Rohde & Schwarz ESRP Series, User Manual

Page: 355 / 1094

Spectrum Measurements
R&S
®
ESRP
352 User Manual 1175.7445.02 ─ 08
6.2.8.2 Specifying the Trigger Settings
1. Press the "Trg/Gate Source" softkey to select the trigger mode (for details see "Trg/
Gate Source" on page 346.
2. Press the Trg/Gate Level softkey to set the trigger level.
3. Press the Trigger Offset softkey to set the trigger offset. In addition, a Trigger Hys-
teresis and Trigger Holdoff can be defined via the corresponding softkeys.
For details on gated sweep operation, see Chapter 6.2.8.3, "Using Gated Sweep Oper-
ation" , on page 352.
6.2.8.3 Using Gated Sweep Operation
By using a gate in sweep mode and stopping the measurement while the gate signal is
inactive, the spectrum for pulsed RF carriers can be displayed without the superposi-
tion of frequency components generated during switching. Similarly, the spectrum can
also be examined for an inactive carrier. The sweep can be controlled by an external
gate or by the internal power trigger.
Gated sweep operation is also possible for span = 0. This enables – e.g. in burst sig-
nals – level variations of individual slots to be displayed versus time.
1. Press the Gate Settings softkey to define the settings of the gate mode.
At the center frequency a transition to zero span is made and the time parameters
gate delay and gate length are displayed as vertical lines to adjust them easily.
When quitting the Gate Settings submenu, the original span is retrieved so the
desired measurement can be performed with the accurately set gate.
2. Setting the parameters gate delay and gate length highly accurate, press the
Sweep Time softkey to alter the x-axis in a way that the signal range concerned
(e.g. one full burst) is displayed.
3. Press the Gate Delay softkey to set the sampling time in a way that the desired
portion of the signal is shown.
4. Press the Gate Mode (Lvl/Edge) softkey to set the gate mode.
5. If the "Edge" gate mode has been selected, press the Gate Length (Gate Mode
Edge) softkey to set the sampling duration in a way that the desired portion of the
signal is shown.
6. Press the Trg/Gate Polarity softkey to set the polarity of the trigger source.
7. Press the Gated Trigger softkey to activate the gated sweep mode.
To indicate that a gate is used for the sweep, the enhancement label "GAT" is dis-
played on the screen. This label appears to the right of the window for which the
gate is configured.
Configuration