Model 6517B Electrometer Reference Manual Section 2: Getting started
6517B-901-01 Rev. C / August 2015 2-3
8 VOLTAGE SOURCE OPERATE
 Indicator on when in operate, off when in standby.
9 OPTION CARD KEY
 Use to program and operate an installed option. Also used to scan external scanner
channels.
Rear panel summary
The rear panel of the Model 6517B is shown in the following figure. The descriptions of the rear panel
components follow.
Figure 2: Model 6517B rear panel
1 INPUT CONNECTOR
 Unguarded Configuration: Disable GUARD for amps, ohms, coulombs and unguarded volts
measurements
 Guarded Configuration: Enable GUARD for guarded volts measurements
2 PREAMP OUT
 Follows the signal amplitude applied to the INPUT terminal. With GUARD on, PREAMP OUT
is internally connected to the inner shell of the INPUT triaxial connector to configure the input
for guarded volts measurements. Referenced to COMMON. Rated at 200 V DC max. See
Preamp Out (on page 5-9) for more information.
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