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Model 6517B Electrometer Reference Manual
TIMESTAMP
A time stamp is included with each buffer reading if it is selected as a data element (see
ELEMENTS). This menu selection is used to check and change the time stamp type and format.
TYPE: This menu item is used to check and change the time stamp type. Note that changing the time
stamp type clears the buffer.
RELATIVE-TIME: With this selection, time stamps are oriented to a timer with the first buffer
reading time stamped at 0.000000 seconds. Each following time stamp is then based on the
currently selected format (see FORMAT). With the ABSOLUTE format selected, the time stamp
for each reading is referenced (in seconds) to the first buffer reading. With the DELTA format
selected, each time stamp is referenced (in seconds) to the previous time stamp.
REAL-TIME: With this selection, time stamps are oriented to the real-time clock and are based on
the currently selected format (see FORMAT). With the ABSOLUTE format selected, each reading
is simply time stamped with the actual time and date. Time can be expressed in the 12-hour (AM,
PM) format or the 24-hour format.
With the DELTA format selected, the first buffer reading is time stamped at 00000d 00h 00m 00.00s
(zero days, hours, minutes and seconds). Each subsequent time stamp is referenced (in days, hours,
minutes and seconds) to the previous time stamp.
Time stamp type for buffer readings is coupled to time stamp type for bus readings. Thus, if you
change time stamp type from this menu structure, it also changes in the MAIN MENU structure.
FORMAT: This menu item is used to check and change the time stamp format. Note that if format is
changed after readings are stored in the buffer, the time stamps change to reflect the alternate
format.
ABSOLUTE: With this selection, each time stamp provides the time and date that the reading was
taken (see REAL-TIME time stamp type), or the number of seconds from the first buffer reading that
the reading was taken (see RELATIVE-TIME time stamp type).
DELTA: With this selection, each time stamp is referenced to the time stamp for the previous reading.
This provides the time between buffer readings. Time stamps are provided in days, hours, minutes
and seconds (see REAL-TIME time stamp type) or in seconds (see RELATIVE-TIME time stamp
type).
6517B-901-01 Rev. C / August 2015
Section 8: Buffer (data store)
8-5
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