Specifications

8-4 WINDOWING Windowing is a frequency filter that we apply to the frequency-domain
data when we convert it to time-domain data. This filtering rolls off
the abrupt transition at F1 and F2. This effectively produces a
time-domain response with lower sidelobes. Windowing allows a
limited degree of control over the pulse shape, trading off ringing
(sidelobes) for pulse width (Figure 8-15).
We select windowing from the Time Domain Setup soft-key menu.
Four different windows are available: RECTANGLE, NOMINAL,
LOW SIDELOBE, and MINIMUM SIDELOBE. The RECTANGLE
option provides the narrowest pulse width, while the MINIMUM
SIDELOBE option provides the least ringing (fewest sidelobes). The
MS462XX defaults to the NOMINAL option, which is acceptable for
most measurements. Windowing menus are shown in Figure 8-16.
WINDOWING TIME
DOMAIN
8-12 MS462XX OM
FREQUENCY DOMAIN TIME DOMAIN
1-TERM WINDOW
2-TERM WINDOW
WINDOWING
F1
NOTE: Wider but no ringing
F2
Figure 8-15. Windowing
Figure 8-16. Window Shape Soft-Key Menus
LOWPASS TIME
DOMAIN SETUP
MARKER RANGE
WINDOW SHAPE
XXXXXXXXXXX
X
GATE SETUP
D.C. TERM
XXXXXXX
XXXXXXXXXXX
RETURN
LOWPASS TIME
DOMAIN SETUP
START
XXX.XXX ps
STOP
XXX.XXX ps
CENTER
XXX.XXX ps
RESPONSE
IMPULSE/STEP
MORE
WINDOW/GATE
SHAPE
RECTANGULAR
NOMINAL
LOW SIDELOBE
MIN SIDELOBE
HELP ON/OFF
RETURN