57
7
EXPLANATION OF HOLD FUNCTIONS
57
EX
PLANATION OF HOLD FUNCTIONS
Chapter
7
■
External time
By this method, the hold detection section is specified as a timer. Detection starts with the
SECTION signal ON, and ends when the set time (detection time) has elapsed.
The hold value is maintained until the hold reset signal is turned on.
The hold is released by turning on the T/H signal as a reset signal.
There are tracking sections, detection sections, and hold deciding sections.
(Example) External Time specified section peak hold
t1: A minimum SECTION signal width
required for beginning detection
Approximately 0.7ms
(
MIN.
)
t2: A delay time between the instant
when the detection time is ended 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.
By turning on the SECTION signal again without turning on the T/H signal while the hold is
fixed, the hold is released and re-detection is started.
For details, see "7-4.Auto reset function" on page 58.
■
Detection time
Set the hold detection time.
《
Setting value
》
0.01
~
9.99 [sec.]
◇
Detection time setting method
1.
Select setting mode 1.
Press
once.
2.
Set "Detection time."
Press
five times
⇒
"Detection time" is displayed.
Press
, and the highest digit blinks.
Move to the lower digits with
.
(
Initial value
:
1
)
Input the setting value with
.
Press
to validate it.
3.
Press
twice to go back to the indicated value display.
Indicated value
t3
Internal calculatde value
Detection
t
+
HI-LO Limit
Judging Output
H/E
Hold Section
t2
t1
Fixed
SECTION
T/H
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
Blink
ON
OFF
ON
OFF
OFF
OFF
HOLD
Button
Detection time
HOLD
Status Display
PEAK
Status Display
Ch1 Ch
2
H I
LO
H I
LO
FNC
H I
Ch1 Ch
2
OK
LO
PEAK
HOLD
H I
LO
H I
LO
ESC
Summary of Contents for F350
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