Keysight E6680A - Page 197

3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
Dependencies Center Frequency can be limited by Start Freq or Stop Freq limits, if Span is so large that start or stop
reach their limits
Couplings When operating in “swept span”, any value of Center Frequency or Span that is within the frequency
range of the instrument is allowed, if the value is being set through the front panel numeric key pad or
the SCPI command. The other parameter is forced to a different value if needed, to keep Start and
Stop Frequencies within the instrument’s frequency range
Coupling between center frequency and span: numeric (keypad) entries are treated differently than
changing the value using the step keys (Up/Down Arrows) or the knob. Similarly, for remote operation,
sending a numeric frequency value is treated differently than the UP|DOWN keywords:
–
Numeric entries (keypad or remote): Any value of Center Frequency or Span (within the frequency
range of the instrument) is allowed. The other parameter is changed, as necessary, to keep the
Start Freq and Stop Freq within the instrument frequency range
–
Knob or Step keys (up/down arrows) or UP|DOWN keywords: The value of the parameter being
changed (Center Frequency or Span) is limited so the other parameter is not forced to a new
value. Thus, if only the step keys and knob are used, you can return to the initial Center Frequency
and Span by changing only the current parameter
Note that, since out-of-range Start Freq and Stop Freq are never allowed, markers and trace math
work correctly without requiring any special handling for out-of-range conditions
Preset Depends on instrument maximum frequency, mode, measurement, and selected input
See "Center Frequency Presets" on page 197 and "Ext Mix Center Freq" on page 200
State Saved Saved in instrument state
Min/Max Depends on instrument maximum frequency, mode, measurement, and selected input
See "Center Frequency Presets" on page 197 and "Ext Mix Center Freq" on page 200
Annotation Center <value> appears in the lower left corner of the display
Status Bits/OPC
dependencies
Non-overlapped
Center Frequency Presets
The following table provides the Center Frequency Presets for the Spectrum
Analyzer mode, and the Max Freq, for the various frequency options:
Freq Option CF after Mode
Preset
Stop Freq after Mode
Preset
Max Freq
(can't tune
above)
503 (all but CXA) 1.805 GHz 3.6 GHz 3.7 GHz
503 (CXA) 1.505 GHz 3.0 GHz 3.08 GHz
507 (all but CXA) 3.505 GHz 7.0GHz 7.1 GHz
507 (CXA) 3.755 GHz 7.5GHz 7.58 GHz
508 (all but MXE) 1.805 GHz 3.6GHz 8.5 GHz
508 (MXE) 4.205 GHz 8.4GHz 8.5 GHz
197 IQ Analyzer Mode User's &Programmer's Reference