HP 3562A Operating Manual page 84

l"napter l-U8lng me Linear HeSOIUIIon IVloae
SELECTING WINDOWS
The Exponential Window
The exponential window attenuates the input signal at a decaying exponential rate determined
by the time constant you entered after pressing EXPON CHAN 1 or EXPON CHAN 2. The
general shape olthe exponential window is shown in figure 1·17.
If you have selected a frequency response measurement with the force window on one chan·
nel and the exponential on the other, the channel with the force window selection is multiplied
by both the force and the exponential window. Figure 1·18 shows the resulting function.
1·30
time
Figure 1·17 The Exponential Window
Figure 1·18 The Combined Force and Exponential Windows
1. Calculation used to create
window is e -th-
When value entered
1" =
after pressing EXPON
CHAN 1 or EXPON
CHAN 2 soft keys; t
is time record length.
1 . t determined by force window
on channel 1.
2. decay determined by
exponential window on
channel 2.
3. the exponential window is
stl!! applied to the mean
value leve! after the force window.
time