Model 263 (see Figure 5-3).