Calibrator/Source Operation - Keithley 263 Instruction Manual

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Figure 2-2. Model 263 Rear Panel
OUTPUT The source output high is available at this trim
connector. Source low may also be available here or at the
COMMON terminal depending on the configuration of
the output.
EXT INPUT This banana plug is used to connect an ex-
ternal supply (up to +200mA) to the Model 263. This ex-
ternal supply is then available at the output of the Model
263 when VOLTS EXT is selected.
COMMON Source output low is always available at this
terminal regardless of the configuration of the output.
PREAM,P OUT This terminal along with the COMMON
terminal can be used to monitor the voltage drop across
a load when the instrument is sourcing current or charge.
This terminal can also be used as an external guard source
when sourcing AMPS or COUL. PREAMP OUT is inoper-
ative in AMPS V/R, COUL V/R, VOLTS, and OHMS.
CALIBRATION Switch Permanent calibration of the
Model 263 can only be done if the CALIBRATION switch
is in the ENABLED position.
IEEE CONNECTOR This connector is used to connect
the instrument to the IEEE-488 bus. IEEE interface func-
tions are marked above the connector.
LINE VOLTAGE This switch is used to match the in-
strument to the available line voltage.
LINE FUSE The line fuse provides protection for the AC
power line input. The fuse rating must match the line
voltage setting.
AC RECEPTACLE Power is applied through the sup-
plied power cord to the 3-terminal AC receptacle.
2.4 CALIBRATOR/SOURCE OPERATION
The following paragraphs will take you through a simple,
general, step-by-step procedure to source resistance,
voltage, current or charge. The Model 263 can be used to
calibrate electrometers and picoammeters, or as a preci-
sion source to a load. The following procedure uses a four-
function electrometer (Keithley Model 617) to demonstrate
operation. However, any suitable load or electrometer can
be used instead. Using a four-function electrometer for this
demonstration simplifies the procedure and allows the
user to measure the actual output of the Model 263. If a
suitable electrometer is not available at this time, perfor-
ming the procedure with an open output will still have
instructional benefit.
2-4