External Signal - Unipulse F350 Operation Manual

7 EXPLANATION OF HOLD FUNCTIONS

■External signal

Chapter
7
56
56
By this method, the hold detection section is specified by the SECTION signal.
Detection starts with the SECTION signal ON, and ends with the SECTION signal OFF to perform
each hold operation.
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.
tant when the T/H signal is turned on.
(Example) Externally specified section peak hold
＋
Indicated value
Detection
t1
OFF
SECTION
ON
OFF
HOLD
Button
ON
OFF
T/H
ON
OFF
HI-LO Limit
Judging Output
ON
OFF
H/E
ON
HOLD OFF ON
Status Display
PEAK OFF Blink
Status Display
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.
Internal calculated
value
Hold Section
t
t2
t3
Fixed
ON OFF
ON OFF
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
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
A/D