7.HOLD FUNCTIONS
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7-2. Hold Setting --- relative maximum and relative minimum ---
If you select the relative maximum and relative minimum hold in the hold function
setting, set the relative maximum and relative minimum value detection parameters
"minimum count" and "valley detection level".
Set referring to the principle of operation only when the value cannot be held
successfully with the factory settings or when further adjustments are required.
Detection of the relative maximum value and relative minimum value
The logic of detecting the relative maximum value and relative minimum value is given
below.
First, when difference X between point
A and point B is larger than the
minimum count, point A is judged to be
the relative maximum value and point B
is judged to be the relative minimum
value.
When difference X between detected
relative maximum value A and relative
minimum value B exceeds the
predetermined detection levels (1.5, 2,
and 3 times), A is displayed in the rela-
tive maximum value hold mode at
respective points O, P and Q and the
value is held.
If the minimum count is too small, when
the waveform includes noise as shown
on the left-hand side, the noise is
regarded as the relative maximum value
or relative minimum value and a correct
value may not be held. In such a case,
set the minimum count somewhat large.
A
B
O
P
Q
2X
X
1.5X
3X
True relative maximum
True relative minimum
Relative
A
X
B
minimum
Relative
maximum
