53
7
EXPLANATION OF HOLD FUNCTIONS
53
EX
PLANATION OF HOLD FUNCTIONS
Chapter
7
■
Average hold
The average of the sampling values over the specified section is calculated and updated, and then
held.
The section is specified by the setting of "all section," "external signal," or "external time."
(Example) Externally specified section average value hold
t1: A delay time between the instant
when the SECTION signal is inputted
and the instant when the value to be held
is detected
Approximately 0.7ms
（
MAX.
）
t2: A delay time between the instant
when the SECTION signal is released
and the instant when the value to be held
is determined
Approximately 0.7ms
（
MAX.
）
t3: A minimum reset signal width
required for releasing the hold
Approximately 0.7ms
（
MIN.
）
The delay time and signal width
expressed apply when the A/D
conversion speed is 3000 times/sec.
They become 10-times when the A/D
conversion speed is 300 times/sec.
The detection section is limited by the maximum average value detection time set according to the
"average sample number." If the maximum average value detection time is exceeded, detection is
automatically terminated, and the average value of that time is held.
■
Average sample number
In the average hold, the maximum average value detection time for average processing by each
sampling depends on the A/D conversion speed as follows:
When the A/D conversion speed is 300 times/sec:
50sec.
When the A/D conversion speed is 3000 times/sec: 5sec.
Then, if this average sample number is set at 2 or more, the sampling data used for average
calculation becomes the representative value of the sampling values of the set number (average
obtained according to the number). By this setting, the average value detection time can be
elongated, but error causes by average calculation increase.
Example) When the A/D conversion speed is 3000 times/sec,
Maximum average value detection time = Average sample number × 10 sec.,
and also the number of average updates will decrease.
Number of average updates = 3000 times/sec. ÷ Average sample number
≪
Setting value
≫
1
～
999
[times]
Internal calculated value
Hold Value
t
＋
T/H
Limit Judging
H/E
Fixed
SECTION
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Undetermind
t1
t2
t3
Detection
Hold Section
OFF
ON
HOLD
Button
HI-LO
HOLD
Status Display
PEAK
Status Display
ON
Blink
ON
OFF
ON
OFF
OFF
OFF
Section (Note)
Output
Summary of Contents for F350
Page 1: ...01MAR2015REV 1 04 F350 OPERATION MANUAL ...
Page 115: ......
