Low gate (LO GATE)
For most applications the low gate setting should be left at 1 second. Increase the low gate
setting to obtain a steadier rate display. The rate display updates in accordance with the
low gate setting. For example, if the low gate is set at 10, the display will update every 10
seconds. Changes in rate between updates will not be reflected until the next display
update.
High Gate (HI GATE)
Set the high gate value to correspond with 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.
6.6 Contact debounce filter (FILTER)
Use the filter function (FILTER) for applications where the meter is set up to count pulses
generated by switch contacts. There are three settings, HI (high speed), mEd (medium
speed), and LO (low speed). High speed disables the contact debounce filter and allows
any pulse of the minimum specified width for the input wired. Press ENTER when med or
LO is displayed to enable the filter function.
The medium filter ignores 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.
6.7
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.
6.8
Scaling and calibration (SCALCAL)
Important
It is very important to read the following information before proceeding to program the meter:
• There is no need to recalibrate the meter for frequency in Hz when first received from the
factory.
• The meter is factory calibrated for Hz prior to shipment. The calibration equipment is certified
to NIST standards.
Product advanced features
User manual 65
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