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Model 6517B Electrometer Reference Manual
Operate
Hazardous voltages may be present on the output and guard terminals. To prevent
electrical shock that could cause injury or death, NEVER make or break connections to the
Model 6517B while the output is on. Power off the equipment from the front panel or
disconnect the main power cord from the rear of the Model 6517B before handling cables
connected to the outputs. Putting the equipment in standby mode does not guarantee that
the outputs are not powered if a hardware or software fault occurs.
The OPER key toggles the output between standby and operate. In standby, the voltage source is
removed from the rear panel output terminals. In operate (VOLTAGE SOURCE OPERATE indicator
on), the voltage source is applied to the output terminals.
A flashing VOLTAGE SOURCE OPERATE indicator denotes that the voltage source is in current
limit.
A relay switch, in series with OUTPUT HI, is opened when the voltage source is placed in standby.
The transition to an open output creates a potential for noise spikes. The open output allows
dielectric absorption to recharge capacitors to unexpected voltage levels.
Analog outputs
The Model 6517B has two analog outputs on the rear panel. The 2 V ANALOG OUTPUT provides a
scaled 0 V to 2 V output with the value of 2 V corresponding to full-range input. The PREAMP OUT is
especially useful in situations requiring buffering. These two analog outputs are discussed in the
following sections.
When floating input Low above 30 V RMS from earth ground, hazardous voltage is present at
the analog outputs. Hazardous voltage may also be present when the input voltage exceeds
30 V RMS in the volts function, or when input currents exceed 30 pA in the amps function.
Connecting PREAMP OUT, COMMON, or 2 V ANALOG OUTPUT to earth while floating the input
may damage the instrument.
6517B-901-01 Rev. C / August 2015
Section 5: Measurement options
5-7
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