PSM3750 Quick User Guide
Page 30
7.3
MEASUREMENT OPTIONS
7.4 ACQU
–
Acquisition Options
PSM3750 comes in either a 2 or 3 channel version. The 3 channel version can be
set to display just 2 channels if the third channel is not in use.
In normal acquisition mode, the window over which the measurements are
computed is adjusted to give an integral number of cycles of the input
waveform. The results from each window are passed through a digital filter
equivalent to a first order RC low pass filter.
There are 5 pre-set speed options
that adjust the nominal size of the
window, and therefore the update
rate and the time constant of the
filter. Greater stability is obtained at
the slower speed at the expense of a
slower update rate.
There is also an option to set a
specific size of the window to a value
other than the 5 pre-set options. In
order to synchronise to an integral
number of cycles the window size is
either reduced by up to 25% or
increased as necessary.
Speed
Update Rate
Very Slow
10s
Slow
2.5s
Medium
0.333s
Fast
0.083s
Very Fast
0.02s
Window
Manually input
window size for
data update