Model 2657A High Power System SourceMeter® Instrument Reference Manual
Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012
7-3
Time and date values
Time and date values are represented as the number of seconds since some base. Representing
time as a number of seconds is referred to as “standard time format.” There are three time bases:
•
UTC 12:00 am Jan 1, 1970.
Some examples of UTC time are reading buffer base timestamps,
adjustment dates, and the value returned by
os.time()
.
•
Instrument on.
References time to when the instrument was turned on. The value returned by
os.clock()
is referenced to the turn-on time.
•
Event.
Time referenced to an event, such as the first reading stored in a reading buffer.
Remote versus local state
The Model 2657A can be in either the local state or the remote state. When in the local state (REM
indicator off), the instrument is operated using the front panel controls. When in the remote state
(REM indicator on), instrument operation is being controlled by the computer. When the instrument is
powered on, it will be in the local state.
Remote state
The following actions place the instrument in the remote state:
•
Sending a command from the computer to the instrument.
•
Running a script (FACTORY or USER test) from the front panel. After the test has completed, the
instrument will return to the local mode.
•
Opening communications between the instrument and Test Script Builder.
While in the remote state, front panel controls are disabled. However, the LOCAL key is active if it
has not been locked out. When an interactive script is running, the front panel controls are active,
which allows the operator to input parameter values.
The OUTPUT ON/OFF control is always active. If it is pressed when the instrument is in the remote
state, the instrument turns the output off (if it is on) and returns to the local state.
Local state
The following actions cancel the remote state and return the instrument to the local state:
•
Cycling power for the instrument.
•
Pressing the OUTPUT ON/OFF control.
•
Pressing front panel LOCAL key (if it is not locked out).
•
Sending the
abort
command from the computer.
•
Clicking the Abort Execution icon on the toolbar of the Instrument Console for Test Script Builder.
•
After a front panel script (FACTORY or USER test) has completed, the instrument will return to
the local state.
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