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MODEL 8559A PERFORMANCE TESTS
PERFORMANCE TESTS
4
-
17. AVERAGE NOISE LEVEL
SPECIFICATION:
The maximum average noise level for each frequency band, with
1
kHz resolution bandwidth and 0 dB attenua
-
tion, is given in Table 4
-
5.
DESCRIPTION:
The average noise level of the spectrum analyzer is checked by observing the average noise power level displayed
on
the CRT when no input signal is applied to the instrument.
-
111
dBm
LIMIT
AVERAGE NOISE
POWER LEVEL
FIGURE
4-13,
AVERAGE NOISE LEVEL MEASUREMENT,
.01-
3
GHz
EQUIPMENT:
Variable
Persistence/Storage Display
......................................
HP 181T/TR
.................................................
5OQ Termination
HP
909A, Opt. 01
2
NOTE
The HP 853A Spectrum Analyzer Display may be substituted for the HP
181T/TR in this procedure.
NOTE
This test can be performed with no input termination if INPUT ATTEN is set
to
20
dB. Note that the input attenuation must then be taken into consider
-
ation in establishing the equivalent REFERENCE LEVEL control setting for
the measurement. A REFERENCE LEVEL setting of
-
40
dBm with
20
dB
INPUT
ATTEN is equivalent to a REFERENCE LEVEL setting of
-
60
dBm
with
0
dB INPUT ATTEN.