Triggering the Sweep - Analyzer R&S ESCI
1166.6004.12 4.98 E-1
GATE
DELAY
The GATE DELAY softkey activates the window for setting
the delay time between the gate signal and the continuation
of the sweep.
This may be useful for taking into account a delay between
the gate signal and the stabilization of an RF carrier for
example.
As gate delay, values between 125 ns and 100 s may be set.
The position of the delay on the time axis in relation to the
sweep is indicated by the line labelled GD.
As there is a common input signal for trigger and gate if
EXTERN or IF POWER is selected, changes to the gate
delay will affect the trigger delay (TRIGGER OFFSET) as
well.
IEC/IEEE-bus command: SWE:EGAT:HOLD 1US
GATE
LENGTH
The GATE LENGTH softkey activates the window for setting
the sweep duration of R&S ESCI in the edge-triggered mode.
Values between 125 ns and 100 s may be set for the gate
length. The length of the gate in relation to the sweep is
indicated by the line labelled GL.
This softkey is only available if GATE MODE EDGE (edge
triggering) has been selected.
IEC/IEEE-bus command: SWE:EGAT:LENG 100US
SWEEPTIME
The SWEEP TIME softkey enables the user to change the
time axis to obtain a higher resolution for positioning gate
delay and gate length.
When this is to be done, the sweep time temporarily changes;
the original value is restored when the menu is quit.
IEC/IEEE-bus command: --
PRINT
SCREEN
The PRINT SCREEN softkey allows the gate settings to be
output on a printer.
IEC/IEEE-bus command: --
Measurement example:
The modulation spectrum of a GSM or PCS1900 signal is to be measured using the gated-sweep
function. The signal is generated by a Signal Generator SME03 whose RF output is directly connected
to the RF input of R&S ESCI.
The modulation spectrum of a GSM 900 signal is to be measured using the gated-sweep function. The signal
is generated by a Signal Generator SME03 whose RF output is directly connected to the RF input of R&S
ESCI.
Settings on SME03:
FREQ: 802 MHz
Level: 0 dBm: Return
Digital Mod: Select: GMSK: Select
Source: Select: PRBS: Select: Return
Level Attenuation: Select: 60 dB: Return
The SME03 supplies a GMSK-modulated TDMA signal (GSM).
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