Tektronix 11801C User Manual page 302

Measurements
3 152
Table 3 13: Measurement Parameters (Cont.)
SW HW Stat Name
Reference
n n n
Topline
Reference
n n n
Tracking
Reference
n
Transition
Number
Right Limit
n n
Search Mode
n
Definition
The 100% level on which the reference
mesial level is based. When reference
tracking is set to Both or Topline, the
11801C repeatedly determines the refer
ence topline for itself and you cannot
adjust it. When reference tracking is set
to Baseline or Off, you can set the top
line or you can have the 11801C set it
once by touching the Setup selector.
The track mode on the reference trace
for propagation delay and phase mea
surements.
The transition number on the reference
trace used in propagation delay and
phase measurements.
The end of the trace measurement
zone.
For frequency domain measurements.
When search mode is set to Harmonic,
the instrument determines the funda
mental frequency, f0, by searching for
the highest peak of the FFT magnitude
in the measurement zone. The harmon
ic components are computed as n x f,
where n is the user defined harmonic
number.
When search mode is set to Peak, a
spectral peak is defined as a peak of
the FFT magnitude greater than the ref
erence level. Using the pop up menu,
you can specify the index of the peak to
be measured and the reference level.
Reference