Omron ZX Series Operation Manual page 78

Reflective Sensor Heads: FUN M ode Functions
n Self-peak Hold
In Self-peak Hold Mode, measurements are performed while the mea-
sured value is larger than or equal to the self-trigger level, and the maxi-
mum value in the period will be the output value.
Hold Mode starts when the power is turned ON, immediately after chang-
ing to RUN or T Mode, or immediately after the reset input is turned OFF.
The output is head at the maximum output (current: approximately 23 mA,
voltage: approximately 5.5 V) until the first sampling period is finished. The
first measured result (A in the figure below) is output from the end of the
first sampling period to the end of the second sampling period. After the
second sampling period, the second measured result (B in the figure
below) is output and the sequence is repeated.
Current (mA)
23
Self-trigger
level
4
Hold Mode
Start
n Self-trigger Level
The self-trigger level is the threshold value for which measured value sam-
pling is performed. In Self-peak Hold Mode, sampling starts when the
measured value becomes larger than or equal to this value and sampling
ends when the measured value becomes smaller than or equal to this
value. The maximum value during this period is the hold value.
In Self-bottom Hold Mode, sampling starts when the measured value
becomes smaller than or equal to this value and sampling ends when the
measured value becomes larger than or equal to this value. The minimum
value during this period is the hold value.
Note: Hysteresis (hysteresis width) is applied to the self-trigger level. The hys-
teresis is generated when sampling ends (
58
The output is clamped on
the maximum value until
the first sampling period
is finished.
A
Sampling
Example: Self-peak Hold
Display value = Output value
Measured value
Outputs A.
Outputs B.
B
Sampling
±
3% FS).
Section 3-5
Time