Rion VA-12 User Manual

71
Measurement in FFT Mode
Performing measurement
The operation principles for measurement in FFT mode are explained in
this section.
For information on measurement using the trigger functions, see the “Trigger
Functions” section.
Operation type overview
The chart below shows an outline of the various operation types.
The meaning of the [Average number] (N in the above diagram) set in the
[FFT] menu differs, depending on whether exponential averaging or linear
averaging (or maximum hold) is selected.
Y
k
: k-th average value
X
k
: k-th instantaneous value
N: Preset average number
(A): Processing standby
START/STOP
key
START/STOP
key
START/STOP
key
X
k
X
k+3
X
k+2
X
k+1
Y
1
Y
N
Y
2
X
l
X
l+3
X
l+2
X
l+1
X
m
X
m+3
X
m+2
X
m+1
Y
N+1
Y
r
Y
1
Y
N
Y
2
Y
1
Y
N
Y
2
Y
N+1
Y
1
Y
N
Y
2
Y
1
Y
N
Y
2
Y
1
Y
N
Y
2
Y
1
Y
N
Y
2
Y
1
Y
N
Y
2
k = 1, 2, ......, r, ......
Y
k
=
(N-1)Y
k-1
+X
k
N
k = 1, 2, ......, N
Y
k
=
k
X
i
i =1
k
Operation
type
Instanta-
neous value
Exponential
averaging
Linear
averaging
Maximum
hold
Exponential
averaging
Linear
averaging
Processing stop
Processing
standby
Processing
standby
Processing complete Processing complete
Processing complete Processing complete
Processing complete
Processing complete
(A)
(A)
(A)
(A)
(A)
(A)
(A)
Maximum hold
Maximum value of Y
k
= X
1
to X
k

Rion VA-12 Specifications

General

Brand	Rion
Model	VA-12
Category	Measuring Instruments
Language	English