Anritsu MT8801C, Operation Manual, Page: 72 / 137

Section 3 Operation
3-62
(2) Measurement procedure
Step Operation procedure
1 Press the spectrum analyzer [Preset] key.
2 Span frequency setting: F2: Span , [4], [0], [kHz]
Sets the span frequency to 3 or 4 times the offset frequency.
3 Reference level setting: F3: Amplitude , [2], [0], [dBm]
4 Center frequency setting: F1: Frequency , [1], [.], [9], [GHz]
5 RBW setting: [Next Menu], F1: Coupled Function , F7: RBW, [1], [kHz]
6 VBW setting: F12: return, F8: VBW, [3], [0], [Hz]
7 Marker setting: [Next Menu], F4: Marker , F12: Zone Width, F7: Spot
8 Peak setting: After one sweep, F5: Peak Search , F11: Peak
→
CF, F12: Peak
→
RLV
9 Marker position setting: F4: Marker , F8: Delta Marker, [1], [0], [kHz]
(Becomes the offset frequency.)
10 C/N measurement: [Next Menu], F5: Measure , F8: C/N Ratio Measure: F7: Meas On
The measured result is displayed at the top left-hand corner of the screen each time the sweep is
updated.
★
Example of measured result: –102.61 dBc/Hz
★
Select the best C/N measured value by changing the RBW value. Also, make the
ATT value minimum.
Zone Center =
500.008 000MH
C/N ratio measurement example
Note:
In this measurement, the measured value does not become 0 dBm even when
the marker frequency is moved to the reference level (carrier signal peak).
This is because a correction value is also added as noise relative to the refer-
ence marker carrier.