Weidmuller PTX800D - Scalable pulse and frequency counter - Manual (Page 6)

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Input signal type
Sets the input trigger and reset levels to suit the pulse source. The
table below gives the threshold values.
For contact closure inputs, the software incorporates debouncing
(minimum pulse width 0 mS / maximum frequency 10 Hz).
Input type
Low voltage inputs High voltage inputs
Description
Trigger Reset Trigger Reset
LOAC 50 mV -50 mV 200 mV -400 mV Low level AC signals
HIAC 2.5 V -2.5 V 14 V -10 V High level AC signals
LOdC 3.5 V 0.5 V 20 V -2 V Low level DC signals
HIdC 6 V 3 V 35 V 10 V High level DC signals
CoN 6 V 3 V 35 V 10 V Contact closure
Pulse rate
Set the pulse rate to low if the maximum input frequency is below
1 kHz. Otherwise it should be set to high.
Pulse scaling factor
Sets the number of pulses received for a unit change in the total. So, if
you have a flowmeter that gives four pulses per litre, you can show the
total in litres by setting the pulse scaling factor to four, or in kilolitres by
setting the pulse scaling factor to four thousand. You can not set it to
more than 10 000 display digits (i.e., ignoring the decimal point).
Total decimal point
The total decimal point position sets the number of decimal places for
the total display. Totals are displayed using the full eight digits.
Rate decimal point
Sets the number of decimal places for the rate display. Rates are
displayed as five digit numbers.