Owner`s manual

39
For example:
– If the grid is not shown, then the timebase
displayed on the monitor is the same as the
ProbeScope’s set sampling rate.
Since f= , if the time period of a recurrent
waveform is measured as
1ms
, the sam-
pling frequency is 1000 samples per second
(or ).
– If the grid is shown, then the displayed time-
base is the timebase of the grid. This time-
base is 10 times the normal sampling rate
(because there are 10 samples within each
division of the grid).
– You can change the timebase by pressing
the Select button, without first pressing the
Menu button.
• When measuring a waveform:
a.If the either the time or frequency is known,
simply calculate the reciprocal of the known
value to figure the unknown value.
b.Start with the smallest selectable timebase
on the ProbeScope (50 ns) and increase it
one step at a time (100 ns, 0.5 ms, 1 ms, 5
ms, 10 ms, 50 ms, 0.1 ms, 0.5 ms, or 1 ms)
until the displayed signal shows one or two
complete cycles of a waveform.
1ms 1kSa/s
Sampling
Frequency
Sampling
Rate
1
t
1
1 ms
10ms/div 1kSa/s
Sampling
Frequency
Timebase
22-310.fm Page 39 Friday, August 6, 1999 12:26 PM