Precision Digital PD6830 - Manual (Page 65)

PD6830 Pulse Input Rate/Totalizer Instruction Manual
65
Gate Function (GATE)
The gate function is used for displaying slow pulse rates. Using the programmable
gate, the meter is able to display pulse rates as slow as 1 pulse every 9,999 seconds
(0.0001 Hz). The gate function can also be used to obtain a steady display reading
with a fluctuating input signal.
There are two settings for the Gate, low gate (LO) and high gate (HI).
Low Gate (LO GaTe)
For most applications, low gate setting should be left at 1 second. Increase low gate
setting to obtain a steadier rate display. The rate display will update in accordance
with the low gate setting, for example if low gate is set at 10, the display will update
every 10 seconds; changes in rate between updates will not be reflected until next
display update.
High Gate (HI GaTE)
Set the high gate value to correspond to the highest expected pulse period (lowest
pulse rate). For instance if the meter must display a rate when there is 1 pulse
coming into the meter every 10 seconds, set the high gate to 11 seconds. When the
signal is removed from the meter, the display will show the last reading for 11
seconds; then it will read zero.
Contact Debounce Filter (FILTER)
The filter function (FILTER) can be used for applications where the meter is set up to
count pulses generated by switch contacts. There are three settings, HI (high speed),
nmed
(medium speed), and LO (low speed). High speed disables the contact de-
bounce filter and allows any pulse of the minimum specified width for the selected in-
put type. Press ENTER when nmeD or LO is displayed to enable the filter function.
The medium filter ignored signals faster than 250 Hz max, or pulse widths less than 2
ms at 50% duty cycle. The low filter ignores signals higher than 100 Hz, or pulse
widths less than 5 ms at 50% duty cycle.
Low-Flow Cutoff (CUTOFF)
The low-flow cutoff feature allows the meter to be programmed so that the often-
unsteady output from a transmitter at low flow rates, always displays zero on the
meter.
The cutoff value may be programmed from 0 to 9999.9. Below the cutoff value, the
meter will display zero. Programming the cutoff value to zero disables the cutoff
feature.