User manual

Measurements
R&S
®
RTO
137User Manual 1316.0827.02 ─ 06
In the R&S RTO, the eye diagram is automatically set up for jitter measurements. The
following characteristic values and jitter parameters can be determined:
Fig. 5-2: Basic eye diagram characteristics
The default eye/jitter measurement is extinction ratio (%).
To obtain optimized settings for an eye measurement, use the "Autoset" function that is
provided on the right side of the "Eye/Jitter" tab.
Table 5-5: Eye/jitter measurement types
Meas. type Description/Result
2 Extinction ratio (%) Top level / Base level in percent
(V
top
/V
base
*100)
3 Extinction ratio (dB) Top level / Base level in dB
10*log (V
top
/V
base
)
4 Eye height Vertical eye size
(V
top
– 3 * σ_top) – (V
base
+ 3 * σ_base)
5 Eye width Horizontal eye size
(Tcrossing2 – 3 * Sigma_crossing2) – (Tcrossing 1 – 3 * Sigma_crossing1)
6 Eye top High signal level (V
top
)
7 Eye base Low signal level (V
base
)
10 Q factor
(V
top
– V
base
)/(σ_top + σ_base)
14 Noise (RMS) Average of top and base deviation
15 S/N ratio Signal-to-Noise Ratio
20 * log (Eye height / NoiseRMS)
16 Duty cycle distortion Eye Rise Time / Eye Fall Time
Automatic Measurements