LOCAL OPERATION RTBB OPTION 008 MODULATION: INTERNAL IQ
IQ
MOD
B5553
SIG
GEN
B5681
...
B5617
3-56
Internal IQ menu — <Self-Cal>
Self-Cal
For optimum performance when in the IQ mode, run a self-calibration to make sure that the
instrument meets its specification. When calibration is valid, the main screen (and a few others)
shows ‘Optimized’. When calibration is invalid (for example, out of frequency range) ‘Optimized’
no longer appears; instead, a question mark appears in the IQ softbox:
IQ?
.
Touch the
Start
Cal
0
soft box, and the instrument performs the IQ self-calibration operation chosen
below, in order to re-align the IQ modulator. An Abort Cal soft box appears, allowing you to stop
the self-calibration if you wish.
Mode CAL:IQUS:MODE page 4-174
Use the numeric keypad to specify the internal IQ self-calibration mode:
0 Spot Freq Performs an IQ self-calibration at the current frequency.
1 Freq Band A pop-up menu — Freq Span — appears. Use the numeric keypad to
define the frequency span (± 10, 20, 40 or 60 MHz with respect to the
current carrier frequency) over which the IQ self-calibration is performed.
2 Multi Band <Table> and <Edit> soft tabs appear, allowing you to define up to four
frequency bands over which the IQ self-calibration is performed. Use the
numeric keypad to enter start and stop frequencies for each band.
3 Freq List <Table> and <Edit> soft tabs appear. Use the numeric keypad to define
up to 500 list frequencies at which the IQ self-calibration is performed.
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