Rohde & Schwarz 1125.5555.02, Руководство по эксплуатации

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SMIQ Digital Standard PHS
1125.5555.03 E-9 2.123
CLOCK... Opens a window for selecting the clock source and for setting a delay.
FREQ
100. 000 000 0
MHz
FREQUENCY
LEVEL
ANALOG MOD
VECTOR MOD
DIGITAL MOD
DIGITAL STD
LF OUTPUT
SWEEP
LIST
MEM SEQ
UTILITIES
PHS
PHS
IS-95
NADC
PDC
GSM
STATE
MODULATION...
TRIGGER MODE
EXECUTE TRIG
TRIGGER....
CLOCK...
POWER RAMP C>
SLOT ATTENUA
CLOCK SOURCE INT EXT
MODE SYMBOL BIT
DELAY 0.00 Symb
LEVEL
- 30.0
dBm
PEP
- 27.5
dBm
SYNC
DN
1 2
Fig. 2-72 Menu DIGITAL STD - PHS - CLOCK..., SMIQ equipped with Modulation Coder SMIQB20
and Data Generator SMIQB11
(CLOCK...) CLOCK SOURCE
Selection of clock source.
INT SMIQ uses internally generated clock signals.
EXT An external symbol clock or bit clock is fed in
at connectors SYMBOL CLOCK or BIT
CLOCK. The clock synthesizer on the
modulation coder is synchronized to this
clock.
The symbol rate has to be set with an
accuracy of
±
1 %.
The polarity, the trigger threshold and the
input resistance of the clock inputs can be
modified in menu DIGITAL MOD - EXT
INPUTS.
IEC/IEEE-bus command
:SOUR:PHS:CLOC:SOUR INT
MODE
Selection of clock for external clock signal.
SYMBOL The external clock has to be a symbol clock.
BIT The external clock has to be a bit clock.
IEC/IEEE-bus command
:SOUR:PHS:CLOC:MODE SYMB
DELAY
Setting the delay of generated modulation signal to an
external clock.
This can be used, for example, for synchronization with a
second unit to achieve time synchronization between the
modulation signals of the two units.
IEC/IEEE-bus command
:SOUR:PHS:CLOC:DEL 0.5