Tektronix H600 RFHawk, Руководство по обслуживанию, Страница: 37 / 109

Performance Veri fi cation
17. Determine the noise fl oor levels:
a. Turn off the signal generator.
b. Tap the Reset display-control button (the X button located along the right
side of the waveform plot) to reset the measurement, then wait until the
instrument averages the 100 measurements.
c. Write down the M1 marker value; this is the lower sideband noise fl oor
LNF
ssb1
.
d. Write down the M2 marker value; this is the upper sideband noise fl oor
LNF
ssb2
.
18. Obtain the signal generator phase noise level at 10 kHz offset for 100 MHz
output (
LN
sg
). This may be the typical phase noise performance stated in the
signal generator user manual or speci fi cation sheet, or it may be the actual
measured phase noise data for the signal generator. The signal generator’s
guaranteed speci
fi cation limit should not be used since that may lead to an
underestimate of the H600 or SA2600 phase noise.
For the Agilent signal generator shown in the Required Equipment list, use the
following values for the signal generator phase noise level
LN
sg
:
100 MHz: -143 dBc
3 to 6 GHz: -113 dBc
19. Write down the Resolution Bandwidth displayed in the Spectrum drawer
below
RBW , in Hz. Use this RBW value, and values obtained earlier in this
procedure, to calculate the phase noise by using the following formulas:
[in dBc/Hz]
[in dBc/Hz]
20. Verify that the phase noise is less than -95 dBc/Hz.
21. Repeat Phase Noise Veri fi cation steps 1 through 20, readjusting the signal
generator for all center frequencies noted in the Test Record.
H600 & SA2600 Service Manual 1–19