3-11 Frequency Menu with Offset Function
Interference Analyzer (Option 25)
3-36
PN: 10580-00349 Rev. M
Spectrum Analyzer MG
Span Menu
Press the
Span
submenu key to access the Span menu, which is used to set the frequency
range over which the instrument will sweep. The span can be set from 10 Hz to the maximum
frequency of the instrument. The Span can also be set to zero span.
Key Sequence:
Freq
> Span
Span:
This submenu key shows the current value for span in units
of GHz, MHz, kHz, or Hz. When the Span button is pressed, span becomes
the active parameter and may be changed. Use the keypad, the directional
arrow keys, or the rotary knob to increase or decrease the span frequency.
If the span is changed by using the up and down arrow keys, the span
changes by the value of the Frequency Step entered in the
.
Span Up 1-2-5:
This is a convenient way to quickly arrive at a wider span
value. The first time the submenu key is pressed, the span value increases to
the nearest even value that starts with 1, 2, or 5. For example if the span is
1.8 MHz, pressing the submenu key for the first time changes the span to
2.0 MHz, the next press takes the value to 5.0 MHz and so on.
Span Down 1-2-5:
This is a convenient way to narrow the frequency span.
The first time the submenu key is pressed, the span value decreases to the
nearest even value that starts with 1, 2, or 5. For example if the span is
1.8 MHz, pressing the submenu key for the first time changes the span to
1.0 MHz, the next press takes the value to 500 kHz, then 200 kHz and so on.
Full Span:
Pressing this button sets the span to cover the entire frequency
range of the instrument.
Zero Span:
This submenu key sets zero span. In this mode the display
shows amplitude changes at a single frequency. This function is frequently
used to allow the easy monitoring of power variations over time. For example,
if information about the amplitude of an 802.11a access point signal is
needed, the access point frequency would be set as the center frequency,
resolution bandwidth would be set to a value wide enough to encompass as
much of the signal as possible and the tester would walk around the access
point usable area while the instrument records the amplitude using slow
sweep.
Zero Span (Option 89):
If Option 89 is installed on your instrument, press
the Zero Span key again (after the circle is red) to access the
IF BW Menu (Option 89)” on page 3-37
.
Last Span:
This submenu key returns the span to the most recent span
value immediately before a change was made.
Back:
Returns to the previous menu.
Figure 3-29.
IA Span Menu
Back
Span
Span
1.000 MHz
Span Up
1-2-5
Span Down
1-2-5
Full Span
Last Span
Zero Span
