Rohde & Schwarz SMB100A - Page 40

R&S SMB Test Procedures
1407.0806.82 1.17 E-5
Evaluation  If the power
P
r
es
< P
n
oise
- 0.41 dB
the inherent noise power of the analyzer can be subtracted:
dBPNoiseWideband
e
sPnoise
r
ef
50)1010(10log_
P
r
+=

If the power
P
r
es
> P
n
oise
0.41 dB
the analyzer resolution is not sufficient for a precise measurement.
The true result is in such case certainly more than 10 dB below the
measured value. The result than is at least:
dBdBPPNoiseWideband
n
oiseref
1050_ +=
The difference between the (possibly corrected) power P
noise
in
dBm and the power P
r
ef
in dBm is the broadband noise floor in
dBc.
 Recommended test
frequencies
 1.02 MHz, 10.1 MHz, 23.4375 MHz, 23.438 MHz, 46.875 MHz,
46.885 MHz, 65.9 MHz, 66.1 MHz, 93.75 MHz, 93.76 MHz, 143.9
MHz, 186.9 MHz, 187.6 MHz, 264.9 MHz, 374.9 MHz, 375.1 MHz,
529.9 MHz, 530.1 MHz, 749.9 MHz, 750.1 MHz, 1059.9 MHz,
1060.1 MHz, 1100 MHz, 1499.9 MHz, 1500.1 MHz, 2120.9 MHz,
2121.1 MHz, 2200 MHz, 2999.9 MHz, 3000.1 MHz, 3200 MHz,
4241.9 MHz, 4242.1 MHz, 5 GHz, 6 GHz