Rohde & Schwarz R&S FSP Series, Руководство по эксплуатации

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Operating Manual 1164.4556.12 - 06 4.55
R&S FSP Instrument Functions
Analyzer Mode
Additionally, the REFERENCE FIXED softkey opens the submenu where it is possi-
ble to determine manually a reference point with level and frequency, time or x-axis
level, to define a level offset or deactivate the reference point.
The REFERENCE FIXED function is useful for the measurement of the harmonic
suppression at small span (fundamental not represented).
REF FXD
(ON OFF)
The REF FXD (ON OFF) softkey switches on or off the relative measurement to a
fixed reference value ( REFERENCE POINT ) independent of the trace.
Remote command:
CALC:DELT2:FUNC:FIX ON
REF POINT
LEVEL
The REF POINT LEVEL softkey enters a reference level independent of the refer-
ence marker level. All relative level values of the delta markers refer to this refer-
ence level.
Remote command:
CALC:DELT2:FUNC:FIX:RPO:Y -10dBm
REF POINT LVL
OFFSET
The REF POINT LVL OFFSET softkey specifies a level offset relevant to the refer-
ence level. The relative level values of the delta markers refer to the reference point
level plus the level offset.
The level offset is set to 0 dB on enabling the REFERENCE FIXED or PHASE
NOISE function.
Remote command:
CALC:DELT2:FUNC:FIX:RPO:Y:OFFS 0dB
REF POINT
FREQUENCY
With the REF POINT FREQUENCY softkey a reference frequency can be manually
activated for the delta markers when the REFERENCE FIXED or PHASE NOISE
function is used.
Remote command:
CALC:DELT2:FUNC:FIX:RPO:X 10.7MHz
REF POINT
TIME
The REF POINT TIME softkey activates the entry box for the input of a reference
time for the REFERENCE FIXED function in the time domain (span = 0 Hz).
Remote command:
CALC:DELT2:FUNC:FIX:RPO:X 5MS
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:
CALC:DELT2:FUNC:FIX:RPO:X -5DBM
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 FSP.
[
PRESET ] R&S FSP is set to the default setting.
[ CENTER : 100 MHz ] The center frequency of R&S FSP is set to 100 MHz.
[ SPAN : 1 MHz ] The span is set to 1 MHz.
[ AMPL : 3 dBm ] The reference level is set to 3 dBm (3 dB above the
expected RF level).