Using Offset Frequency; Setting The Span - Anritsu Field Master MS2070A Measurement Manual

Spectrum Analyzer Measurements

Using Offset Frequency

A user-defined frequency offset can be entered to adjust the frequency that is displayed on the instrument from
the actual swept frequency. For example, if the DUT is an antenna system receiving signals in the 10 GHz
range and offsetting the signals to the 1 GHz range, you can set a frequency offset in the spectrum analyzer in
order to display the actual received antenna frequency in the sweep window.
Both positive and negative offset values are allowed. Negative offsets can be useful for seeing differences from
expected values. Enter a negative offset of the expected value, and the received antenna frequency should
display in the 0 Hz range.
When enabled, the offset value is displayed at the left of the screen in the status panel (see
Panel"). To remove a frequency offset, open the FREQ SPAN menu and set FREQUENCY OFFSET to 0 Hz.
You can also access this parameter directly from the left side status panel.
Note Offset frequency apply to start, stop, center, and marker frequencies.

Setting the Span

1. Select FREQ SPAN on the main menu.
2. Select SPAN to open the span frequency parameter entry keypad.
3. Enter the desired span frequency. When entering a frequency with the keypad, available frequency units
(GHz, MHz, kHz, and Hz) will be displayed along the left edge of the menu.
4. Select the appropriate frequency unit to terminate the entry or press ACCEPT to terminate the entry
with the current frequency unit.
5. To select full span, press the FULL SPAN. Selecting full span overrides any previously set start and stop
frequencies.
To quickly move the span value up or down, press the + or - slider controls to increment the span in
Note
a 1:2:5 sequence. You can also drag the span using the slider or by pinching the trace in or out.
Spectrum Analyzer MG PN: 10580-00447 Rev. E
3-3 Setting Frequency Parameters
Section 2-4 "Status
3-3