Acquisition and waveform setup
R&S
®
RTO6
128
User Manual 1801.6687.02 ─ 05
Interpolation
Selects the interpolation method. If the defined "Sample rate" is higher than the ADC
sample rate, interpolation adds points between the captured samples of the waveform
by various mathematic methods.
"Linear"
Two adjacent ADC sample points are connected by a straight line, the
interpolated points are located on the line. You see a polygonal wave-
form similar to the real signal, and also the ADC sample points as
vertexes.
"sin (x)/x"
Two adjacent ADC sample points are connected by a sin(x)/x curve,
and also the adjoining sample points are considered by this curve.
The interpolated points are located on the resulting curve. This inter-
polation method is precise and shows the best signal curve.
"Sample/Hold"
The ADC sample points are displayed like a histogram. For each
sample interval, the voltage is taken from the sample point and con-
sidered as constant, and the intervals are connected with vertical
lines. Thus, you see the discrete values of the ADC - the measured
samples.
Remote command:
Sample rate mode
You can choose to keep constant either the sample rate or the record length when you
adjust the time scale or acquisition time.
See also:
Chapter 5.1.3, "Horizontal system"
"Set by user"
With constant sample rate and resolution, increasing the time scale
also increases the record length, and vice versa. You can limit the
record length to a maximum value.
"Fixed record
length"
With constant record length, increasing the time scale reduces the
sample rate and coarsens the resolution, that is, the time between
two waveform samples gets longer.
Remote command:
Auto adjustment
Prevents undersampling and ensures a sufficient resolution to acquire the correct
waveform if the time scale is changed. The setting takes effect if the changed parame-
ter - resolution or record length - reaches a limit. The instrument automatically keeps
this parameter constant at its limit, and changes the other parameter regardless of the
"Resolution / Record length" setting.
See also:
Remote command:
Acquire settings
