Acquisition and Waveform Setup
R&S
®
RTM20xx
26User Manual 1317.4726.02 ─ 01
"Automatic"
Default mode: To display the best waveform, the instrument selects the
optimum combination of waveform acquisition rate and sample rate
using the full memory depth (maximum record length).
"Set Rec.
Length"
The instrument acquires the signals at a sample rate that fills up an
user-defined record length, which is defined using "Record Length".
Remote command:
ACQuire:WRATe on page 286
Record Length
Sets the record length, the number of recorded waveform points that build the waveform
across the acquisition time. The value is used if "Waveform Rate" is set to "Set Rec.
Length".
Remote command:
ACQuire:POINts[:VALue]
Roll
Enables the roll mode.
The roll mode moves the captured input data on the display from the right to the left. The
instrument shows the waveform immediately, without waiting for the complete acquisition
of the waveform record. The roll mode displays the untriggered signal. Use the roll mode
for slow, non-repetitive signals with 200 kHz or slower.
Remote command:
TIMebase:ROLL:ENABle on page 287
Sample Mode
Defines how the waveform is created from the sample points which are acquired by the
ADC.
"Real Time"
At slow time base settings the oscilloscope can acquire enough points
to create an accurate waveform, so the sampled points of the input sig-
nal are used directly to build the waveform.
With fast time base settings, the sample rate is higher than the ADC
sample rate. Waveform samples are added to the ADC samples
according to the selected interpolation method.
See also: "Interpolation" on page 27
Real-time sampling is used to capture fast, single-shot, transient sig-
nals.
"Equivalent
Time"
Random equivalent-time sampling: This mode requires repetitive, sta-
ble signals. It is used to capture fast signals whose frequency compo-
nents may be much higher than the sample rate of the ADC. The wave-
form points are taken from several acquisitions at a different time in
relation to the trigger point. The time difference between the sample
and the trigger is random. Then, all the sampled points are put together
into one composite waveform.
Remote command:
ACQuire:MODE on page 285
Reference for Waveform Setup
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