Section 6: SCPI command reference
Model DMM7510 7½ Digit Graphical Sampling Multimeter Reference Manual
6-70
DMM7510-901-01 Rev. B / May 2015
Details
This command selects the type of averaging filter: Repeating average or moving average.
When the repeating average filter is selected, a set of measurements are made. These
measurements are stored in a measurement stack and averaged together to produce the averaged
sample. Once the averaged sample is produced, the stack is flushed and the next set of data is used
to produce the next averaged sample. This type of filter is the slowest, since the stack must be
completely filled before an averaged sample can be produced.
When the moving average filter is selected, the measurements are added to the stack continuously
on a first-in, first-out basis. As each measurement is made, the oldest measurement is removed from
the stack. A new averaged sample is produced using the new measurement and the data that is now
in the stack.
When the moving average filter is first selected, the stack is empty. When the first measurement is
made, it is copied into all the stack locations to fill the stack. A true average is not produced until the
stack is filled with new measurements. The size of the stack is determined by the filter count setting.
The repeating average filter produces slower results, but produces more stable results than the
moving average filter. For either method, the greater the number of measurements that are averaged,
the slower the averaged sample rate, but the lower the noise error. Trade-offs between speed and
noise are normally required to tailor the instrumentation to your measurement application.
Example 1
CURR:AVER:COUNT 10
CURR:AVER:TCON MOV
CURR:AVER ON
Set the averaging filter type to moving average,
with a filter count of 10.
Enable the averaging filter.
Example 2
RES:AVER:COUNT 10
RES:AVER:TCON MOV
RES:AVER ON
Set the averaging filter type to moving average,
with a filter count of 10.
Enable the averaging filter.
Example 3
VOLT:AVER:COUNT 10
VOLT:AVER:TCON MOV
VOLT:AVER ON
For voltage measurements, set the averaging
filter type to moving average, with a filter count
of 10.
Enable the averaging filter.
Also see
(on page 3-11)
[:SENSe[1]]:<function>:AVERage:COUNt
(on page 6-67)
[:SENSe[1]]:<function>:AVERage[:STATe]
(on page 6-68)
