Timestamp is not accurate

[tiedjem]

Hi,

im my program i want to put a timestamp on every measured value, so I log after every acquisition the time with the "Get Date" function. The result was the timestamp has only a accuracy about 16ms, witch ist not admissible for my application. (see the picture of a simplified program).

My question is now:

Why has the timestamp / "getDate" such a miserable accuracy ?

How can work around this problem? I think there must be a way, because the "Tick Count" works quite well!

Thank you

M.Tiedje

[chrisger]

hi there

your systems has two clocks:

system clock: large range (years), but poor resolution
processor ticks: rather small range (2^32 ms ~ 50 days), but good resolution

you can mix both clocks: get the start of your measurement with "Get Date/Time in Seconds" and add the number of milliseconds since start of measurement (subtract "Tick Count (ms)" values).