KEYENCE LK-3100 - Manual (Page 12)

12
This section describes each function to help you make effective use of
the LK-3100 series.
AUTO ZERO function
Resets the output voltage to 0 V at the desired point within the measur-
ing range.
Changing the zero position enables the output range to be set at either
-10 to 0 V, or 0 to 10 V.
Canceling AUTO ZERO:
Press the
ZERO
RESET
key for approximately 2 seconds. AUTO ZERO is canceled
and 0 V (12 mA) is output when the target is at the reference position.
External terminal input:
Short-circuiting the external AUTO ZERO input terminal and the GND
terminal also sets the AUTO ZERO input.
USING EACH FUNCTION AUTO ZERO
Relationship between the key-lock function and AUTO
ZERO function
➮ Refer to p.15 for the key-lock function.
When FREE is set:
The value of the AUTO ZERO input is internally stored and retained
even the power is turned off.
When LOCK is set:
The AUTO ZERO input is available only from the external input terminal.
When the power is turned off, the value of the AUTO ZERO input is not
stored, and the zero point is reset to the reference position. However,
once a value is stored as zero during the FREE setting, the value is
retained even if LOCK is set and the power is turned off.
Note: If the AUTO ZERO input is used frequently, set the key-lock
function to LOCK, and set the AUTO ZERO externally.
AUTO ZERO position and output characteristics
Note: When the AUTO ZERO input is turned ON, there may be some
errors due to the temperature characteristics of the internal circuit
9 mm
V
9 mm
(4 mA) (12 mA)
ZERO
RESET
V
9 10
0 11
-10
10
Output
voltage (V)
When AUTO
ZERO is set
at 9 mm.
When AUTO
ZERO is set
at 11 mm.
Distance (mm)