Troubleshooting R&S SMB
1407.0806.82 3.16 E-6
Instrument Faults
The following table lists R&S SMB Faults. For every fault additional test are described to determine the
defective module.
Fault Test Action if test fails
RF Output Level
is wrong
R&S SMB settings:
• Instrument Preset
• Reference internal
• RF on
• Level = 15 dBm
Measure the Output Level with a power meter
across the frequency range. The difference
between set and measured level has to be
lower than guaranteed in the datasheet.
Check the mating torque of the
SMA-connector at cable W 212
being 60 N cm.
Most probably the RF Board is
defective. Check the RF Board
being supplied correct (see
page 3.24).
R&S SMB settings:
• Instrument Preset
• Setup Adjustment ‘Adjust all’
• Setup Reference external
• RF on
• Level: 0 dBm
• Frequency = 1 GHz
Supply an external 10 MHz reference signal
meeting the level and frequency specification
given in the datasheet. Measure output
frequency with a spectrum analyzer or a
frequency counter synchronized to the same
reference. The frequency error has to be <
0.1 Hz.
Most probably the RF Board is
defective. Check the RF Board
being supplied correct (see
page 3.24).
RF Output
Frequency is
wrong
R&S SMB setting:
• Setup Reference internal
Measure the 10 MHz reference output signal
with spectrum analyzer or frequency counter
and power meter. Output frequency and level
have to meet the specifications given in the
data sheet.
Without Reference Oscillator B1
being equipped most probably the
RF Board is defective. Check the RF
Board being supplied correct (see
page 3.24).
If the R&S SMB is equipped with
Reference Oscillator R&S SMB-B1
remove the unit (see page 3.57) and
perform this test again. If it works
most probably the Reference
Oscillator B1 is defective. Check the
Reference Oscillator being supplied
correct (see page 3.30).
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