Electrical measuring instruments >> digital panel meters


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    Voltmeter, milliammeter digital billboard F294-2
    Also, this device may be referred to: F 294-2, F-294-2, F2942, F 294 2.
    F294-2 voltmeter, digital milliammeter odnopredelny shield is designed to measure voltage and current in DC circuits.
    Dimensions - 80h160h250 mm.
    Accuracy class - 0.2 / 0.1.
    Weight - 1.8 kg.
    The basis of the instrument voltmeters, milliammeters F294-2 on the method of time-pulse conversion of two-stroke integrating the measured signal and reference voltage.
    Schematic diagram of the device is implemented on integrated circuits and semiconductor devices and placed on three printed circuit boards connected by bundles.
    The device is in a plastic case. Reading device performed on discharge indicators and a removable frame.
Specifications voltmeter, milliammeter F294-2:
Method of incorporating
Measurement limit
Quantization step
Input impedance
Accuracy class
20 uA
0,010 mA
0.2 / 0.1
With individual extension of 1 megohm
In 20
0.010 In
1 ± 0,01 MW
0.2 / 0.1
With individual series resistor 10 Mohm
10 ± 0,10 MW
0.2 / 0.1
    Warm-up time - no more than 30 minutes.
    Polarity selection - automatic.
    Time measurement with periodic startup - 40 ± 0,8 ms.
    Voltmeter reading device F294-2 provides an indication of the measurement result with the highest readings - 1999.
    Voltmeters, milliammeters provide external control switching indicator lights indicating device.
    In voltmeter, milliammeter provided access to the external connector:
    - The value of the measured signal in BCD 8-4-2-1;
    - Signal measurement cycle;
    - Sign of the polarity of the signal;
    - Signal reboot.
    Pulse output parameters:
    - Voltage range corresponding to a high level signal - from 2.4 to 5.25;
    - Voltage range corresponding to the low signal levels - from 0 to 0.5 V.
    The pulse duration of the signal measurement cycle - not less than 2 microseconds.
    F294-2 device provides periodic and ad hoc Mode.
    Run the instrument in a single measurement is performed remotely serving contact "External Trigger" connector periodic external trigger pulses with the following parameters:
    - Voltage range corresponding to a high level signal - from 2 to 5.25;
    - Voltage range corresponding to the low signal levels - from -0.4 V to 0.8 V;
    - Pulse - not less than 2 ms;
    - The time interval between the trigger pulse with a measuring time of 40 ms - 80.8 ms, with a measurement time of 80 ms - 161.6 ms, with a measuring time of 320 ms - 646.4 ms.
    Unlimited duration of continuous operation.
    MTBF considering maintenance - at least 18,000 hours
    Average life - 10 years.
    Operating conditions voltmeters Milliammeters F294-2:
    Mains voltage - 220 Hz ± 10%.
    Supply frequency - 50 Hz ± 1.
    Power consumption - 10 watts.
    Ambient temperature - from +5 ° C to +50 ° C.
    Relative humidity at +25 ° C - 90%.
    Voltmeters F294-2 equipped with individual additional resistance, which are designed as stand-alone units and are mounted on the back wall with the help of the top two screws.
    Fixation device to the panel or panels made ​​four screws located on the front panel.

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