Rohde & Schwarz SML01 - Level Offset; Non-Interrupting Level Setting; Fig. 4-4 Typical Setup with Level Offset

R&S®SML / R&S®SMV03 RF Level
1090.3123.12 4.5 E-6
Level Offset
On the R&S SML / R&S SMV03, it is possible to enter an offset for a subsequent attenuator/amplifier, if
any, in the Level menu. The offset is taken into account in the display in the header line (see below),
which represents the level value of the signal at the output of the subsequent unit (see Fig. 4-4).
The level of the RF output signal is therefore calculated from the amplitude displayed in the header line
and the offset entered in the Level - Level menu as follows:
RF output level = amplitude displayed in the header line – offset
The entered offset has no influence on the RF output signal of the R&S SML / R&S SMV03; the offset is
only taken into account in the displayed level value. The value with the offset can be directly entered
with the [LEVEL] key.
The RF output level of the R&S SML / R&S SMV03 is indicated in the Level - Level menu.
Input value
offset
RF output level
Attenuator/
amplifier
Indicated value
display
R&S SML/
R&S SMV03
Fig. 4-4 Typical setup with level offset
Non-Interrupting Level Setting
With Attenuator Mode Fixed, non-interrupting level setting is performed. Level settings are made
electronically only in a 20-dB range downwards from switching level with fixed attenuator.
(Full “Fix”Range 28/30-dB overrange aprox.)
Note: Level accuracy and spectral purity are not guaranteed over the full “Fix”Range.
If the level falls below the permissible variation range, the warning "Level underrange" is output in the
status line of the display; if it attains or goes beyond the upper limit value, the warning "Level overrange"
or “Unleveled” is output.
Please note limit and/or other limiting factors.
Table 4-1 Basic switching levels for SML01/03,SMV03 (current model of SMV03 only) w/o B10
CW AM
SML01
5 dBm .
..(0, -5 ...) 2 dBm ...(-3 -8 ...)
SML02/03,SMV03
3 dBm
...(-2, -7 ...) 0 dBm ...(-5, -10 ...)
usw. in 5-dB-Stufen
Then the following level ranges will arise (0 dB setting of attenuator):
CW (from … until) AM *) (from … until)
SML01
5
-20 = -15 dBm , 5 +8 = 13 dBm 2 -17 = -15 dBm , 2 +8 = 13 dBm
SML02/03,SMV03
3
-20 = -17 dBm , 3 +10 = 13 dBm 0 -17 = -17 dBm , 0 +8 = 13 dBm
*) max. level depends on AM depth.
Change of a fixed range via SCPI:
:outp:amod auto;:pow 0dbm;*wai;:outp:amod fixed