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The Laureate™
dual-channel frequency
counter can measure AC line frequency to 50.0000 or 60.0000 Hz with
0.0001 Hz resolution in a few line cycles. It can measure 1000 Hz signals
with 0.01 Hz resolution at up to 25 readings per second. Such fast response
is ideal for alarm and control applications.
The Laureate frequency counter can display frequency from
0.005 Hz to 1 MHz, rate in engineering units, and period (inverse of
frequency). The normal displayed value can range up to 999,999 counts. Above that level,
the display will flash and go into four-digit XXXXEX scientific notation. Square root
extraction is standard. Each
channel (A or B) may be independently scaled for frequency, rate or period. The displayed
channel is selected via a front panel pushbutton.
The Laureate frequency counter determines frequency by
timing an integral number of periods over a specified gate time, and then
taking the inverse of period. Rate is obtained by multiplying the input by a
programmable scale factor. The inverse period approach allows greater
accuracy and faster update times than conventional meters which count signal
pulses over a specified time interval.
An Extended
frequency counter
version provides capabilities beyond those of the standard counter:
- Rate and total simultaneously. One
frequency counter channel can display total while the other displays rate. The selection for either channel
is via a front panel pushbutton. This mode is ideal for flow applications when the same
signal is applied to both channels.
- Linearization of nonlinear inputs. Exceptionally
accurate custom curve linearization capability allows linearization of the low end of
turbine flowmeters. The Extended frequency counter version allows linearized rates to be
totalized.
- Arithmetic functions. The
Extended frequency counter makes arithmetic functions available, namely A+B, A-B,
AxB, A/B and A/B-1
(draw). For example, A+B allows two input flows to be summed for total flow, while A-B
allows outflow to be subtracted from inflow for net flow. If transducers with a frequency
output are used, AxB allows horsepower to be displayed based measured torque and RPM, or
based on force and velocity. A/B can be used for the proper mixing of ingredients, while
A/B-1 (draw) is used to compare rates for stretching or tensioning.
For specifications and
additional operating modes of the Laurel frequency counter, please see:
Exceptional flexibility
is achieved for the Laureate frequency counter by programmable
features and up to 5 plug-in boards in addition to the main board. Please
see our Laureate product line overview.
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