Section 3: Connections Model 6517B Electrometer Reference Manual
3-2 6517B-901-01 Rev. C / August 2015
Input configurations
The input connector can be configured with guard off or guard on.
With GUARD off, input low is connected to the inner shell of the connector, as shown in the following
figure. This configuration is used for current, resistance, coulombs and unguarded voltage
measurements.
Where possible, make input low connections directly to the INPUT connector low terminal instead of
using COMMON to avoid internal voltage drops that may affect measurement accuracy.
Figure 9: Input connector configuration - unguarded
With GUARD on, guard is connected to the inner shell of the triaxial connector, as shown in the
following figure. Input low is accessed through the COMMON connector on the rear panel. This
configuration is used for guarded voltage measurements only. Note that guard can only be enabled
(on) for the volts function. For ohms, amps and coulombs, guard is always disabled (off). For voltage
measurements, guard is enabled or disabled from the Configure Voltage menu structure.
The INPUT triaxial connector is also used for the force voltage measure current configuration. This
configuration uses the V-source to make resistance measurements and current measurements.
Figure 10: Input connector configuration - guarded
Maximum input levels
The maximum input levels to the Keithley Instruments Model 6517B Electrometer are summarized in
the figure below.
The maximum common-mode input voltage (the voltage between input low and chassis
ground) is 500 V
peak
. Exceeding this value may create a shock hazard.
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