User manual

Chapter 2 Command System RIGOL
MSO7000/DS7000 Programming Guide 2-5
Remarks
 When "AUTO" is selected, the oscilloscope selects the memory depth automatically
according to the current sample rate.
 The maximum memory depth for the single channel is 500 M; the maximum memory
depth for the dual-channel is 250 M; and the maximum memory depth for the
four-channel is 125 M.
Return
Format
The query returns AUTO, 1k, 10k, 100k, 1M, 10M, 25M, 50M, 100M, 125M, 250M, 500M,
1000, 10000, 100000, 1000000, 10000000, 25000000, 50000000, 100000000,
125000000, 250000000, 500000000, 1e3, 1e4, 1e5, 1e6, 1e7, 2.5e7, 5e7, 1e8, 1.25e8,
2.5e8, or 5e8.
Example
:ACQuire:MDEPth 1M /*Sets the memory depth to 1M.*/
:ACQuire:MDEPth? /*The query returns 1M.*/
:ACQuire:TYPE
Syntax
:ACQuire:TYPE <type>
:ACQuire:TYPE?
Description
Sets or queries the acquisition mode of the oscilloscope.
Parameter
Name
Type
Range
Default
<type>
Discrete
{NORMal|AVERages|PEAK|}
NORMal
Remarks
 NORMal: In this mode, the oscilloscope samples the signal at a specified fixed time
interval to rebuild the waveform. For most of the waveforms, using this mode can
produce the optimal display effects.
 AVERages: In this mode, the oscilloscope averages the waveforms from multiple
samples to reduce the random noise of the input signal and improve the vertical
resolution. Greater number of averages can lower the noise and increase the vertical
resolution; while at the same time, it will slow the response of the displayed
waveform to the waveform changes.
 PEAK: indicates the peak detection. In this mode, the oscilloscope samples the
maximum and minimum value of the signal at the fixed sampling interval to acquire
the signal envelope or the narrow pulses that might be lost. In this mode, signal
aliasing can be prevented, but the noise displayed would be larger.
Return
Format
The query returns NORM, AVER, or PEAK.
Example
:ACQuire:TYPE AVERages /*Sets the acquisition mode to AVERages.*/
:ACQuire:TYPE? /*The query returns AVER.*/
:ACQuire:SRATe?
Syntax
:ACQuire:SRATe?
Description
Queries the current sample rate. The default unit is Sa/s.
Remarks
 Sample rate indicates the frequency of the signal sampling, i.g. the number of
waveform points sampled per second.
 The formula below describes the relationship among sample rate, memory depth, and
waveform length:
memory depth = sample rate x waveform length
Wherein, the memory depth is set by the :ACQuire:MDEPth command. The waveform