3 Spectrum Analyzer Mode
3.10 TOI Measurement
Tracking
Generator
Option
Min Freq
(clips to this freq when turn
TG on and can’t tune below
while TG on)
If above this Freq, Stop Freq
clipped to this Freq when TG
turned on
Max Freq
(can't tune
above)
while TG on
T13 2 MHz 13.8 GHz 13.8 GHz
T26 2 MHz 26.55 GHz 26.55 GHz
Span
Changes the displayed frequency range symmetrically about the center frequency.
While adjusting Span, Center Frequency is held constant, which means that both
Start Frequency and Stop Frequency will change.
If Span is set to a value greater than the maximum allowable span of the instrument,
an error message is generated indicating the data is out of range and was clipped to
upper limit.
Remote Command
[:SENSe]:TOI:FREQuency:SPAN <freq>
[:SENSe]:TOI:FREQuency:SPAN?
Example
:TOI:FREQ:SPAN 26.490000 GHz
:TOI:FREQ:SPAN?
Dependencies If the electrical attenuator is enabled, any attempt to set Span such that the stop frequency would be
>3.6 GHz results in an error
In instruments with an RF Preselector, such as MXE, you cannot sweep across the band break at 3.6
GHz while the RF Preselector is on in Continuous sweep, as there is a mechanical switch that
bypasses the RF Preselector above 3.6 GHz
Couplings Affects RBW, sweeptime, FFT & Sweep choice (including FFT Width, Phase Noise Optimization and
ADC Dither auto couplings)
Any value of Center Frequency or Span that is within the frequency range of the instrument is allowed
when the value is being set through the front panel numeric keypad or the SCPI command. The other
parameter is forced to a different value if needed
When using the knob or the step up/down keys or the UP |DOWN keywords in SCPI, the value that is
being changed, that is, Center Frequency or Span, is limited so that the other parameter is not forced
to a new value
Preset Depends on instrument maximum frequency, mode, measurement, and selected input
State Saved Saved in instrument state
Min 10 Hz
Max Depends on instrument maximum frequency, mode, measurement, and selected input
Note that, if Source Mode is set to Tracking, the effective instrument maximum Span may be limited
by the source maximum frequency
Annotation Span <value> appears on the first line of the annotation in the lower right corner of display
Backwards
[:SENSe]:TOINtercept:FREQuency:SPAN
Spectrum Analyzer Mode User's &Programmer's Reference 1821
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