KEYENCE EX-V Series User Manual

Page 62

Chapter 4 Use of Data Processing Functions

Limited peak-to-peak hold function [b-2]

Measures the difference between the maximum and minimum values during a
specified period (sampling period).
For the limited peak-to-peak hold function, the sampling period can be specified
with the combination of the trigger mode and delay time settings.

➮ For the details of the trigger mode and delay time, refer to pages 53 to 55.

Timing diagram

■ External trigger mode

•

If a comparator output disable input turns ON before the comparator operation,
the comparator output does not turn ON.

➮ Refer to page 50 for details.

•

The sampling period is between the UP edge of the timing input (hold-reset
input) and the UP edge of the next timing input.

•

The value measured at the instant when the timing input turns ON is displayed/
output.

Reference: To clear the measured value being held and start the measurement
again, short-circuit the hold-reset and GND terminals.

Internal trigger mode (Example of internal trigger up )

•

If a comparator output disable input turns ON before the comparator operation,
the comparator output does not turn ON.

➮ Refer to page 50 for details.

•

The sampling operation starts when the sampling delay time elapses after the
measured value exceeds the trigger level. When the sampling period elapses,
the internal timing signal is turned ON and the "peak-to-peak value" is dis-
played/output.

•

The instant when the sampling starts, the strobe output turns ON.

•

Turning the strobe output from ON to OFF results in the off-delay of 2 ms for
updating the comparator output.

•

For the internal trigger down operation, the trigger point is the one when the
measured value falls below the trigger level.

•

The trigger level is factory-adjusted to the full scale.

Reference: To clear the measured value being held and to start the measurement
again, short-circuit the hold-reset and GND terminals.

(v)

(t)

OFF

(p-b)

(p'-b')

When the power is turned ON or the hold-reset
signal is input, the display shows " " until
the first measured value is determined.

Displayed value

Timing input

Limited peak-to-
peak value

Sampling period

(v)

(t)

OFF

(p-b)

(p'-b')

When the power is turned ON or the hold-reset signal is input,
the display shows " " until the first measured value is determined.

Displayed value

Internal data reset

Internal timing

Strobe output

Trigger
point

Limited peak-to-
peak value

Sampling
delay

Sampling period

Trigger level