KEYENCE EX-500(W) Series - Manual (Page 11)

11
FREE
LOCK
Auto-span function
Using the auto-span function, the ratio of the analog output
voltage relative to the measuring distance can be changed. This
function is useful to measure targets having a small diameter or
round surface because with these targets the input-to-output ratio
is variable or is linear only to a limited range. Be sure to calibrate
your sensor for the desired targets.
By pressing the auto-span key, the span (inclination) of the output
voltage is automatically changed and the output voltage is set to
2.5 V. (p.16)
■ Procedure
1. The auto-span function is activated only
when the mode selector switch is set to
"1" (MEASUREMENT mode).
2. Make sure that the lock switch is set to FREE (the upper
position).
3. Set the desired distance within the auto-span adjustment
range. Then press the auto-span key and check whether the
output voltage is set to 2.5 V.
AUTO-ZERO/AUTO-SPAN FUNCTIONS
■ Auto-span adjustment range
• The auto-span function can be activated within the range of 2
to 4 V.
(For current output, the auto-span adjustment range is 10.4 to
16.8 mA. )
• If the auto-span function cannot be activated, the OVER
indicator lights and the LED of the auto-span key flashes.
Press the auto-span key again to reset the alarm, and then re-
start the procedure described above.
Formula for auto-zero/auto-span
The following formula expresses the relationship between the
analog output value and the value just before the auto-zero/
auto-span function is activated.
Resetting the auto-zero/auto-span functions
Pressing the auto-zero/auto-span reset key (<1>) resets both
functions simultaneously (when the mode selector switch is set
to MEASUREMENT mode and the lock switch is set to FREE).
Analog output value = Span x (output value just before the auto-zero/
auto-span function is activated - Shift)
5 V
2.5 V
0 F.S.
Mode
Set desired distance
When current output is used .
the output current is set
to 12 mA.
Press the
< 2 > key.