7-8 IM 701450-01E
Box Average
At sample rates that allow box averaging, data is normally sampled at 1 GS/s or 800
MS/s regardless of the interleave mode setting (ON or OFF), and the sampled data is
decimated according to the T/div setting and stored to the acquisition memory. The
internal sample rate is the same as the envelope mode. For details, see appendix 1.
When you use the box averaging function, the operation is different. Moving average is
computed on a given number of data points, and the result is sampled and stored to the
acquisition memory.
Time
Time
1
2
32
40
a
41
Input signal
(At 20 MS/s)
Box averaged
data
b
• • • •
72
• • • •
• • •
VoltageVoltage
Sample Rate and Number of Moving Average Points
Sample Rate Number of Moving Average Points
500 MS/s 2 points every 2 points of 1 GS/s
200 MS/s 4 points every 4 points of 800 MS/s
100 MS/s 8 points every 8 points of 800 MS/s
50 MS/s 16 points every 16 points of 800 MS/s
20 MS/s 32 points every 40 points of 800 MS/s
10 MS/s 64 points every 80 points of 800 MS/s
5 MS/s 128 points every 160 points of 800 MS/s
2 MS/s 256 points every 400 points of 800 MS/s
1 MS/s 256 points every 800 points of 800 MS/s
500 kS/s or less 256 points every 1600* points of 800 MS/s
* The interval at which data is resampled varies depending on the sample rate. However, the
maximum number of data points that is box averaged is 256.
Possible Record Lengths
16 MW memory model (701460 and 701480)
4 MW or less (8 MW or less when in interleave mode)
4 MW memory model (701450 and 701470)
1 MW or less (2 MW or less when in interleave mode)
Possible Sample Rates
Sample rates can be set up to 500 MS/s regardless of the interleave mode setting (ON
or OFF). If the sample rate exceeds 500 MS/s regardless of the interleave mode setting
(ON or OFF), the acquisition mode is set to normal mode even when box average is
specified.
7.5 Setting the Acquisition Mode
To Next Page
Loading...
Need help?
General
