SMIQ Digital Modulation
1125.5555.03 E-92.111
(CLOCK...) CLOCK SOURCE
Selection of clock source
INT The symbol and the bit clock in SMIQ
are generated by a clock synthesizer on
the modulation coder. All the clock
signals are synchronized to the 10-MHz
reference of the unit.
IEEE-bus
:SOUR:DM:CLOC:SOUR INT
COUPLED The clock comes from the same source
as the data.
IEEE-bus
:SOUR:DM:CLOC:SOUR COUP
EXT An external clock signal is fed externally.
The clock synthesizer on the modulation
coder is synchronized to this clock.
Parameter SYMBOL RATE has to be
correctly set with an accuracy of ± 1 %.
IEEE-bus
:SOUR:DM:CLOC:SOUR EXT
MODE
Selection of clock for the external clock signal
SYMBOL An externally fed clock has to be a
symbol clock.
BIT An externally fed clock has to be a bit
clock.
IEC/IEEE-bus
:SOUR:DM:CLOC:MODE SYMB
DELAY
Input value of delay of generated modulation signal
compared with an externally fed clock. This can be
used, for example, for synchronization with a second
unit to achieve time synchroneity between the
modulation signals of the two units. The displayed
setting resolution of 1/100 symbol is only attained for
symbol-clock frequencies below 100 kHz. The actual
resolution is reduced with increasing frequency. The
delay can no longer be set for 7 Msymb/s
IEC/IEEE-bus
:SOUR:DM:CLOC:DEL 0.5
POWER RAMP
CONTROL...
Opens a window for setting the envelope control.
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