R&S 1129.7246.03, Operating Manual

Page: 141 / 855

R&S ESU Instrument Functions
Analyzer Mode
4.110 Operating Manual 1302.6163.12 - 03
RF INPUT 1 | 2 The RF INPUT 1/2 softkey selects the RF input.
Input 1 is the default setting. Alternatively, the pulse-resistant input 2 can be used in
a frequency range up to 1 GHz.
REF LEVEL
POSITION
The REF LEVEL POSITION softkey allows the reference level position to be
entered.
The setting range is from -200 to +200%, 0% corresponding to the lower and 100%
to the upper limit of the diagram.
Remote command:
DISP:WIND:TRAC:RPOS 100PCT
REF LEVEL
OFFSET
The REF LEVEL OFFSET softkey allows the arithmetic level offset to be entered.
This offset is added to the measured level irrespective of the selected unit. The scal-
ing of the y-axis is changed accordingly.
The setting range is ±200 dB in 0.1 dB steps.
Remote command:
DISP:WIND:TRAC:RLEV:OFFS -10dB
Remote command:
GRID
ABS | REL
The GRID ABS/REL softkey switches between absolute and relative scaling of the
level axis.
GRID ABS is the default setting.
For setting RANGE LINEAR (linear scaling, labelling of axes in %) the softkey is not
displayed since the unit % itself implies a relative scale.
Remote command:
DISP:WIND:TRAC:Y:MODE ABS
RF INPUT
50 Ohm |
75 Ohm
The RF INPUT 50
Ω
/ 75
Ω
softkey switches the input impedance of the instrument
between 50
Ω
(= default setting) and 75
Ω
.
The setting 75
Ω
should be used if the input impedance (50
Ω
) is transformed to 75
Ω
using the corresponding adapter unit of type RAZ (= 25
Ω
in series to the input
impedance of the R&S ESU). The correction value used for the adoption is 1.76 dB
= 10 log (75
Ω
/ 50
Ω
).
All levels specified in this operating manual refer to the default setting of the instru-
ment (50
Ω
).
Remote command:
INP:IMP 50OHM
RANGE LOG
100 dB
The RANGE LOG 100 dB softkey sets the level display range to 100 dB.
Remote command:
DISP:WIND:TRAC:Y:SPAC LOG
DISP:WIND:TRAC:Y 100DB
ABS The labelling of the level lines refers to the absolute value of the reference
level.
REL The upper line of the grid is always at 0 dB.
The scaling is in dB whereas the reference level is always in the set unit
(dBm, dBmV,..).