Data Sheet

4 To Set the Sample System RIGOL
MSO4000/DS4000 User’s Guide
4-9
Memory Depth
Memory depth refers to the number of waveform points that the oscilloscope can
store in a single trigger sample and it reflects the storage ability of the sample
memory. MSO4000/DS4000 provides up to 140 M points memory depth.
T
Trigger Point
Pre-
sample
Delayed Sample
Memory Depth
The relation of memory depth, sample rate and waveform length fulfills the equation
below:
Memory depth = sample rate (Sa/s) × waveform length (s/div × div)
Thus, higher memory depth can ensure higher sample rate.
Press Acquire  Mem Depth, use to switch to the desired memory depth (the
default is auto) and then press down the knob to select the option. You can also
press Mem Depth continuously to switch the memory depth.
When a single channel is enabled, the memory depths available include Auto,
14kPoints, 140kPoints, 1.4MPoints, 14MPoints and 140MPoints. In “Auto” mode, the
oscilloscope selects the memory depth automatically according to the current sample
rate.
When dual channels are enabled (CH1 and CH2 or CH3 and CH4), the memory
depths available include Auto, 7kPoints, 70kPoints, 700kPoints, 7MPoints and
70MPoints. In “Auto” mode, the oscilloscope selects the memory depth automatically
according to the current sample rate.