Counter Meter Specifications

These instruments can handle a wide range of monitoring and control applications related to count, frequency, speed, flow rate, timing, totalizing, batching, or position.  There are specific counter meter models for

2135

Quadrature encoder input
(with optional rate measurement)

2140

Dual-channel counting, timing, and rate measurement, including

  • Up/down totalizing
  • Ratio and draw measurement
  • Time interval measurement and "stopwatch" operation
  • Phase angle and duty cycle measurement
  • Pulse-input batching

A high-stability crystal and digital calibration of all ranges eliminate the potentiometer-related drift that is found in most non-microcomputer-based meters.

Fast, Accurate Measurement

Every counter meter determines frequency by timing an integral number of periods over a programmable gate time, and then taking the inverse of the period.  This approach permits much greater accuracy and faster update than conventional rate meters, which count signal pulses over a specified time interval.

At the minimum gate time of 10 ms, an update rate as high as 25/second can be achieved.  Such fast response is ideal for peak capture and for alarm and control applications.  Variations in the displayed reading can be reduced by selecting a longer gate time.  An adaptive filter can further reduce variations due to noise while rapidly responding to actual changes in the input signal (see individual meters).  Rate in desired engineering units—such as liters per second—is obtained by multiplying the input by a scale factor.

Voltage-to-Frequency Counter

A special two-channel "V-to-F" meters is also available, for direct measurement and display of frequency (0 Hz to 2 MHz), rate (in engineering units), and period (inverse of frequency).  Each channel may be independently scaled for the desired parameter.  An "extended" version of V-to-F Meter provides additional functions, including simultaneous display of rate and total; various arithmetic operations involving the two inputs, including ratio (A/B) and "draw" (A/B-1); and linearization of nonlinear inputs.  Contact the factory for further information on both standard and optional functions of the V-to-F Counter Meter.

Counter Meter Specifications

A/D Conversion

Frequency Measurement Technique

Inverse period

Rate

Gate Time + 30 ms + 2 periods of the input signal (max.); for minimum gate time, this yields a rate of 25/s

Gate Time

Selectable 10 ms to 199.99 s

Zero Wait Time

Selectable 10 ms to 199.99 s

Scale Factor

±10-10 through ±106

Output and Display Update Rate

Same as conversion rate (above)

Digital Control Inputs (CMOS/TTL)*

Connections

Digital inputs and ground are received at the Power Connector (J1); selection of control functions is accomplished by internal jumper

Hold Input

Logic 0 holds display and outputs

Peak Input

Logic 0 displays peak value

External Gate Input

The gate time starts when the input goes low and ends when it goes high; when External Gate is selected, it overrides the internal gate

Reset Input

Logic 0 resets all meter functions

Function Reset Input

Logic 0 resets peak values and alarms

Decimal Point Input

Controls decimal-point position of displayed value; overrides internal decimal-point selections

 

* For modes of counter meter operation that allow display of multiple items, combinations of digital control inputs can be used to select "Item #1," "Item #2," or "Item #3" for display.

 

 
 
 

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