7-10 Buffer (Data Store) Series 2600 System SourceMeters Reference Manual
2600S-901-01 Rev. A / May 2006 Return to Section 7 topics
Time and date values
All time and date values are represented as the number of seconds since the unit
was powered on. The os.clock() function returns values in this format.
Representing time as the number of seconds will be referred to as “standard time
format.” Note that because TSL numbers are floating point numbers, the precision
of time and date values relative to power-on will decrease the longer the unit is
powered on. This decrease in precision is approximately 0.06ppm of the total
elapsed time. This precision is generally much better than the time base of the
instrument and should not present any problems in practice. It is worth noting
because the user can directly see the affects as compared to the less obvious
time-base drift.
Buffer status
The buffer reading status attribute can include the status information as a numeric
value shown in
Table 7-7. To access status information, send the following
command:
stat_info = smua.nvbuffer1.statuses[2]
Table 7-7
Buffer status bits
Bit Name
Hex
value
Description
B0 TBD 0x01 Reserved for future use.
B1 Overtemp 0x02 Over temperature condition.
B2 AutoRangeMeas 0x04 Measure range was auto ranged.
B3 AutoRangeSrc 0x08 Source range was auto ranged.
B4 4Wire 0x10 4W (remote) sense mode enabled.
B5 Rel 0x20 Rel applied to reading.
B6 Compliance1 0x40 Source function in compliance.
B7 Filtered 0x80 Reading was filtered.
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