R&S SMB100A Operating Manual page 497

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R&S SMB100A
The frequency entered and displayed in the "Frequency" field takes any set frequency
offset into consideration, e.g. an offset set for a downstream instrument. This means
that with a frequency offset the frequency displayed in the header does not correspond
to the frequency at the RF output, but rather to the frequency at the output of the down-
stream instrument.
This allows the target frequency at the output of a downstream instrument to be
entered in the frequency field. The signal generator changes the RF output frequency
according to the entered offset.
However, the frequency entered and displayed in the "Frequency/Phase" dialog of the
"RF" function block always corresponds to the RF output frequency. Any frequency off-
set is not taken into consideration.
The correlation is as follows:
Freq in header = RF output frequency (= Freq in dialog) + Freq offset (= Offset in dia-
log)
OVERLOAD
The power of the external signal applied to the RF output is too high. The overload pro-
tection is tripped and the connection between the RF output and attenuator is interrup-
ted. The overload protection is reset by pressing the RF ON/OFF key. The RF input is
activated when the overload protection is reset.
LEVEL OFFSET
A level offset is set.
The level entered and displayed in the "Level" field takes the offset of any downstream
attenuators/amplifiers into consideration by way of calculation. This means that with a
level offset the level displayed in the header does not correspond to the level at the RF
output, but rather to the level at the output of the downstream instrument.
This allows the target level at the output of downstream instruments to be entered. The
signal generator changes the RF output level according to the set offset.
However, the level entered and displayed in the "Level" dialog of the "RF" function
block always corresponds to the RF output level. Any level offset is not taken into con-
sideration.
The correlation is as follows:
Level in header = RF output level (= Level in dialog) + Level offset
EXT REF
An external reference is used.
The external signal with selectable frequency and defined level must be input at the
REF IN connector. It is output at the REF OUT connector.
BUSY
A setting or calculation is executed.
Operating Manual 1407.0806.32 ─ 21
Status Information, Error Messages and Troubleshooting
Status Information
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