R&S ESU Series Operating Manual page 180

R&S ESU
REF POINT With the REF POINT FREQUENCY softkey a reference frequency can be manually
FREQUENCY activated for the delta markers when the REFERENCE FIXED or PHASE NOISE
function is used.
Remote command:
REF POINT The REF POINT TIME softkey activates the entry box for the input of a reference
TIME time for the REFERENCE FIXED function in the time domain (span = 0 Hz).
Remote command:
For phase noise measurement, input of reference time is not possible.
PEAK SEARCH The PEAK SEARCH softkey defines the maximum of the selected trace as refer-
ence level for all delta markers when using the REFERENCE FIXED function.
Remote command:
Measurement example
Small-span harmonics measurement to increase sensitivity
CW signal (e.g. 100 MHz, 0 dBm) with harmonics at the RF input of R&S ESU.
[PRESET]
[CENTER: 100 MHz]
[SPAN: 1 MHz]
[AMPL: 3 dBm]
[MKR]
[MARKER 2]
[REFERENCE FIXED] The frequency and level of MARKER 1 are a reference for
[CENTER: 200 MHz]
[MKR->: PEAK]
MARKER The MARKER ZOOM softkey expands the area around MARKER 1. With the zoom
ZOOM function, more details of the spectrum can be seen. The desired display range can
be defined in an entry window.
The following sweep is stopped at the position of the reference marker. The fre-
quency of the signal is counted and the measured frequency becomes the new cen-
ter frequency. The zoomed display range is then configured and the new settings
are used by R&S ESU for further measurements.
As long as switching to the new frequency display range has not yet taken place,
pressing the softkey will abort the procedure.
Operating Manual 1302.6163.12 - 03
CALC:DELT2:FUNC:FIX:RPO:X 10.7MHz
CALC:DELT2:FUNC:FIX:RPO:X 5MS
CALC:DELT2:FUNC:FIX:RPO:X -5DBM
R&S ESU is set to the default setting.
The center frequency of R&S ESU is set to 100 MHz.
The span is set to 1 MHz.
The reference level is set to 3 dBm (3 dB above the
expected RF level).
MARKER 1 is switched on ('1' highlighted in the softkey)
and set to the signal peak.
MARKER 2 is switched on and automatically defined as the
delta marker (DELTA is highlighted on MARKER NORM
DELTA softkey).
the delta marker.
The center frequency is set to 200 MHz (= frequency of the
2nd harmonic). The reference level may have to be
reduced to see the 2nd harmonic from the noise. This does
not affect the reference level set with REFERENCE FIXED.
The delta marker jumps to the 2nd harmonic of the signal.
The level spacing of the harmonic to the fundamental is dis-
played in the marker info field.
Instrument Functions
Analyzer Mode
4.149