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    Digital Counter, 6 Digit, Frequency/Rev/Speed

    5 out of 5 based on 3 reviews | Write a review
    Digital counter is suitable for measuring the frequency, rotational speed, linear speed and flow of various types of control equipment. 6 digit counters can be customized as special test instrumentation for pulse width detection, duty ratio detection, etc.
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    Delivery date: 6-12 days

    Digital counter has 6 digit display, frequency/rev/linear speed measuring function, DC 12V/24V external power supply.


    • Various parameter settings, simple operation.
    • Input: Various waveform pulses (square wave, triangle wave), proximity sensor, photoelectric sensor, voltage signal, contact switch, encoder, etc.
    • Digital counter can also be used to measure the power frequency (AC 0-600V), measurement range: 0.01Hz-100KHz, resolution: 0.01Hz.
    • 6 digit display, decimal point automatic conversion.
    • Input/output signals photoelectric isolated, anti-interference ability.
    • Digital output: Up to 3 alarms, high value, low value, high and low value alarm modes are optional, analog output: 4-20mA or 0-10V transmission output, measuring range setting arbitrarily.
    • Standard RS232 or RS485 MODBUS RTU communication, can be directly connected with computers, PLC or other equipments.


    Mode ATO-DIGC-FA6
    Weight 350g
    Accuracy 0.1%±2 digit
    Power supply AC 220V/110V±15%, AC 90-260V, DC 24V±10%, power dissipation≤5VA
    Input signal Pulse signal, square wave, sine wave, 5V≤H≤30V, 0≤L≤2V, rising edge trigger, frequency: 0.01~10KHz, 1Hz-100KHz
    Display counting range -199999~999999
    Input impedance ≥10KΩ
    Transmission output 4-20mA, 0-10V, etc. (range can be set)
    Insulation resistance ≥100MΩ (between DC 500V power terminal and external terminal)
    Dielectric strength AC 1500V 1min (between power terminal and external terminal)
    Environment Ambient temperature: 0~50°C, relative humidity: 35~85%RH
    External power supply DC 12V±5%, 50mA max / DC 24V±5%, 30mA max
    Protection class IP65

    Selection table:

    Dimension (length*height*depth) Power supply AL1 AL2 Communication interface External power supply
    7: 72*72*80mm with hole size 67.5*67.5mm;
    8: 96*48*80mm with hole size 92*45mm
    V0: AC 90-260V;
    VE: AC/DC 12-30V, or DC 24V
    N: No output;
    R: Relay;
    N: No output;
    R: Relay;
    C0: No communication;
    C2: RS232;
    C4: RS485
    A: DC 12V/30mA;
    B: DC 24V/30mA;
    C: DC 5V

    Wiring diagram:
    Digital counter wiring diagram
    Tips: Error of digital counter

    1. Quantization error
      In the digital measurement of frequency, the measured quantity is not exactly an integral multiple of the standard unit. So there is a part of the time not counted in the quantization process cause the error. Besides, the gate opening and closing time are out of sync (random) with measured signals, which will cause plus or minus error of digital counter.
    2. Trigger error
      Under the influences of interference signal, the gating pulse let the triggering advanced or lagged, and then trigger error is caused.
    3. Standard frequency error
      Under the influences of the external environment or its own structural performance and other factors, the standard frequency (such as the crystal oscillator) adopted by digital counter will produce drift, and then standard frequency error is introduced.

    In this video, ATO will show you how to wire a digital counter. And how to set the basic parameters of digital counter.

    Existing reviews of Digital Counter, 6 Digit, Frequency/Rev/Speed
    Digital counter work with turbine flow sensor
    Please let me know if the digital counter can be used with an NPN  turbine flow sensor with a pulse rate/K factor of 119 pulse/liter -
    8.40 ml/pulse.
    From: roze | Date: 25/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The digital counter can be used with an NPN pulse signal.
    But we also want to know what function the digital counter achieves by receiving the pulse signal.
    Do you need to display the count value or the pulse frequency?
    I am looking for a 6 digit digital counter
    I am looking for information on how I would use your photoelectric sensor and digital counter to stop a vfd when it hits a predetermined count. Is there a support forum for this scenario?
    From: Bowden | Date: 16/12/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, simply, when ordering the counter, select the output relay option from pull down menus.
    Our VFD has multi-function terminals X1, X2. So just connect output relay terminals to VFD "X1 & COM" and define XI as free stop, so can stop VFD when the counter hits a predetermined count as pre-programmed.
    Good 6 digit digital counter
    I am interested in your 6 digit digital counter. However I need to know if it comes with a sensor for input. It is intended to couple it with wheel to count predetermined revolutions and automatically stop the revolving wheel when the value is reached.
    From: Jbindc | Date: 06/05/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Our counter (ATO-DIGC-FH6) should be connected with one of our (photoelectric switch or proximity switch), which can count the number of wheel revolutions and when reachs the preset number of turns, it outputs a signal.
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