Tektronix RSA3300A, Service Manual

Page: 87 / 284

Performance Tests
RSA3303A & RSA3308A Service Manual
4- 31
c. Set the generator controls:
Frequency 1500 MHz . . . . . . . . . . . . . . . .
Amplitude --5 dBm . . . . . . . . . . . . . . . .
RF output On . . . . . . . . . . . . . . . .
d.
Hook up the signal generator: Connect the generator output through a
50
Ω
N-N coaxial cable to the analyzer INPUT . See Figure 4--14.
2. Check phase noise for a span of 100 kHz:
a. Modify the analyzer controls:
H
Press the
SPAN
key on the front panel.
H
With the Span side key, set the span to 100 kHz using the general
purpose knob or the numeric keypad.
H
Press the RBW/FFT key on the front panel.
H
Press the RBW/FFT side key to select Man .
H
With the RBW side key, set the RBW to 200 Hz.
b.
Perform the C/N (Carrier-to-Noise ratio) measurement:
H
Press the MEASURE > C/N > MEAS SETUP key.
H
Press the Offset Frequency side key and set the value to 10 kHz
using the general purpose knob.
H
Press the Noise Bandwidth side key and set the value to 2 kHz
using the general purpose knob.
c. Check against limits: Read the phase noise (C/No) at the bottom of the
screen. Confirm that the value is 100 dB/Hz or more.
3. Check phase noise for a span of 1 MHz:
a.
Modify the analyzer controls:
H
Press the SPAN key on the front panel.
H
With the Span side key, set the span to 1 MHz using the general
purpose knob or the numeric keypad.
H
Press the RBW/FFT key on the front panel.
H
Press the RBW/FFT side key to select Man .
H
With the RBW side key, set the RBW to 2 kHz.