Compensating Forced-Zero References - Omron K3HB-H User Manual

Section 5 Functions and Operations

5.27 Compensating Forced-zero References

The zero-trimming function compensates the forced-zero shift value based on the measurement value for
an OK object (PASS data) while forced-zero is being executed.
This function can be used if the timing hold setting is set to sampling hold, peak hold, or bottom hold.
Explanation of Functions
The zero-trimming algorithm is shown below.
Application Example: Absorbing temperature drift for linear sensors
The reference device is measured using the linear sensor and forced-zero is executed first thing in the
morning, when the room temperature is low. While workpieces are subsequently being measured, the
room temperature gradually increases and the measurement values gradually change due to the
temperature characteristics of the linear sensor.
These kinds of gradual changes can be compensated for by using the zero-trimming function.
f
z-trm
L
(Z-TRM)
5-70
Zero-trimming
Calculates measurement value A.
Forced zero value: ZRn
DispLay value: D = A-ZRn
Comparative
judgement
PASS=ON
Forced zero value correction
ZRn+1 = ZRn + (1- )
: Previous zeroed weight (= 0.9)
Zero-trimming is set using the following parameter.
Parameter
Zero-trimming
z-trm
Advanced function setting level
PASS=OFF
A
Set value Meaning of set value
on
Zero-trimming ON
off
Zero-trimming OFF
X V S