Instrument Function
R&S
®
SMB100A
145Operating Manual 1407.0806.32 ─ 13
●
When very low-power signals are to be measured, e.g. less than 10 dB above the
lower measurement limit.
●
Switch off the RF power source for zeroing; do not disconnect it from the power sen-
sor. In this way you will maintain the thermal equilibrium, and zeroing will also com-
pensate for the noise superimposed on the measured signal (e.g. from a broadband
amplifier).
Remote command:
:SENSe<ch>[:POWer]:ZERO on page 287
Source - Power Sensors
Selects the source for measurement.
"RF"
Measurement source is the RF signal of the generator. The RF fre-
quency is used as the measurement frequency of the sensor and the
corresponding correction factor is used.
In this mode the RF frequency of the generator is send to the sensor
automatically if changed.
"User"
Measurements source is any freely selectable source. The frequency
is entered manually under frequency (e.g. for measurement of amplifier
gain with 2 sensors).
Remote command:
:SENSe<ch>[:POWer]:SOURce on page 286
Frequency - Power Sensors
Source User only
Enters the frequency for measurement source "User".
Remote command:
:SENSe<ch>[:POWer]:FREQuency on page 284
Level Offset - Power Sensors
Activates and defines a level offset which is added to the measured value. This allows
e.g. an attenuator in the signal path to be considered. The offset is always entered in dB,
irrespective of the selected unit for result display.
Remote command:
:SENSe<ch>[:POWer]:OFFSet:STATe on page 285
:SENSe<ch>[:POWer]:OFFSet on page 285
Auto Once
Searches for the optimum filter length for the current measurement conditions and indi-
cates value in the "Filter Length" field above.
Remote command:
:SENSe<ch>[:POWer]:FILTer:SONCe on page 283
Filter Length - Power Sensors
Selects the filter length used for measurement. The filter length is the multiplier for the
measurement time and thus directly influences it.
RF Block
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