Keithley 2657A, Reference Manual, Page: 27 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2657A-901-01 Rev. B/December 2012 2-3
2. SMU setup, performance control, special operation, and numbers
SMU (source-measure unit) setup
SRC
Selects the source function (V or A) and places the cursor in the source field for editing.
MEAS
Cycles through measure functions (V, A,
Ω,
or W).
LIMIT
Places the cursor in the compliance limit field for editing. Also selects the limit value to edit (V, A,
or W).
MODE
Selects a meter mode (I-METER, V-METER, OHM-METER, or WATT-METER).
Performance control
DIGITS
Sets the display resolution (4½, 5½, or 6½ digits).
SPEED
Sets the measurement speed (FAST, MEDium, NORMAL, HI-ACCURACY, or OTHER). Setting
the speed selects either the fast or integrating A/D converter. When FAST is selected, the fast A/D
converter is used; any other selection (MEDium, NORMAL, HI-ACCURACY, or OTHER) selects
the integrating A/D converter. When the integrating A/D converter is selected, the measurement
speed and accuracy are set by controlling the measurement aperture. Also see
Speed (on page 2-
78).
REL
Controls relative measurements, which allows a baseline value to be subtracted from a reading.
FILTER
Enables or disables the digital filter. You can use this filter to reduce reading noise.
Special operation
LOAD
Loads test for execution (FACTORY, USER, or SCRIPTS).
RUN
Runs the last selected factory or user-defined test.
STORE
Accesses reading buffers and takes readings. TAKE_READINGS: Use to take readings and store
them in a reading buffer. SAVE: Use to save a reading buffer to nonvolatile memory or to a user-
installed flash drive (USB1) in CSV or XML format. Readings include measurements, source
values, and timestamp values, if configured.
RECALL
Recalls information (DATA or STATISTICS) stored in a reading buffer: DATA includes stored
readings, and if configured, source values and timestamp values; STATISTICS includes MEAN,
STD DEV, SAMPLE SIZE, MINIMUM, MAXIMUM, PK-PK.
TRIG
Triggers readings.
MENU
Accesses the main menu (on page 2-11). The main menu can be used to configure many
functions and features.
EXIT
Cancels the selection and returns to the previous menu or display. Also used as a LOCAL key to
take the instrument out of remote operation.
ENTER
Accepts the selection and moves to the next choice or exits the menu.
SRC MEAS LIMIT MODE
SPEED DIGITS FILTER REL
LOCAL
RUN LOAD RECALL STORE MENU TRIG ENTER EXIT