Keithley 2700, User Manual, Page: 201 / 500

6-4 Buffer Model 2700 Multimeter/Switch System User’s Manual
Timestamps
Each stored reading is referenced to either a real-time clock timestamp or to a relative
timestamp.
Relative timestamp — With relative selected, there are two timestamp types for each
reading: absolute and delta. The absolute timestamp (S) references each stored reading to
zero seconds. Therefore, the first reading in the buffer has an absolute timestamp of zero
seconds. The delta timestamp (dS) indicates the time (in seconds) between the displayed
reading and the reading before it. The resolution for each timestamp is 0.001 sec.
NOTE With auto clear disabled and the relative timestamp selected, every stored
reading is referenced to the first reading (#0), even if the buffer is stopped and
started again. For example, assume you stored 10 readings in the buffer, and one
hour later, you store 10 more readings. The timestamps for all 20 readings are
referenced to the first reading. Therefore, the timestamp for the 11th reading
(#10) is one hour (3600 seconds).
When the Model 2700 is turned off, the relative timestamp resets to 0 sec when
the instrument is turned back on. If you have readings stored in the buffer and
auto clear is disabled when the unit is turned off, subsequent stored readings
will be appended to the old group of readings. However, the relative timestamps
for the new readings will be referenced to 0 sec.
When recalling stored readings from the front panel, both absolute and delta
timestamps are provided. For remote operation, the absolute or delta timestamp
is returned with each buffer reading. The TRACe:TSTamp:FORMat command
selects the relative timestamp type (
Table 6-1 ).
Real-time clock timestamp — With the real-time clock selected, each stored reading is
timestamped with the time and date. For the time, the seconds reading has 0.01 sec
resolution.