Chapter 4 — Spectrum Analyzer 4-3 Making Spectrum Analyzer Measurements
MS20xxA VNA Master UG 10580-00166 Rev. C 4-3
8. Press the Scale soft key and use the Up/Down arrow keys or the keypad to enter the
desired scale. Press
Enter to set the scale.
Selecting a Signal Standard
Selecting a signal standard sets the center frequency, channel spacing, integration
bandwidth, and span for the first channel of the selected standard. For more information
about available signal standards, see Appendix A, “Signal Standards” which lists standards
in table format.
To select a signal standard:
1. Press the
Freq key to display the Frequency menu.
2. Press the
Signal Standard soft key and use the Up/Down arrow keys or the rotary knob to
highlight the desired signal standard. Press
Enter to select the highlighted signal
standard.
3. Press the
Channel# soft key to choose the required channel. By default, if a channel
number has not yet been entered, then the lowest channel number for that standard is
automatically selected. The channel numbers that can be selected correspond to the
channel numbering schemes of the various signal standards.
Setting Bandwidth Parameters
Both resolution bandwidth (RBW) and video bandwidth (VBW) can be automatically or
manually coupled to the frequency span. That is, the wider the span, the wider the RBW. The
ratio of the span width to the resolution bandwidth is 300:1 by default and, if necessary, can
be changed as follows:
1. Press the
BW key.
2. Select the
Span/RBW soft key. The current Span/RBW ratio is shown as part of the soft
key label. Change the value using the keypad, the directional arrows, or the rotary
knob.
When auto coupling between the span and the RBW is selected, it is indicated on the left side
of the display as
RBW XXX, where XXX is the bandwidth value. If manual RBW coupling is
selected, then a “#” symbol is shown in front of RBW on the left side of the display, and the
resolution bandwidth can be adjusted independently of the span. If a nonexistent resolution
bandwidth is entered, then the instrument selects the next higher resolution bandwidth. If a
value greater than the widest RBW is entered, then the widest RBW will be selected.
Note
Press the
Amplitude soft key and select Auto Atten coupling of the attenuator setting
and the reference level to help ensure that harmonics and spurs are not
introduced into the measurements. Refer to section “4-7 Attenuator Functions” on
page 4-6 for more information.
10580-00166C.book Page 3 Thursday, February 21, 2008 12:52 PM
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